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<h3>
Simon Peyton Jones pushed to branch wip/T17656
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4f85f14177d0b2be1c1489bc69ad4f69372e1fb4">4f85f141</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-12-18T09:44:46+00:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Kill floatEqualities completely
This patch delivers on #17656, by entirel killing off the complex
floatEqualities mechanism. Previously, floatEqualities would float an
equality out of an implication, so that it could be solved at an outer
level. But now we simply do unification in-place, without floating the
constraint, relying on level numbers to determine untouchability.
There are a number of important new Notes:
* GHC.Tc.Utils.Unify Note [Unification preconditions]
describes the preconditions for unification, including both
skolem-escape and touchability.
* GHC.Tc.Solver.Interact Note [Solve by unification]
describes what we do when we do unify
* GHC.Tc.Solver.Monad Note [The Unification Level Flag]
describes how we control solver iteration under this new scheme
* GHC.Tc.Solver.Monad Note [Tracking Given equalities]
describes how we track when we have Given equalities
* GHC.Tc.Types.Constraint Note [HasGivenEqs]
is a new explanation of the ic_given_eqs field of an implication
A big raft of subtle Notes in Solver, concerning floatEqualities,
disappears.
Main code changes:
* GHC.Tc.Solver.floatEqualities disappears entirely
* GHC.Tc.Solver.Monad: new fields in InertCans, inert_given_eq_lvl
and inert_given_eq, updated by updateGivenEqs
See Note [Tracking Given equalities].
* In exchange for updateGivenEqa, GHC.Tc.Solver.Monad.getHasGivenEqs
is much simpler and more efficient
* I found I could kill of metaTyVarUpdateOK entirely
One test case T14683 showed a 5.1% decrease in compile-time
allocation; and T5631 was down 2.2%. Other changes were small.
Metric Decrease:
T14683
T5631
</pre>
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<h4>20 changed files:</h4>
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<li class="file-stats">
<a href="#8858278b4cb7284f96b29b5564bcb426de4fae70">
compiler/GHC/Runtime/Heap/Inspect.hs
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<li class="file-stats">
<a href="#e4b9d5e9d2de37561bfd06a2c97a5c924a1bab76">
compiler/GHC/Tc/Errors.hs
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<li class="file-stats">
<a href="#6a1f039ed7725eddef15dd5f4dc318a3434f26c9">
compiler/GHC/Tc/Gen/App.hs
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<li class="file-stats">
<a href="#9355bef855426caf5f526925edf351b20f9a86c4">
compiler/GHC/Tc/Gen/HsType.hs
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<li class="file-stats">
<a href="#54436e21ea530a66a8a71bcc01c836f4740b8f02">
compiler/GHC/Tc/Solver.hs
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<li class="file-stats">
<a href="#f018e77421f495c6f75733fee4a511cfe57bebe8">
compiler/GHC/Tc/Solver/Canonical.hs
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<li class="file-stats">
<a href="#f639b0b31b7245cb7d34ac190b798f5ec1c7da2e">
compiler/GHC/Tc/Solver/Interact.hs
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<li class="file-stats">
<a href="#0c6b585a8a21f8340a85ca2cef89c4b1bf5a8953">
compiler/GHC/Tc/Solver/Monad.hs
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<a href="#3b6d78a50c8462304f843b952a88e531718dbbd2">
compiler/GHC/Tc/Types/Constraint.hs
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<a href="#f021c52a6ccf306e88c9f760b2aee33b180ba341">
compiler/GHC/Tc/Utils/Env.hs
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<a href="#c6e4263ee64c68e57b7525127d98243fce38b1ea">
compiler/GHC/Tc/Utils/Monad.hs
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<a href="#94c96afe1bb3b771ffbcfeeca34ce43ebbe76ccb">
compiler/GHC/Tc/Utils/TcMType.hs
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<li class="file-stats">
<a href="#5461e7beeb7ae73d7c01f720cbaa3fa2c5333590">
compiler/GHC/Tc/Utils/TcType.hs
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<li class="file-stats">
<a href="#74295edeac870ee7f2f3484ebaffab5c948b735a">
compiler/GHC/Tc/Utils/Unify.hs
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<li class="file-stats">
<a href="#be3176dd680b038f442161581e992924140d0404">
testsuite/tests/ghci.debugger/scripts/break012.stdout
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<a href="#fdad8ca739f3d61752da4e6fec4e8e7e5604fb9a">
testsuite/tests/partial-sigs/should_compile/T10403.stderr
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<a href="#1fd9911bd422ea4464eced9af36c9431a3d05a83">
testsuite/tests/partial-sigs/should_compile/T14715.stderr
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<a href="#d9b84a6a85857ca6c1c54a44783355ad60647fa0">
testsuite/tests/partial-sigs/should_fail/ScopedNamedWildcardsBad.stderr
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<a href="#d67673f1f07a2cd7b42addb9d5e4bdb29f7a7002">
testsuite/tests/typecheck/should_fail/ExpandSynsFail2.stderr
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<li class="file-stats">
<a href="#1ebf0c75765ea8946e5ea0a914d6d48df2f66b33">
testsuite/tests/typecheck/should_fail/T7453.stderr
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<h4>Changes:</h4>
<li id="8858278b4cb7284f96b29b5564bcb426de4fae70">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4f85f14177d0b2be1c1489bc69ad4f69372e1fb4#8858278b4cb7284f96b29b5564bcb426de4fae70"><strong>compiler/GHC/Runtime/Heap/Inspect.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -577,7 +577,7 @@ newOpenVar = liftTcM (do { kind <- newOpenTypeKind</td>
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577
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577
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<pre style="margin: 0;"> <span id="LC577" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~</span></span>
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578
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578
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<pre style="margin: 0;"> <span id="LC578" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In the GHCi debugger we use unification variables whose MetaInfo is</span></span>
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579
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579
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<pre style="margin: 0;"> <span id="LC579" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">RuntimeUnkTv. The special property of a RuntimeUnkTv is that it can</span></span>
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580
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<pre style="margin: 0;">-<span id="LC580" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">unify with a polytype (see GHC.Tc.Utils.Unify.<span class="idiff left right">metaTyVarUpdateOK</span>).</span></span>
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580
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<pre style="margin: 0;">+<span id="LC580" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">unify with a polytype (see GHC.Tc.Utils.Unify.<span class="idiff left right">checkTypeEq</span>).</span></span>
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581
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581
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<pre style="margin: 0;"> <span id="LC581" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If we don't do this `:print <term>` will fail if the type of <term></span></span>
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<td class="diff-line-num old_line" data-linenumber="582" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
582
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582
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<pre style="margin: 0;"> <span id="LC582" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">has nested `forall`s or `=>`s.</span></span>
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583
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583
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<pre style="margin: 0;"> <span id="LC583" class="line" lang="haskell"></span>
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<li id="e4b9d5e9d2de37561bfd06a2c97a5c924a1bab76">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4f85f14177d0b2be1c1489bc69ad4f69372e1fb4#e4b9d5e9d2de37561bfd06a2c97a5c924a1bab76"><strong>compiler/GHC/Tc/Errors.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="21" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -21,7 +21,7 @@ import GHC.Tc.Utils.Monad</td>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types.Constraint</span></span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Predicate</span></span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.TcMType</span></span>
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<pre style="margin: 0;">-<span id="LC24" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Unify</span><span class="p">(</span> <span class="n" style="color: #333;">occCheckForErrors</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">MetaTyVarUpdate</span>Result</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Unify</span><span class="p">(</span> <span class="n" style="color: #333;">occCheckForErrors</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CheckTyEq</span>Result</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Env</span><span class="p">(</span> <span class="n" style="color: #333;">tcInitTidyEnv</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.TcType</span></span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types.Origin</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1482,7 +1482,7 @@ mkTyVarEqErr' dflags ctxt report ct tv1 ty2</td>
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1482
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<pre style="margin: 0;"> <span id="LC1482" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">report</span></span>
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1483
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<pre style="margin: 0;"> <span id="LC1483" class="line" lang="haskell"> <span class="p">]</span></span>
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1484
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<pre style="margin: 0;"> <span id="LC1484" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1485" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">MTVU</span>_Occurs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">occ_check_expand</span></span>
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<pre style="margin: 0;">+<span id="LC1485" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CTE</span>_Occurs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">occ_check_expand</span></span>
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<pre style="margin: 0;"> <span id="LC1486" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We report an "occurs check" even for a ~ F t a, where F is a type</span></span>
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<pre style="margin: 0;"> <span id="LC1487" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- function; it's not insoluble (because in principle F could reduce)</span></span>
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<pre style="margin: 0;"> <span id="LC1488" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- but we have certainly been unable to solve it</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1503,7 +1503,7 @@ mkTyVarEqErr' dflags ctxt report ct tv1 ty2</td>
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<pre style="margin: 0;"> <span id="LC1503" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mkErrorMsgFromCt</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">ct</span> <span class="o" style="font-weight: 600;">$</span></span>
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1504
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<pre style="margin: 0;"> <span id="LC1504" class="line" lang="haskell"> <span class="n" style="color: #333;">mconcat</span> <span class="p">[</span><span class="n" style="color: #333;">headline_msg</span><span class="p">,</span> <span class="n" style="color: #333;">extra2</span><span class="p">,</span> <span class="n" style="color: #333;">extra3</span><span class="p">,</span> <span class="n" style="color: #333;">report</span><span class="p">]</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1505" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1506" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">MTVU</span>_Bad</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">occ_check_expand</span></span>
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<pre style="margin: 0;">+<span id="LC1506" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CTE</span>_Bad</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">occ_check_expand</span></span>
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<pre style="margin: 0;"> <span id="LC1507" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">msg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Cannot instantiate unification variable"</span></span>
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<pre style="margin: 0;"> <span id="LC1508" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tv1</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1509" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"with a"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">what</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"involving polytypes:"</span><span class="p">)</span> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span> <span class="p">]</span></span>
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<li id="6a1f039ed7725eddef15dd5f4dc318a3434f26c9">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4f85f14177d0b2be1c1489bc69ad4f69372e1fb4#6a1f039ed7725eddef15dd5f4dc318a3434f26c9"><strong>compiler/GHC/Tc/Gen/App.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -907,7 +907,7 @@ That is the entire point of qlUnify! Wrinkles:</td>
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<pre style="margin: 0;"> <span id="LC907" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC908" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* We must not make an occurs-check; we use occCheckExpand for that.</span></span>
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<pre style="margin: 0;"> <span id="LC909" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC910" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* <span class="idiff left right">metaTyVarUpdateOK</span> also checks for various other things, including</span></span>
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<pre style="margin: 0;">+<span id="LC910" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* <span class="idiff left right">checkTypeEq</span> also checks for various other things, including</span></span>
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<pre style="margin: 0;"> <span id="LC911" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - foralls, and predicate types (which we want to allow here)</span></span>
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<pre style="margin: 0;"> <span id="LC912" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - type families (relates to a very specific and exotic performance</span></span>
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<pre style="margin: 0;"> <span id="LC913" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> question, that is unlikely to bite here)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4f85f14177d0b2be1c1489bc69ad4f69372e1fb4#9355bef855426caf5f526925edf351b20f9a86c4"><strong>compiler/GHC/Tc/Gen/HsType.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -312,7 +312,7 @@ Note [Promotion in signatures]</td>
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<pre style="margin: 0;"> <span id="LC312" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If an unsolved metavariable in a signature is not generalized</span></span>
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<pre style="margin: 0;"> <span id="LC313" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(because we're not generalizing the construct -- e.g., pattern</span></span>
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<pre style="margin: 0;"> <span id="LC314" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">sig -- or because the metavars are constrained -- see kindGeneralizeSome)</span></span>
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<pre style="margin: 0;">-<span id="LC315" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we need to promote to maintain (WantedTvInv) of Note [TcLevel <span class="idiff left right">and untouchable type variable</span>s]</span></span>
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<pre style="margin: 0;">+<span id="LC315" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we need to promote to maintain (WantedTvInv) of Note [TcLevel <span class="idiff left right">invariant</span>s]</span></span>
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<pre style="margin: 0;"> <span id="LC316" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in GHC.Tc.Utils.TcType. Note that promotion is identical in effect to generalizing</span></span>
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<pre style="margin: 0;"> <span id="LC317" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and the reinstantiating with a fresh metavariable at the current level.</span></span>
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<pre style="margin: 0;"> <span id="LC318" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So in some sense, we generalize *all* variables, but then re-instantiate</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -330,7 +330,7 @@ the pattern signature (which is not kind-generalized). When we are checking</td>
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<pre style="margin: 0;"> <span id="LC330" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the *body* of foo, though, we need to unify the type of x with the argument</span></span>
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<pre style="margin: 0;"> <span id="LC331" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">type of bar. At this point, the ambient TcLevel is 1, and spotting a</span></span>
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<pre style="margin: 0;"> <span id="LC332" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">matavariable with level 2 would violate the (WantedTvInv) invariant of</span></span>
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<pre style="margin: 0;">-<span id="LC333" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [TcLevel <span class="idiff left right">and untouchable type variable</span>s]. So, instead of kind-generalizing,</span></span>
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<pre style="margin: 0;">+<span id="LC333" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [TcLevel <span class="idiff left right">invariant</span>s]. So, instead of kind-generalizing,</span></span>
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<pre style="margin: 0;"> <span id="LC334" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we promote the metavariable to level 1. This is all done in kindGeneralizeNone.</span></span>
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335
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<pre style="margin: 0;"> <span id="LC335" class="line" lang="haskell"></span>
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336
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<pre style="margin: 0;"> <span id="LC336" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<li id="54436e21ea530a66a8a71bcc01c836f4740b8f02">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4f85f14177d0b2be1c1489bc69ad4f69372e1fb4#54436e21ea530a66a8a71bcc01c836f4740b8f02"><strong>compiler/GHC/Tc/Solver.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -264,7 +264,7 @@ floatKindEqualities wc = float_wc emptyVarSet wc</td>
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264
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<pre style="margin: 0;"> <span id="LC264" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="c1" style="color: #998; font-style: italic;">-- A short cut /plus/ we must keep track of IC_BadTelescope</span></span>
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265
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265
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<pre style="margin: 0;"> <span id="LC265" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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266
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266
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<pre style="margin: 0;"> <span id="LC266" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">simples</span><span class="p">,</span> <span class="n" style="color: #333;">holes</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">float_wc</span> <span class="n" style="color: #333;">new_trapping_tvs</span> <span class="n" style="color: #333;">wanted</span></span>
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267
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<pre style="margin: 0;">-<span id="LC267" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isEmptyBag</span> <span class="n" style="color: #333;">simples</span><span class="p">)</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">given_eqs</span> <span class="o" style="font-weight: 600;"><span class="idiff left">/=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">No</span>GivenEqs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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267
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<pre style="margin: 0;">+<span id="LC267" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isEmptyBag</span> <span class="n" style="color: #333;">simples</span><span class="p">)</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">given_eqs</span> <span class="o" style="font-weight: 600;"><span class="idiff left">==</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Maybe</span>GivenEqs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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268
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268
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<pre style="margin: 0;"> <span id="LC268" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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269
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269
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<pre style="margin: 0;"> <span id="LC269" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If there are some constraints to float out, but we can't</span></span>
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270
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270
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<pre style="margin: 0;"> <span id="LC270" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- because we don't float out past local equalities</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1282,7 +1282,8 @@ decideMonoTyVars infer_mode name_taus psigs candidates</td>
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1282
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1282
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<pre style="margin: 0;"> <span id="LC1282" class="line" lang="haskell"> <span class="n" style="color: #333;">mr_msg</span></span>
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1283
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1283
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<pre style="margin: 0;"> <span id="LC1283" class="line" lang="haskell"></span>
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1284
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1284
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<pre style="margin: 0;"> <span id="LC1284" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"decideMonoTyVars"</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">vcat</span></span>
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1285
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<pre style="margin: 0;">-<span id="LC1285" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"mono_tvs0 ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">mono_tvs0</span></span>
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1285
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<pre style="margin: 0;">+<span id="LC1285" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"infer_mode ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">infer_mode</span></span>
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1286
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<pre style="margin: 0;">+<span id="LC1286" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"mono_tvs0 ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">mono_tvs0</span></span>
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1286
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1287
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<pre style="margin: 0;"> <span id="LC1287" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"no_quant ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">no_quant</span></span>
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1287
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1288
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<pre style="margin: 0;"> <span id="LC1288" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"maybe_quant ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">maybe_quant</span></span>
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1288
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1289
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<pre style="margin: 0;"> <span id="LC1289" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"eq_constraints ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">eq_constraints</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1325,7 +1326,7 @@ defaultTyVarsAndSimplify :: TcLevel</td>
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<pre style="margin: 0;"> <span id="LC1326" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- and re-simplify in case the defaulting allows further simplification</span></span>
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<pre style="margin: 0;"> <span id="LC1327" class="line" lang="haskell"><span class="n" style="color: #333;">defaultTyVarsAndSimplify</span> <span class="n" style="color: #333;">rhs_tclvl</span> <span class="n" style="color: #333;">mono_tvs</span> <span class="n" style="color: #333;">candidates</span></span>
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<pre style="margin: 0;"> <span id="LC1328" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="c1" style="color: #998; font-style: italic;">-- Promote any tyvars that we cannot generalise</span></span>
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<pre style="margin: 0;">-<span id="LC1328" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Promote mo<span class="idiff left right">m</span>omorphic tyvars]</span></span>
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<pre style="margin: 0;">+<span id="LC1329" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Promote mo<span class="idiff left right">n</span>omorphic tyvars]</span></span>
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<pre style="margin: 0;"> <span id="LC1330" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"decideMonoTyVars: promotion:"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">mono_tvs</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1331" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">any_promoted</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">promoteTyVarSet</span> <span class="n" style="color: #333;">mono_tvs</span></span>
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1332
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<pre style="margin: 0;"> <span id="LC1332" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1405,7 +1406,10 @@ decideQuantifiedTyVars name_taus psigs candidates</td>
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<pre style="margin: 0;"> <span id="LC1406" class="line" lang="haskell"> <span class="n" style="color: #333;">dvs_plus</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dv</span> <span class="p">{</span> <span class="n" style="color: #333;">dv_kvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pick</span> <span class="n" style="color: #333;">cand_kvs</span><span class="p">,</span> <span class="n" style="color: #333;">dv_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pick</span> <span class="n" style="color: #333;">cand_tvs</span> <span class="p">}</span></span>
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1407
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<pre style="margin: 0;"> <span id="LC1407" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1408" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"decideQuantifiedTyVars"</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span></span>
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<pre style="margin: 0;">-<span id="LC1408" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"candidates ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">candidates</span></span>
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<pre style="margin: 0;">+<span id="LC1409" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"tau_tys ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tau_tys</span></span>
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<pre style="margin: 0;">+<span id="LC1410" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"candidates ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">candidates</span></span>
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<pre style="margin: 0;">+<span id="LC1411" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"cand_kvs ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cand_kvs</span></span>
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<pre style="margin: 0;">+<span id="LC1412" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"cand_tvs ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cand_tvs</span></span>
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1409
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1413
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<pre style="margin: 0;"> <span id="LC1413" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"tau_tys ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tau_tys</span></span>
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1414
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<pre style="margin: 0;"> <span id="LC1414" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"seed_tys ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">seed_tys</span></span>
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1415
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<pre style="margin: 0;"> <span id="LC1415" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"seed_tcvs ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">tyCoVarsOfTypes</span> <span class="n" style="color: #333;">seed_tys</span><span class="p">)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1434,7 +1438,7 @@ growThetaTyVars theta tcvs</td>
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1434
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<pre style="margin: 0;"> <span id="LC1438" class="line" lang="haskell"> <span class="n" style="color: #333;">pred_tcvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyCoVarsOfType</span> <span class="n" style="color: #333;">pred</span></span>
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1435
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1439
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<pre style="margin: 0;"> <span id="LC1439" class="line" lang="haskell"></span>
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1436
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1440
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<pre style="margin: 0;"> <span id="LC1440" class="line" lang="haskell"></span>
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1437
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<pre style="margin: 0;">-<span id="LC1437" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Promote mo<span class="idiff left right">m</span>omorphic tyvars]</span></span>
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1441
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<pre style="margin: 0;">+<span id="LC1441" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Promote mo<span class="idiff left right">n</span>omorphic tyvars]</span></span>
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1438
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1442
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<pre style="margin: 0;"> <span id="LC1442" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1439
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1443
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<pre style="margin: 0;"> <span id="LC1443" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Promote any type variables that are free in the environment. Eg</span></span>
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1440
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1444
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<pre style="margin: 0;"> <span id="LC1444" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: forall qtvs. bound_theta => zonked_tau</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1448,7 +1452,7 @@ we don't quantify over beta (since it is fixed by envt)</td>
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1448
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1452
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<pre style="margin: 0;"> <span id="LC1452" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">so we must promote it! The inferred type is just</span></span>
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1449
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1453
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<pre style="margin: 0;"> <span id="LC1453" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: beta -> beta</span></span>
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1450
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1454
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<pre style="margin: 0;"> <span id="LC1454" class="line" lang="haskell"></span>
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1451
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<pre style="margin: 0;">-<span id="LC1451" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">NB: promoteTyVar ignores coercion variables</span></span>
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<pre style="margin: 0;">+<span id="LC1455" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">NB: promoteTyVar<span class="idiff left right">Set</span> ignores coercion variables</span></span>
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1452
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1456
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<pre style="margin: 0;"> <span id="LC1456" class="line" lang="haskell"></span>
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1457
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<pre style="margin: 0;"> <span id="LC1457" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Quantification and partial signatures]</span></span>
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1454
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1458
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<pre style="margin: 0;"> <span id="LC1458" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1660,22 +1664,14 @@ solveWantedsAndDrop wanted</td>
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1660
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<pre style="margin: 0;"> <span id="LC1664" class="line" lang="haskell"><span class="n" style="color: #333;">solveWanteds</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span></span>
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1661
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1665
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<pre style="margin: 0;"> <span id="LC1665" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- so that the inert set doesn't mindlessly propagate.</span></span>
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1662
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1666
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<pre style="margin: 0;"> <span id="LC1666" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- NB: wc_simples may be wanted /or/ derived now</span></span>
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1663
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<pre style="margin: 0;">-<span id="LC1663" class="line" lang="haskell"><span class="n" style="color: #333;">solveWanteds</span> <span class="n" style="color: #333;">wc</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_<span class="idiff left">simple</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">simples</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">wc_impl</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">implics</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">wc_</span>holes</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">holes</span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC1667" class="line" lang="haskell"><span class="n" style="color: #333;">solveWanteds</span> <span class="n" style="color: #333;">wc</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_holes</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">holes</span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC1668" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">cur_lvl</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">getTcLevel</span></span>
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<pre style="margin: 0;"> <span id="LC1669" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"solveWanteds {"</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC1670" class="line" lang="haskell"> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Level ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cur_lvl</span></span>
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<pre style="margin: 0;"> <span id="LC1671" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">wc</span> <span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC1672" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1669" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">wc1</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">solveSimpleWanteds</span> <span class="n" style="color: #333;">simples</span></span>
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<pre style="margin: 0;">-<span id="LC1670" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Any insoluble constraints are in 'simples' and so get rewritten</span></span>
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<pre style="margin: 0;">-<span id="LC1671" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Rewrite insolubles] in GHC.Tc.Solver.Monad</span></span>
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<pre style="margin: 0;">-<span id="LC1672" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1673" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">floated_eqs</span><span class="p">,</span> <span class="n" style="color: #333;">implics2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">solveNestedImplications</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC1674" class="line" lang="haskell"> <span class="n" style="color: #333;">implics</span> <span class="p">`</span><span class="n" style="color: #333;">unionBags</span><span class="p">`</span> <span class="n" style="color: #333;">wc_impl</span> <span class="n" style="color: #333;">wc1</span></span>
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<pre style="margin: 0;">-<span id="LC1675" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1676" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getDynFlags</span></span>
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<pre style="margin: 0;">-<span id="LC1677" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">solved_wc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">simpl_loop</span> <span class="mi" style="color: #099;">0</span> <span class="p">(</span><span class="n" style="color: #333;">solverIterations</span> <span class="n" style="color: #333;">dflags</span><span class="p">)</span> <span class="n" style="color: #333;">floated_eqs</span></span>
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<pre style="margin: 0;">-<span id="LC1678" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">wc1</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implics2</span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC1673" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getDynFlags</span></span>
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<pre style="margin: 0;">+<span id="LC1674" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">solved_wc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">simplify_loop</span> <span class="mi" style="color: #099;">0</span> <span class="p">(</span><span class="n" style="color: #333;">solverIterations</span> <span class="n" style="color: #333;">dflags</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="n" style="color: #333;">wc</span></span>
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<pre style="margin: 0;"> <span id="LC1675" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1676" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">holes'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">simplifyHoles</span> <span class="n" style="color: #333;">holes</span></span>
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<pre style="margin: 0;"> <span id="LC1677" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">final_wc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">solved_wc</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_holes</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">holes'</span> <span class="p">}</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1688,9 +1684,44 @@ solveWanteds wc@(WC { wc_simple = simples, wc_impl = implics, wc_holes = holes }</td>
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<pre style="margin: 0;"> <span id="LC1684" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1685" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">final_wc</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1686" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1691" class="line" lang="haskell"><span class="n" style="color: #333;">simpl_loop</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IntWithInf</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Cts</span></span>
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<pre style="margin: 0;">-<span id="LC1692" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span></span>
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<pre style="margin: 0;">-<span id="LC1693" class="line" lang="haskell"><span class="n" style="color: #333;">simpl_loop</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">limit</span> <span class="n" style="color: #333;">floated_eqs</span> <span class="n" style="color: #333;">wc</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simples</span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC1687" class="line" lang="haskell"><span class="n" style="color: #333;">simplify_loop</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IntWithInf</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC1688" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span></span>
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<pre style="margin: 0;">+<span id="LC1689" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Do a round of solving, and call maybe_simplify_again to iterate</span></span>
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<pre style="margin: 0;">+<span id="LC1690" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The 'definitely_redo_implications' flags is False if the only reason we</span></span>
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<pre style="margin: 0;">+<span id="LC1691" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- are iterating is that we have added some new Derived superclasses (from Wanteds)</span></span>
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<pre style="margin: 0;">+<span id="LC1692" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- hoping for fundeps to help us; see Note [Superclass iteration]</span></span>
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<pre style="margin: 0;">+<span id="LC1693" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC1694" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Does not affect wc_holes at all; reason: wc_holes never affects anything</span></span>
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<pre style="margin: 0;">+<span id="LC1695" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- else, so we do them once, at the end in solveWanteds</span></span>
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<pre style="margin: 0;">+<span id="LC1696" class="line" lang="haskell"><span class="n" style="color: #333;">simplify_loop</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">limit</span> <span class="n" style="color: #333;">definitely_redo_implications</span></span>
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<pre style="margin: 0;">+<span id="LC1697" class="line" lang="haskell"> <span class="n" style="color: #333;">wc</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simples</span><span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implics</span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC1698" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">csTraceTcS</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC1699" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"simplify_loop iteration="</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">int</span> <span class="n" style="color: #333;">n</span></span>
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<pre style="margin: 0;">+<span id="LC1700" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><+></span> <span class="p">(</span><span class="n" style="color: #333;">parens</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">hsep</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"definitely_redo ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">definitely_redo_implications</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">comma</span></span>
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1701
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<pre style="margin: 0;">+<span id="LC1701" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">int</span> <span class="p">(</span><span class="n" style="color: #333;">lengthBag</span> <span class="n" style="color: #333;">simples</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"simples to solve"</span> <span class="p">])</span></span>
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1702
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<pre style="margin: 0;">+<span id="LC1702" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"simplify_loop: wc ="</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">wc</span><span class="p">)</span></span>
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1703
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<pre style="margin: 0;">+<span id="LC1703" class="line" lang="haskell"></span>
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1704
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<pre style="margin: 0;">+<span id="LC1704" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">unifs1</span><span class="p">,</span> <span class="n" style="color: #333;">wc1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">reportUnifications</span> <span class="o" style="font-weight: 600;">$</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Superclass iteration]</span></span>
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1705
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<pre style="margin: 0;">+<span id="LC1705" class="line" lang="haskell"> <span class="n" style="color: #333;">solveSimpleWanteds</span> <span class="n" style="color: #333;">simples</span></span>
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1706
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<pre style="margin: 0;">+<span id="LC1706" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Any insoluble constraints are in 'simples' and so get rewritten</span></span>
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1707
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<pre style="margin: 0;">+<span id="LC1707" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Rewrite insolubles] in GHC.Tc.Solver.Monad</span></span>
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1708
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<pre style="margin: 0;">+<span id="LC1708" class="line" lang="haskell"></span>
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1709
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<pre style="margin: 0;">+<span id="LC1709" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">wc2</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">definitely_redo_implications</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Superclass iteration]</span></span>
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1710
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<pre style="margin: 0;">+<span id="LC1710" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">unifs1</span> <span class="o" style="font-weight: 600;">==</span> <span class="mi" style="color: #099;">0</span> <span class="c1" style="color: #998; font-style: italic;">-- for this conditional</span></span>
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1711
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<pre style="margin: 0;">+<span id="LC1711" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">isEmptyBag</span> <span class="p">(</span><span class="n" style="color: #333;">wc_impl</span> <span class="n" style="color: #333;">wc1</span><span class="p">)</span></span>
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1712
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<pre style="margin: 0;">+<span id="LC1712" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">wc</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wc_simple</span> <span class="n" style="color: #333;">wc1</span> <span class="p">})</span> <span class="c1" style="color: #998; font-style: italic;">-- Short cut</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1713" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1713
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<pre style="margin: 0;">+<span id="LC1713" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">implics2</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">solveNestedImplications</span> <span class="o" style="font-weight: 600;">$</span></span>
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1714
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<pre style="margin: 0;">+<span id="LC1714" class="line" lang="haskell"> <span class="n" style="color: #333;">implics</span> <span class="p">`</span><span class="n" style="color: #333;">unionBags</span><span class="p">`</span> <span class="p">(</span><span class="n" style="color: #333;">wc_impl</span> <span class="n" style="color: #333;">wc1</span><span class="p">)</span></span>
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1715
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<pre style="margin: 0;">+<span id="LC1715" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">wc</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wc_simple</span> <span class="n" style="color: #333;">wc1</span></span>
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1716
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<pre style="margin: 0;">+<span id="LC1716" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implics2</span> <span class="p">})</span> <span class="p">}</span></span>
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1717
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<pre style="margin: 0;">+<span id="LC1717" class="line" lang="haskell"></span>
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1718
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<pre style="margin: 0;">+<span id="LC1718" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">unif_happened</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">resetUnificationFlag</span></span>
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1719
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<pre style="margin: 0;">+<span id="LC1719" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [The Unification Level Flag] in GHC.Tc.Solver.Monad</span></span>
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1720
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<pre style="margin: 0;">+<span id="LC1720" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">maybe_simplify_again</span> <span class="p">(</span><span class="n" style="color: #333;">n</span><span class="o" style="font-weight: 600;">+</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="n" style="color: #333;">limit</span> <span class="n" style="color: #333;">unif_happened</span> <span class="n" style="color: #333;">wc2</span> <span class="p">}</span></span>
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1721
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<pre style="margin: 0;">+<span id="LC1721" class="line" lang="haskell"></span>
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1722
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<pre style="margin: 0;">+<span id="LC1722" class="line" lang="haskell"><span class="n" style="color: #333;">maybe_simplify_again</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IntWithInf</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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1723
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<pre style="margin: 0;">+<span id="LC1723" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span></span>
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1724
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<pre style="margin: 0;">+<span id="LC1724" class="line" lang="haskell"><span class="n" style="color: #333;">maybe_simplify_again</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">limit</span> <span class="n" style="color: #333;">unif_happened</span> <span class="n" style="color: #333;">wc</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simples</span> <span class="p">})</span></span>
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1694
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1725
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<pre style="margin: 0;"> <span id="LC1725" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">n</span> <span class="p">`</span><span class="n" style="color: #333;">intGtLimit</span><span class="p">`</span> <span class="n" style="color: #333;">limit</span></span>
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1695
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<td class="diff-line-num new_line" data-linenumber="1726" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1726
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<pre style="margin: 0;"> <span id="LC1726" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="c1" style="color: #998; font-style: italic;">-- Add an error (not a warning) if we blow the limit,</span></span>
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1696
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<td class="diff-line-num new_line" data-linenumber="1727" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1727
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<pre style="margin: 0;"> <span id="LC1727" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Typically if we blow the limit we are going to report some other error</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1699" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1730" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1699,17 +1730,12 @@ simpl_loop n limit floated_eqs wc@(WC { wc_simple = simples })</td>
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1699
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1730
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<pre style="margin: 0;"> <span id="LC1730" class="line" lang="haskell"> <span class="n" style="color: #333;">addErrTcS</span> <span class="p">(</span><span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"solveWanteds: too many iterations"</span></span>
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1700
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<td class="diff-line-num new_line" data-linenumber="1731" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1731
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<pre style="margin: 0;"> <span id="LC1731" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">parens</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"limit ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">limit</span><span class="p">))</span></span>
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1701
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<td class="diff-line-num new_line" data-linenumber="1732" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1732
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<pre style="margin: 0;"> <span id="LC1732" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Unsolved:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">wc</span></span>
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1702
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<pre style="margin: 0;">-<span id="LC1702" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppUnless</span> <span class="p">(</span><span class="n" style="color: #333;">isEmptyBag</span> <span class="n" style="color: #333;">floated_eqs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1703" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1703
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<td class="diff-line-num new_line old" data-linenumber="1733" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1703" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Floated equalities:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">floated_eqs</span></span>
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1704
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1733
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<pre style="margin: 0;"> <span id="LC1733" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Set limit with -fconstraint-solver-iterations=n; n=0 for no limit"</span></span>
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1705
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1734
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<pre style="margin: 0;"> <span id="LC1734" class="line" lang="haskell"> <span class="p">]))</span></span>
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1706
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1735
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<pre style="margin: 0;"> <span id="LC1735" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">wc</span> <span class="p">}</span></span>
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1707
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1736
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<pre style="margin: 0;"> <span id="LC1736" class="line" lang="haskell"></span>
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1708
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<pre style="margin: 0;">-<span id="LC1708" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isEmptyBag</span> <span class="n" style="color: #333;">floated_eqs</span><span class="p">)</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1709" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1709
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<pre style="margin: 0;">-<span id="LC1709" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simplify_again</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">limit</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="p">(</span><span class="n" style="color: #333;">wc</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">floated_eqs</span> <span class="p">`</span><span class="n" style="color: #333;">unionBags</span><span class="p">`</span> <span class="n" style="color: #333;">simples</span> <span class="p">})</span></span>
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1710
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<pre style="margin: 0;">-<span id="LC1710" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Put floated_eqs first so they get solved first</span></span>
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1711
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<pre style="margin: 0;">-<span id="LC1711" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: the floated_eqs may include /derived/ equalities</span></span>
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1712
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<pre style="margin: 0;">-<span id="LC1712" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- arising from fundeps inside an implication</span></span>
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1737
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<pre style="margin: 0;">+<span id="LC1737" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">unif_happened</span></span>
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1738
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<pre style="margin: 0;">+<span id="LC1738" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simplify_loop</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">limit</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="n" style="color: #333;">wc</span></span>
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1713
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1739
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<pre style="margin: 0;"> <span id="LC1739" class="line" lang="haskell"></span>
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1714
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1740
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<pre style="margin: 0;"> <span id="LC1740" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">superClassesMightHelp</span> <span class="n" style="color: #333;">wc</span></span>
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1715
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1741
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<pre style="margin: 0;"> <span id="LC1741" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- We still have unsolved goals, and apparently no way to solve them,</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1748" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1722,82 +1748,65 @@ simpl_loop n limit floated_eqs wc@(WC { wc_simple = simples })</td>
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1722
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1748
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<pre style="margin: 0;"> <span id="LC1748" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">new_given</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">makeSuperClasses</span> <span class="n" style="color: #333;">pending_given</span></span>
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1723
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1749
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<pre style="margin: 0;"> <span id="LC1749" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">new_wanted</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">makeSuperClasses</span> <span class="n" style="color: #333;">pending_wanted</span></span>
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1724
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1750
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<pre style="margin: 0;"> <span id="LC1750" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">solveSimpleGivens</span> <span class="n" style="color: #333;">new_given</span> <span class="c1" style="color: #998; font-style: italic;">-- Add the new Givens to the inert set</span></span>
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1725
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<pre style="margin: 0;">-<span id="LC1725" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">simplify_<span class="idiff left">again</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">n</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">limit</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">null</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pending_given</span></span><span class="p"><span class="idiff right">)</span></span></span>
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1751
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<pre style="margin: 0;">+<span id="LC1751" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">simplify_<span class="idiff left">loop</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">n</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">limit</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">not</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">null</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">pending_given</span></span><span class="p"><span class="idiff">))</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">$</span></span></span>
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1726
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1752
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<pre style="margin: 0;"> <span id="LC1752" class="line" lang="haskell"> <span class="n" style="color: #333;">wc</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simples1</span> <span class="p">`</span><span class="n" style="color: #333;">unionBags</span><span class="p">`</span> <span class="n" style="color: #333;">listToBag</span> <span class="n" style="color: #333;">new_wanted</span> <span class="p">}</span> <span class="p">}</span> <span class="p">}</span></span>
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<td class="diff-line-num new old_line" data-linenumber="1727" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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1753
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<pre style="margin: 0;">+<span id="LC1753" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (not (null pending_given)): see Note [Superclass iteration]</span></span>
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1727
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1754
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<pre style="margin: 0;"> <span id="LC1754" class="line" lang="haskell"></span>
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1728
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1755
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<pre style="margin: 0;"> <span id="LC1755" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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1729
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1756
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<pre style="margin: 0;"> <span id="LC1756" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">wc</span></span>
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1730
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1757
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<pre style="margin: 0;"> <span id="LC1757" class="line" lang="haskell"></span>
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1731
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<pre style="margin: 0;">-<span id="LC1731" class="line" lang="haskell"><span class="n" style="color: #333;">simplify_again</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IntWithInf</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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1732
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<pre style="margin: 0;">-<span id="LC1732" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span></span>
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1733
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<pre style="margin: 0;">-<span id="LC1733" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We have definitely decided to have another go at solving</span></span>
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1734
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<pre style="margin: 0;">-<span id="LC1734" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the wanted constraints (we have tried at least once already</span></span>
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<pre style="margin: 0;">-<span id="LC1735" class="line" lang="haskell"><span class="n" style="color: #333;">simplify_again</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">limit</span> <span class="n" style="color: #333;">no_new_given_scs</span></span>
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1736
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<pre style="margin: 0;">-<span id="LC1736" class="line" lang="haskell"> <span class="n" style="color: #333;">wc</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simples</span><span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implics</span> <span class="p">})</span></span>
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1737
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<pre style="margin: 0;">-<span id="LC1737" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">csTraceTcS</span> <span class="o" style="font-weight: 600;">$</span></span>
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1738
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<pre style="margin: 0;">-<span id="LC1738" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"simpl_loop iteration="</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">int</span> <span class="n" style="color: #333;">n</span></span>
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1739
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<pre style="margin: 0;">-<span id="LC1739" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><+></span> <span class="p">(</span><span class="n" style="color: #333;">parens</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">hsep</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"no new given superclasses ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">no_new_given_scs</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">comma</span></span>
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1740
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<pre style="margin: 0;">-<span id="LC1740" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">int</span> <span class="p">(</span><span class="n" style="color: #333;">lengthBag</span> <span class="n" style="color: #333;">simples</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"simples to solve"</span> <span class="p">])</span></span>
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1741
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<pre style="margin: 0;">-<span id="LC1741" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"simpl_loop: wc ="</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">wc</span><span class="p">)</span></span>
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1742
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<pre style="margin: 0;">-<span id="LC1742" class="line" lang="haskell"></span>
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1743
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<pre style="margin: 0;">-<span id="LC1743" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">unifs1</span><span class="p">,</span> <span class="n" style="color: #333;">wc1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">reportUnifications</span> <span class="o" style="font-weight: 600;">$</span></span>
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1744
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<pre style="margin: 0;">-<span id="LC1744" class="line" lang="haskell"> <span class="n" style="color: #333;">solveSimpleWanteds</span> <span class="o" style="font-weight: 600;">$</span></span>
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1745
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<pre style="margin: 0;">-<span id="LC1745" class="line" lang="haskell"> <span class="n" style="color: #333;">simples</span></span>
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1746
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<pre style="margin: 0;">-<span id="LC1746" class="line" lang="haskell"></span>
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1747
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<pre style="margin: 0;">-<span id="LC1747" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Cutting off simpl_loop]</span></span>
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1748
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<pre style="margin: 0;">-<span id="LC1748" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We have already tried to solve the nested implications once</span></span>
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1749
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<pre style="margin: 0;">-<span id="LC1749" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Try again only if we have unified some meta-variables</span></span>
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1750
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<pre style="margin: 0;">-<span id="LC1750" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (which is a bit like adding more givens), or we have some</span></span>
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1751
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<pre style="margin: 0;">-<span id="LC1751" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- new Given superclasses</span></span>
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1752
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<pre style="margin: 0;">-<span id="LC1752" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">new_implics</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wc_impl</span> <span class="n" style="color: #333;">wc1</span></span>
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1753
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<pre style="margin: 0;">-<span id="LC1753" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">unifs1</span> <span class="o" style="font-weight: 600;">==</span> <span class="mi" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">&&</span></span>
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1754
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<pre style="margin: 0;">-<span id="LC1754" class="line" lang="haskell"> <span class="n" style="color: #333;">no_new_given_scs</span> <span class="o" style="font-weight: 600;">&&</span></span>
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1755
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<pre style="margin: 0;">-<span id="LC1755" class="line" lang="haskell"> <span class="n" style="color: #333;">isEmptyBag</span> <span class="n" style="color: #333;">new_implics</span></span>
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<pre style="margin: 0;">-<span id="LC1756" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1757" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="c1" style="color: #998; font-style: italic;">-- Do not even try to solve the implications</span></span>
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1758
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<pre style="margin: 0;">-<span id="LC1758" class="line" lang="haskell"> <span class="n" style="color: #333;">simpl_loop</span> <span class="p">(</span><span class="n" style="color: #333;">n</span><span class="o" style="font-weight: 600;">+</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="n" style="color: #333;">limit</span> <span class="n" style="color: #333;">emptyBag</span> <span class="p">(</span><span class="n" style="color: #333;">wc1</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implics</span> <span class="p">})</span></span>
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1759
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<pre style="margin: 0;">-<span id="LC1759" class="line" lang="haskell"></span>
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1760
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<pre style="margin: 0;">-<span id="LC1760" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="c1" style="color: #998; font-style: italic;">-- Try to solve the implications</span></span>
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1761
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<pre style="margin: 0;">-<span id="LC1761" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">floated_eqs2</span><span class="p">,</span> <span class="n" style="color: #333;">implics2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">solveNestedImplications</span> <span class="o" style="font-weight: 600;">$</span></span>
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1762
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<pre style="margin: 0;">-<span id="LC1762" class="line" lang="haskell"> <span class="n" style="color: #333;">implics</span> <span class="p">`</span><span class="n" style="color: #333;">unionBags</span><span class="p">`</span> <span class="n" style="color: #333;">new_implics</span></span>
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1763
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<pre style="margin: 0;">-<span id="LC1763" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">simpl_loop</span> <span class="p">(</span><span class="n" style="color: #333;">n</span><span class="o" style="font-weight: 600;">+</span><span class="mi" style="color: #099;">1</span><span class="p">)</span> <span class="n" style="color: #333;">limit</span> <span class="n" style="color: #333;">floated_eqs2</span> <span class="p">(</span><span class="n" style="color: #333;">wc1</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implics2</span> <span class="p">})</span></span>
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1764
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<pre style="margin: 0;">-<span id="LC1764" class="line" lang="haskell"> <span class="p">}</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1758" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Superclass iteration]</span></span>
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<pre style="margin: 0;">+<span id="LC1759" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">+<span id="LC1760" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider this implication constraint</span></span>
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<pre style="margin: 0;">+<span id="LC1761" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> forall a.</span></span>
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1762
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<pre style="margin: 0;">+<span id="LC1762" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] d: C Int beta</span></span>
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1763
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<pre style="margin: 0;">+<span id="LC1763" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> forall b. blah</span></span>
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1764
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<pre style="margin: 0;">+<span id="LC1764" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">where</span></span>
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1765
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<pre style="margin: 0;">+<span id="LC1765" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> class D a b | a -> b</span></span>
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1766
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<pre style="margin: 0;">+<span id="LC1766" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> class D a b => C a b</span></span>
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1767
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<pre style="margin: 0;">+<span id="LC1767" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We will expand d's superclasses, giving [D] D Int beta, in the hope of geting</span></span>
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1768
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<pre style="margin: 0;">+<span id="LC1768" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">fundeps to unify beta. Doing so is usually fruitless (no useful fundeps),</span></span>
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1769
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<pre style="margin: 0;">+<span id="LC1769" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and if so it seems a pity to waste time iterating the implications (forall b. blah)</span></span>
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1770
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<pre style="margin: 0;">+<span id="LC1770" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(If we add new Given superclasses it's a different matter: it's really worth looking</span></span>
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<pre style="margin: 0;">+<span id="LC1771" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">at the implications.)</span></span>
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<pre style="margin: 0;">+<span id="LC1772" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1773" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Hence the definitely_redo_implications flag to simplify_loop. It's usually</span></span>
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<pre style="margin: 0;">+<span id="LC1774" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">True, but False in the case where the only reason to iterate is new Derived</span></span>
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<pre style="margin: 0;">+<span id="LC1775" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">superclasses. In that case we check whether the new Deriveds actually led to</span></span>
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<pre style="margin: 0;">+<span id="LC1776" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">any new unifications, and iterate the implications only if so.</span></span>
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<pre style="margin: 0;">+<span id="LC1777" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1778
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<pre style="margin: 0;"> <span id="LC1778" class="line" lang="haskell"></span>
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1779
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<pre style="margin: 0;"> <span id="LC1779" class="line" lang="haskell"><span class="n" style="color: #333;">solveNestedImplications</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bag</span> <span class="kt" style="color: #458; font-weight: 600;">Implication</span></span>
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1767
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<pre style="margin: 0;">-<span id="LC1767" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Cts</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff right"> </span><span class="kt" style="color: #458; font-weight: 600;">Bag</span> <span class="kt" style="color: #458; font-weight: 600;">Implication</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1780" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Bag</span> <span class="kt" style="color: #458; font-weight: 600;">Implication</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1781" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Precondition: the TcS inerts may contain unsolved simples which have</span></span>
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<pre style="margin: 0;"> <span id="LC1782" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- to be converted to givens before we go inside a nested implication.</span></span>
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1783
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<pre style="margin: 0;"> <span id="LC1783" class="line" lang="haskell"><span class="n" style="color: #333;">solveNestedImplications</span> <span class="n" style="color: #333;">implics</span></span>
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<pre style="margin: 0;"> <span id="LC1784" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isEmptyBag</span> <span class="n" style="color: #333;">implics</span></span>
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<pre style="margin: 0;">-<span id="LC1772" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">emptyBag</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">emptyBag</span></span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1785" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">emptyBag</span><span class="p">)</span></span>
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1786
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<pre style="margin: 0;"> <span id="LC1786" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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1787
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<pre style="margin: 0;"> <span id="LC1787" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"solveNestedImplications starting {"</span> <span class="n" style="color: #333;">empty</span></span>
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1775
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<pre style="margin: 0;">-<span id="LC1775" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">floated_eqs_s</span><span class="p">,</span> <span class="n" style="color: #333;">unsolved_implics</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapAndUnzipBagM</span> <span class="n" style="color: #333;">solveImplication</span> <span class="n" style="color: #333;">implics</span></span>
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1776
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<pre style="margin: 0;">-<span id="LC1776" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">floated_eqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">concatBag</span> <span class="n" style="color: #333;">floated_eqs_s</span></span>
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<pre style="margin: 0;">+<span id="LC1788" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">unsolved_implics</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapBagM</span> <span class="n" style="color: #333;">solveImplication</span> <span class="n" style="color: #333;">implics</span></span>
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<pre style="margin: 0;"> <span id="LC1789" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1790" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ... and we are back in the original TcS inerts</span></span>
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<pre style="margin: 0;"> <span id="LC1791" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Notice that the original includes the _insoluble_simples so it was safe to ignore</span></span>
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<pre style="margin: 0;"> <span id="LC1792" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- them in the beginning of this function.</span></span>
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<pre style="margin: 0;"> <span id="LC1793" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"solveNestedImplications end }"</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC1782" class="line" lang="haskell"> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"all floated_eqs ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">floated_eqs</span></span>
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1783
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<pre style="margin: 0;">-<span id="LC1783" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"unsolved_implics ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">unsolved_implics</span> <span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC1794" class="line" lang="haskell"> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"unsolved_implics ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">unsolved_implics</span> <span class="p">]</span></span>
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1784
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1795
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<pre style="margin: 0;"> <span id="LC1795" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1785" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">floated_eqs</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">catBagMaybes</span> <span class="n" style="color: #333;">unsolved_implics</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1796" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">catBagMaybes</span> <span class="n" style="color: #333;">unsolved_implics</span><span class="p">)</span> <span class="p">}</span></span>
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1797
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<pre style="margin: 0;"> <span id="LC1797" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1798" class="line" lang="haskell"><span class="n" style="color: #333;">solveImplication</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Implication</span> <span class="c1" style="color: #998; font-style: italic;">-- Wanted</span></span>
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<pre style="margin: 0;">-<span id="LC1788" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Cts</span><span class="p">,</span> <span class="c1" style="color: #998; font-style: italic;">-- All wanted or derived floated equalities: var = type</span></span>
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1789
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<pre style="margin: 0;">-<span id="LC1789" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">Implication</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Simplified implication (empty or singleton)</span></span>
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<pre style="margin: 0;">+<span id="LC1799" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">Implication</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Simplified implication (empty or singleton)</span></span>
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1800
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<pre style="margin: 0;"> <span id="LC1800" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Precondition: The TcS monad contains an empty worklist and given-only inerts</span></span>
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1801
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<pre style="margin: 0;"> <span id="LC1801" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- which after trying to solve this implication we must restore to their original value</span></span>
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1802
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<pre style="margin: 0;"> <span id="LC1802" class="line" lang="haskell"><span class="n" style="color: #333;">solveImplication</span> <span class="n" style="color: #333;">imp</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Implic</span> <span class="p">{</span> <span class="n" style="color: #333;">ic_tclvl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tclvl</span></span>
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1793
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1803
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<pre style="margin: 0;"> <span id="LC1803" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ic_binds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ev_binds_var</span></span>
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<pre style="margin: 0;">-<span id="LC1794" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ic_skols</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">skols</span></span>
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1795
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1804
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<pre style="margin: 0;"> <span id="LC1804" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ic_given</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">given_ids</span></span>
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1796
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1805
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<pre style="margin: 0;"> <span id="LC1805" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ic_wanted</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wanteds</span></span>
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1797
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1806
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<pre style="margin: 0;"> <span id="LC1806" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ic_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">info</span></span>
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1798
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1807
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<pre style="margin: 0;"> <span id="LC1807" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ic_status</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">status</span> <span class="p">})</span></span>
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1799
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1808
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<pre style="margin: 0;"> <span id="LC1808" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isSolvedStatus</span> <span class="n" style="color: #333;">status</span></span>
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1800
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<pre style="margin: 0;">-<span id="LC1800" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">emptyCts</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff right"> </span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">imp</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Do nothing</span></span>
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1809
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<pre style="margin: 0;">+<span id="LC1809" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">imp</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Do nothing</span></span>
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1801
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1810
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<pre style="margin: 0;"> <span id="LC1810" class="line" lang="haskell"></span>
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1802
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1811
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<pre style="margin: 0;"> <span id="LC1811" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="c1" style="color: #998; font-style: italic;">-- Even for IC_Insoluble it is worth doing more work</span></span>
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<td class="diff-line-num old_line" data-linenumber="1803" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1803
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1812
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<pre style="margin: 0;"> <span id="LC1812" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The insoluble stuff might be in one sub-implication</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1819" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1828" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1819,7 +1828,7 @@ solveImplication imp@(Implic { ic_tclvl = tclvl</td>
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1819
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1828
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<pre style="margin: 0;"> <span id="LC1828" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">residual_wanted</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">solveWanteds</span> <span class="n" style="color: #333;">wanteds</span></span>
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1820
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1829
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<pre style="margin: 0;"> <span id="LC1829" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- solveWanteds, *not* solveWantedsAndDrop, because</span></span>
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1821
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1830
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<pre style="margin: 0;"> <span id="LC1830" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we want to retain derived equalities so we can float</span></span>
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1822
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<pre style="margin: 0;">-<span id="LC1822" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- them out in floatEqualities</span></span>
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1831
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<pre style="margin: 0;">+<span id="LC1831" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- them out in floatEqualities<span class="idiff left right">.</span></span></span>
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1823
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1832
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<pre style="margin: 0;"> <span id="LC1832" class="line" lang="haskell"></span>
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1824
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1833
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<pre style="margin: 0;"> <span id="LC1833" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">has_eqs</span><span class="p">,</span> <span class="n" style="color: #333;">given_insols</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getHasGivenEqs</span> <span class="n" style="color: #333;">tclvl</span></span>
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1825
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1834
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<pre style="margin: 0;"> <span id="LC1834" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Call getHasGivenEqs /after/ solveWanteds, because</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1837" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1828,10 +1837,6 @@ solveImplication imp@(Implic { ic_tclvl = tclvl</td>
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1828
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1837
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<pre style="margin: 0;"> <span id="LC1837" class="line" lang="haskell"></span>
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1829
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1838
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<pre style="margin: 0;"> <span id="LC1838" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">has_eqs</span><span class="p">,</span> <span class="n" style="color: #333;">given_insols</span><span class="p">,</span> <span class="n" style="color: #333;">residual_wanted</span><span class="p">)</span> <span class="p">}</span></span>
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1830
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1839
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<pre style="margin: 0;"> <span id="LC1839" class="line" lang="haskell"></span>
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1831
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<pre style="margin: 0;">-<span id="LC1831" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">floated_eqs</span><span class="p">,</span> <span class="n" style="color: #333;">residual_wanted</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1832" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">floatEqualities</span> <span class="n" style="color: #333;">skols</span> <span class="n" style="color: #333;">given_ids</span> <span class="n" style="color: #333;">ev_binds_var</span></span>
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1833
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<pre style="margin: 0;">-<span id="LC1833" class="line" lang="haskell"> <span class="n" style="color: #333;">has_given_eqs</span> <span class="n" style="color: #333;">residual_wanted</span></span>
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1834
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<pre style="margin: 0;">-<span id="LC1834" class="line" lang="haskell"></span>
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1835
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<pre style="margin: 0;"> <span id="LC1840" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"solveImplication 2"</span></span>
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1836
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1841
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<pre style="margin: 0;"> <span id="LC1841" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">given_insols</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">residual_wanted</span><span class="p">)</span></span>
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1837
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1842
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<pre style="margin: 0;"> <span id="LC1842" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">final_wanted</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">residual_wanted</span> <span class="p">`</span><span class="n" style="color: #333;">addInsols</span><span class="p">`</span> <span class="n" style="color: #333;">given_insols</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1845,15 +1850,14 @@ solveImplication imp@(Implic { ic_tclvl = tclvl</td>
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1845
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1850
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<pre style="margin: 0;"> <span id="LC1850" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tcvs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">getTcEvTyCoVars</span> <span class="n" style="color: #333;">ev_binds_var</span></span>
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1846
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1851
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<pre style="margin: 0;"> <span id="LC1851" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"solveImplication end }"</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">vcat</span></span>
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1847
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1852
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<pre style="margin: 0;"> <span id="LC1852" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"has_given_eqs ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">has_given_eqs</span></span>
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1848
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<pre style="margin: 0;">-<span id="LC1848" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"floated_eqs ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">floated_eqs</span></span>
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1849
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1853
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<pre style="margin: 0;"> <span id="LC1853" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"res_implic ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">res_implic</span></span>
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1850
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1854
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<pre style="margin: 0;"> <span id="LC1854" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"implication evbinds ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">evBindMapBinds</span> <span class="n" style="color: #333;">evbinds</span><span class="p">)</span></span>
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1851
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1855
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<pre style="margin: 0;"> <span id="LC1855" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"implication tvcs ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tcvs</span> <span class="p">]</span></span>
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1852
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1856
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<pre style="margin: 0;"> <span id="LC1856" class="line" lang="haskell"></span>
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1853
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<pre style="margin: 0;">-<span id="LC1853" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">floated_eqs</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">res_implic</span></span><span class="p"><span class="idiff right">)</span></span> <span class="p">}</span></span>
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1857
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<pre style="margin: 0;">+<span id="LC1857" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;"><span class="idiff left right">res_implic</span></span> <span class="p">}</span></span>
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1854
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1858
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<pre style="margin: 0;"> <span id="LC1858" class="line" lang="haskell"></span>
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1855
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1859
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<pre style="margin: 0;"> <span id="LC1859" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- TcLevels must be strictly increasing (see (ImplicInv) in</span></span>
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1856
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<pre style="margin: 0;">-<span id="LC1856" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [TcLevel <span class="idiff left right">and untouchable type variable</span>s] in GHC.Tc.Utils.TcType),</span></span>
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1860
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<pre style="margin: 0;">+<span id="LC1860" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [TcLevel <span class="idiff left right">invariant</span>s] in GHC.Tc.Utils.TcType),</span></span>
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1857
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<pre style="margin: 0;"> <span id="LC1861" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- and in fact I think they should always increase one level at a time.</span></span>
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1862
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<pre style="margin: 0;"> <span id="LC1862" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1863" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Though sensible, this check causes lots of testsuite failures. It is</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2237,49 +2241,8 @@ Consider (see #9939)</td>
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<pre style="margin: 0;"> <span id="LC2241" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We report (Eq a) as redundant, whereas actually (Ord a) is. But it's</span></span>
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<pre style="margin: 0;"> <span id="LC2242" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">really not easy to detect that!</span></span>
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2239
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<pre style="margin: 0;"> <span id="LC2243" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2240" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2241" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Cutting off simpl_loop]</span></span>
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2242
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<pre style="margin: 0;">-<span id="LC2242" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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2243
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<pre style="margin: 0;">-<span id="LC2243" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">It is very important not to iterate in simpl_loop unless there is a chance</span></span>
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2244
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<pre style="margin: 0;">-<span id="LC2244" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of progress. #8474 is a classic example:</span></span>
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2245
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<pre style="margin: 0;">-<span id="LC2245" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2246" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * There's a deeply-nested chain of implication constraints.</span></span>
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2247
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<pre style="margin: 0;">-<span id="LC2247" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ?x:alpha => ?y1:beta1 => ... ?yn:betan => [W] ?x:Int</span></span>
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2248
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<pre style="margin: 0;">-<span id="LC2248" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2249" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * From the innermost one we get a [D] alpha ~ Int,</span></span>
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2250
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<pre style="margin: 0;">-<span id="LC2250" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> but alpha is untouchable until we get out to the outermost one</span></span>
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2251
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<pre style="margin: 0;">-<span id="LC2251" class="line" lang="haskell"></span>
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2252
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<pre style="margin: 0;">-<span id="LC2252" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * We float [D] alpha~Int out (it is in floated_eqs), but since alpha</span></span>
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2253
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<pre style="margin: 0;">-<span id="LC2253" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> is untouchable, the solveInteract in simpl_loop makes no progress</span></span>
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2254
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<pre style="margin: 0;">-<span id="LC2254" class="line" lang="haskell"></span>
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2255
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<pre style="margin: 0;">-<span id="LC2255" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * So there is no point in attempting to re-solve</span></span>
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2256
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<pre style="margin: 0;">-<span id="LC2256" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ?yn:betan => [W] ?x:Int</span></span>
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2257
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<pre style="margin: 0;">-<span id="LC2257" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> via solveNestedImplications, because we'll just get the</span></span>
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2258
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<pre style="margin: 0;">-<span id="LC2258" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> same [D] again</span></span>
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2259
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<pre style="margin: 0;">-<span id="LC2259" class="line" lang="haskell"></span>
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2260
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<pre style="margin: 0;">-<span id="LC2260" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * If we *do* re-solve, we'll get an infinite loop. It is cut off by</span></span>
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2261
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<pre style="margin: 0;">-<span id="LC2261" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the fixed bound of 10, but solving the next takes 10*10*...*10 (ie</span></span>
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2262
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<pre style="margin: 0;">-<span id="LC2262" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> exponentially many) iterations!</span></span>
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2263
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<pre style="margin: 0;">-<span id="LC2263" class="line" lang="haskell"></span>
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2264
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<pre style="margin: 0;">-<span id="LC2264" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Conclusion: we should call solveNestedImplications only if we did</span></span>
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2265
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<pre style="margin: 0;">-<span id="LC2265" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">some unification in solveSimpleWanteds; because that's the only way</span></span>
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2266
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<pre style="margin: 0;">-<span id="LC2266" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we'll get more Givens (a unification is like adding a Given) to</span></span>
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2267
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<pre style="margin: 0;">-<span id="LC2267" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">allow the implication to make progress.</span></span>
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2268
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2244
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<pre style="margin: 0;"> <span id="LC2244" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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2269
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2245
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<pre style="margin: 0;"> <span id="LC2245" class="line" lang="haskell"></span>
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2270
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<pre style="margin: 0;">-<span id="LC2270" class="line" lang="haskell"><span class="n" style="color: #333;">promoteTyVarTcS</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="nb" style="color: #0086b3;">()</span></span>
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2271
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<pre style="margin: 0;">-<span id="LC2271" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- When we float a constraint out of an implication we must restore</span></span>
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2272
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<pre style="margin: 0;">-<span id="LC2272" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- invariant (WantedInv) in Note [TcLevel and untouchable type variables] in GHC.Tc.Utils.TcType</span></span>
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2273
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<pre style="margin: 0;">-<span id="LC2273" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Promoting unification variables]</span></span>
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2274
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<pre style="margin: 0;">-<span id="LC2274" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We don't just call promoteTyVar because we want to use unifyTyVar,</span></span>
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2275
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<pre style="margin: 0;">-<span id="LC2275" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- not writeMetaTyVar</span></span>
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2276
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<pre style="margin: 0;">-<span id="LC2276" class="line" lang="haskell"><span class="n" style="color: #333;">promoteTyVarTcS</span> <span class="n" style="color: #333;">tv</span></span>
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2277
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<pre style="margin: 0;">-<span id="LC2277" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">tclvl</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">getTcLevel</span></span>
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2278
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<pre style="margin: 0;">-<span id="LC2278" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">isFloatedTouchableMetaTyVar</span> <span class="n" style="color: #333;">tclvl</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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2279
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<pre style="margin: 0;">-<span id="LC2279" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">cloned_tv</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">cloneMetaTyVar</span> <span class="n" style="color: #333;">tv</span></span>
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2280
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<pre style="margin: 0;">-<span id="LC2280" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">rhs_tv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setMetaTyVarTcLevel</span> <span class="n" style="color: #333;">cloned_tv</span> <span class="n" style="color: #333;">tclvl</span></span>
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<pre style="margin: 0;">-<span id="LC2281" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">unifyTyVar</span> <span class="n" style="color: #333;">tv</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">rhs_tv</span><span class="p">)</span> <span class="p">}</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC2282" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2246" class="line" lang="haskell"><span class="cd">-- | Like 'defaultTyVar', but in the TcS monad.</span></span>
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<pre style="margin: 0;"> <span id="LC2247" class="line" lang="haskell"><span class="n" style="color: #333;">defaultTyVarTcS</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;"> <span id="LC2248" class="line" lang="haskell"><span class="n" style="color: #333;">defaultTyVarTcS</span> <span class="n" style="color: #333;">the_tv</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2314,7 +2277,7 @@ approximateWC float_past_equalities wc</td>
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<pre style="margin: 0;"> <span id="LC2277" class="line" lang="haskell"> <span class="n" style="color: #333;">concatMapBag</span> <span class="p">(</span><span class="n" style="color: #333;">float_implic</span> <span class="n" style="color: #333;">trapping_tvs</span><span class="p">)</span> <span class="n" style="color: #333;">implics</span></span>
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<pre style="margin: 0;"> <span id="LC2278" class="line" lang="haskell"> <span class="n" style="color: #333;">float_implic</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyCoVarSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Implication</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Cts</span></span>
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<pre style="margin: 0;"> <span id="LC2279" class="line" lang="haskell"> <span class="n" style="color: #333;">float_implic</span> <span class="n" style="color: #333;">trapping_tvs</span> <span class="n" style="color: #333;">imp</span></span>
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<pre style="margin: 0;">-<span id="LC2317" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">float_past_equalities</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">ic_given_eqs</span> <span class="n" style="color: #333;">imp</span> <span class="o" style="font-weight: 600;"><span class="idiff left">==</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">No</span>GivenEqs</span></span>
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<pre style="margin: 0;">+<span id="LC2280" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">float_past_equalities</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">ic_given_eqs</span> <span class="n" style="color: #333;">imp</span> <span class="o" style="font-weight: 600;"><span class="idiff left">/=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Maybe</span>GivenEqs</span></span>
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<pre style="margin: 0;"> <span id="LC2281" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">float_wc</span> <span class="n" style="color: #333;">new_trapping_tvs</span> <span class="p">(</span><span class="n" style="color: #333;">ic_wanted</span> <span class="n" style="color: #333;">imp</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2282" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="c1" style="color: #998; font-style: italic;">-- Take care with equalities</span></span>
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<pre style="margin: 0;"> <span id="LC2283" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyCts</span> <span class="c1" style="color: #998; font-style: italic;">-- See (1) under Note [ApproximateWC]</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2414,7 +2377,7 @@ approximateWC to produce a list of candidate constraints. Then we MUST</td>
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<pre style="margin: 0;"> <span id="LC2377" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2378" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a) Promote any meta-tyvars that have been floated out by</span></span>
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<pre style="margin: 0;"> <span id="LC2379" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> approximateWC, to restore invariant (WantedInv) described in</span></span>
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<pre style="margin: 0;">-<span id="LC2417" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Note [TcLevel <span class="idiff left right">and untouchable type variable</span>s] in GHC.Tc.Utils.TcType.</span></span>
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<pre style="margin: 0;">+<span id="LC2380" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Note [TcLevel <span class="idiff left right">invariant</span>s] in GHC.Tc.Utils.TcType.</span></span>
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<pre style="margin: 0;"> <span id="LC2381" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2382" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> b) Default the kind of any meta-tyvars that are not mentioned in</span></span>
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<pre style="margin: 0;"> <span id="LC2383" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in the environment.</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2430,8 +2393,7 @@ Note [Promoting unification variables]</td>
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2430
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2393
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<pre style="margin: 0;"> <span id="LC2393" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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2431
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2394
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<pre style="margin: 0;"> <span id="LC2394" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">When we float an equality out of an implication we must "promote" free</span></span>
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2432
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2395
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<pre style="margin: 0;"> <span id="LC2395" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">unification variables of the equality, in order to maintain Invariant</span></span>
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2433
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<pre style="margin: 0;">-<span id="LC2433" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(WantedInv) from Note [TcLevel and untouchable type variables] in</span></span>
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2434
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<pre style="margin: 0;">-<span id="LC2434" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">TcType. for the leftover implication.</span></span>
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2396
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<pre style="margin: 0;">+<span id="LC2396" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(WantedInv) from Note [TcLevel invariants] in GHC.Tc.Types.TcType.</span></span>
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2435
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2397
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<pre style="margin: 0;"> <span id="LC2397" class="line" lang="haskell"></span>
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2436
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2398
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<pre style="margin: 0;"> <span id="LC2398" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This is absolutely necessary. Consider the following example. We start</span></span>
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2437
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2399
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<pre style="margin: 0;"> <span id="LC2399" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with two implications and a class with a functional dependency.</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2468,276 +2430,6 @@ beta! Concrete example is in indexed_types/should_fail/ExtraTcsUntch.hs:</td>
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2468
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2430
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<pre style="margin: 0;"> <span id="LC2430" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in (g1 '3', g2 undefined)</span></span>
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2469
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2431
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<pre style="margin: 0;"> <span id="LC2431" class="line" lang="haskell"></span>
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2470
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2432
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<pre style="margin: 0;"> <span id="LC2432" class="line" lang="haskell"></span>
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2471
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<pre style="margin: 0;">-<span id="LC2471" class="line" lang="haskell"></span>
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2472
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<pre style="margin: 0;">-<span id="LC2472" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">*********************************************************************************</span></span>
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2473
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<pre style="margin: 0;">-<span id="LC2473" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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2474
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<pre style="margin: 0;">-<span id="LC2474" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Floating equalities *</span></span>
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2475
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<pre style="margin: 0;">-<span id="LC2475" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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2476
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<pre style="margin: 0;">-<span id="LC2476" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">*********************************************************************************</span></span>
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2477
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<pre style="margin: 0;">-<span id="LC2477" class="line" lang="haskell"></span>
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2478
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<pre style="margin: 0;">-<span id="LC2478" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Float Equalities out of Implications]</span></span>
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2479
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<pre style="margin: 0;">-<span id="LC2479" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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2480
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<pre style="margin: 0;">-<span id="LC2480" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For ordinary pattern matches (including existentials) we float</span></span>
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2481
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<pre style="margin: 0;">-<span id="LC2481" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">equalities out of implications, for instance:</span></span>
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2482
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<pre style="margin: 0;">-<span id="LC2482" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T where</span></span>
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2483
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<pre style="margin: 0;">-<span id="LC2483" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkT :: Eq a => a -> T</span></span>
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2484
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<pre style="margin: 0;">-<span id="LC2484" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f x y = case x of MkT _ -> (y::Int)</span></span>
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2485
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<pre style="margin: 0;">-<span id="LC2485" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We get the implication constraint (x::T) (y::alpha):</span></span>
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2486
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<pre style="margin: 0;">-<span id="LC2486" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> forall a. [untouchable=alpha] Eq a => alpha ~ Int</span></span>
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2487
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<pre style="margin: 0;">-<span id="LC2487" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We want to float out the equality into a scope where alpha is no</span></span>
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2488
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<pre style="margin: 0;">-<span id="LC2488" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">longer untouchable, to solve the implication!</span></span>
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2489
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<pre style="margin: 0;">-<span id="LC2489" class="line" lang="haskell"></span>
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2490
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<pre style="margin: 0;">-<span id="LC2490" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But we cannot float equalities out of implications whose givens may</span></span>
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2491
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<pre style="margin: 0;">-<span id="LC2491" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">yield or contain equalities:</span></span>
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2492
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<pre style="margin: 0;">-<span id="LC2492" class="line" lang="haskell"></span>
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2493
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<pre style="margin: 0;">-<span id="LC2493" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T a where</span></span>
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2494
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<pre style="margin: 0;">-<span id="LC2494" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> T1 :: T Int</span></span>
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2495
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<pre style="margin: 0;">-<span id="LC2495" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> T2 :: T Bool</span></span>
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2496
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<pre style="margin: 0;">-<span id="LC2496" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> T3 :: T a</span></span>
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2497
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<pre style="margin: 0;">-<span id="LC2497" class="line" lang="haskell"></span>
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2498
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<pre style="margin: 0;">-<span id="LC2498" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> h :: T a -> a -> Int</span></span>
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2499
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<pre style="margin: 0;">-<span id="LC2499" class="line" lang="haskell"></span>
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2500
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<pre style="margin: 0;">-<span id="LC2500" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f x y = case x of</span></span>
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2501
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<pre style="margin: 0;">-<span id="LC2501" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> T1 -> y::Int</span></span>
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2502
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<pre style="margin: 0;">-<span id="LC2502" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> T2 -> y::Bool</span></span>
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2503
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<pre style="margin: 0;">-<span id="LC2503" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> T3 -> h x y</span></span>
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2504
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<pre style="margin: 0;">-<span id="LC2504" class="line" lang="haskell"></span>
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2505
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<pre style="margin: 0;">-<span id="LC2505" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We generate constraint, for (x::T alpha) and (y :: beta):</span></span>
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<pre style="margin: 0;">-<span id="LC2506" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [untouchables = beta] (alpha ~ Int => beta ~ Int) -- From 1st branch</span></span>
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<pre style="margin: 0;">-<span id="LC2507" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [untouchables = beta] (alpha ~ Bool => beta ~ Bool) -- From 2nd branch</span></span>
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<pre style="margin: 0;">-<span id="LC2508" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (alpha ~ beta) -- From 3rd branch</span></span>
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<pre style="margin: 0;">-<span id="LC2509" class="line" lang="haskell"></span>
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2510
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<pre style="margin: 0;">-<span id="LC2510" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If we float the equality (beta ~ Int) outside of the first implication and</span></span>
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2511
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<pre style="margin: 0;">-<span id="LC2511" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the equality (beta ~ Bool) out of the second we get an insoluble constraint.</span></span>
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2512
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<pre style="margin: 0;">-<span id="LC2512" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But if we just leave them inside the implications, we unify alpha := beta and</span></span>
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2513
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<pre style="margin: 0;">-<span id="LC2513" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">solve everything.</span></span>
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2514
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<pre style="margin: 0;">-<span id="LC2514" class="line" lang="haskell"></span>
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2515
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<pre style="margin: 0;">-<span id="LC2515" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Principle:</span></span>
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2516
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<pre style="margin: 0;">-<span id="LC2516" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We do not want to float equalities out which may</span></span>
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2517
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<pre style="margin: 0;">-<span id="LC2517" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> need the given *evidence* to become soluble.</span></span>
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2518
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<pre style="margin: 0;">-<span id="LC2518" class="line" lang="haskell"></span>
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2519
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<pre style="margin: 0;">-<span id="LC2519" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consequence: classes with functional dependencies don't matter (since there is</span></span>
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2520
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<pre style="margin: 0;">-<span id="LC2520" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">no evidence for a fundep equality), but equality superclasses do matter (since</span></span>
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2521
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<pre style="margin: 0;">-<span id="LC2521" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">they carry evidence).</span></span>
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2522
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<pre style="margin: 0;">-<span id="LC2522" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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2523
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<pre style="margin: 0;">-<span id="LC2523" class="line" lang="haskell"></span>
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2524
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<pre style="margin: 0;">-<span id="LC2524" class="line" lang="haskell"><span class="n" style="color: #333;">floatEqualities</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">EvId</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">EvBindsVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HasGivenEqs</span></span>
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2525
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<pre style="margin: 0;">-<span id="LC2525" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span></span>
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2526
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<pre style="margin: 0;">-<span id="LC2526" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Cts</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span><span class="p">)</span></span>
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2527
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<pre style="margin: 0;">-<span id="LC2527" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Main idea: see Note [Float Equalities out of Implications]</span></span>
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2528
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<pre style="margin: 0;">-<span id="LC2528" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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2529
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<pre style="margin: 0;">-<span id="LC2529" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Precondition: the wc_simple of the incoming WantedConstraints are</span></span>
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2530
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<pre style="margin: 0;">-<span id="LC2530" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- fully zonked, so that we can see their free variables</span></span>
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2531
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<pre style="margin: 0;">-<span id="LC2531" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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2532
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<pre style="margin: 0;">-<span id="LC2532" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Postcondition: The returned floated constraints (Cts) are only</span></span>
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2533
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<pre style="margin: 0;">-<span id="LC2533" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Wanted or Derived</span></span>
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2534
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<pre style="margin: 0;">-<span id="LC2534" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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2535
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<pre style="margin: 0;">-<span id="LC2535" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Also performs some unifications (via promoteTyVar), adding to</span></span>
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2536
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<td class="diff-line-num new_line old" data-linenumber="2433" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC2536" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- monadically-carried ty_binds. These will be used when processing</span></span>
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2537
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<pre style="margin: 0;">-<span id="LC2537" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- floated_eqs later</span></span>
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2538
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<pre style="margin: 0;">-<span id="LC2538" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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2539
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<pre style="margin: 0;">-<span id="LC2539" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Subtleties: Note [Float equalities from under a skolem binding]</span></span>
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2540
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<pre style="margin: 0;">-<span id="LC2540" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note [Skolem escape]</span></span>
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2541
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<pre style="margin: 0;">-<span id="LC2541" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note [What prevents a constraint from floating]</span></span>
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2542
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<pre style="margin: 0;">-<span id="LC2542" class="line" lang="haskell"><span class="n" style="color: #333;">floatEqualities</span> <span class="n" style="color: #333;">skols</span> <span class="n" style="color: #333;">given_ids</span> <span class="n" style="color: #333;">ev_binds_var</span> <span class="n" style="color: #333;">has_given_eqs</span></span>
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2543
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<pre style="margin: 0;">-<span id="LC2543" class="line" lang="haskell"> <span class="n" style="color: #333;">wanteds</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simples</span> <span class="p">})</span></span>
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2544
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<td class="diff-line-num new_line old" data-linenumber="2433" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC2544" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeGivenEqs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">has_given_eqs</span> <span class="c1" style="color: #998; font-style: italic;">-- There are some given equalities, so don't float</span></span>
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2545
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<pre style="margin: 0;">-<span id="LC2545" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">emptyBag</span><span class="p">,</span> <span class="n" style="color: #333;">wanteds</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Note [Float Equalities out of Implications]</span></span>
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2546
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<pre style="margin: 0;">-<span id="LC2546" class="line" lang="haskell"></span>
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2547
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<pre style="margin: 0;">-<span id="LC2547" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<td class="diff-line-num old old_line" data-linenumber="2548" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2548
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<pre style="margin: 0;">-<span id="LC2548" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="c1" style="color: #998; font-style: italic;">-- First zonk: the inert set (from whence they came) is not</span></span>
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<td class="diff-line-num old old_line" data-linenumber="2549" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2549
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<pre style="margin: 0;">-<span id="LC2549" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- necessarily fully zonked; equalities are not kicked out</span></span>
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2550
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<pre style="margin: 0;">-<span id="LC2550" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- if a unification cannot make progress. See Note</span></span>
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2551
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<pre style="margin: 0;">-<span id="LC2551" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- [inert_eqs: the inert equalities] in GHC.Tc.Solver.Monad, which</span></span>
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2552
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<pre style="margin: 0;">-<span id="LC2552" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- describes how the inert set might not actually be inert.</span></span>
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<pre style="margin: 0;">-<span id="LC2553" class="line" lang="haskell"> <span class="n" style="color: #333;">simples</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">zonkSimples</span> <span class="n" style="color: #333;">simples</span></span>
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<pre style="margin: 0;">-<span id="LC2554" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">binds</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">getTcEvBindsMap</span> <span class="n" style="color: #333;">ev_binds_var</span></span>
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2555
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<pre style="margin: 0;">-<span id="LC2555" class="line" lang="haskell"></span>
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2556
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<pre style="margin: 0;">-<span id="LC2556" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Now we can pick the ones to float</span></span>
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2557
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<pre style="margin: 0;">-<span id="LC2557" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The constraints are de-canonicalised</span></span>
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2558
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<pre style="margin: 0;">-<span id="LC2558" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">candidate_eqs</span><span class="p">,</span> <span class="n" style="color: #333;">no_float_cts</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">partitionBag</span> <span class="n" style="color: #333;">is_float_eq_candidate</span> <span class="n" style="color: #333;">simples</span></span>
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2559
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<pre style="margin: 0;">-<span id="LC2559" class="line" lang="haskell"></span>
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2560
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<pre style="margin: 0;">-<span id="LC2560" class="line" lang="haskell"> <span class="n" style="color: #333;">seed_skols</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkVarSet</span> <span class="n" style="color: #333;">skols</span> <span class="p">`</span><span class="n" style="color: #333;">unionVarSet</span><span class="p">`</span></span>
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2561
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<pre style="margin: 0;">-<span id="LC2561" class="line" lang="haskell"> <span class="n" style="color: #333;">mkVarSet</span> <span class="n" style="color: #333;">given_ids</span> <span class="p">`</span><span class="n" style="color: #333;">unionVarSet</span><span class="p">`</span></span>
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2562
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<pre style="margin: 0;">-<span id="LC2562" class="line" lang="haskell"> <span class="n" style="color: #333;">foldr</span> <span class="n" style="color: #333;">add_non_flt_ct</span> <span class="n" style="color: #333;">emptyVarSet</span> <span class="n" style="color: #333;">no_float_cts</span> <span class="p">`</span><span class="n" style="color: #333;">unionVarSet</span><span class="p">`</span></span>
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2563
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<pre style="margin: 0;">-<span id="LC2563" class="line" lang="haskell"> <span class="n" style="color: #333;">evBindMapToVarSet</span> <span class="n" style="color: #333;">binds</span></span>
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2564
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<pre style="margin: 0;">-<span id="LC2564" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- seed_skols: See Note [What prevents a constraint from floating] (1,2,3)</span></span>
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2565
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<pre style="margin: 0;">-<span id="LC2565" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Include the EvIds of any non-floating constraints</span></span>
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2566
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<pre style="margin: 0;">-<span id="LC2566" class="line" lang="haskell"></span>
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2567
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<pre style="margin: 0;">-<span id="LC2567" class="line" lang="haskell"> <span class="n" style="color: #333;">extended_skols</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">transCloVarSet</span> <span class="p">(</span><span class="n" style="color: #333;">add_captured_ev_ids</span> <span class="n" style="color: #333;">candidate_eqs</span><span class="p">)</span> <span class="n" style="color: #333;">seed_skols</span></span>
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2568
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<pre style="margin: 0;">-<span id="LC2568" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- extended_skols contains the EvIds of all the trapped constraints</span></span>
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2569
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<pre style="margin: 0;">-<span id="LC2569" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [What prevents a constraint from floating] (3)</span></span>
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2570
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<pre style="margin: 0;">-<span id="LC2570" class="line" lang="haskell"></span>
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2571
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<pre style="margin: 0;">-<span id="LC2571" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">flt_eqs</span><span class="p">,</span> <span class="n" style="color: #333;">no_flt_eqs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">partitionBag</span> <span class="p">(</span><span class="n" style="color: #333;">is_floatable</span> <span class="n" style="color: #333;">extended_skols</span><span class="p">)</span></span>
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2572
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<pre style="margin: 0;">-<span id="LC2572" class="line" lang="haskell"> <span class="n" style="color: #333;">candidate_eqs</span></span>
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2573
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<pre style="margin: 0;">-<span id="LC2573" class="line" lang="haskell"></span>
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2574
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<pre style="margin: 0;">-<span id="LC2574" class="line" lang="haskell"> <span class="n" style="color: #333;">remaining_simples</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">no_float_cts</span> <span class="p">`</span><span class="n" style="color: #333;">andCts</span><span class="p">`</span> <span class="n" style="color: #333;">no_flt_eqs</span></span>
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<pre style="margin: 0;">-<span id="LC2575" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2576" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Promote any unification variables mentioned in the floated equalities</span></span>
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<pre style="margin: 0;">-<span id="LC2577" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Promoting unification variables]</span></span>
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<pre style="margin: 0;">-<span id="LC2578" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mapM_</span> <span class="n" style="color: #333;">promoteTyVarTcS</span> <span class="p">(</span><span class="n" style="color: #333;">tyCoVarsOfCtsList</span> <span class="n" style="color: #333;">flt_eqs</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC2579" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2580" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"floatEqualities"</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Skols ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">skols</span></span>
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<pre style="margin: 0;">-<span id="LC2581" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Extended skols ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">extended_skols</span></span>
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<pre style="margin: 0;">-<span id="LC2582" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Simples ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">simples</span></span>
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<pre style="margin: 0;">-<span id="LC2583" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Candidate eqs ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">candidate_eqs</span></span>
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<pre style="margin: 0;">-<span id="LC2584" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Floated eqs ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">flt_eqs</span><span class="p">])</span></span>
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<pre style="margin: 0;">-<span id="LC2585" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span> <span class="n" style="color: #333;">flt_eqs</span><span class="p">,</span> <span class="n" style="color: #333;">wanteds</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">remaining_simples</span> <span class="p">}</span> <span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC2586" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2587" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC2588" class="line" lang="haskell"> <span class="n" style="color: #333;">add_non_flt_ct</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span></span>
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<pre style="margin: 0;">-<span id="LC2589" class="line" lang="haskell"> <span class="n" style="color: #333;">add_non_flt_ct</span> <span class="n" style="color: #333;">ct</span> <span class="n" style="color: #333;">acc</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isDerivedCt</span> <span class="n" style="color: #333;">ct</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">acc</span></span>
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<pre style="margin: 0;">-<span id="LC2590" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendVarSet</span> <span class="n" style="color: #333;">acc</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvId</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC2591" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2592" class="line" lang="haskell"> <span class="n" style="color: #333;">is_floatable</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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2593
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<pre style="margin: 0;">-<span id="LC2593" class="line" lang="haskell"> <span class="n" style="color: #333;">is_floatable</span> <span class="n" style="color: #333;">skols</span> <span class="n" style="color: #333;">ct</span></span>
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<pre style="margin: 0;">-<span id="LC2594" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isDerivedCt</span> <span class="n" style="color: #333;">ct</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyCoVarsOfCt</span> <span class="n" style="color: #333;">ct</span> <span class="p">`</span><span class="n" style="color: #333;">disjointVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">skols</span></span>
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<pre style="margin: 0;">-<span id="LC2595" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvId</span> <span class="n" style="color: #333;">ct</span> <span class="p">`</span><span class="n" style="color: #333;">elemVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">skols</span><span class="p">)</span></span>
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2596
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<pre style="margin: 0;">-<span id="LC2596" class="line" lang="haskell"></span>
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2597
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<pre style="margin: 0;">-<span id="LC2597" class="line" lang="haskell"> <span class="n" style="color: #333;">add_captured_ev_ids</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Cts</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span></span>
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2598
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<pre style="margin: 0;">-<span id="LC2598" class="line" lang="haskell"> <span class="n" style="color: #333;">add_captured_ev_ids</span> <span class="n" style="color: #333;">cts</span> <span class="n" style="color: #333;">skols</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldr</span> <span class="n" style="color: #333;">extra_skol</span> <span class="n" style="color: #333;">emptyVarSet</span> <span class="n" style="color: #333;">cts</span></span>
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2599
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<pre style="margin: 0;">-<span id="LC2599" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2600
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<pre style="margin: 0;">-<span id="LC2600" class="line" lang="haskell"> <span class="n" style="color: #333;">extra_skol</span> <span class="n" style="color: #333;">ct</span> <span class="n" style="color: #333;">acc</span></span>
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2601
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<pre style="margin: 0;">-<span id="LC2601" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isDerivedCt</span> <span class="n" style="color: #333;">ct</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">acc</span></span>
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2602
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<pre style="margin: 0;">-<span id="LC2602" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">tyCoVarsOfCt</span> <span class="n" style="color: #333;">ct</span> <span class="p">`</span><span class="n" style="color: #333;">intersectsVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">skols</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendVarSet</span> <span class="n" style="color: #333;">acc</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvId</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span></span>
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2603
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<pre style="margin: 0;">-<span id="LC2603" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">acc</span></span>
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2604
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<pre style="margin: 0;">-<span id="LC2604" class="line" lang="haskell"></span>
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2605
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<pre style="margin: 0;">-<span id="LC2605" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Identify which equalities are candidates for floating</span></span>
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2606
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<pre style="margin: 0;">-<span id="LC2606" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Float out alpha ~ ty which might be unified outside</span></span>
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2607
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<pre style="margin: 0;">-<span id="LC2607" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Which equalities to float]</span></span>
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2608
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<pre style="margin: 0;">-<span id="LC2608" class="line" lang="haskell"> <span class="n" style="color: #333;">is_float_eq_candidate</span> <span class="n" style="color: #333;">ct</span></span>
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2609
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<pre style="margin: 0;">-<span id="LC2609" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">pred</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ctPred</span> <span class="n" style="color: #333;">ct</span></span>
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2610
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<pre style="margin: 0;">-<span id="LC2610" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">EqPred</span> <span class="kt" style="color: #458; font-weight: 600;">NomEq</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">classifyPredType</span> <span class="n" style="color: #333;">pred</span></span>
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2611
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<pre style="margin: 0;">-<span id="LC2611" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">ct</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2612
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<pre style="margin: 0;">-<span id="LC2612" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CIrredCan</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Do not float blocked constraints]</span></span>
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2613
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<pre style="margin: 0;">-<span id="LC2613" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="c1" style="color: #998; font-style: italic;">-- See #18855</span></span>
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2614
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<pre style="margin: 0;">-<span id="LC2614" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">float_eq</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">float_eq</span> <span class="n" style="color: #333;">ty2</span> <span class="n" style="color: #333;">ty1</span></span>
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2615
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<pre style="margin: 0;">-<span id="LC2615" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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2616
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<pre style="margin: 0;">-<span id="LC2616" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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2617
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<pre style="margin: 0;">-<span id="LC2617" class="line" lang="haskell"></span>
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2618
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<pre style="margin: 0;">-<span id="LC2618" class="line" lang="haskell"> <span class="n" style="color: #333;">float_eq</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span></span>
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2619
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<pre style="margin: 0;">-<span id="LC2619" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">getTyVar_maybe</span> <span class="n" style="color: #333;">ty1</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2620
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<pre style="margin: 0;">-<span id="LC2620" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">tv1</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">isMetaTyVar</span> <span class="n" style="color: #333;">tv1</span></span>
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2621
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<pre style="margin: 0;">-<span id="LC2621" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">&&</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isTyVarTyVar</span> <span class="n" style="color: #333;">tv1</span><span class="p">)</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">isTyVarTy</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span></span>
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2622
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<pre style="margin: 0;">-<span id="LC2622" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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2623
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<pre style="margin: 0;">-<span id="LC2623" class="line" lang="haskell"></span>
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2624
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<pre style="margin: 0;">-<span id="LC2624" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Do not float blocked constraints]</span></span>
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2625
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<pre style="margin: 0;">-<span id="LC2625" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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2626
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<pre style="margin: 0;">-<span id="LC2626" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">As #18855 showed, we must not float an equality that is blocked.</span></span>
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2627
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<pre style="margin: 0;">-<span id="LC2627" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider</span></span>
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2628
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<pre style="margin: 0;">-<span id="LC2628" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> forall a[4]. [W] co1: alpha[4] ~ Maybe (a[4] |> bco)</span></span>
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2629
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<pre style="margin: 0;">-<span id="LC2629" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] co2: alpha[4] ~ Maybe (beta[4] |> bco])</span></span>
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2630
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<pre style="margin: 0;">-<span id="LC2630" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] bco: kappa[2] ~ Type</span></span>
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2631
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<pre style="margin: 0;">-<span id="LC2631" class="line" lang="haskell"></span>
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2632
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<pre style="margin: 0;">-<span id="LC2632" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Now co1, co2 are blocked by bco. We will eventually float out bco</span></span>
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2633
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<pre style="margin: 0;">-<span id="LC2633" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and solve it at level 2. But the danger is that we will *also*</span></span>
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2634
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<pre style="margin: 0;">-<span id="LC2634" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">float out co2, and that is bad bad bad. Because we'll promote alpha</span></span>
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2635
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<pre style="margin: 0;">-<span id="LC2635" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and beta to level 2, and then fail to unify the promoted beta</span></span>
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2636
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<pre style="margin: 0;">-<span id="LC2636" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with the skolem a[4].</span></span>
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2637
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<pre style="margin: 0;">-<span id="LC2637" class="line" lang="haskell"></span>
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2638
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<pre style="margin: 0;">-<span id="LC2638" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Solution: don't float out blocked equalities. Remember: we only want</span></span>
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2639
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<pre style="margin: 0;">-<span id="LC2639" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to float out if we can solve; see Note [Which equalities to float].</span></span>
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<pre style="margin: 0;">-<span id="LC2640" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2641" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(Future plan: kill floating altogether.)</span></span>
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<pre style="margin: 0;">-<span id="LC2642" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2643" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Float equalities from under a skolem binding]</span></span>
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2644
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<pre style="margin: 0;">-<span id="LC2644" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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2645
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<pre style="margin: 0;">-<span id="LC2645" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Which of the simple equalities can we float out? Obviously, only</span></span>
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2646
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<pre style="margin: 0;">-<span id="LC2646" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">ones that don't mention the skolem-bound variables. But that is</span></span>
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2647
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<pre style="margin: 0;">-<span id="LC2647" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">over-eager. Consider</span></span>
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2648
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<pre style="margin: 0;">-<span id="LC2648" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [2] forall a. F a beta[1] ~ gamma[2], G beta[1] gamma[2] ~ Int</span></span>
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2649
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<pre style="margin: 0;">-<span id="LC2649" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The second constraint doesn't mention 'a'. But if we float it,</span></span>
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2650
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<pre style="margin: 0;">-<span id="LC2650" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we'll promote gamma[2] to gamma'[1]. Now suppose that we learn that</span></span>
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2651
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<pre style="margin: 0;">-<span id="LC2651" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">beta := Bool, and F a Bool = a, and G Bool _ = Int. Then we'll</span></span>
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2652
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<pre style="margin: 0;">-<span id="LC2652" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we left with the constraint</span></span>
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2653
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<pre style="margin: 0;">-<span id="LC2653" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [2] forall a. a ~ gamma'[1]</span></span>
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2654
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<pre style="margin: 0;">-<span id="LC2654" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">which is insoluble because gamma became untouchable.</span></span>
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2655
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<pre style="margin: 0;">-<span id="LC2655" class="line" lang="haskell"></span>
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2656
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<pre style="margin: 0;">-<span id="LC2656" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Solution: float only constraints that stand a jolly good chance of</span></span>
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2657
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<pre style="margin: 0;">-<span id="LC2657" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">being soluble simply by being floated, namely ones of form</span></span>
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2658
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<pre style="margin: 0;">-<span id="LC2658" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a ~ ty</span></span>
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2659
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<pre style="margin: 0;">-<span id="LC2659" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">where 'a' is a currently-untouchable unification variable, but may</span></span>
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2660
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<pre style="margin: 0;">-<span id="LC2660" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">become touchable by being floated (perhaps by more than one level).</span></span>
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2661
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<pre style="margin: 0;">-<span id="LC2661" class="line" lang="haskell"></span>
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2662
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<pre style="margin: 0;">-<span id="LC2662" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We had a very complicated rule previously, but this is nice and</span></span>
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2663
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<pre style="margin: 0;">-<span id="LC2663" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">simple. (To see the notes, look at this Note in a version of</span></span>
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2664
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<pre style="margin: 0;">-<span id="LC2664" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC.Tc.Solver prior to Oct 2014).</span></span>
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2665
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<pre style="margin: 0;">-<span id="LC2665" class="line" lang="haskell"></span>
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2666
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<pre style="margin: 0;">-<span id="LC2666" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Which equalities to float]</span></span>
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2667
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<pre style="margin: 0;">-<span id="LC2667" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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2668
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<pre style="margin: 0;">-<span id="LC2668" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Which equalities should we float? We want to float ones where there</span></span>
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2669
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<pre style="margin: 0;">-<span id="LC2669" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is a decent chance that floating outwards will allow unification to</span></span>
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2670
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<pre style="margin: 0;">-<span id="LC2670" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">happen. In particular, float out equalities that are:</span></span>
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2671
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<pre style="margin: 0;">-<span id="LC2671" class="line" lang="haskell"></span>
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2672
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<pre style="margin: 0;">-<span id="LC2672" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Of form (alpha ~# ty) or (ty ~# alpha), where</span></span>
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2673
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<pre style="margin: 0;">-<span id="LC2673" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * alpha is a meta-tyvar.</span></span>
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2674
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<pre style="margin: 0;">-<span id="LC2674" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * And 'alpha' is not a TyVarTv with 'ty' being a non-tyvar. In that</span></span>
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2675
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<pre style="margin: 0;">-<span id="LC2675" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> case, floating out won't help either, and it may affect grouping</span></span>
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2676
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<pre style="margin: 0;">-<span id="LC2676" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> of error messages.</span></span>
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2677
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<pre style="margin: 0;">-<span id="LC2677" class="line" lang="haskell"></span>
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2678
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<pre style="margin: 0;">-<span id="LC2678" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> NB: generally we won't see (ty ~ alpha), with alpha on the right because</span></span>
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2679
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<pre style="margin: 0;">-<span id="LC2679" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> of Note [Unification variables on the left] in GHC.Tc.Utils.Unify,</span></span>
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2680
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<pre style="margin: 0;">-<span id="LC2680" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> but if we have (F tys ~ alpha) and alpha is untouchable, then it will</span></span>
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2681
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<pre style="margin: 0;">-<span id="LC2681" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> appear on the right. Example T4494.</span></span>
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2682
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<pre style="margin: 0;">-<span id="LC2682" class="line" lang="haskell"></span>
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2683
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<pre style="margin: 0;">-<span id="LC2683" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Nominal. No point in floating (alpha ~R# ty), because we do not</span></span>
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2684
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<pre style="margin: 0;">-<span id="LC2684" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> unify representational equalities even if alpha is touchable.</span></span>
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2685
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<pre style="margin: 0;">-<span id="LC2685" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> See Note [Do not unify representational equalities] in GHC.Tc.Solver.Interact.</span></span>
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2686
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<pre style="margin: 0;">-<span id="LC2686" class="line" lang="haskell"></span>
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2687
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<pre style="margin: 0;">-<span id="LC2687" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Skolem escape]</span></span>
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2688
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<pre style="margin: 0;">-<span id="LC2688" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~</span></span>
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2689
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<pre style="margin: 0;">-<span id="LC2689" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">You might worry about skolem escape with all this floating.</span></span>
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2690
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<pre style="margin: 0;">-<span id="LC2690" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For example, consider</span></span>
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2691
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<pre style="margin: 0;">-<span id="LC2691" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [2] forall a. (a ~ F beta[2] delta,</span></span>
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2692
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<pre style="margin: 0;">-<span id="LC2692" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Maybe beta[2] ~ gamma[1])</span></span>
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2693
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<pre style="margin: 0;">-<span id="LC2693" class="line" lang="haskell"></span>
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2694
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<pre style="margin: 0;">-<span id="LC2694" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The (Maybe beta ~ gamma) doesn't mention 'a', so we float it, and</span></span>
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2695
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<pre style="margin: 0;">-<span id="LC2695" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">solve with gamma := beta. But what if later delta:=Int, and</span></span>
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2696
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<pre style="margin: 0;">-<span id="LC2696" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> F b Int = b.</span></span>
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2697
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<pre style="margin: 0;">-<span id="LC2697" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Then we'd get a ~ beta[2], and solve to get beta:=a, and now the</span></span>
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2698
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<pre style="margin: 0;">-<span id="LC2698" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">skolem has escaped!</span></span>
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2699
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<pre style="margin: 0;">-<span id="LC2699" class="line" lang="haskell"></span>
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2700
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<pre style="margin: 0;">-<span id="LC2700" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But it's ok: when we float (Maybe beta[2] ~ gamma[1]), we promote beta[2]</span></span>
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2701
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<pre style="margin: 0;">-<span id="LC2701" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to beta[1], and that means the (a ~ beta[1]) will be stuck, as it should be.</span></span>
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2702
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<pre style="margin: 0;">-<span id="LC2702" class="line" lang="haskell"></span>
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2703
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<pre style="margin: 0;">-<span id="LC2703" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [What prevents a constraint from floating]</span></span>
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2704
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<pre style="margin: 0;">-<span id="LC2704" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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2705
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<pre style="margin: 0;">-<span id="LC2705" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">What /prevents/ a constraint from floating? If it mentions one of the</span></span>
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2706
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<pre style="margin: 0;">-<span id="LC2706" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">"bound variables of the implication". What are they?</span></span>
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2707
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<pre style="margin: 0;">-<span id="LC2707" class="line" lang="haskell"></span>
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2708
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<pre style="margin: 0;">-<span id="LC2708" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The "bound variables of the implication" are</span></span>
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2709
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<pre style="margin: 0;">-<span id="LC2709" class="line" lang="haskell"></span>
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2710
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<pre style="margin: 0;">-<span id="LC2710" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 1. The skolem type variables `ic_skols`</span></span>
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2711
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<pre style="margin: 0;">-<span id="LC2711" class="line" lang="haskell"></span>
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2712
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<pre style="margin: 0;">-<span id="LC2712" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 2. The "given" evidence variables `ic_given`. Example:</span></span>
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2713
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<pre style="margin: 0;">-<span id="LC2713" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> forall a. (co :: t1 ~# t2) => [W] co2 : (a ~# b |> co)</span></span>
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2714
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<pre style="margin: 0;">-<span id="LC2714" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Here 'co' is bound</span></span>
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2715
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<pre style="margin: 0;">-<span id="LC2715" class="line" lang="haskell"></span>
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2716
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<pre style="margin: 0;">-<span id="LC2716" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 3. The binders of all evidence bindings in `ic_binds`. Example</span></span>
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2717
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<pre style="margin: 0;">-<span id="LC2717" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> forall a. (d :: t1 ~ t2)</span></span>
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2718
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<pre style="margin: 0;">-<span id="LC2718" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> EvBinds { (co :: t1 ~# t2) = superclass-sel d }</span></span>
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2719
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<pre style="margin: 0;">-<span id="LC2719" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> => [W] co2 : (a ~# b |> co)</span></span>
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2720
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<pre style="margin: 0;">-<span id="LC2720" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Here `co` is gotten by superclass selection from `d`, and the</span></span>
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2721
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<pre style="margin: 0;">-<span id="LC2721" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> wanted constraint co2 must not float.</span></span>
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2722
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<pre style="margin: 0;">-<span id="LC2722" class="line" lang="haskell"></span>
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2723
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<pre style="margin: 0;">-<span id="LC2723" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 4. And the evidence variable of any equality constraint (incl</span></span>
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2724
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<pre style="margin: 0;">-<span id="LC2724" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Wanted ones) whose type mentions a bound variable. Example:</span></span>
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2725
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<pre style="margin: 0;">-<span id="LC2725" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> forall k. [W] co1 :: t1 ~# t2 |> co2</span></span>
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2726
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<pre style="margin: 0;">-<span id="LC2726" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] co2 :: k ~# *</span></span>
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2727
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<pre style="margin: 0;">-<span id="LC2727" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Here, since `k` is bound, so is `co2` and hence so is `co1`.</span></span>
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2728
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<pre style="margin: 0;">-<span id="LC2728" class="line" lang="haskell"></span>
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2729
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<pre style="margin: 0;">-<span id="LC2729" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here (1,2,3) are handled by the "seed_skols" calculation, and</span></span>
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2730
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<pre style="margin: 0;">-<span id="LC2730" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(4) is done by the transCloVarSet call.</span></span>
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2731
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<pre style="margin: 0;">-<span id="LC2731" class="line" lang="haskell"></span>
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2732
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<pre style="margin: 0;">-<span id="LC2732" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The possible dependence on givens, and evidence bindings, is more</span></span>
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2733
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<pre style="margin: 0;">-<span id="LC2733" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">subtle than we'd realised at first. See #14584.</span></span>
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2734
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<pre style="margin: 0;">-<span id="LC2734" class="line" lang="haskell"></span>
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2735
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<pre style="margin: 0;">-<span id="LC2735" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">How can (4) arise? Suppose we have (k :: *), (a :: k), and ([G} k ~ *).</span></span>
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2736
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<pre style="margin: 0;">-<span id="LC2736" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Then form an equality like (a ~ Int) we might end up with</span></span>
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2737
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<pre style="margin: 0;">-<span id="LC2737" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] co1 :: k ~ *</span></span>
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<pre style="margin: 0;">-<span id="LC2738" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] co2 :: (a |> co1) ~ Int</span></span>
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<pre style="margin: 0;">-<span id="LC2739" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2740" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2433" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">*********************************************************************************</span></span>
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<pre style="margin: 0;"> <span id="LC2434" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<pre style="margin: 0;"> <span id="LC2435" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Defaulting and disambiguation *</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4f85f14177d0b2be1c1489bc69ad4f69372e1fb4#f018e77421f495c6f75733fee4a511cfe57bebe8"><strong>compiler/GHC/Tc/Solver/Canonical.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -4,9 +4,9 @@</td>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.Tc.Solver.Canonical</span><span class="p">(</span></span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="haskell"> <span class="n" style="color: #333;">canonicalize</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC7" class="line" lang="haskell"> <span class="n" style="color: #333;">unifyDerived</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"> <span class="n" style="color: #333;">unifyDerived</span><span class="p">,</span><span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff">unifyTest</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">UnifyTestResult</span></span><span class="p"><span class="idiff">(</span></span><span class="o" style="font-weight: 600;"><span class="idiff">..</span></span><span class="p"><span class="idiff right">),</span></span></span>
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8
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="haskell"> <span class="n" style="color: #333;">makeSuperClasses</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC9" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">StopOrContinue</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="n" style="color: #333;">stopWith</span><span class="p">,</span> <span class="n" style="color: #333;">continueWith</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">StopOrContinue</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="n" style="color: #333;">stopWith</span><span class="p">,</span> <span class="n" style="color: #333;">continueWith</span><span class="p">,</span><span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff">andWhenContinue</span></span><span class="p"><span class="idiff right">,</span></span></span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="haskell"> <span class="n" style="color: #333;">solveCallStack</span> <span class="c1" style="color: #998; font-style: italic;">-- For GHC.Tc.Solver</span></span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="haskell"> <span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -51,7 +51,8 @@ import GHC.Data.Bag</td>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Monad</span></span>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Monad</span></span>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Maybe</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">isJust</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isNothing</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC54" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.List</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">zip4</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC54" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.List</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">zip4</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">partition</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC55" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Unique.Set</span><span class="p">(</span> <span class="n" style="color: #333;">nonDetEltsUniqSet</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Basic</span></span>
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<pre style="margin: 0;"> <span id="LC57" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC58" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Bifunctor</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">bimap</span> <span class="p">)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2246,10 +2247,10 @@ canEqCanLHS2 ev eq_rel swapped lhs1 ps_xi1 lhs2 ps_xi2 mco</td>
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2246
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2247
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<pre style="margin: 0;"> <span id="LC2247" class="line" lang="haskell"></span>
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2248
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<pre style="margin: 0;"> <span id="LC2248" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If we have F a ~ F (F a), we want to swap.</span></span>
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2248
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2249
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<pre style="margin: 0;"> <span id="LC2249" class="line" lang="haskell"> <span class="n" style="color: #333;">swap_for_occurs</span></span>
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<pre style="margin: 0;">-<span id="LC2249" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">MTVU_OK</span></span><span class="idiff"> </span><span class="nb" style="color: #0086b3;"><span class="idiff right">()</span></span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkTyFamEq</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">fun_tc2</span> <span class="n" style="color: #333;">fun_args2</span></span>
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2250
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<pre style="margin: 0;">-<span id="LC2250" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="p">(</span><span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">fun_tc1</span> <span class="n" style="color: #333;">fun_args1</span><span class="p">)</span></span>
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2251
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<pre style="margin: 0;">-<span id="LC2251" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">MTVU</span>_Occurs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkTyFamEq</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">fun_tc1</span> <span class="n" style="color: #333;">fun_args1</span></span>
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2252
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<pre style="margin: 0;">-<span id="LC2252" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="p">(</span><span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">fun_tc2</span> <span class="n" style="color: #333;">fun_args2</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2250" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">CTE_OK</span></span><span class="idiff right"> </span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkTyFamEq</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">fun_tc2</span> <span class="n" style="color: #333;">fun_args2</span></span>
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2251
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<pre style="margin: 0;">+<span id="LC2251" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">fun_tc1</span> <span class="n" style="color: #333;">fun_args1</span><span class="p">)</span></span>
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2252
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<pre style="margin: 0;">+<span id="LC2252" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CTE</span>_Occurs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkTyFamEq</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">fun_tc1</span> <span class="n" style="color: #333;">fun_args1</span></span>
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2253
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<pre style="margin: 0;">+<span id="LC2253" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">fun_tc2</span> <span class="n" style="color: #333;">fun_args2</span><span class="p">)</span></span>
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2253
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2254
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<pre style="margin: 0;"> <span id="LC2254" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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2255
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<pre style="margin: 0;"> <span id="LC2255" class="line" lang="haskell"></span>
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2256
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<pre style="margin: 0;"> <span id="LC2256" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2274,8 +2275,8 @@ canEqCanLHS2 ev eq_rel swapped lhs1 ps_xi1 lhs2 ps_xi2 mco</td>
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<pre style="margin: 0;"> <span id="LC2275" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2276" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This function handles the case where one side is a tyvar and the other is</span></span>
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<pre style="margin: 0;"> <span id="LC2277" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- a type family application. Which to put on the left?</span></span>
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<pre style="margin: 0;">-<span id="LC2277" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If <span class="idiff left right">we can unify the variable, put it on the left, as this may be our onl</span>y</span></span>
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<pre style="margin: 0;">-<span id="LC2278" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- shot to unify.</span></span>
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<pre style="margin: 0;">+<span id="LC2278" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If <span class="idiff left right">the tyvar is a touchable meta-tyvar, put it on the left, as this ma</span>y</span></span>
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<pre style="margin: 0;">+<span id="LC2279" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">be our only </span>shot to unify.</span></span>
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<pre style="margin: 0;"> <span id="LC2280" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Otherwise, put the function on the left, because it's generally better to</span></span>
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<pre style="margin: 0;"> <span id="LC2281" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- rewrite away function calls. This makes types smaller. And it seems necessary:</span></span>
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<pre style="margin: 0;"> <span id="LC2282" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- [W] F alpha ~ alpha</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2283,22 +2284,20 @@ canEqCanLHS2 ev eq_rel swapped lhs1 ps_xi1 lhs2 ps_xi2 mco</td>
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<pre style="margin: 0;"> <span id="LC2284" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- [W] G alpha beta ~ Int ( where we have type instance G a a = a )</span></span>
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<pre style="margin: 0;"> <span id="LC2285" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If we end up with a stuck alpha ~ F alpha, we won't be able to solve this.</span></span>
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<pre style="margin: 0;"> <span id="LC2286" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Test case: indexed-types/should_compile/CEqCanOccursCheck</span></span>
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<pre style="margin: 0;">-<span id="LC2286" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- It would probably work to always put the variable on the left, but we think</span></span>
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<pre style="margin: 0;">-<span id="LC2287" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- it would be less efficient.</span></span>
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<pre style="margin: 0;"> <span id="LC2287" class="line" lang="haskell"><span class="n" style="color: #333;">canEqTyVarFunEq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span> <span class="c1" style="color: #998; font-style: italic;">-- :: lhs ~ (rhs |> mco)</span></span>
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<pre style="margin: 0;"> <span id="LC2288" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- or (rhs |> mco) ~ lhs if swapped</span></span>
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<pre style="margin: 0;"> <span id="LC2289" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">EqRel</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SwapFlag</span></span>
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<pre style="margin: 0;">-<span id="LC2291" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="c1" style="color: #998; font-style: italic;">-- lhs, pretty lhs</span></span>
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<pre style="margin: 0;">-<span id="LC2292" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Xi</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="c1" style="color: #998; font-style: italic;">-- rhs <span class="idiff left right">fun, rhs</span> args, pretty rhs</span></span>
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<pre style="margin: 0;">+<span id="LC2290" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="c1" style="color: #998; font-style: italic;">-- lhs<span class="idiff left right"> (or if swapped rhs)</span>, pretty lhs</span></span>
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<pre style="margin: 0;">+<span id="LC2291" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Xi</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="c1" style="color: #998; font-style: italic;">-- rhs <span class="idiff left right">(or if swapped lhs) fun and</span> args, pretty rhs</span></span>
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<pre style="margin: 0;"> <span id="LC2292" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MCoercion</span> <span class="c1" style="color: #998; font-style: italic;">-- :: kind(rhs) ~N kind(lhs)</span></span>
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<pre style="margin: 0;"> <span id="LC2293" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StopOrContinue</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2294" class="line" lang="haskell"><span class="n" style="color: #333;">canEqTyVarFunEq</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">eq_rel</span> <span class="n" style="color: #333;">swapped</span> <span class="n" style="color: #333;">tv1</span> <span class="n" style="color: #333;">ps_xi1</span> <span class="n" style="color: #333;">fun_tc2</span> <span class="n" style="color: #333;">fun_args2</span> <span class="n" style="color: #333;">ps_xi2</span> <span class="n" style="color: #333;">mco</span></span>
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<pre style="margin: 0;">-<span id="LC2296" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;"><span class="idiff left">tclvl</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">getTcLevel</span></span></span>
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<pre style="margin: 0;">-<span id="LC2297" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getDynFlags</span></span>
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<pre style="margin: 0;">-<span id="LC2298" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">if</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;"><span class="idiff left">isTouchableMetaTyVar</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tclvl</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">tv1</span></span></span>
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<pre style="margin: 0;">-<span id="LC2299" class="line" lang="haskell"> <span class="idiff left"> </span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">MTVU_OK</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">checkTyVarEq</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">dflags</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">YesTypeFamilies</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tv1</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">ps_xi2</span></span><span class="idiff"> </span><span class="p"><span class="idiff">`</span></span><span class="n" style="color: #333;"><span class="idiff">mkCastTyMCo</span></span><span class="p"><span class="idiff">`</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">mco</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">-<span id="LC2300" class="line" lang="haskell"> <span class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">canEqCanLHSFinish</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ev</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">eq_rel</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">swapped</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TyVarLHS</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tv1</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">-<span id="LC2301" class="line" lang="haskell"><span class="idiff left"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">ps_xi2</span></span><span class="idiff"> </span><span class="p"><span class="idiff">`</span></span><span class="n" style="color: #333;"><span class="idiff">mkCastTyMCo</span></span><span class="p"><span class="idiff">`</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">mco</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC2295" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;"><span class="idiff left">can_unify</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">unifyTest</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ev</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tv1</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">rhs</span></span></span>
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<pre style="margin: 0;">+<span id="LC2296" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">dflags</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getDynFlags</span></span>
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<pre style="margin: 0;">+<span id="LC2297" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">if</span> <span class="o" style="font-weight: 600;">|</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">case</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">can_unify</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">of</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NoUnify</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">False</span></span><span class="p"><span class="idiff">;</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">True</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">}</span></span></span>
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<pre style="margin: 0;">+<span id="LC2298" class="line" lang="haskell"> <span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">CTE_OK</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">checkTyVarEq</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">dflags</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">YesTypeFamilies</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tv1</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">rhs</span></span></span>
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<pre style="margin: 0;">+<span id="LC2299" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><span class="idiff left">-></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">canEqCanLHSFinish</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ev</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">eq_rel</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">swapped</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TyVarLHS</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tv1</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">rhs</span></span></span>
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<pre style="margin: 0;">+<span id="LC2300" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2301" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<pre style="margin: 0;"> <span id="LC2302" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">new_ev</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rewriteCastedEquality</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">eq_rel</span> <span class="n" style="color: #333;">swapped</span></span>
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<pre style="margin: 0;"> <span id="LC2303" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">tv1</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">fun_tc2</span> <span class="n" style="color: #333;">fun_args2</span><span class="p">)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2308,6 +2307,82 @@ canEqTyVarFunEq ev eq_rel swapped tv1 ps_xi1 fun_tc2 fun_args2 ps_xi2 mco</td>
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2308
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<pre style="margin: 0;"> <span id="LC2307" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ps_xi1</span> <span class="p">`</span><span class="n" style="color: #333;">mkCastTyMCo</span><span class="p">`</span> <span class="n" style="color: #333;">sym_mco</span><span class="p">)</span> <span class="p">}</span> <span class="p">}</span></span>
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2309
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2308
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<pre style="margin: 0;"> <span id="LC2308" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2310
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2309
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<pre style="margin: 0;"> <span id="LC2309" class="line" lang="haskell"> <span class="n" style="color: #333;">sym_mco</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTcSymMCo</span> <span class="n" style="color: #333;">mco</span></span>
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<pre style="margin: 0;">+<span id="LC2310" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ps_xi2</span> <span class="p">`</span><span class="n" style="color: #333;">mkCastTyMCo</span><span class="p">`</span> <span class="n" style="color: #333;">mco</span></span>
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2311
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<pre style="margin: 0;">+<span id="LC2311" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2312" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">UnifyTestResult</span></span>
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<pre style="margin: 0;">+<span id="LC2313" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Solve by unification] in GHC.Tc.Solver.Interact</span></span>
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2314
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<pre style="margin: 0;">+<span id="LC2314" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- which points out that having UnifySameLevel is just an optimisation;</span></span>
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<pre style="margin: 0;">+<span id="LC2315" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we could manage with UnifyOuterLevel alone (suitably renamed)</span></span>
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<pre style="margin: 0;">+<span id="LC2316" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">UnifySameLevel</span></span>
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<pre style="margin: 0;">+<span id="LC2317" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">UnifyOuterLevel</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- Promote these</span></span>
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<pre style="margin: 0;">+<span id="LC2318" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TcLevel</span> <span class="c1" style="color: #998; font-style: italic;">-- ..to this level</span></span>
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<pre style="margin: 0;">+<span id="LC2319" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">NoUnify</span></span>
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<pre style="margin: 0;">+<span id="LC2320" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2321" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">UnifyTestResult</span> <span class="kr" style="font-weight: 600;">where</span></span>
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2322
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<pre style="margin: 0;">+<span id="LC2322" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">UnifySameLevel</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"UnifySameLevel"</span></span>
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2323
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<pre style="margin: 0;">+<span id="LC2323" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UnifyOuterLevel</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">lvl</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"UnifyOuterLevel"</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">parens</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">lvl</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tvs</span><span class="p">)</span></span>
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2324
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<pre style="margin: 0;">+<span id="LC2324" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">NoUnify</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"NoUnify"</span></span>
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2325
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<pre style="margin: 0;">+<span id="LC2325" class="line" lang="haskell"></span>
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2326
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<pre style="margin: 0;">+<span id="LC2326" class="line" lang="haskell"><span class="n" style="color: #333;">unifyTest</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="kt" style="color: #458; font-weight: 600;">UnifyTestResult</span></span>
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2327
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<pre style="margin: 0;">+<span id="LC2327" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This is the key test for untouchability:</span></span>
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2328
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<pre style="margin: 0;">+<span id="LC2328" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Unification preconditions] in GHC.Tc.Utils.Unify</span></span>
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2329
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<pre style="margin: 0;">+<span id="LC2329" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- and Note [Solve by unification] in GHC.Tc.Solver.Interact</span></span>
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2330
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<pre style="margin: 0;">+<span id="LC2330" class="line" lang="haskell"><span class="n" style="color: #333;">unifyTest</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">tv1</span> <span class="n" style="color: #333;">rhs</span></span>
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2331
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<pre style="margin: 0;">+<span id="LC2331" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isGiven</span> <span class="n" style="color: #333;">ev</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Do not unify Givens]</span></span>
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2332
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<pre style="margin: 0;">+<span id="LC2332" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">MetaTv</span> <span class="p">{</span> <span class="n" style="color: #333;">mtv_tclvl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tv_lvl</span><span class="p">,</span> <span class="n" style="color: #333;">mtv_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">info</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcTyVarDetails</span> <span class="n" style="color: #333;">tv1</span></span>
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2333
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<pre style="margin: 0;">+<span id="LC2333" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">canSolveByUnification</span> <span class="n" style="color: #333;">info</span> <span class="n" style="color: #333;">rhs</span></span>
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2334
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<pre style="margin: 0;">+<span id="LC2334" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">ambient_lvl</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getTcLevel</span></span>
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2335
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<pre style="margin: 0;">+<span id="LC2335" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">given_eq_lvl</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getInnermostGivenEqLevel</span></span>
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2336
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<pre style="margin: 0;">+<span id="LC2336" class="line" lang="haskell"></span>
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2337
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<pre style="margin: 0;">+<span id="LC2337" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">if</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">tv_lvl</span> <span class="p">`</span><span class="n" style="color: #333;">sameDepthAs</span><span class="p">`</span> <span class="n" style="color: #333;">ambient_lvl</span></span>
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2338
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<pre style="margin: 0;">+<span id="LC2338" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">UnifySameLevel</span></span>
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2339
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<pre style="margin: 0;">+<span id="LC2339" class="line" lang="haskell"></span>
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2340
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<pre style="margin: 0;">+<span id="LC2340" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">tv_lvl</span> <span class="p">`</span><span class="n" style="color: #333;">deeperThanOrSame</span><span class="p">`</span> <span class="n" style="color: #333;">given_eq_lvl</span> <span class="c1" style="color: #998; font-style: italic;">-- No intervening given equalities</span></span>
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2341
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<pre style="margin: 0;">+<span id="LC2341" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">all</span> <span class="p">(</span><span class="n" style="color: #333;">does_not_escape</span> <span class="n" style="color: #333;">tv_lvl</span><span class="p">)</span> <span class="n" style="color: #333;">free_skols</span> <span class="c1" style="color: #998; font-style: italic;">-- No skolem escapes</span></span>
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2342
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<pre style="margin: 0;">+<span id="LC2342" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UnifyOuterLevel</span> <span class="n" style="color: #333;">free_metas</span> <span class="n" style="color: #333;">tv_lvl</span><span class="p">)</span></span>
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2343
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<pre style="margin: 0;">+<span id="LC2343" class="line" lang="haskell"></span>
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2344
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<pre style="margin: 0;">+<span id="LC2344" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2345" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2345
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<pre style="margin: 0;">+<span id="LC2345" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">NoUnify</span> <span class="p">}</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2346" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2346
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<pre style="margin: 0;">+<span id="LC2346" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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2347
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<pre style="margin: 0;">+<span id="LC2347" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">NoUnify</span></span>
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2348
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<pre style="margin: 0;">+<span id="LC2348" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2349
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<pre style="margin: 0;">+<span id="LC2349" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">free_metas</span><span class="p">,</span> <span class="n" style="color: #333;">free_skols</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">partition</span> <span class="n" style="color: #333;">isPromotableMetaTyVar</span> <span class="o" style="font-weight: 600;">$</span></span>
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2350
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<pre style="margin: 0;">+<span id="LC2350" class="line" lang="haskell"> <span class="n" style="color: #333;">nonDetEltsUniqSet</span> <span class="o" style="font-weight: 600;">$</span></span>
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2351
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<pre style="margin: 0;">+<span id="LC2351" class="line" lang="haskell"> <span class="n" style="color: #333;">tyCoVarsOfType</span> <span class="n" style="color: #333;">rhs</span></span>
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2352
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<pre style="margin: 0;">+<span id="LC2352" class="line" lang="haskell"></span>
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2353
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<pre style="margin: 0;">+<span id="LC2353" class="line" lang="haskell"> <span class="n" style="color: #333;">does_not_escape</span> <span class="n" style="color: #333;">tv_lvl</span> <span class="n" style="color: #333;">fv</span></span>
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2354
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<pre style="margin: 0;">+<span id="LC2354" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTyVar</span> <span class="n" style="color: #333;">fv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tv_lvl</span> <span class="p">`</span><span class="n" style="color: #333;">deeperThanOrSame</span><span class="p">`</span> <span class="n" style="color: #333;">tcTyVarLevel</span> <span class="n" style="color: #333;">fv</span></span>
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2355
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<pre style="margin: 0;">+<span id="LC2355" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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2356
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<pre style="margin: 0;">+<span id="LC2356" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Coercion variables are not an escape risk</span></span>
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2357
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<pre style="margin: 0;">+<span id="LC2357" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If an implication binds a coercion variable, it'll have equalities,</span></span>
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2358
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<pre style="margin: 0;">+<span id="LC2358" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- so the "intervening given equalities" test above will catch it</span></span>
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2359
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<pre style="margin: 0;">+<span id="LC2359" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Coercion holes get filled with coercions, so again no problem.</span></span>
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2360
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<pre style="margin: 0;">+<span id="LC2360" class="line" lang="haskell"></span>
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2361
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<pre style="margin: 0;">+<span id="LC2361" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Do not unify Givens]</span></span>
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2362
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<pre style="margin: 0;">+<span id="LC2362" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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2363
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<pre style="margin: 0;">+<span id="LC2363" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider this GADT match</span></span>
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2364
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<pre style="margin: 0;">+<span id="LC2364" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T a where</span></span>
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2365
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<pre style="margin: 0;">+<span id="LC2365" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> T1 :: T Int</span></span>
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2366
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<pre style="margin: 0;">+<span id="LC2366" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ...</span></span>
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2367
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<pre style="margin: 0;">+<span id="LC2367" class="line" lang="haskell"></span>
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2368
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<pre style="margin: 0;">+<span id="LC2368" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f x = case x of</span></span>
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2369
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<pre style="margin: 0;">+<span id="LC2369" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> T1 -> True</span></span>
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<pre style="margin: 0;">+<span id="LC2370" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ...</span></span>
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2371
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<pre style="margin: 0;">+<span id="LC2371" class="line" lang="haskell"></span>
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2372
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<pre style="margin: 0;">+<span id="LC2372" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So we get f :: T alpha[1] -> beta[1]</span></span>
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2373
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<pre style="margin: 0;">+<span id="LC2373" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> x :: T alpha[1]</span></span>
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2374
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<pre style="margin: 0;">+<span id="LC2374" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and from the T1 branch we get the implication</span></span>
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2375
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<pre style="margin: 0;">+<span id="LC2375" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> forall[2] (alpha[1] ~ Int) => beta[1] ~ Bool</span></span>
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2376
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<pre style="margin: 0;">+<span id="LC2376" class="line" lang="haskell"></span>
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2377
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<pre style="margin: 0;">+<span id="LC2377" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Now, clearly we don't want to unify alpha:=Int! Yet at the moment we</span></span>
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2378
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<pre style="margin: 0;">+<span id="LC2378" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">process [G] alpha[1] ~ Int, we don't have any given-equalities in the</span></span>
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2379
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<pre style="margin: 0;">+<span id="LC2379" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">inert set, and hence there are no given equalities to make alpha untouchable.</span></span>
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2380
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<pre style="margin: 0;">+<span id="LC2380" class="line" lang="haskell"></span>
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2381
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<pre style="margin: 0;">+<span id="LC2381" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(NB: if it were alpha[2] ~ Int, this argument wouldn't hold. But that</span></span>
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2382
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<pre style="margin: 0;">+<span id="LC2382" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">almost never happens, and will never happen at all if we cure #18929.)</span></span>
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2383
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<pre style="margin: 0;">+<span id="LC2383" class="line" lang="haskell"></span>
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2384
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<pre style="margin: 0;">+<span id="LC2384" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Simple solution: never unify in Givens!</span></span>
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2385
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<pre style="margin: 0;">+<span id="LC2385" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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2311
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2386
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<pre style="margin: 0;"> <span id="LC2386" class="line" lang="haskell"></span>
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2312
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2387
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<pre style="margin: 0;"> <span id="LC2387" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The RHS here is either not CanEqLHS, or it's one that we</span></span>
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2313
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2388
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<pre style="margin: 0;"> <span id="LC2388" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- want to rewrite the LHS to (as per e.g. swapOverTyVars)</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2427" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2427,11 +2502,11 @@ canEqOK :: DynFlags -> EqRel -> CanEqLHS -> Xi -> CanEqOK</td>
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2427
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2502
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<pre style="margin: 0;"> <span id="LC2502" class="line" lang="haskell"><span class="n" style="color: #333;">canEqOK</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">eq_rel</span> <span class="n" style="color: #333;">lhs</span> <span class="n" style="color: #333;">rhs</span></span>
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2428
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2503
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<pre style="margin: 0;"> <span id="LC2503" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">good_rhs</span> <span class="p">)</span></span>
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2429
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2504
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<pre style="margin: 0;"> <span id="LC2504" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">checkTypeEq</span> <span class="n" style="color: #333;">dflags</span> <span class="kt" style="color: #458; font-weight: 600;">YesTypeFamilies</span> <span class="n" style="color: #333;">lhs</span> <span class="n" style="color: #333;">rhs</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2430
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<pre style="margin: 0;">-<span id="LC2430" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">MTVU_OK</span></span><span class="idiff"> </span><span class="nb" style="color: #0086b3;"><span class="idiff">()</span></span><span class="idiff right"> </span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CanEqOK</span></span>
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2431
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<pre style="margin: 0;">-<span id="LC2431" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">MTVU_Bad</span></span><span class="idiff right"> </span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CanEqNotOK</span> <span class="kt" style="color: #458; font-weight: 600;">OtherCIS</span></span>
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2505
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<pre style="margin: 0;">+<span id="LC2505" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CTE_OK</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CanEqOK</span></span>
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2506
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<pre style="margin: 0;">+<span id="LC2506" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CTE_Bad</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CanEqNotOK</span> <span class="kt" style="color: #458; font-weight: 600;">OtherCIS</span></span>
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2432
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2507
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<pre style="margin: 0;"> <span id="LC2507" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Violation of TyEq:F</span></span>
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2433
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2508
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<pre style="margin: 0;"> <span id="LC2508" class="line" lang="haskell"></span>
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2434
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<pre style="margin: 0;">-<span id="LC2434" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">MTVU</span>_HoleBlocker</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CanEqNotOK</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">BlockedCIS</span> <span class="n" style="color: #333;">holes</span><span class="p">)</span></span>
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2509
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<pre style="margin: 0;">+<span id="LC2509" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CTE</span>_HoleBlocker</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CanEqNotOK</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">BlockedCIS</span> <span class="n" style="color: #333;">holes</span><span class="p">)</span></span>
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2435
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2510
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<pre style="margin: 0;"> <span id="LC2510" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">holes</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">coercionHolesOfType</span> <span class="n" style="color: #333;">rhs</span></span>
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2436
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2511
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<pre style="margin: 0;"> <span id="LC2511" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This is the case detailed in</span></span>
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2437
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2512
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<pre style="margin: 0;"> <span id="LC2512" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Equalities with incompatible kinds]</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2440" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2515" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2440,7 +2515,7 @@ canEqOK dflags eq_rel lhs rhs</td>
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2440
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2515
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<pre style="margin: 0;"> <span id="LC2515" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- These are both a violation of TyEq:OC, but we</span></span>
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2441
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2516
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<pre style="margin: 0;"> <span id="LC2516" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- want to differentiate for better production of</span></span>
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2442
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2517
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<pre style="margin: 0;"> <span id="LC2517" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- error messages</span></span>
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2443
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<pre style="margin: 0;">-<span id="LC2443" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">MTVU</span>_Occurs</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">TyVarLHS</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lhs</span></span>
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2518
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<pre style="margin: 0;">+<span id="LC2518" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CTE</span>_Occurs</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">TyVarLHS</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lhs</span></span>
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2444
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2519
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<pre style="margin: 0;"> <span id="LC2519" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">isInsolubleOccursCheck</span> <span class="n" style="color: #333;">eq_rel</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">rhs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CanEqNotOK</span> <span class="kt" style="color: #458; font-weight: 600;">InsolubleCIS</span></span>
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2445
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2520
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<pre style="margin: 0;"> <span id="LC2520" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If we have a ~ [a], it is not canonical, and in particular</span></span>
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2446
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2521
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<pre style="margin: 0;"> <span id="LC2521" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we don't want to rewrite existing inerts with it, otherwise</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4f85f14177d0b2be1c1489bc69ad4f69372e1fb4#f639b0b31b7245cb7d34ac190b798f5ec1c7da2e"><strong>compiler/GHC/Tc/Solver/Interact.hs</strong></a>
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<pre style="margin: 0;">-<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE CPP #-}</span></span>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE CPP<span class="idiff left right">, MultiWayIf</span> #-}</span></span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# OPTIONS_GHC -Wno-incomplete-record-updates #-}</span></span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# OPTIONS_GHC -Wno-incomplete-uni-patterns #-}</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -14,7 +14,6 @@ import GHC.Prelude</td>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Basic</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">SwapFlag</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">infinity</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">IntWithInf</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">intGtLimit</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Solver.Canonical</span></span>
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<pre style="margin: 0;">-<span id="LC17" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Unify</span><span class="p">(</span> <span class="n" style="color: #333;">canSolveByUnification</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var.Set</span></span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Type</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">Type</span></span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.InstEnv</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">DFunInstType</span> <span class="p">)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -39,6 +38,7 @@ import GHC.Tc.Types</td>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types.Constraint</span></span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Predicate</span></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types.Origin</span></span>
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<pre style="margin: 0;">+<span id="LC41" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.TcMType</span><span class="p">(</span> <span class="n" style="color: #333;">promoteMetaTyVarTo</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Solver.Monad</span></span>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.Bag</span></span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Monad</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">concatMapM</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">foldlM</span> <span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="106" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -106,8 +106,6 @@ solveSimpleGivens givens</td>
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<pre style="margin: 0;"> <span id="LC106" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">new_givens</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC107" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC108" class="line" lang="haskell"><span class="n" style="color: #333;">solveSimpleWanteds</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Cts</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span></span>
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<pre style="margin: 0;">-<span id="LC109" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- NB: 'simples' may contain /derived/ equalities, floated</span></span>
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<pre style="margin: 0;">-<span id="LC110" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- out from a nested implication. So don't discard deriveds!</span></span>
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<pre style="margin: 0;"> <span id="LC109" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The result is not necessarily zonked</span></span>
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<pre style="margin: 0;"> <span id="LC110" class="line" lang="haskell"><span class="n" style="color: #333;">solveSimpleWanteds</span> <span class="n" style="color: #333;">simples</span></span>
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<pre style="margin: 0;"> <span id="LC111" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"solveSimpleWanteds {"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">simples</span><span class="p">)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -430,12 +428,11 @@ interactWithInertsStage :: WorkItem -> TcS (StopOrContinue Ct)</td>
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<pre style="margin: 0;"> <span id="LC428" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC429" class="line" lang="haskell"><span class="n" style="color: #333;">interactWithInertsStage</span> <span class="n" style="color: #333;">wi</span></span>
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<pre style="margin: 0;"> <span id="LC430" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">inerts</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getTcSInerts</span></span>
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<pre style="margin: 0;">-<span id="LC433" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">lvl</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getTcLevel</span></span>
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<pre style="margin: 0;"> <span id="LC431" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ics</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">inert_cans</span> <span class="n" style="color: #333;">inerts</span></span>
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<pre style="margin: 0;"> <span id="LC432" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">wi</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC436" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CEqCan</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">interactEq</span> <span class="n" style="color: #333;"><span class="idiff left right">lvl</span></span> <span class="n" style="color: #333;">ics</span> <span class="n" style="color: #333;">wi</span></span>
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<pre style="margin: 0;">-<span id="LC437" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CIrredCan</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">interactIrred</span> <span class="idiff left right"> </span><span class="n" style="color: #333;">ics</span> <span class="n" style="color: #333;">wi</span></span>
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<pre style="margin: 0;">-<span id="LC438" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CDictCan</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">interactDict</span> <span class="idiff left right"> </span><span class="n" style="color: #333;">ics</span> <span class="n" style="color: #333;">wi</span></span>
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<pre style="margin: 0;">+<span id="LC433" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CEqCan</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">interactEq</span> <span class="idiff left right"> </span> <span class="n" style="color: #333;">ics</span> <span class="n" style="color: #333;">wi</span></span>
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<pre style="margin: 0;">+<span id="LC434" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CIrredCan</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">interactIrred</span> <span class="n" style="color: #333;">ics</span> <span class="n" style="color: #333;">wi</span></span>
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<pre style="margin: 0;">+<span id="LC435" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CDictCan</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">interactDict</span> <span class="n" style="color: #333;">ics</span> <span class="n" style="color: #333;">wi</span></span>
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<pre style="margin: 0;"> <span id="LC436" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"interactWithInerts"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">wi</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC437" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- CNonCanonical have been canonicalised</span></span>
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<pre style="margin: 0;"> <span id="LC438" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -734,25 +731,26 @@ Example of (b): assume a top-level class and instance declaration:</td>
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<pre style="margin: 0;"> <span id="LC731" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC732" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Assume we have started with an implication:</span></span>
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<pre style="margin: 0;"> <span id="LC733" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC737" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> forall c. Eq c => { wc_simple = <span class="idiff left right">D [c] c [W]</span> }</span></span>
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<pre style="margin: 0;">+<span id="LC734" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> forall c. Eq c => { wc_simple = <span class="idiff left right">[W] D [c] c</span> }</span></span>
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<pre style="margin: 0;"> <span id="LC735" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC739" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">which we have simplified to:</span></span>
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<pre style="margin: 0;">+<span id="LC736" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">which we have simplified to, with a Derived constraing coming from</span></span>
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<pre style="margin: 0;">+<span id="LC737" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">D's functional dependency:</span></span>
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<pre style="margin: 0;"> <span id="LC738" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC741" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> forall c. Eq c => { wc_simple = D [c] c [W]</span></span>
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<pre style="margin: 0;">-<span id="LC742" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">(c ~ [c]) [D]</span> }</span></span>
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<pre style="margin: 0;">+<span id="LC739" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> forall c. Eq c => { wc_simple = <span class="idiff left right">[W] </span>D [c] c [W]</span></span>
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<pre style="margin: 0;">+<span id="LC740" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">[D] (c ~ [c])</span> }</span></span>
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<pre style="margin: 0;"> <span id="LC741" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC744" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For some reason, e.g. because we floated an equality somewhere else,</span></span>
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<pre style="margin: 0;">-<span id="LC745" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we might try to re-solve this implication. If we do not do a</span></span>
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<pre style="margin: 0;">-<span id="LC746" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">dropDerivedWC, then we will end up trying to solve the following</span></span>
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<pre style="margin: 0;">-<span id="LC747" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">constraints the second time:</span></span>
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<pre style="margin: 0;">+<span id="LC742" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">When iterating the solver, we might try to re-solve this</span></span>
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<pre style="margin: 0;">+<span id="LC743" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">implication. If we do not do a dropDerivedWC, then we will end up</span></span>
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<pre style="margin: 0;">+<span id="LC744" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">trying to solve the following constraints the second time:</span></span>
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<pre style="margin: 0;"> <span id="LC745" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC749" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">(D [c] c) [W]</span></span></span>
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<pre style="margin: 0;">-<span id="LC750" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">(c ~ [c]) [D]</span></span></span>
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<pre style="margin: 0;">+<span id="LC746" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">[W] (D [c] c)</span></span></span>
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<pre style="margin: 0;">+<span id="LC747" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">[D] (c ~ [c])</span></span></span>
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<pre style="margin: 0;"> <span id="LC748" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC749" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">which will result in two Deriveds to end up in the insoluble set:</span></span>
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<pre style="margin: 0;"> <span id="LC750" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC754" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> wc_simple = D [c] c [W]</span></span>
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<pre style="margin: 0;">-<span id="LC755" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (c ~ [c]) [D], (c ~ [c]) [D]</span></span>
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<pre style="margin: 0;">+<span id="LC751" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> wc_simple = [W] D [c] c</span></span>
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<pre style="margin: 0;">+<span id="LC752" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [D] (c ~ [c])</span></span>
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<pre style="margin: 0;">+<span id="LC753" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [D] (c ~ [c])</span></span>
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<pre style="margin: 0;"> <span id="LC754" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;"> <span id="LC755" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC756" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1439,8 +1437,8 @@ inertsCanDischarge inerts lhs rhs fr</td>
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<pre style="margin: 0;"> <span id="LC1437" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<pre style="margin: 0;"> <span id="LC1438" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="c1" style="color: #998; font-style: italic;">-- Work item is fully discharged</span></span>
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<pre style="margin: 0;"> <span id="LC1439" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1442" class="line" lang="haskell"><span class="n" style="color: #333;">interactEq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">TcLevel</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff right"> </span><span class="kt" style="color: #458; font-weight: 600;">InertCans</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StopOrContinue</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1443" class="line" lang="haskell"><span class="n" style="color: #333;">interactEq</span> <span class="n" style="color: #333;"><span class="idiff left">tclvl</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">inerts</span> <span class="n" style="color: #333;">workItem</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CEqCan</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lhs</span></span>
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<pre style="margin: 0;">+<span id="LC1440" class="line" lang="haskell"><span class="n" style="color: #333;">interactEq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">InertCans</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StopOrContinue</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1441" class="line" lang="haskell"><span class="n" style="color: #333;">interactEq</span> <span class="n" style="color: #333;">inerts</span> <span class="n" style="color: #333;">workItem</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CEqCan</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lhs</span></span>
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<pre style="margin: 0;"> <span id="LC1442" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cc_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs</span></span>
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1443
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<pre style="margin: 0;"> <span id="LC1443" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cc_ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ev</span></span>
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1446
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1444
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<pre style="margin: 0;"> <span id="LC1444" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cc_eq_rel</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eq_rel</span> <span class="p">})</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1463" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1465,24 +1463,43 @@ interactEq tclvl inerts workItem@(CEqCan { cc_lhs = lhs</td>
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1465
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1463
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<pre style="margin: 0;"> <span id="LC1463" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"Not unifying representational equality"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">workItem</span><span class="p">)</span></span>
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1466
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1464
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<pre style="margin: 0;"> <span id="LC1464" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">continueWith</span> <span class="n" style="color: #333;">workItem</span> <span class="p">}</span></span>
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1467
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1465
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<pre style="margin: 0;"> <span id="LC1465" class="line" lang="haskell"></span>
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1468
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<pre style="margin: 0;">-<span id="LC1468" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- try improvement, if possible</span></span>
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1469
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<pre style="margin: 0;">-<span id="LC1469" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">TyFamLHS</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">fam_args</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lhs</span></span>
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1470
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<pre style="margin: 0;">-<span id="LC1470" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">isImprovable</span> <span class="n" style="color: #333;">ev</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1471" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1471
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<pre style="margin: 0;">-<span id="LC1471" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">improveLocalFunEqs</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">inerts</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">fam_args</span> <span class="n" style="color: #333;">rhs</span></span>
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1472
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<pre style="margin: 0;">-<span id="LC1472" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">continueWith</span> <span class="n" style="color: #333;">workItem</span> <span class="p">}</span></span>
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1473
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<pre style="margin: 0;">-<span id="LC1473" class="line" lang="haskell"></span>
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1474
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<pre style="margin: 0;">-<span id="LC1474" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">TyVarLHS</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lhs</span></span>
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1475
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<pre style="margin: 0;">-<span id="LC1475" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">canSolveByUnification</span> <span class="n" style="color: #333;">tclvl</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">rhs</span></span>
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1476
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<pre style="margin: 0;">-<span id="LC1476" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">solveByUnification</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">rhs</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1477" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1477
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<pre style="margin: 0;">-<span id="LC1477" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">n_kicked</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">kickOutAfterUnification</span> <span class="n" style="color: #333;">tv</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1478" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1478
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<pre style="margin: 0;">-<span id="LC1478" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Stop</span> <span class="n" style="color: #333;">ev</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Solved by unification"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pprKicked</span> <span class="n" style="color: #333;">n_kicked</span><span class="p">))</span> <span class="p">}</span></span>
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1479
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<pre style="margin: 0;">-<span id="LC1479" class="line" lang="haskell"></span>
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1480
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1466
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<pre style="margin: 0;"> <span id="LC1466" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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1481
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<pre style="margin: 0;">-<span id="LC1481" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">continueWith</span> <span class="n" style="color: #333;">workItem</span></span>
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1482
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<pre style="margin: 0;">-<span id="LC1482" class="line" lang="haskell"></span>
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1483
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<pre style="margin: 0;">-<span id="LC1483" class="line" lang="haskell"><span class="n" style="color: #333;">interactEq</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">wi</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"interactEq"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">wi</span><span class="p">)</span></span>
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1484
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<pre style="margin: 0;">-<span id="LC1484" class="line" lang="haskell"></span>
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1485
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<pre style="margin: 0;">-<span id="LC1485" class="line" lang="haskell"><span class="n" style="color: #333;">solveByUnification</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Xi</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1467
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<pre style="margin: 0;">+<span id="LC1467" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lhs</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1468
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<pre style="margin: 0;">+<span id="LC1468" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TyVarLHS</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">tryToSolveByUnification</span> <span class="n" style="color: #333;">workItem</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">rhs</span></span>
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1469
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<pre style="margin: 0;">+<span id="LC1469" class="line" lang="haskell"></span>
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1470
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<pre style="margin: 0;">+<span id="LC1470" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TyFamLHS</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">isImprovable</span> <span class="n" style="color: #333;">ev</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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1471
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<pre style="margin: 0;">+<span id="LC1471" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Try improvement, if possible</span></span>
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1472
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<pre style="margin: 0;">+<span id="LC1472" class="line" lang="haskell"> <span class="n" style="color: #333;">improveLocalFunEqs</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">inerts</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">args</span> <span class="n" style="color: #333;">rhs</span></span>
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1473
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<pre style="margin: 0;">+<span id="LC1473" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">continueWith</span> <span class="n" style="color: #333;">workItem</span> <span class="p">}</span></span>
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1474
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<pre style="margin: 0;">+<span id="LC1474" class="line" lang="haskell"></span>
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1475
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<pre style="margin: 0;">+<span id="LC1475" class="line" lang="haskell"><span class="n" style="color: #333;">interactEq</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">wi</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"interactEq"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">wi</span><span class="p">)</span></span>
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1476
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<pre style="margin: 0;">+<span id="LC1476" class="line" lang="haskell"></span>
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1477
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<pre style="margin: 0;">+<span id="LC1477" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">----------------------</span></span>
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1478
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<pre style="margin: 0;">+<span id="LC1478" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We have a meta-tyvar on the left, and metaTyVarUpateOK has said "yes"</span></span>
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1479
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<pre style="margin: 0;">+<span id="LC1479" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- So try to solve by unifying.</span></span>
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1480
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<pre style="margin: 0;">+<span id="LC1480" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Three reasons why not:</span></span>
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1481
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<pre style="margin: 0;">+<span id="LC1481" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Skolem escape</span></span>
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1482
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<pre style="margin: 0;">+<span id="LC1482" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Given equalities (GADTs)</span></span>
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1483
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<pre style="margin: 0;">+<span id="LC1483" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Unifying a TyVarTv with a non-tyvar type</span></span>
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1484
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<pre style="margin: 0;">+<span id="LC1484" class="line" lang="haskell"><span class="n" style="color: #333;">tryToSolveByUnification</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span></span>
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1485
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<pre style="margin: 0;">+<span id="LC1485" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span> <span class="c1" style="color: #998; font-style: italic;">-- LHS tyvar</span></span>
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<pre style="margin: 0;">+<span id="LC1486" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="c1" style="color: #998; font-style: italic;">-- RHS</span></span>
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<pre style="margin: 0;">+<span id="LC1487" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StopOrContinue</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span><span class="p">)</span></span>
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1488
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<pre style="margin: 0;">+<span id="LC1488" class="line" lang="haskell"><span class="n" style="color: #333;">tryToSolveByUnification</span> <span class="n" style="color: #333;">work_item</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">rhs</span></span>
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1489
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<pre style="margin: 0;">+<span id="LC1489" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">can_unify</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unifyTest</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">rhs</span></span>
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1490
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<pre style="margin: 0;">+<span id="LC1490" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"tryToSolveByUnification"</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">char</span> <span class="sc" style="color: #d14;">'~'</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">rhs</span></span>
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1491
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<pre style="margin: 0;">+<span id="LC1491" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">can_unify</span> <span class="p">])</span></span>
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1492
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<pre style="margin: 0;">+<span id="LC1492" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1493" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">can_unify</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1494
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<pre style="margin: 0;">+<span id="LC1494" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NoUnify</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">continueWith</span> <span class="n" style="color: #333;">work_item</span></span>
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<pre style="margin: 0;">+<span id="LC1495" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- For the latter two cases see Note [Solve by unification]</span></span>
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1496
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<pre style="margin: 0;">+<span id="LC1496" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">UnifySameLevel</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">solveByUnification</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">rhs</span></span>
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1497
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<pre style="margin: 0;">+<span id="LC1497" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">UnifyOuterLevel</span> <span class="n" style="color: #333;">free_metas</span> <span class="n" style="color: #333;">tv_lvl</span></span>
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1498
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<pre style="margin: 0;">+<span id="LC1498" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">wrapTcS</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mapM_</span> <span class="p">(</span><span class="n" style="color: #333;">promoteMetaTyVarTo</span> <span class="n" style="color: #333;">tv_lvl</span><span class="p">)</span> <span class="n" style="color: #333;">free_metas</span></span>
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1499
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<pre style="margin: 0;">+<span id="LC1499" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">setUnificationFlag</span> <span class="n" style="color: #333;">tv_lvl</span></span>
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1500
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<pre style="margin: 0;">+<span id="LC1500" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">solveByUnification</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">rhs</span> <span class="p">}</span> <span class="p">}</span></span>
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1501
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<pre style="margin: 0;">+<span id="LC1501" class="line" lang="haskell"></span>
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1502
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<pre style="margin: 0;">+<span id="LC1502" class="line" lang="haskell"><span class="n" style="color: #333;">solveByUnification</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Xi</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StopOrContinue</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span><span class="p">)</span></span>
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1486
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1503
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<pre style="margin: 0;"> <span id="LC1503" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Solve with the identity coercion</span></span>
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1487
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1504
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<pre style="margin: 0;"> <span id="LC1504" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Precondition: kind(xi) equals kind(tv)</span></span>
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1488
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1505
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<pre style="margin: 0;"> <span id="LC1505" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Precondition: CtEvidence is Wanted or Derived</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1504,9 +1521,10 @@ solveByUnification wd tv xi</td>
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1504
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1521
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<pre style="margin: 0;"> <span id="LC1521" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Coercion:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pprEq</span> <span class="n" style="color: #333;">tv_ty</span> <span class="n" style="color: #333;">xi</span><span class="p">,</span></span>
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1505
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1522
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<pre style="margin: 0;"> <span id="LC1522" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Left Kind is:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">tcTypeKind</span> <span class="n" style="color: #333;">tv_ty</span><span class="p">),</span></span>
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1506
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<td class="diff-line-num new_line" data-linenumber="1523" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1523
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<pre style="margin: 0;"> <span id="LC1523" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Right Kind is:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">tcTypeKind</span> <span class="n" style="color: #333;">xi</span><span class="p">)</span> <span class="p">]</span></span>
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1507
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<pre style="margin: 0;">-<span id="LC1507" class="line" lang="haskell"></span>
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1508
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1524
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<pre style="margin: 0;"> <span id="LC1524" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">unifyTyVar</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">xi</span></span>
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1509
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<pre style="margin: 0;">-<span id="LC1509" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">setEvBindIfWanted</span> <span class="n" style="color: #333;">wd</span> <span class="p">(</span><span class="n" style="color: #333;">evCoercion</span> <span class="p">(</span><span class="n" style="color: #333;">mkTcNomReflCo</span> <span class="n" style="color: #333;">xi</span><span class="p">))</span> <span class="p">}</span></span>
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1525
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<pre style="margin: 0;">+<span id="LC1525" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">setEvBindIfWanted</span> <span class="n" style="color: #333;">wd</span> <span class="p">(</span><span class="n" style="color: #333;">evCoercion</span> <span class="p">(</span><span class="n" style="color: #333;">mkTcNomReflCo</span> <span class="n" style="color: #333;">xi</span><span class="p">))</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1526" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1526
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<pre style="margin: 0;">+<span id="LC1526" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">n_kicked</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">kickOutAfterUnification</span> <span class="n" style="color: #333;">tv</span></span>
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1527
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<pre style="margin: 0;">+<span id="LC1527" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Stop</span> <span class="n" style="color: #333;">wd</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Solved by unification"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pprKicked</span> <span class="n" style="color: #333;">n_kicked</span><span class="p">))</span> <span class="p">}</span></span>
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1510
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1528
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<pre style="margin: 0;"> <span id="LC1528" class="line" lang="haskell"></span>
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1511
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1529
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<pre style="margin: 0;"> <span id="LC1529" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Avoid double unifications]</span></span>
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1512
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1530
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<pre style="margin: 0;"> <span id="LC1530" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1542" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1542,6 +1560,34 @@ and we want to get alpha := N b.</td>
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1542
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1560
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<pre style="margin: 0;"> <span id="LC1560" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See also #15144, which was caused by unifying a representational</span></span>
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1543
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1561
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<pre style="margin: 0;"> <span id="LC1561" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">equality.</span></span>
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1544
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1562
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<pre style="margin: 0;"> <span id="LC1562" class="line" lang="haskell"></span>
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1563
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<pre style="margin: 0;">+<span id="LC1563" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Solve by unification]</span></span>
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1564
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<pre style="margin: 0;">+<span id="LC1564" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1565
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<pre style="margin: 0;">+<span id="LC1565" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If we solve</span></span>
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1566
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<pre style="margin: 0;">+<span id="LC1566" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> alpha[n] ~ ty</span></span>
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1567
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<pre style="margin: 0;">+<span id="LC1567" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">by unification, there are two cases to consider</span></span>
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<pre style="margin: 0;">+<span id="LC1568" class="line" lang="haskell"></span>
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1569
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<pre style="margin: 0;">+<span id="LC1569" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* UnifySameLevel: if the ambient level is 'n', then</span></span>
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1570
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<pre style="margin: 0;">+<span id="LC1570" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> we can simply update alpha := ty, and do nothing else</span></span>
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1571
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<pre style="margin: 0;">+<span id="LC1571" class="line" lang="haskell"></span>
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1572
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<pre style="margin: 0;">+<span id="LC1572" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* UnifyOuterLevel free_metas n: if the ambient level is greater than</span></span>
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1573
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<pre style="margin: 0;">+<span id="LC1573" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 'n' (the level of alpha), in addition to setting alpha := ty we must</span></span>
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1574
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<pre style="margin: 0;">+<span id="LC1574" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> do two other things:</span></span>
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1575
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<pre style="margin: 0;">+<span id="LC1575" class="line" lang="haskell"></span>
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1576
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<pre style="margin: 0;">+<span id="LC1576" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 1. Promote all the free meta-vars of 'ty' to level n. After all,</span></span>
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1577
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<pre style="margin: 0;">+<span id="LC1577" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> alpha[n] is at level n, and so if we set, say,</span></span>
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1578
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<pre style="margin: 0;">+<span id="LC1578" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> alpha[n] := Maybe beta[m],</span></span>
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1579
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<pre style="margin: 0;">+<span id="LC1579" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> we must ensure that when unifying beta we do skolem-escape checks</span></span>
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1580
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<pre style="margin: 0;">+<span id="LC1580" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> etc relevent to level n. Simple way to do that: promote beta to</span></span>
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1581
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<pre style="margin: 0;">+<span id="LC1581" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> level n.</span></span>
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1582
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<pre style="margin: 0;">+<span id="LC1582" class="line" lang="haskell"></span>
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1583
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<pre style="margin: 0;">+<span id="LC1583" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 2. Set the Unification Level Flag to record that a level-n unification has</span></span>
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1584
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<pre style="margin: 0;">+<span id="LC1584" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> taken place. See Note [The Unification Level Flag] in GHC.Tc.Solver.Monad</span></span>
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1585
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<pre style="margin: 0;">+<span id="LC1585" class="line" lang="haskell"></span>
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1586
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<pre style="margin: 0;">+<span id="LC1586" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">NB: UnifySameLevel is just an optimisation for UnifyOuterLevel. Promotion</span></span>
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1587
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<pre style="margin: 0;">+<span id="LC1587" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">would be a no-op, and setting the unification flag unnecessarily would just</span></span>
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1588
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<pre style="margin: 0;">+<span id="LC1588" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">make the solver iterate more often. (We don't need to iterate when unifying</span></span>
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1589
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<pre style="margin: 0;">+<span id="LC1589" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">at the ambient level becuase of the kick-out mechanism.)</span></span>
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1590
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<pre style="margin: 0;">+<span id="LC1590" class="line" lang="haskell"></span>
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1545
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1591
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<pre style="margin: 0;"> <span id="LC1591" class="line" lang="haskell"></span>
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1546
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1592
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<pre style="margin: 0;"> <span id="LC1592" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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<pre style="margin: 0;"> <span id="LC1593" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4f85f14177d0b2be1c1489bc69ad4f69372e1fb4#0c6b585a8a21f8340a85ca2cef89c4b1bf5a8953"><strong>compiler/GHC/Tc/Solver/Monad.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -17,7 +17,7 @@ module GHC.Tc.Solver.Monad (</td>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The TcS monad</span></span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TcS</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">runTcS</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">runTcSDeriveds</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">runTcSWithEvBinds</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">runTcSInerts</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC20" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">failTcS</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">warnTcS</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">addErrTcS</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">failTcS</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">warnTcS</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">addErrTcS</span><span class="p">,</span><span class="idiff left"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">wrapTcS</span></span><span class="p"><span class="idiff right">,</span></span></span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">runTcSEqualities</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">nestTcS</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">nestImplicTcS</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">setEvBindsTcS</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">emitImplicationTcS</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">emitTvImplicationTcS</span><span class="p">,</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -31,6 +31,7 @@ module GHC.Tc.Solver.Monad (</td>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">panicTcS</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">traceTcS</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">traceFireTcS</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">bumpStepCountTcS</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">csTraceTcS</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">wrapErrTcS</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">wrapWarnTcS</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">resetUnificationFlag</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">setUnificationFlag</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Evidence creation and transformation</span></span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MaybeNew</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">freshGoals</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isFresh</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">getEvExpr</span><span class="p">,</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -60,7 +61,7 @@ module GHC.Tc.Solver.Monad (</td>
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<pre style="margin: 0;"> <span id="LC61" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">updInertTcS</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">updInertCans</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">updInertDicts</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">updInertIrreds</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC62" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">getHasGivenEqs</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">setInertCans</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC63" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">getInertEqs</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">getInertCans</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">getInertGivens</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC63" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">getInertInsols</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC64" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">getInertInsols</span><span class="p">,</span><span class="idiff left"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">getInnermostGivenEqLevel</span></span><span class="p"><span class="idiff right">,</span></span></span>
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<pre style="margin: 0;"> <span id="LC65" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">getTcSInerts</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">setTcSInerts</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC66" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">matchableGivens</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">prohibitedSuperClassSolve</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mightMatchLater</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC67" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">getUnsolvedInerts</span><span class="p">,</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -186,7 +187,6 @@ import Control.Monad</td>
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<pre style="margin: 0;"> <span id="LC187" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Monad</span></span>
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<pre style="margin: 0;"> <span id="LC188" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.IORef</span></span>
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<pre style="margin: 0;"> <span id="LC189" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.List</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">partition</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mapAccumL</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC189" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="k" style="font-weight: 600;">qualified</span> <span class="nn" style="color: #555;">Data.Semigroup</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">S</span></span>
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190
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<pre style="margin: 0;"> <span id="LC190" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.List.NonEmpty</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">cons</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">toList</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">nonEmpty</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC191" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="k" style="font-weight: 600;">qualified</span> <span class="nn" style="color: #555;">Data.List.NonEmpty</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">NE</span></span>
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<pre style="margin: 0;"> <span id="LC192" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Arrow</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">first</span> <span class="p">)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -418,12 +418,14 @@ instance Outputable InertSet where</td>
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418
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<pre style="margin: 0;"> <span id="LC418" class="line" lang="haskell"></span>
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419
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<pre style="margin: 0;"> <span id="LC419" class="line" lang="haskell"><span class="n" style="color: #333;">emptyInertCans</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">InertCans</span></span>
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420
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<pre style="margin: 0;"> <span id="LC420" class="line" lang="haskell"><span class="n" style="color: #333;">emptyInertCans</span></span>
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421
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<pre style="margin: 0;">-<span id="LC421" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">IC</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_eqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyDVarEnv</span></span>
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422
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<pre style="margin: 0;">-<span id="LC422" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_dicts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyDicts</span></span>
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423
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<pre style="margin: 0;">-<span id="LC423" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_safehask</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyDicts</span></span>
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424
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<pre style="margin: 0;">-<span id="LC424" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_funeqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyFunEqs</span></span>
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<pre style="margin: 0;">-<span id="LC425" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_insts</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;">-<span id="LC426" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_irreds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyCts</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC421" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">IC</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_eqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyDVarEnv</span></span>
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<pre style="margin: 0;">+<span id="LC422" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_given_eq_lvl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">topTcLevel</span></span>
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<pre style="margin: 0;">+<span id="LC423" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_given_eqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">+<span id="LC424" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_dicts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyDicts</span></span>
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<pre style="margin: 0;">+<span id="LC425" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_safehask</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyDicts</span></span>
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<pre style="margin: 0;">+<span id="LC426" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_funeqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyFunEqs</span></span>
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<pre style="margin: 0;">+<span id="LC427" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_insts</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;">+<span id="LC428" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_irreds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyCts</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC429" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC430" class="line" lang="haskell"><span class="n" style="color: #333;">emptyInert</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">InertSet</span></span>
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<pre style="margin: 0;"> <span id="LC431" class="line" lang="haskell"><span class="n" style="color: #333;">emptyInert</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -697,6 +699,19 @@ data InertCans -- See Note [Detailed InertCans Invariants] for more</td>
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<pre style="margin: 0;"> <span id="LC699" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Irreducible predicates that cannot be made canonical,</span></span>
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<pre style="margin: 0;"> <span id="LC700" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- and which don't interact with others (e.g. (c a))</span></span>
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<pre style="margin: 0;"> <span id="LC701" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- and insoluble predicates (e.g. Int ~ Bool, or a ~ [a])</span></span>
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<pre style="margin: 0;">+<span id="LC702" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC703" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_given_eq_lvl</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcLevel</span></span>
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<pre style="margin: 0;">+<span id="LC704" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The TcLevel of the innermost implication that has a Given</span></span>
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<pre style="margin: 0;">+<span id="LC705" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- equality of the sort that make a unification variable untouchable</span></span>
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<pre style="margin: 0;">+<span id="LC706" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (see Note [Unification preconditions] in GHC.Tc.Utils.Unify).</span></span>
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<pre style="margin: 0;">+<span id="LC707" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Tracking Given equalities] below</span></span>
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<pre style="margin: 0;">+<span id="LC708" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC709" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_given_eqs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC710" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- True <=> The inert Givens *at this level* (tcl_tclvl)</span></span>
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<pre style="margin: 0;">+<span id="LC711" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- could includes at least one equality /other than/ a</span></span>
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<pre style="margin: 0;">+<span id="LC712" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- let-bound skolem equality.</span></span>
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<pre style="margin: 0;">+<span id="LC713" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Reason: report these givens when reporting a failed equality</span></span>
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<pre style="margin: 0;">+<span id="LC714" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Tracking Given equalities]</span></span>
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<pre style="margin: 0;"> <span id="LC715" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC716" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC717" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">InertEqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">DTyVarEnv</span> <span class="kt" style="color: #458; font-weight: 600;">EqualCtList</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -730,7 +745,126 @@ listToEqualCtList :: [Ct] -> Maybe EqualCtList</td>
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<pre style="margin: 0;"> <span id="LC745" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- non-empty</span></span>
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<pre style="margin: 0;"> <span id="LC746" class="line" lang="haskell"><span class="n" style="color: #333;">listToEqualCtList</span> <span class="n" style="color: #333;">cts</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">EqualCtList</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">nonEmpty</span> <span class="n" style="color: #333;">cts</span></span>
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<pre style="margin: 0;"> <span id="LC747" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC733" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Detailed InertCans Invariants]</span></span>
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<pre style="margin: 0;">+<span id="LC748" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Tracking Given equalities]</span></span>
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<pre style="margin: 0;">+<span id="LC749" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">+<span id="LC750" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For reasons described in (UNTOUCHABLE) in GHC.Tc.Utils.Unify</span></span>
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<pre style="margin: 0;">+<span id="LC751" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Unification preconditions], we can't unify</span></span>
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<pre style="margin: 0;">+<span id="LC752" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> alpha[2] ~ Int</span></span>
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<pre style="margin: 0;">+<span id="LC753" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">under a level-4 implication if there are any Given equalities</span></span>
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<pre style="margin: 0;">+<span id="LC754" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">bound by the implications at level 3 of 4. To that end, the</span></span>
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<pre style="margin: 0;">+<span id="LC755" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">InertCans tracks</span></span>
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<pre style="margin: 0;">+<span id="LC756" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC757" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> inert_given_eq_lvl :: TcLevel</span></span>
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758
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<pre style="margin: 0;">+<span id="LC758" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- The TcLevel of the innermost implication that has a Given</span></span>
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759
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<pre style="margin: 0;">+<span id="LC759" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- equality of the sort that make a unification variable untouchable</span></span>
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760
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<pre style="margin: 0;">+<span id="LC760" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- (see Note [Unification preconditions] in GHC.Tc.Utils.Unify).</span></span>
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761
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<pre style="margin: 0;">+<span id="LC761" class="line" lang="haskell"></span>
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762
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<pre style="margin: 0;">+<span id="LC762" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We update inert_given_eq_lvl whenever we add a Given to the</span></span>
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763
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<pre style="margin: 0;">+<span id="LC763" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">inert set, in updateGivenEqs.</span></span>
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764
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<pre style="margin: 0;">+<span id="LC764" class="line" lang="haskell"></span>
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765
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<pre style="margin: 0;">+<span id="LC765" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Then a unification variable alpha[n] is untouchable iff</span></span>
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766
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<pre style="margin: 0;">+<span id="LC766" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> n < inert_given_eq_lvl</span></span>
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767
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<pre style="margin: 0;">+<span id="LC767" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that is, if the unification variable was born outside an</span></span>
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768
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<pre style="margin: 0;">+<span id="LC768" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">enclosing Given equality.</span></span>
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769
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<pre style="margin: 0;">+<span id="LC769" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC770" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Exactly which constraints should trigger (UNTOUCHABLE), and hence</span></span>
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771
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<pre style="margin: 0;">+<span id="LC771" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">should update inert_given_eq_lvl?</span></span>
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772
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<pre style="margin: 0;">+<span id="LC772" class="line" lang="haskell"></span>
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773
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<pre style="margin: 0;">+<span id="LC773" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* We do /not/ need to worry about let-bound skolems, such ast</span></span>
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774
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<pre style="margin: 0;">+<span id="LC774" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> forall[2] a. a ~ [b] => blah</span></span>
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775
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<pre style="margin: 0;">+<span id="LC775" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> See Note [Let-bound skolems]</span></span>
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776
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<pre style="margin: 0;">+<span id="LC776" class="line" lang="haskell"></span>
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777
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<pre style="margin: 0;">+<span id="LC777" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Consider an implication</span></span>
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778
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<pre style="margin: 0;">+<span id="LC778" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> forall[2]. beta[1] => alpha[1] ~ Int</span></span>
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779
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<pre style="margin: 0;">+<span id="LC779" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> where beta is a unification variable that has already been unified</span></span>
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780
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<pre style="margin: 0;">+<span id="LC780" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> to () in an outer scope. Then alpha[1] is perfectly touchable and</span></span>
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781
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<pre style="margin: 0;">+<span id="LC781" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> we can unify alpha := Int. So when deciding whether the givens contain</span></span>
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782
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<pre style="margin: 0;">+<span id="LC782" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> an equality, we should canonicalise first, rather than just looking at</span></span>
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783
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<pre style="margin: 0;">+<span id="LC783" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the /original/ givens (#8644).</span></span>
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784
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<pre style="margin: 0;">+<span id="LC784" class="line" lang="haskell"></span>
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785
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<pre style="margin: 0;">+<span id="LC785" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * However, we must take account of *potential* equalities. Consider the</span></span>
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786
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<pre style="margin: 0;">+<span id="LC786" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> same example again, but this time we have /not/ yet unified beta:</span></span>
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787
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<pre style="margin: 0;">+<span id="LC787" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> forall[2] beta[1] => ...blah...</span></span>
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788
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<pre style="margin: 0;">+<span id="LC788" class="line" lang="haskell"></span>
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789
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<pre style="margin: 0;">+<span id="LC789" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Because beta might turn into an equality, updateGivenEqs conservatively</span></span>
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790
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<pre style="margin: 0;">+<span id="LC790" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> treats it as a potential equality, and updates inert_give_eq_lvl</span></span>
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791
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<pre style="margin: 0;">+<span id="LC791" class="line" lang="haskell"></span>
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792
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<pre style="margin: 0;">+<span id="LC792" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * What about something like forall[2] a b. a ~ F b => [W] alpha[1] ~ X y z?</span></span>
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793
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<pre style="margin: 0;">+<span id="LC793" class="line" lang="haskell"></span>
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794
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<pre style="margin: 0;">+<span id="LC794" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> That Given cannot affect the Wanted, because the Given is entirely</span></span>
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795
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<pre style="margin: 0;">+<span id="LC795" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> *local*: it mentions only skolems bound in the very same</span></span>
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796
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<pre style="margin: 0;">+<span id="LC796" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> implication. Such equalities need not make alpha untouchable. (Test</span></span>
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797
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<pre style="margin: 0;">+<span id="LC797" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> case typecheck/should_compile/LocalGivenEqs has a real-life</span></span>
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798
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<pre style="margin: 0;">+<span id="LC798" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> motivating example, with some detailed commentary.)</span></span>
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799
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<pre style="margin: 0;">+<span id="LC799" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Hence the 'mentionsOuterVar' test in updateGivenEqs.</span></span>
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800
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<pre style="margin: 0;">+<span id="LC800" class="line" lang="haskell"></span>
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801
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<pre style="margin: 0;">+<span id="LC801" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> However, solely to support better error messages</span></span>
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802
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<pre style="margin: 0;">+<span id="LC802" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (see Note [HasGivenEqs] in GHC.Tc.Types.Constraint) we also track</span></span>
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803
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<pre style="margin: 0;">+<span id="LC803" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> these "local" equalities in the boolean inert_given_eqs field.</span></span>
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804
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<pre style="margin: 0;">+<span id="LC804" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> This field is used only to set the ic_given_eqs field to LocalGivenEqs;</span></span>
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805
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<pre style="margin: 0;">+<span id="LC805" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> see the function getHasGivenEqs.</span></span>
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806
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<pre style="margin: 0;">+<span id="LC806" class="line" lang="haskell"></span>
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807
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<pre style="margin: 0;">+<span id="LC807" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Here is a simpler case that triggers this behaviour:</span></span>
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808
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<pre style="margin: 0;">+<span id="LC808" class="line" lang="haskell"></span>
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809
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<pre style="margin: 0;">+<span id="LC809" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T where</span></span>
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810
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<pre style="margin: 0;">+<span id="LC810" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkT :: F a ~ G b => a -> b -> T</span></span>
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811
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<pre style="margin: 0;">+<span id="LC811" class="line" lang="haskell"></span>
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812
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<pre style="margin: 0;">+<span id="LC812" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f (MkT _ _) = True</span></span>
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813
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<pre style="margin: 0;">+<span id="LC813" class="line" lang="haskell"></span>
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814
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<pre style="margin: 0;">+<span id="LC814" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Because of this behaviour around local equality givens, we can infer the</span></span>
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815
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<pre style="margin: 0;">+<span id="LC815" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type of f. This is typecheck/should_compile/LocalGivenEqs2.</span></span>
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816
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<pre style="margin: 0;">+<span id="LC816" class="line" lang="haskell"></span>
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817
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<pre style="margin: 0;">+<span id="LC817" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * We need not look at the equality relation involved (nominal vs</span></span>
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818
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<pre style="margin: 0;">+<span id="LC818" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> representational), because representational equalities can still</span></span>
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819
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<pre style="margin: 0;">+<span id="LC819" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> imply nominal ones. For example, if (G a ~R G b) and G's argument's</span></span>
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820
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<pre style="margin: 0;">+<span id="LC820" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> role is nominal, then we can deduce a ~N b.</span></span>
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821
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<pre style="margin: 0;">+<span id="LC821" class="line" lang="haskell"></span>
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822
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<pre style="margin: 0;">+<span id="LC822" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Let-bound skolems]</span></span>
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823
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<pre style="margin: 0;">+<span id="LC823" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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824
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<pre style="margin: 0;">+<span id="LC824" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If * the inert set contains a canonical Given CEqCan (a ~ ty)</span></span>
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825
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<pre style="margin: 0;">+<span id="LC825" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and * 'a' is a skolem bound in this very implication,</span></span>
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826
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<pre style="margin: 0;">+<span id="LC826" class="line" lang="haskell"></span>
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827
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<pre style="margin: 0;">+<span id="LC827" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">then:</span></span>
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<td class="diff-line-num new new_line" data-linenumber="828" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
828
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<pre style="margin: 0;">+<span id="LC828" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">a) The Given is pretty much a let-binding, like</span></span>
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829
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<pre style="margin: 0;">+<span id="LC829" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: (a ~ b->c) => a -> a</span></span>
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830
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<pre style="margin: 0;">+<span id="LC830" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Here the equality constraint is like saying</span></span>
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831
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<pre style="margin: 0;">+<span id="LC831" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> let a = b->c in ...</span></span>
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832
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<pre style="margin: 0;">+<span id="LC832" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> It is not adding any new, local equality information,</span></span>
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833
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<pre style="margin: 0;">+<span id="LC833" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> and hence can be ignored by has_given_eqs</span></span>
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834
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<pre style="margin: 0;">+<span id="LC834" class="line" lang="haskell"></span>
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835
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<pre style="margin: 0;">+<span id="LC835" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">b) 'a' will have been completely substituted out in the inert set,</span></span>
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836
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<pre style="margin: 0;">+<span id="LC836" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> so we can safely discard it.</span></span>
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837
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<pre style="margin: 0;">+<span id="LC837" class="line" lang="haskell"></span>
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838
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<pre style="margin: 0;">+<span id="LC838" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For an example, see #9211.</span></span>
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839
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<pre style="margin: 0;">+<span id="LC839" class="line" lang="haskell"></span>
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840
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<pre style="margin: 0;">+<span id="LC840" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See also GHC.Tc.Utils.Unify Note [Deeper level on the left] for how we ensure</span></span>
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841
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<pre style="margin: 0;">+<span id="LC841" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that the right variable is on the left of the equality when both are</span></span>
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842
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<pre style="margin: 0;">+<span id="LC842" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">tyvars.</span></span>
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843
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<pre style="margin: 0;">+<span id="LC843" class="line" lang="haskell"></span>
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844
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<pre style="margin: 0;">+<span id="LC844" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">You might wonder whether the skolem really needs to be bound "in the</span></span>
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845
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<pre style="margin: 0;">+<span id="LC845" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">very same implication" as the equuality constraint.</span></span>
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846
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<pre style="margin: 0;">+<span id="LC846" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider this (c.f. #15009):</span></span>
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847
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<pre style="margin: 0;">+<span id="LC847" class="line" lang="haskell"></span>
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848
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<pre style="margin: 0;">+<span id="LC848" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data S a where</span></span>
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849
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<pre style="margin: 0;">+<span id="LC849" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkS :: (a ~ Int) => S a</span></span>
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850
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<pre style="margin: 0;">+<span id="LC850" class="line" lang="haskell"></span>
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851
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<pre style="margin: 0;">+<span id="LC851" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g :: forall a. S a -> a -> blah</span></span>
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852
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<pre style="margin: 0;">+<span id="LC852" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g x y = let h = \z. ( z :: Int</span></span>
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853
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<pre style="margin: 0;">+<span id="LC853" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> , case x of</span></span>
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854
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<pre style="margin: 0;">+<span id="LC854" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkS -> [y,z])</span></span>
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<pre style="margin: 0;">+<span id="LC855" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in ...</span></span>
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856
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<pre style="margin: 0;">+<span id="LC856" class="line" lang="haskell"></span>
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857
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<pre style="margin: 0;">+<span id="LC857" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">From the type signature for `g`, we get `y::a` . Then when we</span></span>
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858
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<pre style="margin: 0;">+<span id="LC858" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">encounter the `\z`, we'll assign `z :: alpha[1]`, say. Next, from the</span></span>
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859
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<pre style="margin: 0;">+<span id="LC859" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">body of the lambda we'll get</span></span>
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860
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<pre style="margin: 0;">+<span id="LC860" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC861" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] alpha[1] ~ Int -- From z::Int</span></span>
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<pre style="margin: 0;">+<span id="LC862" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] forall[2]. (a ~ Int) => [W] alpha[1] ~ a -- From [y,z]</span></span>
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863
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<pre style="margin: 0;">+<span id="LC863" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC864" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Now, unify alpha := a. Now we are stuck with an unsolved alpha~Int!</span></span>
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<pre style="margin: 0;">+<span id="LC865" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So we must treat alpha as untouchable under the forall[2] implication.</span></span>
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866
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<pre style="margin: 0;">+<span id="LC866" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC867" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Detailed InertCans Invariants]</span></span>
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868
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<pre style="margin: 0;"> <span id="LC868" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;"> <span id="LC869" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The InertCans represents a collection of constraints with the following properties:</span></span>
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870
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<pre style="margin: 0;"> <span id="LC870" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1027,6 +1161,8 @@ instance Outputable InertCans where</td>
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1027
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1161
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<pre style="margin: 0;"> <span id="LC1161" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IC</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_eqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eqs</span></span>
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1028
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1162
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<pre style="margin: 0;"> <span id="LC1162" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_funeqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">funeqs</span><span class="p">,</span> <span class="n" style="color: #333;">inert_dicts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dicts</span></span>
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1029
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1163
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<pre style="margin: 0;"> <span id="LC1163" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_safehask</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">safehask</span><span class="p">,</span> <span class="n" style="color: #333;">inert_irreds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">irreds</span></span>
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1164
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<pre style="margin: 0;">+<span id="LC1164" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_given_eq_lvl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ge_lvl</span></span>
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1165
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<pre style="margin: 0;">+<span id="LC1165" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_given_eqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">given_eqs</span></span>
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1030
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1166
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<pre style="margin: 0;"> <span id="LC1166" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_insts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">insts</span> <span class="p">})</span></span>
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1031
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1167
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<pre style="margin: 0;"> <span id="LC1167" class="line" lang="haskell"></span>
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1168
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<pre style="margin: 0;"> <span id="LC1168" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">braces</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">vcat</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1179" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1043,6 +1179,8 @@ instance Outputable InertCans where</td>
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1043
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1179
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<pre style="margin: 0;"> <span id="LC1179" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Irreds ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pprCts</span> <span class="n" style="color: #333;">irreds</span></span>
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1044
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1180
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<pre style="margin: 0;"> <span id="LC1180" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppUnless</span> <span class="p">(</span><span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">insts</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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1045
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1181
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<pre style="margin: 0;"> <span id="LC1181" class="line" lang="haskell"> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Given instances ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">vcat</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">insts</span><span class="p">)</span></span>
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1182
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<pre style="margin: 0;">+<span id="LC1182" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Innermost given equalities ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ge_lvl</span></span>
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1183
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<pre style="margin: 0;">+<span id="LC1183" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Given eqs at this level ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">given_eqs</span></span>
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1046
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1184
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<pre style="margin: 0;"> <span id="LC1184" class="line" lang="haskell"> <span class="p">]</span></span>
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1047
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1185
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<pre style="margin: 0;"> <span id="LC1185" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1048
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1186
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<pre style="margin: 0;"> <span id="LC1186" class="line" lang="haskell"> <span class="n" style="color: #333;">folder</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EqualCtList</span> <span class="n" style="color: #333;">eqs</span><span class="p">)</span> <span class="n" style="color: #333;">rest</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nonEmptyToBag</span> <span class="n" style="color: #333;">eqs</span> <span class="p">`</span><span class="n" style="color: #333;">andCts</span><span class="p">`</span> <span class="n" style="color: #333;">rest</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1456,20 +1594,32 @@ findEq icans (TyFamLHS fun_tc fun_args)</td>
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1456
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<pre style="margin: 0;"> <span id="LC1594" class="line" lang="haskell"><span class="n" style="color: #333;">addInertForAll</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">QCInst</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1457
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1595
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<pre style="margin: 0;"> <span id="LC1595" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Add a local Given instance, typically arising from a type signature</span></span>
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1458
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1596
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<pre style="margin: 0;"> <span id="LC1596" class="line" lang="haskell"><span class="n" style="color: #333;">addInertForAll</span> <span class="n" style="color: #333;">new_qci</span></span>
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1459
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<pre style="margin: 0;">-<span id="LC1459" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">ics</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getInertCans</span></span>
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1460
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<pre style="margin: 0;">-<span id="LC1460" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">insts'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">add_qci</span> <span class="p">(</span><span class="n" style="color: #333;">inert_insts</span> <span class="n" style="color: #333;">ics</span><span class="p">)</span></span>
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1461
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<pre style="margin: 0;">-<span id="LC1461" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">setInertCans</span> <span class="p">(</span><span class="n" style="color: #333;">ics</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_insts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">insts'</span> <span class="p">})</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1597" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">ics</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getInertCans</span></span>
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1598
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<pre style="margin: 0;">+<span id="LC1598" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">ics1</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">add_qci</span> <span class="n" style="color: #333;">ics</span></span>
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1599
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<pre style="margin: 0;">+<span id="LC1599" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1600" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Update given equalities. C.f updateGivenEqs</span></span>
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<pre style="margin: 0;">+<span id="LC1601" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tclvl</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getTcLevel</span></span>
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1602
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<pre style="margin: 0;">+<span id="LC1602" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">qci_pred</span> <span class="n" style="color: #333;">new_qci</span></span>
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1603
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<pre style="margin: 0;">+<span id="LC1603" class="line" lang="haskell"> <span class="n" style="color: #333;">not_equality</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isClassPred</span> <span class="n" style="color: #333;">pred</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isEqPred</span> <span class="n" style="color: #333;">pred</span><span class="p">)</span></span>
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1604
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<pre style="margin: 0;">+<span id="LC1604" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- True <=> definitely not an equality</span></span>
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1605
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<pre style="margin: 0;">+<span id="LC1605" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- A qci_pred like (f a) might be an equality</span></span>
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1606
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<pre style="margin: 0;">+<span id="LC1606" class="line" lang="haskell"></span>
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1607
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<pre style="margin: 0;">+<span id="LC1607" class="line" lang="haskell"> <span class="n" style="color: #333;">ics2</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">not_equality</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ics1</span></span>
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1608
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<pre style="margin: 0;">+<span id="LC1608" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ics1</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_given_eq_lvl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tclvl</span></span>
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1609
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<pre style="margin: 0;">+<span id="LC1609" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_given_eqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="p">}</span></span>
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1610
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<pre style="margin: 0;">+<span id="LC1610" class="line" lang="haskell"></span>
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1611
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<pre style="margin: 0;">+<span id="LC1611" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">setInertCans</span> <span class="n" style="color: #333;">ics2</span> <span class="p">}</span></span>
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1462
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1612
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<pre style="margin: 0;"> <span id="LC1612" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1463
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<pre style="margin: 0;">-<span id="LC1463" class="line" lang="haskell"> <span class="n" style="color: #333;">add_qci</span> <span class="o" style="font-weight: 600;">::</span> <span class="p"><span class="idiff left">[</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">QCInst</span></span><span class="p"><span class="idiff">]</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TcS</span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">QCInst</span></span><span class="p"><span class="idiff right">]</span></span></span>
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1613
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<pre style="margin: 0;">+<span id="LC1613" class="line" lang="haskell"> <span class="n" style="color: #333;">add_qci</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">InertCans</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TcS</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">InertCans</span></span></span>
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1464
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1614
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<pre style="margin: 0;"> <span id="LC1614" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Do not add duplicate quantified instances]</span></span>
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1465
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<pre style="margin: 0;">-<span id="LC1465" class="line" lang="haskell"> <span class="n" style="color: #333;">add_qci</span> <span class="n" style="color: #333;"><span class="idiff left right">qcis</span></span></span>
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1615
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<pre style="margin: 0;">+<span id="LC1615" class="line" lang="haskell"> <span class="n" style="color: #333;">add_qci</span> <span class="n" style="color: #333;"><span class="idiff left">ics</span></span><span class="o" style="font-weight: 600;"><span class="idiff">@</span></span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">IC</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inert_insts</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">qcis</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">})</span></span></span>
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1466
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1616
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<pre style="margin: 0;"> <span id="LC1616" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">any</span> <span class="n" style="color: #333;">same_qci</span> <span class="n" style="color: #333;">qcis</span></span>
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1467
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1617
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<pre style="margin: 0;"> <span id="LC1617" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"skipping duplicate quantified instance"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">new_qci</span><span class="p">)</span></span>
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1468
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<pre style="margin: 0;">-<span id="LC1468" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;"><span class="idiff left right">qci</span>s</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1618" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;"><span class="idiff left right">ic</span>s</span> <span class="p">}</span></span>
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1619
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<pre style="margin: 0;"> <span id="LC1619" class="line" lang="haskell"></span>
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1620
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<pre style="margin: 0;"> <span id="LC1620" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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1471
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1621
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<pre style="margin: 0;"> <span id="LC1621" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"adding new inert quantified instance"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">new_qci</span><span class="p">)</span></span>
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1472
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<pre style="margin: 0;">-<span id="LC1472" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">new_qci</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">:</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">qcis</span></span><span class="p">)</span> <span class="p">}</span></span>
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1622
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<pre style="margin: 0;">+<span id="LC1622" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">ics</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inert_insts</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">new_qci</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">:</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">qcis</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">}</span>)</span> <span class="p">}</span></span>
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1473
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1623
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<pre style="margin: 0;"> <span id="LC1623" class="line" lang="haskell"></span>
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1474
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1624
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<pre style="margin: 0;"> <span id="LC1624" class="line" lang="haskell"> <span class="n" style="color: #333;">same_qci</span> <span class="n" style="color: #333;">old_qci</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcEqType</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvPred</span> <span class="p">(</span><span class="n" style="color: #333;">qci_ev</span> <span class="n" style="color: #333;">old_qci</span><span class="p">))</span></span>
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1475
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1625
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<pre style="margin: 0;"> <span id="LC1625" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ctEvPred</span> <span class="p">(</span><span class="n" style="color: #333;">qci_ev</span> <span class="n" style="color: #333;">new_qci</span><span class="p">))</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1523" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1673" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1523,7 +1673,8 @@ addInertCan ct</td>
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1673
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<pre style="margin: 0;"> <span id="LC1673" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">ics</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getInertCans</span></span>
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1674
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<pre style="margin: 0;"> <span id="LC1674" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">ct</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">maybeEmitShadow</span> <span class="n" style="color: #333;">ics</span> <span class="n" style="color: #333;">ct</span></span>
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1525
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1675
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<pre style="margin: 0;"> <span id="LC1675" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">ics</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">maybeKickOut</span> <span class="n" style="color: #333;">ics</span> <span class="n" style="color: #333;">ct</span></span>
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1526
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<pre style="margin: 0;">-<span id="LC1526" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">setInertCans</span> <span class="p">(</span><span class="n" style="color: #333;">add_item</span> <span class="n" style="color: #333;">ics</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span></span>
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1676
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<pre style="margin: 0;">+<span id="LC1676" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tclvl</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getTcLevel</span></span>
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1677
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<pre style="margin: 0;">+<span id="LC1677" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">setInertCans</span> <span class="p">(</span><span class="n" style="color: #333;">add_item</span> <span class="n" style="color: #333;">tclvl</span> <span class="n" style="color: #333;">ics</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span></span>
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1527
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1678
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<pre style="margin: 0;"> <span id="LC1678" class="line" lang="haskell"></span>
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1528
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1679
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<pre style="margin: 0;"> <span id="LC1679" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"addInertCan }"</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">empty</span> <span class="p">}</span></span>
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1529
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1680
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<pre style="margin: 0;"> <span id="LC1680" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1536" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1687" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1536,23 +1687,54 @@ maybeKickOut ics ct</td>
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1536
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1687
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<pre style="margin: 0;"> <span id="LC1687" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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1688
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<pre style="margin: 0;"> <span id="LC1688" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">ics</span></span>
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<pre style="margin: 0;"> <span id="LC1689" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1539" class="line" lang="haskell"><span class="n" style="color: #333;">add_item</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">InertCans</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">InertCans</span></span>
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<pre style="margin: 0;">-<span id="LC1540" class="line" lang="haskell"><span class="n" style="color: #333;">add_item</span> <span class="n" style="color: #333;">ics</span> <span class="n" style="color: #333;">item</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CEqCan</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TyFamLHS</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span> <span class="p">})</span></span>
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<pre style="margin: 0;">-<span id="LC1541" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ics</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_funeqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addCanFunEq</span> <span class="p">(</span><span class="n" style="color: #333;">inert_funeqs</span> <span class="n" style="color: #333;">ics</span><span class="p">)</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span> <span class="n" style="color: #333;">item</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC1542" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1543" class="line" lang="haskell"><span class="n" style="color: #333;">add_item</span> <span class="n" style="color: #333;">ics</span> <span class="n" style="color: #333;">item</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CEqCan</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TyVarLHS</span> <span class="n" style="color: #333;">tv</span> <span class="p">})</span></span>
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<pre style="margin: 0;">-<span id="LC1544" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ics</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_eqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addTyEq</span> <span class="p">(</span><span class="n" style="color: #333;">inert_eqs</span> <span class="n" style="color: #333;">ics</span><span class="p">)</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">item</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC1545" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1546" class="line" lang="haskell"><span class="n" style="color: #333;">add_item</span> <span class="n" style="color: #333;">ics</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IC</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_irreds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">irreds</span> <span class="p">})</span> <span class="n" style="color: #333;">item</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CIrredCan</span> <span class="p">{})</span></span>
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<pre style="margin: 0;">-<span id="LC1547" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ics</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_irreds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">irreds</span> <span class="p">`</span><span class="kt" style="color: #458; font-weight: 600;">Bag</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">snocBag</span><span class="p">`</span> <span class="n" style="color: #333;">item</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC1548" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1549" class="line" lang="haskell"><span class="n" style="color: #333;">add_item</span> <span class="n" style="color: #333;">ics</span> <span class="n" style="color: #333;">item</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CDictCan</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_class</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cls</span><span class="p">,</span> <span class="n" style="color: #333;">cc_tyargs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tys</span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC1690" class="line" lang="haskell"><span class="n" style="color: #333;">add_item</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcLevel</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">InertCans</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">InertCans</span></span>
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<pre style="margin: 0;">+<span id="LC1691" class="line" lang="haskell"><span class="n" style="color: #333;">add_item</span> <span class="n" style="color: #333;">tc_lvl</span></span>
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<pre style="margin: 0;">+<span id="LC1692" class="line" lang="haskell"> <span class="n" style="color: #333;">ics</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IC</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_funeqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">funeqs</span><span class="p">,</span> <span class="n" style="color: #333;">inert_eqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eqs</span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC1693" class="line" lang="haskell"> <span class="n" style="color: #333;">item</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CEqCan</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lhs</span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC1694" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">updateGivenEqs</span> <span class="n" style="color: #333;">tc_lvl</span> <span class="n" style="color: #333;">item</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC1695" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lhs</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC1696" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TyFamLHS</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">ics</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_funeqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addCanFunEq</span> <span class="n" style="color: #333;">funeqs</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span> <span class="n" style="color: #333;">item</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1697" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TyVarLHS</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">ics</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_eqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addTyEq</span> <span class="n" style="color: #333;">eqs</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">item</span> <span class="p">}</span></span>
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1698
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<pre style="margin: 0;">+<span id="LC1698" class="line" lang="haskell"></span>
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1699
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<pre style="margin: 0;">+<span id="LC1699" class="line" lang="haskell"><span class="n" style="color: #333;">add_item</span> <span class="n" style="color: #333;">tc_lvl</span> <span class="n" style="color: #333;">ics</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IC</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_irreds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">irreds</span> <span class="p">})</span> <span class="n" style="color: #333;">item</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CIrredCan</span> <span class="p">{})</span></span>
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1700
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<pre style="margin: 0;">+<span id="LC1700" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">updateGivenEqs</span> <span class="n" style="color: #333;">tc_lvl</span> <span class="n" style="color: #333;">item</span> <span class="o" style="font-weight: 600;">$</span> <span class="c1" style="color: #998; font-style: italic;">-- An Irred might turn out to be an</span></span>
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1701
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<pre style="margin: 0;">+<span id="LC1701" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- equality, so we play safe</span></span>
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1702
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<pre style="margin: 0;">+<span id="LC1702" class="line" lang="haskell"> <span class="n" style="color: #333;">ics</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_irreds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">irreds</span> <span class="p">`</span><span class="kt" style="color: #458; font-weight: 600;">Bag</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">snocBag</span><span class="p">`</span> <span class="n" style="color: #333;">item</span> <span class="p">}</span></span>
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1703
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<pre style="margin: 0;">+<span id="LC1703" class="line" lang="haskell"></span>
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1704
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<pre style="margin: 0;">+<span id="LC1704" class="line" lang="haskell"><span class="n" style="color: #333;">add_item</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ics</span> <span class="n" style="color: #333;">item</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CDictCan</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_class</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cls</span><span class="p">,</span> <span class="n" style="color: #333;">cc_tyargs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tys</span> <span class="p">})</span></span>
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1550
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1705
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<pre style="margin: 0;"> <span id="LC1705" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ics</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_dicts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addDict</span> <span class="p">(</span><span class="n" style="color: #333;">inert_dicts</span> <span class="n" style="color: #333;">ics</span><span class="p">)</span> <span class="n" style="color: #333;">cls</span> <span class="n" style="color: #333;">tys</span> <span class="n" style="color: #333;">item</span> <span class="p">}</span></span>
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1551
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1706
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<pre style="margin: 0;"> <span id="LC1706" class="line" lang="haskell"></span>
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1552
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<pre style="margin: 0;">-<span id="LC1552" class="line" lang="haskell"><span class="n" style="color: #333;">add_item</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">item</span></span>
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1707
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<pre style="margin: 0;">+<span id="LC1707" class="line" lang="haskell"><span class="n" style="color: #333;">add_item</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;"><span class="idiff left">_</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">item</span></span>
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1553
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1708
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<pre style="margin: 0;"> <span id="LC1708" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"upd_inert set: can't happen! Inserting "</span> <span class="o" style="font-weight: 600;">$</span></span>
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1554
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1709
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<pre style="margin: 0;"> <span id="LC1709" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">item</span> <span class="c1" style="color: #998; font-style: italic;">-- Can't be CNonCanonical because they only land in inert_irreds</span></span>
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1555
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1710
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<pre style="margin: 0;"> <span id="LC1710" class="line" lang="haskell"></span>
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1711
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<pre style="margin: 0;">+<span id="LC1711" class="line" lang="haskell"><span class="n" style="color: #333;">updateGivenEqs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcLevel</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">InertCans</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">InertCans</span></span>
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1712
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<pre style="margin: 0;">+<span id="LC1712" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Set the inert_given_eq_level to the current level (tclvl)</span></span>
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1713
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<pre style="margin: 0;">+<span id="LC1713" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- if the constraint is a given equality that should prevent</span></span>
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1714
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<pre style="margin: 0;">+<span id="LC1714" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- filling in an outer unification variable.</span></span>
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1715
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<pre style="margin: 0;">+<span id="LC1715" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See See Note [Tracking Given equalities]</span></span>
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1716
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<pre style="margin: 0;">+<span id="LC1716" class="line" lang="haskell"><span class="n" style="color: #333;">updateGivenEqs</span> <span class="n" style="color: #333;">tclvl</span> <span class="n" style="color: #333;">ct</span> <span class="n" style="color: #333;">inerts</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IC</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_given_eq_lvl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ge_lvl</span> <span class="p">})</span></span>
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1717
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<pre style="margin: 0;">+<span id="LC1717" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isGivenCt</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">inerts</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1718" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1718
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<pre style="margin: 0;">+<span id="LC1718" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">not_equality</span> <span class="n" style="color: #333;">ct</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">inerts</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Let-bound skolems]</span></span>
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1719
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<pre style="margin: 0;">+<span id="LC1719" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">inerts</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_given_eq_lvl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ge_lvl'</span></span>
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1720
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<pre style="margin: 0;">+<span id="LC1720" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_given_eqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="p">}</span></span>
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1721
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<pre style="margin: 0;">+<span id="LC1721" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1722
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<pre style="margin: 0;">+<span id="LC1722" class="line" lang="haskell"> <span class="n" style="color: #333;">ge_lvl'</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">mentionsOuterVar</span> <span class="n" style="color: #333;">tclvl</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvidence</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span></span>
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1723
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<pre style="margin: 0;">+<span id="LC1723" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Includes things like (c a), which *might* be an equality</span></span>
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1724
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<pre style="margin: 0;">+<span id="LC1724" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tclvl</span></span>
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1725
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<pre style="margin: 0;">+<span id="LC1725" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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1726
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<pre style="margin: 0;">+<span id="LC1726" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ge_lvl</span></span>
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1727
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<pre style="margin: 0;">+<span id="LC1727" class="line" lang="haskell"></span>
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1728
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<pre style="margin: 0;">+<span id="LC1728" class="line" lang="haskell"> <span class="n" style="color: #333;">not_equality</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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1729
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<pre style="margin: 0;">+<span id="LC1729" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- True <=> definitely not an equality of any kind</span></span>
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1730
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<pre style="margin: 0;">+<span id="LC1730" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- except for a let-bound skolem, which doesn't count</span></span>
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1731
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<pre style="margin: 0;">+<span id="LC1731" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Let-bound skolems]</span></span>
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1732
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<pre style="margin: 0;">+<span id="LC1732" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: no need to spot the boxed CDictCan (a ~ b) because its</span></span>
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1733
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<pre style="margin: 0;">+<span id="LC1733" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- superclass (a ~# b) will be a CEqCan</span></span>
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1734
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<pre style="margin: 0;">+<span id="LC1734" class="line" lang="haskell"> <span class="n" style="color: #333;">not_equality</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CEqCan</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TyVarLHS</span> <span class="n" style="color: #333;">tv</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isOuterTyVar</span> <span class="n" style="color: #333;">tclvl</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span></span>
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1735
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<pre style="margin: 0;">+<span id="LC1735" class="line" lang="haskell"> <span class="n" style="color: #333;">not_equality</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CDictCan</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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1736
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<pre style="margin: 0;">+<span id="LC1736" class="line" lang="haskell"> <span class="n" style="color: #333;">not_equality</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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1737
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<pre style="margin: 0;">+<span id="LC1737" class="line" lang="haskell"></span>
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1556
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1738
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<pre style="margin: 0;"> <span id="LC1738" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-----------------------------------------</span></span>
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1557
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1739
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<pre style="margin: 0;"> <span id="LC1739" class="line" lang="haskell"><span class="n" style="color: #333;">kickOutRewritable</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtFlavourRole</span> <span class="c1" style="color: #998; font-style: italic;">-- Flavour/role of the equality that</span></span>
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1558
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1740
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<pre style="margin: 0;"> <span id="LC1740" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- is being added to the inert set</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1596" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1778" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1596,7 +1778,6 @@ kick_out_rewritable :: CtFlavourRole -- Flavour/role of the equality that</td>
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1596
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1778
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<pre style="margin: 0;"> <span id="LC1778" class="line" lang="haskell"><span class="n" style="color: #333;">kick_out_rewritable</span> <span class="n" style="color: #333;">new_fr</span> <span class="n" style="color: #333;">new_lhs</span></span>
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1597
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1779
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<pre style="margin: 0;"> <span id="LC1779" class="line" lang="haskell"> <span class="n" style="color: #333;">ics</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IC</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_eqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tv_eqs</span></span>
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1598
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1780
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<pre style="margin: 0;"> <span id="LC1780" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_dicts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dictmap</span></span>
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1599
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<pre style="margin: 0;">-<span id="LC1599" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_safehask</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">safehask</span></span>
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1600
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1781
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<pre style="margin: 0;"> <span id="LC1781" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_funeqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">funeqmap</span></span>
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1601
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1782
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<pre style="margin: 0;"> <span id="LC1782" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_irreds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">irreds</span></span>
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1602
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1783
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<pre style="margin: 0;"> <span id="LC1783" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_insts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">old_insts</span> <span class="p">})</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1791" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1610,12 +1791,12 @@ kick_out_rewritable new_fr new_lhs</td>
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1610
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1791
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<pre style="margin: 0;"> <span id="LC1791" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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1611
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1792
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<pre style="margin: 0;"> <span id="LC1792" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">kicked_out</span><span class="p">,</span> <span class="n" style="color: #333;">inert_cans_in</span><span class="p">)</span></span>
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1612
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1793
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<pre style="margin: 0;"> <span id="LC1793" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1613
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<pre style="margin: 0;">-<span id="LC1613" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">inert_cans_in</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">IC</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inert_eqs</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">tv_eqs_in</span></span></span>
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1614
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<pre style="margin: 0;">-<span id="LC1614" class="line" lang="haskell"> <span class="idiff left"> </span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inert_dicts</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">dict</span>s_in</span></span>
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1615
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<pre style="margin: 0;">-<span id="LC1615" class="line" lang="haskell"> <span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inert_safehask</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">safehask</span></span><span class="idiff"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- ??</span></span></span>
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1616
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<pre style="margin: 0;">-<span id="LC1616" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_funeqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">feqs_in</span></span>
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1617
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<pre style="margin: 0;">-<span id="LC1617" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_irreds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">irs_in</span></span>
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1618
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<pre style="margin: 0;">-<span id="LC1618" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_insts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">insts_in</span> <span class="p">}</span></span>
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1794
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<pre style="margin: 0;">+<span id="LC1794" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">-- inert_safehask stays unchanged; is that right?</span></span></span>
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1795
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<pre style="margin: 0;">+<span id="LC1795" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">inert_cans_in</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ics</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inert_eqs</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">tv_eq</span>s_in</span></span>
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1796
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<pre style="margin: 0;">+<span id="LC1796" class="line" lang="haskell"> <span class="idiff left"> </span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inert_dicts</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">dicts_in</span></span></span>
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1797
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<pre style="margin: 0;">+<span id="LC1797" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="p">,</span> <span class="n" style="color: #333;">inert_funeqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">feqs_in</span></span>
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<pre style="margin: 0;">+<span id="LC1798" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="p">,</span> <span class="n" style="color: #333;">inert_irreds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">irs_in</span></span>
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<pre style="margin: 0;">+<span id="LC1799" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="p">,</span> <span class="n" style="color: #333;">inert_insts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">insts_in</span> <span class="p">}</span></span>
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1619
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1800
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<pre style="margin: 0;"> <span id="LC1800" class="line" lang="haskell"></span>
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1801
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<pre style="margin: 0;"> <span id="LC1801" class="line" lang="haskell"> <span class="n" style="color: #333;">kicked_out</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">WorkList</span></span>
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1802
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<pre style="margin: 0;"> <span id="LC1802" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: use extendWorkList to ensure that kicked-out equalities get priority</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1968" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1968,6 +2149,10 @@ updInertIrreds upd_fn</td>
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1968
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2149
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<pre style="margin: 0;"> <span id="LC2149" class="line" lang="haskell"><span class="n" style="color: #333;">getInertEqs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DTyVarEnv</span> <span class="kt" style="color: #458; font-weight: 600;">EqualCtList</span><span class="p">)</span></span>
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1969
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2150
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<pre style="margin: 0;"> <span id="LC2150" class="line" lang="haskell"><span class="n" style="color: #333;">getInertEqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">inert</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getInertCans</span><span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">inert_eqs</span> <span class="n" style="color: #333;">inert</span><span class="p">)</span> <span class="p">}</span></span>
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1970
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2151
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<pre style="margin: 0;"> <span id="LC2151" class="line" lang="haskell"></span>
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2152
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<pre style="margin: 0;">+<span id="LC2152" class="line" lang="haskell"><span class="n" style="color: #333;">getInnermostGivenEqLevel</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="kt" style="color: #458; font-weight: 600;">TcLevel</span></span>
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2153
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<pre style="margin: 0;">+<span id="LC2153" class="line" lang="haskell"><span class="n" style="color: #333;">getInnermostGivenEqLevel</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">inert</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getInertCans</span></span>
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2154
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<pre style="margin: 0;">+<span id="LC2154" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">inert_given_eq_lvl</span> <span class="n" style="color: #333;">inert</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC2155" class="line" lang="haskell"></span>
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1971
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2156
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<pre style="margin: 0;"> <span id="LC2156" class="line" lang="haskell"><span class="n" style="color: #333;">getInertInsols</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="kt" style="color: #458; font-weight: 600;">Cts</span></span>
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1972
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2157
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<pre style="margin: 0;"> <span id="LC2157" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returns insoluble equality constraints</span></span>
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1973
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2158
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<pre style="margin: 0;"> <span id="LC2158" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- specifically including Givens</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2077,63 +2262,46 @@ getUnsolvedInerts</td>
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<pre style="margin: 0;"> <span id="LC2262" class="line" lang="haskell"><span class="n" style="color: #333;">getHasGivenEqs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcLevel</span> <span class="c1" style="color: #998; font-style: italic;">-- TcLevel of this implication</span></span>
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2078
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<pre style="margin: 0;"> <span id="LC2263" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">HasGivenEqs</span> <span class="c1" style="color: #998; font-style: italic;">-- are there Given equalities?</span></span>
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2079
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2264
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<pre style="margin: 0;"> <span id="LC2264" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Cts</span> <span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Insoluble equalities arising from givens</span></span>
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2080
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<pre style="margin: 0;">-<span id="LC2080" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">When does an implication have given equalities?</span>]</span></span>
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<pre style="margin: 0;">+<span id="LC2265" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [<span class="idiff left right">Tracking Given equalities</span>]</span></span>
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2081
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2266
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<pre style="margin: 0;"> <span id="LC2266" class="line" lang="haskell"><span class="n" style="color: #333;">getHasGivenEqs</span> <span class="n" style="color: #333;">tclvl</span></span>
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2082
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<pre style="margin: 0;">-<span id="LC2082" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">inerts</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IC</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_eqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ieqs</span><span class="p">,</span> <span class="n" style="color: #333;">inert_funeqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">funeqs</span><span class="p">,</span> <span class="n" style="color: #333;">inert_irreds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">irreds</span> <span class="p">})</span></span>
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2267
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<pre style="margin: 0;">+<span id="LC2267" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">inerts</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IC</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_irreds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">irreds</span></span>
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2268
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<pre style="margin: 0;">+<span id="LC2268" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_given_eqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">given_eqs</span></span>
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2269
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<pre style="margin: 0;">+<span id="LC2269" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_given_eq_lvl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ge_lvl</span> <span class="p">})</span></span>
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2083
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2270
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<pre style="margin: 0;"> <span id="LC2270" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getInertCans</span></span>
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2084
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<pre style="margin: 0;">-<span id="LC2084" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">has_given_eqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldMap</span> <span class="n" style="color: #333;">check_local_given_ct</span> <span class="n" style="color: #333;">irreds</span></span>
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2085
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<pre style="margin: 0;">-<span id="LC2085" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">S</span><span class="o" style="font-weight: 600;">.<></span> <span class="n" style="color: #333;">foldMap</span> <span class="p">(</span><span class="n" style="color: #333;">lift_equal_ct_list</span> <span class="n" style="color: #333;">check_local_given_tv_eq</span><span class="p">)</span> <span class="n" style="color: #333;">ieqs</span></span>
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2086
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<pre style="margin: 0;">-<span id="LC2086" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">S</span><span class="o" style="font-weight: 600;">.<></span> <span class="n" style="color: #333;">foldMapFunEqs</span> <span class="p">(</span><span class="n" style="color: #333;">lift_equal_ct_list</span> <span class="n" style="color: #333;">check_local_given_ct</span><span class="p">)</span> <span class="n" style="color: #333;">funeqs</span></span>
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2087
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<pre style="margin: 0;">-<span id="LC2087" class="line" lang="haskell"> <span class="n" style="color: #333;">insols</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filterBag</span> <span class="n" style="color: #333;">insolubleEqCt</span> <span class="n" style="color: #333;">irreds</span></span>
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<pre style="margin: 0;">+<span id="LC2271" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">insols</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filterBag</span> <span class="n" style="color: #333;">insolubleEqCt</span> <span class="n" style="color: #333;">irreds</span></span>
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2272
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<pre style="margin: 0;"> <span id="LC2272" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Specifically includes ones that originated in some</span></span>
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2273
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<pre style="margin: 0;"> <span id="LC2273" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- outer context but were refined to an insoluble by</span></span>
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2274
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<pre style="margin: 0;"> <span id="LC2274" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- a local equality; so do /not/ add ct_given_here.</span></span>
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2275
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<pre style="margin: 0;"> <span id="LC2275" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2276" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [HasGivenEqs] in GHC.Tc.Types.Constraint, and</span></span>
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2277
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<pre style="margin: 0;">+<span id="LC2277" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Tracking Given equalities] in this module</span></span>
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2278
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<pre style="margin: 0;">+<span id="LC2278" class="line" lang="haskell"> <span class="n" style="color: #333;">has_ge</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">ge_lvl</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">tclvl</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeGivenEqs</span></span>
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2279
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<pre style="margin: 0;">+<span id="LC2279" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">given_eqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">LocalGivenEqs</span></span>
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2280
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<pre style="margin: 0;">+<span id="LC2280" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NoGivenEqs</span></span>
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2281
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<pre style="margin: 0;">+<span id="LC2281" class="line" lang="haskell"></span>
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2092
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2282
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<pre style="margin: 0;"> <span id="LC2282" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"getHasGivenEqs"</span> <span class="o" style="font-weight: 600;">$</span></span>
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2093
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<pre style="margin: 0;">-<span id="LC2093" class="line" lang="haskell"> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"has_given_eqs:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">has_given_eqs</span></span>
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2283
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<pre style="margin: 0;">+<span id="LC2283" class="line" lang="haskell"> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"given_eqs:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">given_eqs</span></span>
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2284
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<pre style="margin: 0;">+<span id="LC2284" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"ge_lvl:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ge_lvl</span></span>
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2285
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<pre style="margin: 0;">+<span id="LC2285" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"ambient level:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tclvl</span></span>
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2094
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2286
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<pre style="margin: 0;"> <span id="LC2286" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Inerts:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">inerts</span></span>
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2095
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2287
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<pre style="margin: 0;"> <span id="LC2287" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Insols:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">insols</span><span class="p">]</span></span>
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2096
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<pre style="margin: 0;">-<span id="LC2096" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">has_given_eqs</span><span class="p">,</span> <span class="n" style="color: #333;">insols</span><span class="p">)</span> <span class="p">}</span></span>
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2097
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<pre style="margin: 0;">-<span id="LC2097" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2098
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<pre style="margin: 0;">-<span id="LC2098" class="line" lang="haskell"> <span class="n" style="color: #333;">check_local_given_ct</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HasGivenEqs</span></span>
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2099
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<pre style="margin: 0;">-<span id="LC2099" class="line" lang="haskell"> <span class="n" style="color: #333;">check_local_given_ct</span> <span class="n" style="color: #333;">ct</span></span>
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2100
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<pre style="margin: 0;">-<span id="LC2100" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">given_here</span> <span class="n" style="color: #333;">ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">mentions_outer_var</span> <span class="n" style="color: #333;">ev</span> <span class="kr" style="font-weight: 600;">then</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeGivenEqs</span> <span class="kr" style="font-weight: 600;">else</span> <span class="kt" style="color: #458; font-weight: 600;">LocalGivenEqs</span></span>
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2101
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<pre style="margin: 0;">-<span id="LC2101" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NoGivenEqs</span></span>
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2102
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<pre style="margin: 0;">-<span id="LC2102" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2103
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<pre style="margin: 0;">-<span id="LC2103" class="line" lang="haskell"> <span class="n" style="color: #333;">ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctEvidence</span> <span class="n" style="color: #333;">ct</span></span>
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2104
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<pre style="margin: 0;">-<span id="LC2104" class="line" lang="haskell"></span>
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2105
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<pre style="margin: 0;">-<span id="LC2105" class="line" lang="haskell"> <span class="n" style="color: #333;">lift_equal_ct_list</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HasGivenEqs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">EqualCtList</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HasGivenEqs</span></span>
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2106
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<pre style="margin: 0;">-<span id="LC2106" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- returns NoGivenEqs for non-singleton lists, as Given lists are always</span></span>
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2107
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<pre style="margin: 0;">-<span id="LC2107" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- singletons</span></span>
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2108
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<pre style="margin: 0;">-<span id="LC2108" class="line" lang="haskell"> <span class="n" style="color: #333;">lift_equal_ct_list</span> <span class="n" style="color: #333;">check</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EqualCtList</span> <span class="p">(</span><span class="n" style="color: #333;">ct</span> <span class="o" style="font-weight: 600;">:|</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">check</span> <span class="n" style="color: #333;">ct</span></span>
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2109
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<pre style="margin: 0;">-<span id="LC2109" class="line" lang="haskell"> <span class="n" style="color: #333;">lift_equal_ct_list</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NoGivenEqs</span></span>
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2110
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<pre style="margin: 0;">-<span id="LC2110" class="line" lang="haskell"></span>
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2111
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<pre style="margin: 0;">-<span id="LC2111" class="line" lang="haskell"> <span class="n" style="color: #333;">check_local_given_tv_eq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HasGivenEqs</span></span>
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2112
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<pre style="margin: 0;">-<span id="LC2112" class="line" lang="haskell"> <span class="n" style="color: #333;">check_local_given_tv_eq</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CEqCan</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_lhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TyVarLHS</span> <span class="n" style="color: #333;">tv</span><span class="p">,</span> <span class="n" style="color: #333;">cc_ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ev</span><span class="p">})</span></span>
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2113
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<pre style="margin: 0;">-<span id="LC2113" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">given_here</span> <span class="n" style="color: #333;">ev</span></span>
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2114
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<pre style="margin: 0;">-<span id="LC2114" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">is_outer_var</span> <span class="n" style="color: #333;">tv</span> <span class="kr" style="font-weight: 600;">then</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeGivenEqs</span> <span class="kr" style="font-weight: 600;">else</span> <span class="kt" style="color: #458; font-weight: 600;">NoGivenEqs</span></span>
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2115
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<pre style="margin: 0;">-<span id="LC2115" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Let-bound skolems]</span></span>
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2116
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<pre style="margin: 0;">-<span id="LC2116" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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2117
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<pre style="margin: 0;">-<span id="LC2117" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NoGivenEqs</span></span>
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2118
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<pre style="margin: 0;">-<span id="LC2118" class="line" lang="haskell"> <span class="n" style="color: #333;">check_local_given_tv_eq</span> <span class="n" style="color: #333;">other_ct</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">check_local_given_ct</span> <span class="n" style="color: #333;">other_ct</span></span>
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2119
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<pre style="margin: 0;">-<span id="LC2119" class="line" lang="haskell"></span>
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2120
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<pre style="margin: 0;">-<span id="LC2120" class="line" lang="haskell"> <span class="n" style="color: #333;">given_here</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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2121
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<pre style="margin: 0;">-<span id="LC2121" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- True for a Given bound by the current implication,</span></span>
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2122
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<pre style="margin: 0;">-<span id="LC2122" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- i.e. the current level</span></span>
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2123
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<pre style="margin: 0;">-<span id="LC2123" class="line" lang="haskell"> <span class="n" style="color: #333;">given_here</span> <span class="n" style="color: #333;">ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isGiven</span> <span class="n" style="color: #333;">ev</span></span>
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2124
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<pre style="margin: 0;">-<span id="LC2124" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">tclvl</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">ctLocLevel</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvLoc</span> <span class="n" style="color: #333;">ev</span><span class="p">)</span></span>
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2125
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<pre style="margin: 0;">-<span id="LC2125" class="line" lang="haskell"></span>
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2126
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<pre style="margin: 0;">-<span id="LC2126" class="line" lang="haskell"> <span class="n" style="color: #333;">mentions_outer_var</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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2127
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<pre style="margin: 0;">-<span id="LC2127" class="line" lang="haskell"> <span class="n" style="color: #333;">mentions_outer_var</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">anyFreeVarsOfType</span> <span class="n" style="color: #333;">is_outer_var</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">ctEvPred</span></span>
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2128
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<pre style="margin: 0;">-<span id="LC2128" class="line" lang="haskell"></span>
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2129
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<pre style="margin: 0;">-<span id="LC2129" class="line" lang="haskell"> <span class="n" style="color: #333;">is_outer_var</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCoVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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2130
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<pre style="margin: 0;">-<span id="LC2130" class="line" lang="haskell"> <span class="n" style="color: #333;">is_outer_var</span> <span class="n" style="color: #333;">tv</span></span>
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2131
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<pre style="margin: 0;">-<span id="LC2131" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: a meta-tv alpha[3] may end up unifying with skolem b[2],</span></span>
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2132
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<pre style="margin: 0;">-<span id="LC2132" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- so treat it as an "outer" var, even at level 3.</span></span>
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2133
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<pre style="margin: 0;">-<span id="LC2133" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This will become redundant after fixing #18929.</span></span>
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2134
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<pre style="margin: 0;">-<span id="LC2134" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTyVar</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isTouchableMetaTyVar</span> <span class="n" style="color: #333;">tclvl</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">||</span></span>
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<pre style="margin: 0;">-<span id="LC2135" class="line" lang="haskell"> <span class="n" style="color: #333;">tclvl</span> <span class="p">`</span><span class="n" style="color: #333;">strictlyDeeperThan</span><span class="p">`</span> <span class="n" style="color: #333;">tcTyVarLevel</span> <span class="n" style="color: #333;">tv</span></span>
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2136
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<pre style="margin: 0;">-<span id="LC2136" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">+<span id="LC2288" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">has_ge</span><span class="p">,</span> <span class="n" style="color: #333;">insols</span><span class="p">)</span> <span class="p">}</span></span>
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2289
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<pre style="margin: 0;">+<span id="LC2289" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2290" class="line" lang="haskell"><span class="n" style="color: #333;">mentionsOuterVar</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcLevel</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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2291
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<pre style="margin: 0;">+<span id="LC2291" class="line" lang="haskell"><span class="n" style="color: #333;">mentionsOuterVar</span> <span class="n" style="color: #333;">tclvl</span> <span class="n" style="color: #333;">ev</span></span>
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2292
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<pre style="margin: 0;">+<span id="LC2292" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">anyFreeVarsOfType</span> <span class="p">(</span><span class="n" style="color: #333;">isOuterTyVar</span> <span class="n" style="color: #333;">tclvl</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC2293" class="line" lang="haskell"> <span class="n" style="color: #333;">ctEvPred</span> <span class="n" style="color: #333;">ev</span></span>
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2294
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<pre style="margin: 0;">+<span id="LC2294" class="line" lang="haskell"></span>
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2295
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<pre style="margin: 0;">+<span id="LC2295" class="line" lang="haskell"><span class="n" style="color: #333;">isOuterTyVar</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcLevel</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCoVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC2296" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- True of a type variable that comes from a</span></span>
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2297
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<pre style="margin: 0;">+<span id="LC2297" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- shallower level than the ambient level (tclvl)</span></span>
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2298
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<pre style="margin: 0;">+<span id="LC2298" class="line" lang="haskell"><span class="n" style="color: #333;">isOuterTyVar</span> <span class="n" style="color: #333;">tclvl</span> <span class="n" style="color: #333;">tv</span></span>
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2299
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<pre style="margin: 0;">+<span id="LC2299" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTyVar</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tclvl</span> <span class="p">`</span><span class="n" style="color: #333;">strictlyDeeperThan</span><span class="p">`</span> <span class="n" style="color: #333;">tcTyVarLevel</span> <span class="n" style="color: #333;">tv</span></span>
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2300
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<pre style="margin: 0;">+<span id="LC2300" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">isPromotableMetaTyVar</span> <span class="n" style="color: #333;">tv</span></span>
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2301
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<pre style="margin: 0;">+<span id="LC2301" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- isPromotable: a meta-tv alpha[3] may end up unifying with skolem b[2],</span></span>
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2302
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<pre style="margin: 0;">+<span id="LC2302" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- so treat it as an "outer" var, even at level 3.</span></span>
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2303
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<pre style="margin: 0;">+<span id="LC2303" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This will become redundant after fixing #18929.</span></span>
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2304
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<pre style="margin: 0;">+<span id="LC2304" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="c1" style="color: #998; font-style: italic;">-- Coercion variables; doesn't much matter</span></span>
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2137
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2305
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<pre style="margin: 0;"> <span id="LC2305" class="line" lang="haskell"></span>
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2138
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2306
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<pre style="margin: 0;"> <span id="LC2306" class="line" lang="haskell"><span class="cd">-- | Returns Given constraints that might,</span></span>
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2139
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2307
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<pre style="margin: 0;"> <span id="LC2307" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- potentially, match the given pred. This is used when checking to see if a</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2267,112 +2435,6 @@ Examples:</td>
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2435
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<pre style="margin: 0;"> <span id="LC2435" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This treatment fixes #18910 and is tested in</span></span>
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2268
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<pre style="margin: 0;"> <span id="LC2436" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">typecheck/should_compile/InstanceGivenOverlap{,2}</span></span>
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2269
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2437
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<pre style="margin: 0;"> <span id="LC2437" class="line" lang="haskell"></span>
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2270
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<pre style="margin: 0;">-<span id="LC2270" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [When does an implication have given equalities?]</span></span>
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2271
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<pre style="margin: 0;">-<span id="LC2271" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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2272
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<pre style="margin: 0;">-<span id="LC2272" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider an implication</span></span>
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2273
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<pre style="margin: 0;">-<span id="LC2273" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> beta => alpha ~ Int</span></span>
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2274
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<pre style="margin: 0;">-<span id="LC2274" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">where beta is a unification variable that has already been unified</span></span>
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2275
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<pre style="margin: 0;">-<span id="LC2275" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to () in an outer scope. Then we can float the (alpha ~ Int) out</span></span>
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2276
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<pre style="margin: 0;">-<span id="LC2276" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">just fine. So when deciding whether the givens contain an equality,</span></span>
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2277
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<pre style="margin: 0;">-<span id="LC2277" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we should canonicalise first, rather than just looking at the original</span></span>
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<pre style="margin: 0;">-<span id="LC2278" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">givens (#8644).</span></span>
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2279
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<pre style="margin: 0;">-<span id="LC2279" class="line" lang="haskell"></span>
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2280
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<pre style="margin: 0;">-<span id="LC2280" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So we simply look at the inert, canonical Givens and see if there are</span></span>
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2281
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<pre style="margin: 0;">-<span id="LC2281" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">any equalities among them, the calculation of has_given_eqs. There</span></span>
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2282
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<pre style="margin: 0;">-<span id="LC2282" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">are some wrinkles:</span></span>
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2283
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<pre style="margin: 0;">-<span id="LC2283" class="line" lang="haskell"></span>
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2284
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<pre style="margin: 0;">-<span id="LC2284" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * We must know which ones are bound in *this* implication and which</span></span>
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2285
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<pre style="margin: 0;">-<span id="LC2285" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> are bound further out. We can find that out from the TcLevel</span></span>
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2286
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<pre style="margin: 0;">-<span id="LC2286" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> of the Given, which is itself recorded in the tcl_tclvl field</span></span>
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2287
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<pre style="margin: 0;">-<span id="LC2287" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> of the TcLclEnv stored in the Given (ev_given_here).</span></span>
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2288
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<pre style="margin: 0;">-<span id="LC2288" class="line" lang="haskell"></span>
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2289
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<pre style="margin: 0;">-<span id="LC2289" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> What about interactions between inner and outer givens?</span></span>
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2290
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<pre style="margin: 0;">-<span id="LC2290" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - Outer given is rewritten by an inner given, then there must</span></span>
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2291
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<pre style="margin: 0;">-<span id="LC2291" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> have been an inner given equality, hence the “given-eq” flag</span></span>
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2292
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<pre style="margin: 0;">-<span id="LC2292" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> will be true anyway.</span></span>
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2293
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<pre style="margin: 0;">-<span id="LC2293" class="line" lang="haskell"></span>
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2294
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<pre style="margin: 0;">-<span id="LC2294" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - Inner given rewritten by outer, retains its level (ie. The inner one)</span></span>
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2295
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<pre style="margin: 0;">-<span id="LC2295" class="line" lang="haskell"></span>
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2296
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<pre style="margin: 0;">-<span id="LC2296" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * We must take account of *potential* equalities, like the one above:</span></span>
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2297
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<pre style="margin: 0;">-<span id="LC2297" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> beta => ...blah...</span></span>
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2298
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<pre style="margin: 0;">-<span id="LC2298" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> If we still don't know what beta is, we conservatively treat it as potentially</span></span>
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2299
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<pre style="margin: 0;">-<span id="LC2299" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> becoming an equality. Hence including 'irreds' in the calculation or has_given_eqs.</span></span>
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2300
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<pre style="margin: 0;">-<span id="LC2300" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Note that we can't really know what's in an irred, so any irred is considered</span></span>
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2301
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<pre style="margin: 0;">-<span id="LC2301" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a potential equality.</span></span>
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2302
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<pre style="margin: 0;">-<span id="LC2302" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2303" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * What about something like forall a b. a ~ F b => [W] c ~ X y z? That Given</span></span>
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<pre style="margin: 0;">-<span id="LC2304" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> cannot affect the Wanted, because the Given is entirely *local*: it mentions</span></span>
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2305
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<pre style="margin: 0;">-<span id="LC2305" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> only skolems bound in the very same implication. Such equalities need not</span></span>
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2306
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<pre style="margin: 0;">-<span id="LC2306" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> prevent floating. (Test case typecheck/should_compile/LocalGivenEqs has a</span></span>
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2307
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<pre style="margin: 0;">-<span id="LC2307" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> real-life motivating example, with some detailed commentary.) These</span></span>
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2308
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<pre style="margin: 0;">-<span id="LC2308" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> equalities are noted with LocalGivenEqs: they do not prevent floating, but</span></span>
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2309
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<pre style="margin: 0;">-<span id="LC2309" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> they also are allowed to show up in error messages. See</span></span>
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2310
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<pre style="margin: 0;">-<span id="LC2310" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Note [Suppress redundant givens during error reporting] in GHC.Tc.Errors.</span></span>
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2311
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<pre style="margin: 0;">-<span id="LC2311" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The difference between what stops floating and what is suppressed from</span></span>
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2312
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<pre style="margin: 0;">-<span id="LC2312" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> error messages is why we need three options for HasGivenEqs.</span></span>
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2313
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<pre style="margin: 0;">-<span id="LC2313" class="line" lang="haskell"></span>
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2314
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<pre style="margin: 0;">-<span id="LC2314" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> There is also a simpler case that triggers this behaviour:</span></span>
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2315
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<pre style="margin: 0;">-<span id="LC2315" class="line" lang="haskell"></span>
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2316
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<pre style="margin: 0;">-<span id="LC2316" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T where</span></span>
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2317
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<pre style="margin: 0;">-<span id="LC2317" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkT :: F a ~ G b => a -> b -> T</span></span>
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2318
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<pre style="margin: 0;">-<span id="LC2318" class="line" lang="haskell"></span>
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2319
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<pre style="margin: 0;">-<span id="LC2319" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f (MkT _ _) = True</span></span>
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2320
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<pre style="margin: 0;">-<span id="LC2320" class="line" lang="haskell"></span>
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2321
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<pre style="margin: 0;">-<span id="LC2321" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Because of this behaviour around local equality givens, we can infer the</span></span>
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2322
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<pre style="margin: 0;">-<span id="LC2322" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type of f. This is typecheck/should_compile/LocalGivenEqs2.</span></span>
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2323
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<pre style="margin: 0;">-<span id="LC2323" class="line" lang="haskell"></span>
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2324
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<pre style="margin: 0;">-<span id="LC2324" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * See Note [Let-bound skolems] for another wrinkle</span></span>
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2325
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<pre style="margin: 0;">-<span id="LC2325" class="line" lang="haskell"></span>
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2326
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<pre style="margin: 0;">-<span id="LC2326" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * We need not look at the equality relation involved (nominal vs representational),</span></span>
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2327
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<pre style="margin: 0;">-<span id="LC2327" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> because representational equalities can still imply nominal ones. For example,</span></span>
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<pre style="margin: 0;">-<span id="LC2328" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> if (G a ~R G b) and G's argument's role is nominal, then we can deduce a ~N b.</span></span>
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2329
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<pre style="margin: 0;">-<span id="LC2329" class="line" lang="haskell"></span>
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2330
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<pre style="margin: 0;">-<span id="LC2330" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Let-bound skolems]</span></span>
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2331
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<pre style="margin: 0;">-<span id="LC2331" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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2332
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<pre style="margin: 0;">-<span id="LC2332" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If * the inert set contains a canonical Given CEqCan (a ~ ty)</span></span>
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2333
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<pre style="margin: 0;">-<span id="LC2333" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and * 'a' is a skolem bound in this very implication,</span></span>
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2334
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<pre style="margin: 0;">-<span id="LC2334" class="line" lang="haskell"></span>
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2335
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<pre style="margin: 0;">-<span id="LC2335" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">then:</span></span>
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2336
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<pre style="margin: 0;">-<span id="LC2336" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">a) The Given is pretty much a let-binding, like</span></span>
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2337
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<pre style="margin: 0;">-<span id="LC2337" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: (a ~ b->c) => a -> a</span></span>
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2338
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<pre style="margin: 0;">-<span id="LC2338" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Here the equality constraint is like saying</span></span>
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2339
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<pre style="margin: 0;">-<span id="LC2339" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> let a = b->c in ...</span></span>
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2340
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<pre style="margin: 0;">-<span id="LC2340" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> It is not adding any new, local equality information,</span></span>
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2341
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<pre style="margin: 0;">-<span id="LC2341" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> and hence can be ignored by has_given_eqs</span></span>
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2342
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<pre style="margin: 0;">-<span id="LC2342" class="line" lang="haskell"></span>
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2343
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<pre style="margin: 0;">-<span id="LC2343" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">b) 'a' will have been completely substituted out in the inert set,</span></span>
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2344
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<pre style="margin: 0;">-<span id="LC2344" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> so we can safely discard it.</span></span>
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2345
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<pre style="margin: 0;">-<span id="LC2345" class="line" lang="haskell"></span>
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2346
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<pre style="margin: 0;">-<span id="LC2346" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For an example, see #9211.</span></span>
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2347
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<pre style="margin: 0;">-<span id="LC2347" class="line" lang="haskell"></span>
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2348
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<pre style="margin: 0;">-<span id="LC2348" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See also GHC.Tc.Utils.Unify Note [Deeper level on the left] for how we ensure</span></span>
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2349
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<pre style="margin: 0;">-<span id="LC2349" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that the right variable is on the left of the equality when both are</span></span>
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2350
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<pre style="margin: 0;">-<span id="LC2350" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">tyvars.</span></span>
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2351
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<pre style="margin: 0;">-<span id="LC2351" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2352" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">You might wonder whether the skokem really needs to be bound "in the</span></span>
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2353
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<pre style="margin: 0;">-<span id="LC2353" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">very same implication" as the equuality constraint.</span></span>
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2354
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<pre style="margin: 0;">-<span id="LC2354" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(c.f. #15009) Consider this:</span></span>
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2355
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<pre style="margin: 0;">-<span id="LC2355" class="line" lang="haskell"></span>
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2356
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<pre style="margin: 0;">-<span id="LC2356" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data S a where</span></span>
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2357
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<pre style="margin: 0;">-<span id="LC2357" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkS :: (a ~ Int) => S a</span></span>
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2358
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<pre style="margin: 0;">-<span id="LC2358" class="line" lang="haskell"></span>
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2359
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<pre style="margin: 0;">-<span id="LC2359" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g :: forall a. S a -> a -> blah</span></span>
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2360
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<pre style="margin: 0;">-<span id="LC2360" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g x y = let h = \z. ( z :: Int</span></span>
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2361
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<pre style="margin: 0;">-<span id="LC2361" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> , case x of</span></span>
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2362
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<pre style="margin: 0;">-<span id="LC2362" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkS -> [y,z])</span></span>
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2363
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<pre style="margin: 0;">-<span id="LC2363" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in ...</span></span>
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2364
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<pre style="margin: 0;">-<span id="LC2364" class="line" lang="haskell"></span>
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2365
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<pre style="margin: 0;">-<span id="LC2365" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">From the type signature for `g`, we get `y::a` . Then when we</span></span>
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2366
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<pre style="margin: 0;">-<span id="LC2366" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">encounter the `\z`, we'll assign `z :: alpha[1]`, say. Next, from the</span></span>
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2367
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<pre style="margin: 0;">-<span id="LC2367" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">body of the lambda we'll get</span></span>
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2368
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<pre style="margin: 0;">-<span id="LC2368" class="line" lang="haskell"></span>
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2369
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<pre style="margin: 0;">-<span id="LC2369" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] alpha[1] ~ Int -- From z::Int</span></span>
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2370
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<pre style="margin: 0;">-<span id="LC2370" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] forall[2]. (a ~ Int) => [W] alpha[1] ~ a -- From [y,z]</span></span>
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2371
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<pre style="margin: 0;">-<span id="LC2371" class="line" lang="haskell"></span>
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2372
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<pre style="margin: 0;">-<span id="LC2372" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Now, suppose we decide to float `alpha ~ a` out of the implication</span></span>
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2373
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<pre style="margin: 0;">-<span id="LC2373" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and then unify `alpha := a`. Now we are stuck! But if treat</span></span>
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2374
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<pre style="margin: 0;">-<span id="LC2374" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">`alpha ~ Int` first, and unify `alpha := Int`, all is fine.</span></span>
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2375
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<td class="diff-line-num new_line old" data-linenumber="2438" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC2375" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But we absolutely cannot float that equality or we will get stuck.</span></span>
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2376
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2438
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<pre style="margin: 0;"> <span id="LC2438" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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2439
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<pre style="margin: 0;"> <span id="LC2439" class="line" lang="haskell"></span>
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2440
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<pre style="margin: 0;"> <span id="LC2440" class="line" lang="haskell"><span class="n" style="color: #333;">removeInertCts</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Ct</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">InertCans</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">InertCans</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2614" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2552,9 +2614,6 @@ tcAppMapToBag m = foldTcAppMap consBag m emptyBag</td>
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<pre style="margin: 0;"> <span id="LC2614" class="line" lang="haskell"><span class="n" style="color: #333;">foldTcAppMap</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcAppMap</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span></span>
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2553
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2615
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<pre style="margin: 0;"> <span id="LC2615" class="line" lang="haskell"><span class="n" style="color: #333;">foldTcAppMap</span> <span class="n" style="color: #333;">k</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">z</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldDTyConEnv</span> <span class="p">(</span><span class="n" style="color: #333;">foldTM</span> <span class="n" style="color: #333;">k</span><span class="p">)</span> <span class="n" style="color: #333;">z</span> <span class="n" style="color: #333;">m</span></span>
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2554
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2616
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<pre style="margin: 0;"> <span id="LC2616" class="line" lang="haskell"></span>
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2555
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<pre style="margin: 0;">-<span id="LC2555" class="line" lang="haskell"><span class="n" style="color: #333;">foldMapTcAppMap</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Monoid</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=></span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">m</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcAppMap</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">m</span></span>
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2556
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<pre style="margin: 0;">-<span id="LC2556" class="line" lang="haskell"><span class="n" style="color: #333;">foldMapTcAppMap</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldMap</span> <span class="p">(</span><span class="n" style="color: #333;">foldMap</span> <span class="n" style="color: #333;">f</span><span class="p">)</span></span>
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2557
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<pre style="margin: 0;">-<span id="LC2557" class="line" lang="haskell"></span>
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2617
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<pre style="margin: 0;"> <span id="LC2617" class="line" lang="haskell"></span>
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2618
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<pre style="margin: 0;"> <span id="LC2618" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *********************************************************************</span></span>
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2619
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<pre style="margin: 0;"> <span id="LC2619" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2747" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2688,9 +2747,6 @@ findFunEqsByTyCon m tc</td>
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2688
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2747
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<pre style="margin: 0;"> <span id="LC2747" class="line" lang="haskell"><span class="n" style="color: #333;">foldFunEqs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FunEqMap</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span></span>
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2689
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2748
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<pre style="margin: 0;"> <span id="LC2748" class="line" lang="haskell"><span class="n" style="color: #333;">foldFunEqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldTcAppMap</span></span>
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2749
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<pre style="margin: 0;"> <span id="LC2749" class="line" lang="haskell"></span>
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2691
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<pre style="margin: 0;">-<span id="LC2691" class="line" lang="haskell"><span class="n" style="color: #333;">foldMapFunEqs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Monoid</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=></span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">m</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FunEqMap</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">m</span></span>
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<pre style="margin: 0;">-<span id="LC2692" class="line" lang="haskell"><span class="n" style="color: #333;">foldMapFunEqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldMapTcAppMap</span></span>
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<pre style="margin: 0;">-<span id="LC2693" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2750" class="line" lang="haskell"><span class="n" style="color: #333;">insertFunEq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FunEqMap</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FunEqMap</span> <span class="n" style="color: #333;">a</span></span>
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2695
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2751
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<pre style="margin: 0;"> <span id="LC2751" class="line" lang="haskell"><span class="n" style="color: #333;">insertFunEq</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span> <span class="n" style="color: #333;">val</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">insertTcApp</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span> <span class="n" style="color: #333;">val</span></span>
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2696
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2752
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<pre style="margin: 0;"> <span id="LC2752" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2779" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2723,6 +2779,12 @@ data TcSEnv</td>
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2723
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2779
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<pre style="margin: 0;"> <span id="LC2779" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The number of unification variables we have filled</span></span>
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2724
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2780
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<pre style="margin: 0;"> <span id="LC2780" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The important thing is whether it is non-zero</span></span>
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2725
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2781
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<pre style="margin: 0;"> <span id="LC2781" class="line" lang="haskell"></span>
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2782
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<pre style="margin: 0;">+<span id="LC2782" class="line" lang="haskell"> <span class="n" style="color: #333;">tcs_unif_lvl</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IORef</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">TcLevel</span><span class="p">),</span></span>
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2783
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<pre style="margin: 0;">+<span id="LC2783" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The Unification Level Flag</span></span>
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<pre style="margin: 0;">+<span id="LC2784" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Outermost level at which we have unified a meta tyvar</span></span>
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<pre style="margin: 0;">+<span id="LC2785" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Starts at Nothing, then (Just i), then (Just j) where j<i</span></span>
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<pre style="margin: 0;">+<span id="LC2786" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [The Unification Level Flag]</span></span>
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2787
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<pre style="margin: 0;">+<span id="LC2787" class="line" lang="haskell"></span>
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2726
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<pre style="margin: 0;"> <span id="LC2788" class="line" lang="haskell"> <span class="n" style="color: #333;">tcs_count</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IORef</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="p">,</span> <span class="c1" style="color: #998; font-style: italic;">-- Global step count</span></span>
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2727
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2789
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<pre style="margin: 0;"> <span id="LC2789" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2790" class="line" lang="haskell"> <span class="n" style="color: #333;">tcs_inerts</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IORef</span> <span class="kt" style="color: #458; font-weight: 600;">InertSet</span><span class="p">,</span> <span class="c1" style="color: #998; font-style: italic;">-- Current inert set</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2877" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2939" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2877,8 +2939,10 @@ runTcSWithEvBinds' restore_cycles ev_binds_var tcs</td>
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2877
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2939
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<pre style="margin: 0;"> <span id="LC2939" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">step_count</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">newTcRef</span> <span class="mi" style="color: #099;">0</span></span>
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2878
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2940
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<pre style="margin: 0;"> <span id="LC2940" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">inert_var</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">newTcRef</span> <span class="n" style="color: #333;">emptyInert</span></span>
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2879
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2941
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<pre style="margin: 0;"> <span id="LC2941" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">wl_var</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">newTcRef</span> <span class="n" style="color: #333;">emptyWorkList</span></span>
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2942
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<pre style="margin: 0;">+<span id="LC2942" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">unif_lvl_var</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">newTcRef</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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2880
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2943
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<pre style="margin: 0;"> <span id="LC2943" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TcSEnv</span> <span class="p">{</span> <span class="n" style="color: #333;">tcs_ev_binds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ev_binds_var</span></span>
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<pre style="margin: 0;"> <span id="LC2944" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcs_unified</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unified_var</span></span>
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<pre style="margin: 0;">+<span id="LC2945" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcs_unif_lvl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unif_lvl_var</span></span>
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<pre style="margin: 0;"> <span id="LC2946" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcs_count</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">step_count</span></span>
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<pre style="margin: 0;"> <span id="LC2947" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcs_inerts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">inert_var</span></span>
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2948
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<pre style="margin: 0;"> <span id="LC2948" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcs_worklist</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wl_var</span> <span class="p">}</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2941" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2941,15 +3005,19 @@ nestImplicTcS ref inner_tclvl (TcS thing_inside)</td>
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2941
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3005
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<pre style="margin: 0;"> <span id="LC3005" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="kt" style="color: #458; font-weight: 600;">TcSEnv</span> <span class="p">{</span> <span class="n" style="color: #333;">tcs_unified</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unified_var</span></span>
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2942
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<pre style="margin: 0;"> <span id="LC3006" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcs_inerts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">old_inert_var</span></span>
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2943
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<pre style="margin: 0;"> <span id="LC3007" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcs_count</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">count</span></span>
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<pre style="margin: 0;">+<span id="LC3008" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcs_unif_lvl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unif_lvl</span></span>
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<pre style="margin: 0;"> <span id="LC3009" class="line" lang="haskell"> <span class="p">}</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;"> <span id="LC3010" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">inerts</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">readTcRef</span> <span class="n" style="color: #333;">old_inert_var</span></span>
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<pre style="margin: 0;">-<span id="LC2946" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">nest_inert</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">inerts</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_cycle_breakers</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC2947" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- all other InertSet fields are inherited</span></span>
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<pre style="margin: 0;">+<span id="LC3011" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">nest_inert</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">inerts</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_cycle_breakers</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;">+<span id="LC3012" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">inert_cans</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">inert_cans</span> <span class="n" style="color: #333;">inerts</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC3013" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">inert_given_eqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="p">}</span> <span class="p">}</span></span>
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3014
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<pre style="margin: 0;">+<span id="LC3014" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- All other InertSet fields are inherited</span></span>
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2948
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3015
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<pre style="margin: 0;"> <span id="LC3015" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">new_inert_var</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">newTcRef</span> <span class="n" style="color: #333;">nest_inert</span></span>
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3016
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<pre style="margin: 0;"> <span id="LC3016" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">new_wl_var</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">newTcRef</span> <span class="n" style="color: #333;">emptyWorkList</span></span>
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<pre style="margin: 0;">-<span id="LC2950" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">nest_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TcSEnv</span> <span class="p">{</span> <span class="n" style="color: #333;">tcs_ev_binds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ref</span></span>
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3017
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<pre style="margin: 0;">+<span id="LC3017" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">nest_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TcSEnv</span> <span class="p">{</span> <span class="n" style="color: #333;">tcs_count</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">count</span> <span class="c1" style="color: #998; font-style: italic;">-- Inherited</span></span>
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3018
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<pre style="margin: 0;">+<span id="LC3018" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcs_unif_lvl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unif_lvl</span> <span class="c1" style="color: #998; font-style: italic;">-- Inherited</span></span>
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3019
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<pre style="margin: 0;">+<span id="LC3019" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcs_ev_binds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ref</span></span>
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2951
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3020
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<pre style="margin: 0;"> <span id="LC3020" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcs_unified</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unified_var</span></span>
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2952
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<pre style="margin: 0;">-<span id="LC2952" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcs_count</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">count</span></span>
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2953
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3021
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<pre style="margin: 0;"> <span id="LC3021" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcs_inerts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">new_inert_var</span></span>
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2954
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3022
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<pre style="margin: 0;"> <span id="LC3022" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcs_worklist</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">new_wl_var</span> <span class="p">}</span></span>
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2955
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3023
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<pre style="margin: 0;"> <span id="LC3023" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">res</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">setTcLevel</span> <span class="n" style="color: #333;">inner_tclvl</span> <span class="o" style="font-weight: 600;">$</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -3260,6 +3328,97 @@ pprKicked :: Int -> SDoc</td>
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3260
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3328
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<pre style="margin: 0;"> <span id="LC3328" class="line" lang="haskell"><span class="n" style="color: #333;">pprKicked</span> <span class="mi" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">empty</span></span>
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3261
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3329
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<pre style="margin: 0;"> <span id="LC3329" class="line" lang="haskell"><span class="n" style="color: #333;">pprKicked</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">parens</span> <span class="p">(</span><span class="n" style="color: #333;">int</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"kicked out"</span><span class="p">)</span></span>
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3262
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3330
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<pre style="margin: 0;"> <span id="LC3330" class="line" lang="haskell"></span>
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3331
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<pre style="margin: 0;">+<span id="LC3331" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *********************************************************************</span></span>
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3332
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<pre style="margin: 0;">+<span id="LC3332" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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3333
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<pre style="margin: 0;">+<span id="LC3333" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* The Unification Level Flag *</span></span>
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3334
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<pre style="margin: 0;">+<span id="LC3334" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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3335
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<pre style="margin: 0;">+<span id="LC3335" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">********************************************************************* -}</span></span>
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3336
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<pre style="margin: 0;">+<span id="LC3336" class="line" lang="haskell"></span>
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3337
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<pre style="margin: 0;">+<span id="LC3337" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [The Unification Level Flag]</span></span>
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3338
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<pre style="margin: 0;">+<span id="LC3338" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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3339
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<pre style="margin: 0;">+<span id="LC3339" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider a deep tree of implication constraints</span></span>
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<pre style="margin: 0;">+<span id="LC3340" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> forall[1] a. -- Outer-implic</span></span>
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<pre style="margin: 0;">+<span id="LC3341" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> C alpha[1] -- Simple</span></span>
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<pre style="margin: 0;">+<span id="LC3342" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> forall[2] c. ....(C alpha[1]).... -- Implic-1</span></span>
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3343
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<pre style="margin: 0;">+<span id="LC3343" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> forall[2] b. ....(alpha[1] ~ Int).... -- Implic-2</span></span>
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3344
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<pre style="margin: 0;">+<span id="LC3344" class="line" lang="haskell"></span>
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3345
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<pre style="margin: 0;">+<span id="LC3345" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The (C alpha) is insoluble until we know alpha. We solve alpha</span></span>
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3346
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<pre style="margin: 0;">+<span id="LC3346" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">by unifying alpha:=Int somewhere deep inside Implic-2. But then we</span></span>
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3347
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<pre style="margin: 0;">+<span id="LC3347" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">must try to solve the Outer-implic all over again. This time we can</span></span>
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3348
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<pre style="margin: 0;">+<span id="LC3348" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">solve (C alpha) both in Outer-implic, and nested inside Implic-1.</span></span>
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3349
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<pre style="margin: 0;">+<span id="LC3349" class="line" lang="haskell"></span>
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3350
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<pre style="margin: 0;">+<span id="LC3350" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">When should we iterate solving a level-n implication?</span></span>
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3351
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<pre style="margin: 0;">+<span id="LC3351" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Answer: if any unification of a tyvar at level n takes place</span></span>
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3352
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<pre style="margin: 0;">+<span id="LC3352" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in the ic_implics of that implication.</span></span>
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3353
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<pre style="margin: 0;">+<span id="LC3353" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3354" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* What if a unification takes place at level n-1? Then don't iterate</span></span>
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<pre style="margin: 0;">+<span id="LC3355" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> level n, because we'll iterate level n-1, and that will in turn iterate</span></span>
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<pre style="margin: 0;">+<span id="LC3356" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> level n.</span></span>
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3357
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<pre style="margin: 0;">+<span id="LC3357" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3358" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* What if a unification takes place at level n, in the ic_simples of</span></span>
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3359
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<pre style="margin: 0;">+<span id="LC3359" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> level n? No need to track this, because the kick-out mechanism deals</span></span>
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<pre style="margin: 0;">+<span id="LC3360" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> with it. (We can't drop kick-out in favour of iteration, becuase kick-out</span></span>
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3361
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<pre style="margin: 0;">+<span id="LC3361" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> works for skolem-equalities, not just unifications.)</span></span>
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3362
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<pre style="margin: 0;">+<span id="LC3362" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3363" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So the monad-global Unification Level Flag, kept in tcs_unif_lvl keeps</span></span>
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<pre style="margin: 0;">+<span id="LC3364" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">track of</span></span>
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3365
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<pre style="margin: 0;">+<span id="LC3365" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - Whether any unifications at all have taken place (Nothing => no unifications)</span></span>
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3366
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<pre style="margin: 0;">+<span id="LC3366" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - If so, what is the outermost level that has seen a unification (Just lvl)</span></span>
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3367
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<pre style="margin: 0;">+<span id="LC3367" class="line" lang="haskell"></span>
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3368
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<pre style="margin: 0;">+<span id="LC3368" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The iteration done in the simplify_loop/maybe_simplify_again loop in GHC.Tc.Solver.</span></span>
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3369
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<pre style="margin: 0;">+<span id="LC3369" class="line" lang="haskell"></span>
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3370
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<pre style="margin: 0;">+<span id="LC3370" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">It helpful not to iterate unless there is a chance of progress. #8474 is</span></span>
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3371
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<pre style="margin: 0;">+<span id="LC3371" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">an example:</span></span>
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3372
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<pre style="margin: 0;">+<span id="LC3372" class="line" lang="haskell"></span>
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3373
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<pre style="margin: 0;">+<span id="LC3373" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * There's a deeply-nested chain of implication constraints.</span></span>
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3374
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<pre style="margin: 0;">+<span id="LC3374" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ?x:alpha => ?y1:beta1 => ... ?yn:betan => [W] ?x:Int</span></span>
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3375
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<pre style="margin: 0;">+<span id="LC3375" class="line" lang="haskell"></span>
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3376
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<pre style="margin: 0;">+<span id="LC3376" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * From the innermost one we get a [D] alpha[1] ~ Int,</span></span>
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3377
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<pre style="margin: 0;">+<span id="LC3377" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> so we can unify.</span></span>
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3378
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<pre style="margin: 0;">+<span id="LC3378" class="line" lang="haskell"></span>
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3379
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<pre style="margin: 0;">+<span id="LC3379" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * It's better not to iterate the inner implications, but go all the</span></span>
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3380
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<pre style="margin: 0;">+<span id="LC3380" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> way out to level 1 before iterating -- because iterating level 1</span></span>
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3381
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<pre style="margin: 0;">+<span id="LC3381" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> will iterate the inner levels anyway.</span></span>
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3382
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<pre style="margin: 0;">+<span id="LC3382" class="line" lang="haskell"></span>
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3383
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<pre style="margin: 0;">+<span id="LC3383" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(In the olden days when we "floated" thse Derived constraints, this was</span></span>
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3384
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<pre style="margin: 0;">+<span id="LC3384" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">much, much more important -- we got exponential behaviour, as each iteration</span></span>
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3385
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<pre style="margin: 0;">+<span id="LC3385" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">produced the same Derived constraint.)</span></span>
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3386
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<pre style="margin: 0;">+<span id="LC3386" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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3387
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<pre style="margin: 0;">+<span id="LC3387" class="line" lang="haskell"></span>
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3388
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<pre style="margin: 0;">+<span id="LC3388" class="line" lang="haskell"></span>
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3389
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<pre style="margin: 0;">+<span id="LC3389" class="line" lang="haskell"><span class="n" style="color: #333;">resetUnificationFlag</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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3390
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<pre style="margin: 0;">+<span id="LC3390" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We are at ambient level i</span></span>
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3391
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<pre style="margin: 0;">+<span id="LC3391" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If the unification flag = Just i, reset it to Nothing and return True</span></span>
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3392
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<pre style="margin: 0;">+<span id="LC3392" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Otherwise leave it unchanged and return False</span></span>
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3393
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<pre style="margin: 0;">+<span id="LC3393" class="line" lang="haskell"><span class="n" style="color: #333;">resetUnificationFlag</span></span>
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3394
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<pre style="margin: 0;">+<span id="LC3394" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">-></span></span>
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3395
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<pre style="margin: 0;">+<span id="LC3395" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ref</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcs_unif_lvl</span> <span class="n" style="color: #333;">env</span></span>
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3396
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<pre style="margin: 0;">+<span id="LC3396" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">ambient_lvl</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">getTcLevel</span></span>
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3397
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<pre style="margin: 0;">+<span id="LC3397" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mb_lvl</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">readTcRef</span> <span class="n" style="color: #333;">ref</span></span>
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3398
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<pre style="margin: 0;">+<span id="LC3398" class="line" lang="haskell"> <span class="p">;</span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"resetUnificationFlag"</span> <span class="o" style="font-weight: 600;">$</span></span>
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3399
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<pre style="margin: 0;">+<span id="LC3399" class="line" lang="haskell"> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"ambient:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ambient_lvl</span></span>
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3400
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<pre style="margin: 0;">+<span id="LC3400" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"unif_lvl:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">mb_lvl</span> <span class="p">]</span></span>
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3401
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<pre style="margin: 0;">+<span id="LC3401" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">mb_lvl</span> <span class="kr" style="font-weight: 600;">of</span></span>
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3402
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<pre style="margin: 0;">+<span id="LC3402" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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3403
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<pre style="margin: 0;">+<span id="LC3403" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">unif_lvl</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">ambient_lvl</span> <span class="p">`</span><span class="n" style="color: #333;">strictlyDeeperThan</span><span class="p">`</span> <span class="n" style="color: #333;">unif_lvl</span></span>
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<td class="diff-line-num new new_line" data-linenumber="3404" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
3404
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<pre style="margin: 0;">+<span id="LC3404" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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3405
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<pre style="margin: 0;">+<span id="LC3405" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<td class="diff-line-num new new_line" data-linenumber="3406" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
3406
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<pre style="margin: 0;">+<span id="LC3406" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">writeTcRef</span> <span class="n" style="color: #333;">ref</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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3407
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<pre style="margin: 0;">+<span id="LC3407" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="p">}</span> <span class="p">}</span></span>
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3408
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<pre style="margin: 0;">+<span id="LC3408" class="line" lang="haskell"></span>
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3409
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<pre style="margin: 0;">+<span id="LC3409" class="line" lang="haskell"><span class="n" style="color: #333;">setUnificationFlag</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcLevel</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC3410" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (setUnificationFlag i) sets the unification level to (Just i)</span></span>
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<pre style="margin: 0;">+<span id="LC3411" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- unless it already is (Just j) where j <= i</span></span>
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<pre style="margin: 0;">+<span id="LC3412" class="line" lang="haskell"><span class="n" style="color: #333;">setUnificationFlag</span> <span class="n" style="color: #333;">lvl</span></span>
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3413
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<pre style="margin: 0;">+<span id="LC3413" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">-></span></span>
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3414
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<pre style="margin: 0;">+<span id="LC3414" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ref</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcs_unif_lvl</span> <span class="n" style="color: #333;">env</span></span>
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3415
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<pre style="margin: 0;">+<span id="LC3415" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mb_lvl</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">readTcRef</span> <span class="n" style="color: #333;">ref</span></span>
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3416
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<pre style="margin: 0;">+<span id="LC3416" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">mb_lvl</span> <span class="kr" style="font-weight: 600;">of</span></span>
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3417
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<pre style="margin: 0;">+<span id="LC3417" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">unif_lvl</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">lvl</span> <span class="p">`</span><span class="n" style="color: #333;">deeperThanOrSame</span><span class="p">`</span> <span class="n" style="color: #333;">unif_lvl</span></span>
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3418
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<pre style="margin: 0;">+<span id="LC3418" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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3419
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<pre style="margin: 0;">+<span id="LC3419" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">writeTcRef</span> <span class="n" style="color: #333;">ref</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">lvl</span><span class="p">)</span> <span class="p">}</span></span>
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3420
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<pre style="margin: 0;">+<span id="LC3420" class="line" lang="haskell"></span>
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3421
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<pre style="margin: 0;">+<span id="LC3421" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3422" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *********************************************************************</span></span>
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3264
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<pre style="margin: 0;"> <span id="LC3423" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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3265
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<pre style="margin: 0;"> <span id="LC3424" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Instantiation etc.</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4f85f14177d0b2be1c1489bc69ad4f69372e1fb4#3b6d78a50c8462304f843b952a88e531718dbbd2"><strong>compiler/GHC/Tc/Types/Constraint.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1095,7 +1095,7 @@ Yuk!</td>
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1095
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<pre style="margin: 0;"> <span id="LC1095" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1096" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Implication</span></span>
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1097
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<pre style="margin: 0;"> <span id="LC1097" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Implic</span> <span class="p">{</span> <span class="c1" style="color: #998; font-style: italic;">-- Invariants for a tree of implications:</span></span>
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1098
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<pre style="margin: 0;">-<span id="LC1098" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- see TcType Note [TcLevel <span class="idiff left right">and untouchable type variable</span>s]</span></span>
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<pre style="margin: 0;">+<span id="LC1098" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- see TcType Note [TcLevel <span class="idiff left right">invariant</span>s]</span></span>
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1099
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1099
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<pre style="margin: 0;"> <span id="LC1099" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1100" class="line" lang="haskell"> <span class="n" style="color: #333;">ic_tclvl</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcLevel</span><span class="p">,</span> <span class="c1" style="color: #998; font-style: italic;">-- TcLevel of unification variables</span></span>
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<pre style="margin: 0;"> <span id="LC1101" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- allocated /inside/ this implication</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1172,44 +1172,57 @@ data ImplicStatus</td>
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<pre style="margin: 0;"> <span id="LC1172" class="line" lang="haskell"></span>
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1173
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<pre style="margin: 0;"> <span id="LC1173" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">IC_Unsolved</span> <span class="c1" style="color: #998; font-style: italic;">-- Neither of the above; might go either way</span></span>
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1174
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1174
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<pre style="margin: 0;"> <span id="LC1174" class="line" lang="haskell"></span>
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1175
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<pre style="margin: 0;">-<span id="LC1175" class="line" lang="haskell"><span class="cd">-- | Does this implication have Given equalities?</span></span>
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1176
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<pre style="margin: 0;">-<span id="LC1176" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [When does an implication have given equalities?] in GHC.Tc.Solver.Monad,</span></span>
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1177
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<pre style="margin: 0;">-<span id="LC1177" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- which also explains why we need three options here. Also, see</span></span>
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1178
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<pre style="margin: 0;">-<span id="LC1178" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note [Suppress redundant givens during error reporting] in GHC.Tc.Errors</span></span>
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1179
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<pre style="margin: 0;">-<span id="LC1179" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1180
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<pre style="margin: 0;">-<span id="LC1180" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Stops floating | Suppresses Givens in errors</span></span>
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1181
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<pre style="margin: 0;">-<span id="LC1181" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- -----------------------------------------------</span></span>
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1182
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<pre style="margin: 0;">-<span id="LC1182" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- NoGivenEqs NO | YES</span></span>
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1183
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<pre style="margin: 0;">-<span id="LC1183" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- LocalGivenEqs NO | NO</span></span>
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1184
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<pre style="margin: 0;">-<span id="LC1184" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- MaybeGivenEqs YES | NO</span></span>
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1185
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<pre style="margin: 0;">-<span id="LC1185" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1186
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<pre style="margin: 0;">-<span id="LC1186" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Examples:</span></span>
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1187
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<pre style="margin: 0;">-<span id="LC1187" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1188
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<pre style="margin: 0;">-<span id="LC1188" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- NoGivenEqs: Eq a => ...</span></span>
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1189
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<pre style="margin: 0;">-<span id="LC1189" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (Show a, Num a) => ...</span></span>
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1190
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<pre style="margin: 0;">-<span id="LC1190" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- forall a. a ~ Either Int Bool => ...</span></span>
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1191
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<pre style="margin: 0;">-<span id="LC1191" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Let-bound skolems] in GHC.Tc.Solver.Monad for</span></span>
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1192
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<pre style="margin: 0;">-<span id="LC1192" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- that last one</span></span>
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1193
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<pre style="margin: 0;">-<span id="LC1193" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1194
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<pre style="margin: 0;">-<span id="LC1194" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- LocalGivenEqs: forall a b. F a ~ G b => ...</span></span>
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1195
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<pre style="margin: 0;">-<span id="LC1195" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- forall a. F a ~ Int => ...</span></span>
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1196
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<pre style="margin: 0;">-<span id="LC1196" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1197
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<pre style="margin: 0;">-<span id="LC1197" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- MaybeGivenEqs: (a ~ b) => ...</span></span>
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1198
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<pre style="margin: 0;">-<span id="LC1198" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- forall a. F a ~ b => ...</span></span>
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1199
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<pre style="margin: 0;">-<span id="LC1199" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1200
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<pre style="margin: 0;">-<span id="LC1200" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The check is conservative. A MaybeGivenEqs might not have any equalities.</span></span>
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1201
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<pre style="margin: 0;">-<span id="LC1201" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- A LocalGivenEqs might local equalities, but it definitely does not have non-local</span></span>
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1202
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<pre style="margin: 0;">-<span id="LC1202" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- equalities. A NoGivenEqs definitely does not have equalities (except let-bound</span></span>
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1203
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<pre style="margin: 0;">-<span id="LC1203" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- skolems).</span></span>
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1204
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<pre style="margin: 0;">-<span id="LC1204" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">HasGivenEqs</span></span>
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1205
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<pre style="margin: 0;">-<span id="LC1205" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NoGivenEqs</span> <span class="c1" style="color: #998; font-style: italic;">-- definitely no given equalities,</span></span>
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1206
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<pre style="margin: 0;">-<span id="LC1206" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- except by Note [Let-bound skolems] in GHC.Tc.Solver.Monad</span></span>
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1207
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<pre style="margin: 0;">-<span id="LC1207" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">LocalGivenEqs</span> <span class="c1" style="color: #998; font-style: italic;">-- might have Given equalities that affect only local skolems</span></span>
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1208
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<pre style="margin: 0;">-<span id="LC1208" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- e.g. forall a b. (a ~ F b) => ...; definitely no others</span></span>
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1209
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<pre style="margin: 0;">-<span id="LC1209" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeGivenEqs</span> <span class="c1" style="color: #998; font-style: italic;">-- might have any kind of Given equalities; no floating out</span></span>
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1210
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<pre style="margin: 0;">-<span id="LC1210" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- is possible.</span></span>
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1175
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<pre style="margin: 0;">+<span id="LC1175" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">HasGivenEqs</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [HasGivenEqs]</span></span>
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1176
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<pre style="margin: 0;">+<span id="LC1176" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NoGivenEqs</span> <span class="c1" style="color: #998; font-style: italic;">-- Definitely no given equalities,</span></span>
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1177
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<pre style="margin: 0;">+<span id="LC1177" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- except by Note [Let-bound skolems] in GHC.Tc.Solver.Monad</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1178" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1178
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<pre style="margin: 0;">+<span id="LC1178" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">LocalGivenEqs</span> <span class="c1" style="color: #998; font-style: italic;">-- Might have Given equalities, but only ones that affect only</span></span>
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1179
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<pre style="margin: 0;">+<span id="LC1179" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- local skolems e.g. forall a b. (a ~ F b) => ...</span></span>
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1180
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<pre style="margin: 0;">+<span id="LC1180" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeGivenEqs</span> <span class="c1" style="color: #998; font-style: italic;">-- Might have any kind of Given equalities; no floating out</span></span>
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1181
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<pre style="margin: 0;">+<span id="LC1181" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- is possible.</span></span>
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1211
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1182
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<pre style="margin: 0;"> <span id="LC1182" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span></span>
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1212
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1183
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<pre style="margin: 0;"> <span id="LC1183" class="line" lang="haskell"></span>
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1184
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<pre style="margin: 0;">+<span id="LC1184" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [HasGivenEqs]</span></span>
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1185
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<pre style="margin: 0;">+<span id="LC1185" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~</span></span>
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1186
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<pre style="margin: 0;">+<span id="LC1186" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The GivenEqs data type describes the Given constraints of an implication constraint:</span></span>
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1187
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<pre style="margin: 0;">+<span id="LC1187" class="line" lang="haskell"></span>
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1188
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<pre style="margin: 0;">+<span id="LC1188" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* NoGivenEqs: definitely no Given equalities, except perhaps let-bound skolems</span></span>
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1189
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<pre style="margin: 0;">+<span id="LC1189" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> which don't count: see Note [Let-bound skolems] in GHC.Tc.Solver.Monad</span></span>
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1190
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<pre style="margin: 0;">+<span id="LC1190" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Examples: forall a. Eq a => ...</span></span>
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1191
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<pre style="margin: 0;">+<span id="LC1191" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> forall a. (Show a, Num a) => ...</span></span>
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1192
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<pre style="margin: 0;">+<span id="LC1192" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> forall a. a ~ Either Int Bool => ... -- Let-bound skolem</span></span>
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1193
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<pre style="margin: 0;">+<span id="LC1193" class="line" lang="haskell"></span>
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1194
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<pre style="margin: 0;">+<span id="LC1194" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* LocalGivenEqs: definitely no Given equalities that would affect principal</span></span>
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1195
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<pre style="margin: 0;">+<span id="LC1195" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> types. But may have equalities that affect only skolems of this implication</span></span>
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1196
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<pre style="margin: 0;">+<span id="LC1196" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (and hence do not affect princial types)</span></span>
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1197
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<pre style="margin: 0;">+<span id="LC1197" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Examples: forall a. F a ~ Int => ...</span></span>
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1198
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<pre style="margin: 0;">+<span id="LC1198" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> forall a b. F a ~ G b => ...</span></span>
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1199
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<pre style="margin: 0;">+<span id="LC1199" class="line" lang="haskell"></span>
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1200
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<pre style="margin: 0;">+<span id="LC1200" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* MaybeGivenEqs: may have Given equalities that would affect principal</span></span>
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1201
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<pre style="margin: 0;">+<span id="LC1201" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> types</span></span>
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1202
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<pre style="margin: 0;">+<span id="LC1202" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Examples: forall. (a ~ b) => ...</span></span>
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1203
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<pre style="margin: 0;">+<span id="LC1203" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> forall a. F a ~ b => ...</span></span>
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1204
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<pre style="margin: 0;">+<span id="LC1204" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> forall a. c a => ... -- The 'c' might be instantiated to (b ~)</span></span>
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1205
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<pre style="margin: 0;">+<span id="LC1205" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> forall a. C a b => ....</span></span>
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1206
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<pre style="margin: 0;">+<span id="LC1206" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> where class x~y => C a b</span></span>
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1207
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<pre style="margin: 0;">+<span id="LC1207" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> so there is an equality in the superclass of a Given</span></span>
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1208
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<pre style="margin: 0;">+<span id="LC1208" class="line" lang="haskell"></span>
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1209
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<pre style="margin: 0;">+<span id="LC1209" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The HasGivenEqs classifications affect two things:</span></span>
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1210
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<pre style="margin: 0;">+<span id="LC1210" class="line" lang="haskell"></span>
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1211
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<pre style="margin: 0;">+<span id="LC1211" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Suppressing redundant givens during error reporting; see GHC.Tc.Errors</span></span>
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1212
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<pre style="margin: 0;">+<span id="LC1212" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Note [Suppress redundant givens during error reporting]</span></span>
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1213
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<pre style="margin: 0;">+<span id="LC1213" class="line" lang="haskell"></span>
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1214
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<pre style="margin: 0;">+<span id="LC1214" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Floating in approximateWC.</span></span>
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1215
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<pre style="margin: 0;">+<span id="LC1215" class="line" lang="haskell"></span>
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1216
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<pre style="margin: 0;">+<span id="LC1216" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Specifically, here's how it goes:</span></span>
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1217
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<pre style="margin: 0;">+<span id="LC1217" class="line" lang="haskell"></span>
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1218
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<pre style="margin: 0;">+<span id="LC1218" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Stops floating | Suppresses Givens in errors</span></span>
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1219
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<pre style="margin: 0;">+<span id="LC1219" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in approximateWC |</span></span>
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1220
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<pre style="margin: 0;">+<span id="LC1220" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -----------------------------------------------</span></span>
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1221
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<pre style="margin: 0;">+<span id="LC1221" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> NoGivenEqs NO | YES</span></span>
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1222
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<pre style="margin: 0;">+<span id="LC1222" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> LocalGivenEqs NO | NO</span></span>
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1223
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<pre style="margin: 0;">+<span id="LC1223" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MaybeGivenEqs YES | NO</span></span>
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1224
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<pre style="margin: 0;">+<span id="LC1224" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1225
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<pre style="margin: 0;">+<span id="LC1225" class="line" lang="haskell"></span>
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1213
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1226
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<pre style="margin: 0;"> <span id="LC1226" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">Implication</span> <span class="kr" style="font-weight: 600;">where</span></span>
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1214
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1227
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<pre style="margin: 0;"> <span id="LC1227" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Implic</span> <span class="p">{</span> <span class="n" style="color: #333;">ic_tclvl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tclvl</span><span class="p">,</span> <span class="n" style="color: #333;">ic_skols</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">skols</span></span>
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<pre style="margin: 0;"> <span id="LC1228" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ic_given</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">given</span><span class="p">,</span> <span class="n" style="color: #333;">ic_given_eqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">given_eqs</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4f85f14177d0b2be1c1489bc69ad4f69372e1fb4#f021c52a6ccf306e88c9f760b2aee33b180ba341"><strong>compiler/GHC/Tc/Utils/Env.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -692,7 +692,8 @@ tcCheckUsage name id_mult thing_inside</td>
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<pre style="margin: 0;"> <span id="LC692" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;"> <span id="LC693" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- It works nicely in practice.</span></span>
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<pre style="margin: 0;"> <span id="LC694" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">promote_mult</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapTyCo</span> <span class="n" style="color: #333;">mapper</span></span>
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<pre style="margin: 0;">-<span id="LC695" class="line" lang="haskell"> <span class="n" style="color: #333;">mapper</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TyCoMapper</span> <span class="p">{</span> <span class="n" style="color: #333;">tcm_tyvar</span> <span class="o" style="font-weight: 600;">=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="nb" style="color: #0086b3;">()</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">promoteTyVar</span> <span class="n" style="color: #333;">tv</span></span>
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<pre style="margin: 0;">+<span id="LC695" class="line" lang="haskell"> <span class="n" style="color: #333;">mapper</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TyCoMapper</span> <span class="p">{</span> <span class="n" style="color: #333;">tcm_tyvar</span> <span class="o" style="font-weight: 600;">=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="nb" style="color: #0086b3;">()</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">tclvl</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getTcLevel</span></span>
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<pre style="margin: 0;">+<span id="LC696" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">promoteMetaTyVarTo</span> <span class="n" style="color: #333;">tclvl</span> <span class="n" style="color: #333;">tv</span></span>
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<pre style="margin: 0;"> <span id="LC697" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">zonkTcTyVar</span> <span class="n" style="color: #333;">tv</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC698" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcm_covar</span> <span class="o" style="font-weight: 600;">=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="nb" style="color: #0086b3;">()</span> <span class="n" style="color: #333;">cv</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkCoVarCo</span> <span class="n" style="color: #333;">cv</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC699" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcm_hole</span> <span class="o" style="font-weight: 600;">=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="nb" style="color: #0086b3;">()</span> <span class="n" style="color: #333;">h</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkHoleCo</span> <span class="n" style="color: #333;">h</span><span class="p">)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4f85f14177d0b2be1c1489bc69ad4f69372e1fb4#c6e4263ee64c68e57b7525127d98243fce38b1ea"><strong>compiler/GHC/Tc/Utils/Monad.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1865,7 +1865,7 @@ It's distressingly delicate though:</td>
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<pre style="margin: 0;"> <span id="LC1865" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> class constraints mentioned above. But we may /also/ end up taking</span></span>
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<pre style="margin: 0;"> <span id="LC1866" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> constraints built at some inner level, and emitting them at some</span></span>
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<pre style="margin: 0;"> <span id="LC1867" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> outer level, and then breaking the TcLevel invariants</span></span>
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<pre style="margin: 0;">-<span id="LC1868" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> See Note [TcLevel <span class="idiff left right">and untouchable type variable</span>s] in GHC.Tc.Utils.TcType</span></span>
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<pre style="margin: 0;">+<span id="LC1868" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> See Note [TcLevel <span class="idiff left right">invariant</span>s] in GHC.Tc.Utils.TcType</span></span>
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<pre style="margin: 0;"> <span id="LC1869" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1870" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So dropMisleading has a horridly ad-hoc structure. It keeps only</span></span>
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<pre style="margin: 0;"> <span id="LC1871" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">/insoluble/ flat constraints (which are unlikely to very visibly trip</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4f85f14177d0b2be1c1489bc69ad4f69372e1fb4#94c96afe1bb3b771ffbcfeeca34ce43ebbe76ccb"><strong>compiler/GHC/Tc/Utils/TcMType.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -80,7 +80,7 @@ module GHC.Tc.Utils.TcMType (</td>
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<pre style="margin: 0;"> <span id="LC80" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC81" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">---------------------------------</span></span>
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<pre style="margin: 0;"> <span id="LC82" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Promotion, defaulting, skolemisation</span></span>
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<pre style="margin: 0;">-<span id="LC83" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">defaultTyVar</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">promote<span class="idiff left right">TyVar</span></span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">promoteTyVarSet</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC83" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">defaultTyVar</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">promote<span class="idiff left right">MetaTyVarTo</span></span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">promoteTyVarSet</span><span class="p">,</span></span>
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84
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84
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<pre style="margin: 0;"> <span id="LC84" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">quantifyTyVars</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isQuantifiableTv</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC85" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">skolemiseUnboundMetaTyVar</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">zonkAndSkolemise</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">skolemiseQuantifiedTyVar</span><span class="p">,</span></span>
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86
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86
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<pre style="margin: 0;"> <span id="LC86" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -964,12 +964,18 @@ writeMetaTyVarRef tyvar ref ty</td>
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<pre style="margin: 0;"> <span id="LC964" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">writeTcRef</span> <span class="n" style="color: #333;">ref</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Indirect</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC965" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC966" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Everything from here on only happens if DEBUG is on</span></span>
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<pre style="margin: 0;">+<span id="LC967" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Need to zonk 'ty' because we may only recently have promoted</span></span>
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<pre style="margin: 0;">+<span id="LC968" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- its free meta-tyvars (see Solver.Interact.tryToSolveByUnification)</span></span>
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969
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<pre style="margin: 0;"> <span id="LC969" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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970
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<pre style="margin: 0;"> <span id="LC970" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">meta_details</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">readMutVar</span> <span class="n" style="color: #333;">ref</span><span class="p">;</span></span>
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969
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<pre style="margin: 0;"> <span id="LC971" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Zonk kinds to allow the error check to work</span></span>
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970
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<pre style="margin: 0;"> <span id="LC972" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">zonked_tv_kind</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkTcType</span> <span class="n" style="color: #333;">tv_kind</span></span>
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971
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<pre style="margin: 0;">-<span id="LC971" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">zonked_ty_kind</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkTcType</span> <span class="n" style="color: #333;">ty_kind</span></span>
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972
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<pre style="margin: 0;">-<span id="LC972" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">kind_check_ok</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcIsConstraintKind</span> <span class="n" style="color: #333;">zonked_tv_kind</span></span>
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<pre style="margin: 0;">+<span id="LC973" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">zonked_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkTcType</span> <span class="n" style="color: #333;">ty</span></span>
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974
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<pre style="margin: 0;">+<span id="LC974" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">zonked_ty_kind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcTypeKind</span> <span class="n" style="color: #333;">zonked_ty</span></span>
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975
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<pre style="margin: 0;">+<span id="LC975" class="line" lang="haskell"> <span class="n" style="color: #333;">zonked_ty_lvl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcTypeLevel</span> <span class="n" style="color: #333;">zonked_ty</span></span>
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<pre style="margin: 0;">+<span id="LC976" class="line" lang="haskell"> <span class="n" style="color: #333;">level_check_ok</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">zonked_ty_lvl</span> <span class="p">`</span><span class="n" style="color: #333;">strictlyDeeperThan</span><span class="p">`</span> <span class="n" style="color: #333;">tv_lvl</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC977" class="line" lang="haskell"> <span class="n" style="color: #333;">level_check_msg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">zonked_ty_lvl</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tv_lvl</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tyvar</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC978" class="line" lang="haskell"> <span class="n" style="color: #333;">kind_check_ok</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcIsConstraintKind</span> <span class="n" style="color: #333;">zonked_tv_kind</span></span>
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979
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<pre style="margin: 0;"> <span id="LC979" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">tcEqKind</span> <span class="n" style="color: #333;">zonked_ty_kind</span> <span class="n" style="color: #333;">zonked_tv_kind</span></span>
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<pre style="margin: 0;"> <span id="LC980" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Hack alert! tcIsConstraintKind: see GHC.Tc.Gen.HsType</span></span>
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<pre style="margin: 0;"> <span id="LC981" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Extra-constraint holes in partial type signatures]</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -994,13 +1000,9 @@ writeMetaTyVarRef tyvar ref ty</td>
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<pre style="margin: 0;"> <span id="LC1000" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">writeMutVar</span> <span class="n" style="color: #333;">ref</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Indirect</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="p">}</span></span>
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1001
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<pre style="margin: 0;"> <span id="LC1001" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC1002" class="line" lang="haskell"> <span class="n" style="color: #333;">tv_kind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyVarKind</span> <span class="n" style="color: #333;">tyvar</span></span>
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<pre style="margin: 0;">-<span id="LC997" class="line" lang="haskell"> <span class="n" style="color: #333;">ty_kind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcTypeKind</span> <span class="n" style="color: #333;">ty</span></span>
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1003
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<pre style="margin: 0;"> <span id="LC1003" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1004" class="line" lang="haskell"> <span class="n" style="color: #333;">tv_lvl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcTyVarLevel</span> <span class="n" style="color: #333;">tyvar</span></span>
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<pre style="margin: 0;">-<span id="LC1000" class="line" lang="haskell"> <span class="n" style="color: #333;">ty_lvl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcTypeLevel</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC1005" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1002" class="line" lang="haskell"> <span class="n" style="color: #333;">level_check_ok</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">ty_lvl</span> <span class="p">`</span><span class="n" style="color: #333;">strictlyDeeperThan</span><span class="p">`</span> <span class="n" style="color: #333;">tv_lvl</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1003" class="line" lang="haskell"> <span class="n" style="color: #333;">level_check_msg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty_lvl</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tv_lvl</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tyvar</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC1006" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1007" class="line" lang="haskell"> <span class="n" style="color: #333;">double_upd_msg</span> <span class="n" style="color: #333;">details</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Double update of meta tyvar"</span><span class="p">)</span></span>
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1006
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1008
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<pre style="margin: 0;"> <span id="LC1008" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tyvar</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">details</span><span class="p">)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1569,8 +1571,8 @@ than the ambient level (see Note [Use level numbers of quantification]).</td>
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1571
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<pre style="margin: 0;"> <span id="LC1571" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Use level numbers for quantification]</span></span>
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1570
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1572
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<pre style="margin: 0;"> <span id="LC1572" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1571
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1573
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<pre style="margin: 0;"> <span id="LC1573" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The level numbers assigned to metavariables are very useful. Not only</span></span>
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1572
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<pre style="margin: 0;">-<span id="LC1572" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">do they track touchability (Note [TcLevel <span class="idiff left right">and untouchable type variables]</span></span></span>
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1573
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<pre style="margin: 0;">-<span id="LC1573" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">in GHC.Tc.Utils.TcType), </span>but they also allow us to determine which variables to</span></span>
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1574
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<pre style="margin: 0;">+<span id="LC1574" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">do they track touchability (Note [TcLevel <span class="idiff left right">invariants] in GHC.Tc.Utils.TcType),</span></span></span>
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<pre style="margin: 0;">+<span id="LC1575" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">but they also allow us to determine which variables to</span></span>
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1576
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<pre style="margin: 0;"> <span id="LC1576" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">generalise. The rule is this:</span></span>
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1577
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<pre style="margin: 0;"> <span id="LC1577" class="line" lang="haskell"></span>
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1576
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1578
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<pre style="margin: 0;"> <span id="LC1578" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> When generalising, quantify only metavariables with a TcLevel greater</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2004,29 +2006,31 @@ a \/\a in the final result but all the occurrences of a will be zonked to ()</td>
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2004
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2006
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<pre style="margin: 0;"> <span id="LC2006" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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2005
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2007
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<pre style="margin: 0;"> <span id="LC2007" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">********************************************************************* -}</span></span>
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2006
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2008
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<pre style="margin: 0;"> <span id="LC2008" class="line" lang="haskell"></span>
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2007
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<pre style="margin: 0;">-<span id="LC2007" class="line" lang="haskell"><span class="n" style="color: #333;">promote<span class="idiff left">TyVar</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">::</span></span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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2009
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<pre style="margin: 0;">+<span id="LC2009" class="line" lang="haskell"><span class="n" style="color: #333;">promote<span class="idiff left">MetaTyVarTo</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TcLevel</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">-></span></span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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2008
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2010
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<pre style="margin: 0;"> <span id="LC2010" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- When we float a constraint out of an implication we must restore</span></span>
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2009
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<pre style="margin: 0;">-<span id="LC2009" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- invariant (WantedInv) in Note [TcLevel <span class="idiff left right">and untouchable type variable</span>s] in GHC.Tc.Utils.TcType</span></span>
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2011
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<pre style="margin: 0;">+<span id="LC2011" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- invariant (WantedInv) in Note [TcLevel <span class="idiff left right">invariant</span>s] in GHC.Tc.Utils.TcType</span></span>
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2010
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2012
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<pre style="margin: 0;"> <span id="LC2012" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Return True <=> we did some promotion</span></span>
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2011
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2013
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<pre style="margin: 0;"> <span id="LC2013" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Also returns either the original tyvar (no promotion) or the new one</span></span>
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<pre style="margin: 0;"> <span id="LC2014" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Promoting unification variables]</span></span>
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<pre style="margin: 0;">-<span id="LC2013" class="line" lang="haskell"><span class="n" style="color: #333;">promote<span class="idiff left right">TyVar</span></span> <span class="n" style="color: #333;">tv</span></span>
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2014
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<pre style="margin: 0;">-<span id="LC2014" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><span class="idiff left">=</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">do</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tclvl</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">getTcLevel</span></span></span>
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<pre style="margin: 0;">-<span id="LC2015" class="line" lang="haskell"> <span class="idiff left"> </span><span class="p"><span class="idiff">;</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">if</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">isFloatedTouchableMetaTyVar</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tclvl</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tv</span></span><span class="p"><span class="idiff right">)</span></span></span>
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2016
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<pre style="margin: 0;">-<span id="LC2016" class="line" lang="haskell"> <span class="idiff left"> </span><span class="kr" style="font-weight: 600;"><span class="idiff right">then</span></span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">cloned_tv</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">cloneMetaTyVar</span> <span class="n" style="color: #333;">tv</span></span>
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2017
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<pre style="margin: 0;">-<span id="LC2017" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">rhs_tv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setMetaTyVarTcLevel</span> <span class="n" style="color: #333;">cloned_tv</span> <span class="n" style="color: #333;">tclvl</span></span>
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2018
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<pre style="margin: 0;">-<span id="LC2018" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="p">;</span> <span class="n" style="color: #333;">writeMetaTyVar</span> <span class="n" style="color: #333;">tv</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">rhs_tv</span><span class="p">)</span></span>
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2019
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<pre style="margin: 0;">-<span id="LC2019" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"promoteTyVar"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"-->"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">rhs_tv</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC2020" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC2021" class="line" lang="haskell"> <span class="idiff left"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">else</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">do</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">traceTc</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"promoteTyVar: no"</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tv</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">-<span id="LC2022" class="line" lang="haskell"> <span class="idiff left"> </span><span class="p"><span class="idiff">;</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">return</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">False</span></span><span class="idiff"> </span><span class="p"><span class="idiff">}</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">}</span></span></span>
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<pre style="margin: 0;">+<span id="LC2015" class="line" lang="haskell"><span class="n" style="color: #333;">promote<span class="idiff left">MetaTyVarTo</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">tclvl</span></span> <span class="n" style="color: #333;">tv</span></span>
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<pre style="margin: 0;">+<span id="LC2016" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><span class="idiff left">|</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">ASSERT2</span></span><span class="p"><span class="idiff">(</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">isMetaTyVar</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tv</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tv</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC2017" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">tcTyVarLevel</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tv</span></span><span class="idiff"> </span><span class="p"><span class="idiff">`</span></span><span class="n" style="color: #333;"><span class="idiff">strictlyDeeperThan</span></span><span class="p"><span class="idiff">`</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">tclvl</span></span></span>
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2018
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<pre style="margin: 0;">+<span id="LC2018" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><span class="idiff left right">=</span></span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">cloned_tv</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">cloneMetaTyVar</span> <span class="n" style="color: #333;">tv</span></span>
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2019
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<pre style="margin: 0;">+<span id="LC2019" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">rhs_tv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setMetaTyVarTcLevel</span> <span class="n" style="color: #333;">cloned_tv</span> <span class="n" style="color: #333;">tclvl</span></span>
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<pre style="margin: 0;">+<span id="LC2020" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">writeMetaTyVar</span> <span class="n" style="color: #333;">tv</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">rhs_tv</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2021" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"promoteTyVar"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"-->"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">rhs_tv</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2022" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="p">}</span></span>
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2023
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<pre style="margin: 0;">+<span id="LC2023" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><span class="idiff left">|</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">otherwise</span></span></span>
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2024
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<pre style="margin: 0;">+<span id="LC2024" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><span class="idiff left">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">return</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">False</span></span></span>
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2025
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<pre style="margin: 0;"> <span id="LC2025" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2026" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returns whether or not *any* tyvar is defaulted</span></span>
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<pre style="margin: 0;"> <span id="LC2027" class="line" lang="haskell"><span class="n" style="color: #333;">promoteTyVarSet</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVarSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;"> <span id="LC2028" class="line" lang="haskell"><span class="n" style="color: #333;">promoteTyVarSet</span> <span class="n" style="color: #333;">tvs</span></span>
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<pre style="margin: 0;">-<span id="LC2027" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">bools</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">promoteTyVar</span> <span class="p">(</span><span class="n" style="color: #333;">nonDetEltsUniqSet</span> <span class="n" style="color: #333;">tvs</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2029" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">tclvl</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getTcLevel</span></span>
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<pre style="margin: 0;">+<span id="LC2030" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">bools</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">promoteMetaTyVarTo</span> <span class="n" style="color: #333;">tclvl</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC2031" class="line" lang="haskell"> <span class="n" style="color: #333;">filter</span> <span class="n" style="color: #333;">isPromotableMetaTyVar</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC2032" class="line" lang="haskell"> <span class="n" style="color: #333;">nonDetEltsUniqSet</span> <span class="n" style="color: #333;">tvs</span></span>
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<pre style="margin: 0;"> <span id="LC2033" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Non-determinism is OK because order of promotion doesn't matter</span></span>
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<pre style="margin: 0;">-<span id="LC2029" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2034" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">or</span> <span class="n" style="color: #333;">bools</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC2035" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2036" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4f85f14177d0b2be1c1489bc69ad4f69372e1fb4#5461e7beeb7ae73d7c01f720cbaa3fa2c5333590"><strong>compiler/GHC/Tc/Utils/TcType.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -33,7 +33,7 @@ module GHC.Tc.Utils.TcType (</td>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- TcLevel</span></span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TcLevel</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">topTcLevel</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pushTcLevel</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isTopTcLevel</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC36" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">strictlyDeeperThan</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">sameDepthAs</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">strictlyDeeperThan</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left">deeperThanOrSame</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff right"> </span><span class="nf" style="color: #900; font-weight: 600;">sameDepthAs</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcTypeLevel</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcTyVarLevel</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">maxTcLevel</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">promoteSkolem</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">promoteSkolemX</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">promoteSkolemsX</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--------------------------------</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -45,8 +45,7 @@ module GHC.Tc.Utils.TcType (</td>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isAmbiguousTyVar</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isCycleBreakerTyVar</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">metaTyVarRef</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">metaTyVarInfo</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isFlexi</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isIndirect</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isRuntimeUnkSkol</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">metaTyVarTcLevel</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">setMetaTyVarTcLevel</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">metaTyVarTcLevel_maybe</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC48" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isTouchableMetaTyVar</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC49" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isFloatedTouchableMetaTyVar</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC48" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isTouchableMetaTyVar</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isPromotableMetaTyVar</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">findDupTyVarTvs</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkTyVarNamePairs</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--------------------------------</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -516,7 +515,7 @@ data TcTyVarDetails</td>
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<pre style="margin: 0;"> <span id="LC515" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC516" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">MetaTv</span> <span class="p">{</span> <span class="n" style="color: #333;">mtv_info</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">MetaInfo</span></span>
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<pre style="margin: 0;"> <span id="LC517" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">mtv_ref</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IORef</span> <span class="kt" style="color: #458; font-weight: 600;">MetaDetails</span></span>
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519
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<pre style="margin: 0;">-<span id="LC519" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">mtv_tclvl</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcLevel</span> <span class="p">}</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [TcLevel <span class="idiff left right">and untouchable type variable</span>s]</span></span>
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<pre style="margin: 0;">+<span id="LC518" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">mtv_tclvl</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcLevel</span> <span class="p">}</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [TcLevel <span class="idiff left right">invariant</span>s]</span></span>
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<pre style="margin: 0;"> <span id="LC519" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC520" class="line" lang="haskell"><span class="n" style="color: #333;">vanillaSkolemTv</span><span class="p">,</span> <span class="n" style="color: #333;">superSkolemTv</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVarDetails</span></span>
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<pre style="margin: 0;"> <span id="LC521" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Binding when looking up instances] in GHC.Core.InstEnv</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -574,13 +573,14 @@ instance Outputable MetaInfo where</td>
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<pre style="margin: 0;"> <span id="LC573" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">********************************************************************* -}</span></span>
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<pre style="margin: 0;"> <span id="LC574" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC575" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">TcLevel</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TcLevel</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="kr" style="font-weight: 600;">deriving</span><span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Ord</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC577" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [TcLevel <span class="idiff left right">and untouchable type variable</span>s] for what this Int is</span></span>
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<pre style="margin: 0;">+<span id="LC576" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [TcLevel <span class="idiff left right">invariant</span>s] for what this Int is</span></span>
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<pre style="margin: 0;"> <span id="LC577" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See also Note [TcLevel assignment]</span></span>
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<pre style="margin: 0;"> <span id="LC578" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC579" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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<pre style="margin: 0;">-<span id="LC581" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [TcLevel <span class="idiff left right">and untouchable type variable</span>s]</span></span>
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<pre style="margin: 0;">-<span id="LC582" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~<span class="idiff left right">~~~~~~~~~~~~~~~~~~~~</span></span></span>
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<pre style="margin: 0;">+<span id="LC580" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [TcLevel <span class="idiff left right">invariant</span>s]</span></span>
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<pre style="margin: 0;">+<span id="LC581" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;"> <span id="LC582" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Each unification variable (MetaTv)</span></span>
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<pre style="margin: 0;">+<span id="LC583" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> and skolem (SkolemTv)</span></span>
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<pre style="margin: 0;"> <span id="LC584" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> and each Implication</span></span>
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<pre style="margin: 0;"> <span id="LC585" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> has a level number (of type TcLevel)</span></span>
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<pre style="margin: 0;"> <span id="LC586" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -602,9 +602,8 @@ Note [TcLevel and untouchable type variables]</td>
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<pre style="margin: 0;"> <span id="LC602" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> LESS THAN OR EQUAL TO the ic_tclvl of I</span></span>
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<pre style="margin: 0;"> <span id="LC603" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> See Note [WantedInv]</span></span>
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<pre style="margin: 0;"> <span id="LC604" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC605" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* A unification variable is *touchable* if its level number</span></span>
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<pre style="margin: 0;">-<span id="LC606" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> is EQUAL TO that of its immediate parent implication,</span></span>
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<pre style="margin: 0;">-<span id="LC607" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> and it is a TauTv or TyVarTv (but /not/ CycleBreakerTv)</span></span>
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<pre style="margin: 0;">+<span id="LC605" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The level of a MetaTyVar also governs its untouchability. See</span></span>
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<pre style="margin: 0;">+<span id="LC606" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Unification preconditions] in GHC.Tc.Utils.Unify.</span></span>
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<pre style="margin: 0;"> <span id="LC607" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC608" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [WantedInv]</span></span>
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<pre style="margin: 0;"> <span id="LC609" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -679,13 +678,17 @@ strictlyDeeperThan :: TcLevel -> TcLevel -> Bool</td>
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<pre style="margin: 0;"> <span id="LC678" class="line" lang="haskell"><span class="n" style="color: #333;">strictlyDeeperThan</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcLevel</span> <span class="n" style="color: #333;">tv_tclvl</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcLevel</span> <span class="n" style="color: #333;">ctxt_tclvl</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC679" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tv_tclvl</span> <span class="o" style="font-weight: 600;">></span> <span class="n" style="color: #333;">ctxt_tclvl</span></span>
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<pre style="margin: 0;"> <span id="LC680" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC681" class="line" lang="haskell"><span class="n" style="color: #333;">deeperThanOrSame</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcLevel</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcLevel</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC682" class="line" lang="haskell"><span class="n" style="color: #333;">deeperThanOrSame</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcLevel</span> <span class="n" style="color: #333;">tv_tclvl</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcLevel</span> <span class="n" style="color: #333;">ctxt_tclvl</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC683" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tv_tclvl</span> <span class="o" style="font-weight: 600;">>=</span> <span class="n" style="color: #333;">ctxt_tclvl</span></span>
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<pre style="margin: 0;">+<span id="LC684" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC685" class="line" lang="haskell"><span class="n" style="color: #333;">sameDepthAs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcLevel</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcLevel</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;"> <span id="LC686" class="line" lang="haskell"><span class="n" style="color: #333;">sameDepthAs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcLevel</span> <span class="n" style="color: #333;">ctxt_tclvl</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcLevel</span> <span class="n" style="color: #333;">tv_tclvl</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC687" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctxt_tclvl</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">tv_tclvl</span> <span class="c1" style="color: #998; font-style: italic;">-- NB: invariant ctxt_tclvl >= tv_tclvl</span></span>
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<pre style="margin: 0;"> <span id="LC688" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- So <= would be equivalent</span></span>
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<pre style="margin: 0;"> <span id="LC689" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC690" class="line" lang="haskell"><span class="n" style="color: #333;">checkTcLevelInvariant</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcLevel</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcLevel</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">-<span id="LC688" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Checks (WantedInv) from Note [TcLevel <span class="idiff left right">and untouchable type variable</span>s]</span></span>
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<pre style="margin: 0;">+<span id="LC691" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Checks (WantedInv) from Note [TcLevel <span class="idiff left right">invariant</span>s]</span></span>
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<pre style="margin: 0;"> <span id="LC692" class="line" lang="haskell"><span class="n" style="color: #333;">checkTcLevelInvariant</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcLevel</span> <span class="n" style="color: #333;">ctxt_tclvl</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcLevel</span> <span class="n" style="color: #333;">tv_tclvl</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC693" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctxt_tclvl</span> <span class="o" style="font-weight: 600;">>=</span> <span class="n" style="color: #333;">tv_tclvl</span></span>
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<pre style="margin: 0;"> <span id="LC694" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -998,6 +1001,16 @@ tcIsTcTyVar :: TcTyVar -> Bool</td>
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1001
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<pre style="margin: 0;"> <span id="LC1001" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [TcTyVars and TyVars in the typechecker]</span></span>
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1002
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<pre style="margin: 0;"> <span id="LC1002" class="line" lang="haskell"><span class="n" style="color: #333;">tcIsTcTyVar</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isTyVar</span> <span class="n" style="color: #333;">tv</span></span>
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1003
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<pre style="margin: 0;"> <span id="LC1003" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1004" class="line" lang="haskell"><span class="n" style="color: #333;">isPromotableMetaTyVar</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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1005
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<pre style="margin: 0;">+<span id="LC1005" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- True is this is a meta-tyvar that can be</span></span>
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<pre style="margin: 0;">+<span id="LC1006" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- promoted to an outer level</span></span>
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<pre style="margin: 0;">+<span id="LC1007" class="line" lang="haskell"><span class="n" style="color: #333;">isPromotableMetaTyVar</span> <span class="n" style="color: #333;">tv</span></span>
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<pre style="margin: 0;">+<span id="LC1008" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTyVar</span> <span class="n" style="color: #333;">tv</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Coercion variables in free variable lists]</span></span>
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1009
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<pre style="margin: 0;">+<span id="LC1009" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">MetaTv</span> <span class="p">{</span> <span class="n" style="color: #333;">mtv_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">info</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcTyVarDetails</span> <span class="n" style="color: #333;">tv</span></span>
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1010
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<pre style="margin: 0;">+<span id="LC1010" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isTouchableInfo</span> <span class="n" style="color: #333;">info</span> <span class="c1" style="color: #998; font-style: italic;">-- Can't promote cycle breakers</span></span>
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1011
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<pre style="margin: 0;">+<span id="LC1011" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<pre style="margin: 0;">+<span id="LC1012" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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1013
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<pre style="margin: 0;">+<span id="LC1013" class="line" lang="haskell"></span>
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1001
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1014
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<pre style="margin: 0;"> <span id="LC1014" class="line" lang="haskell"><span class="n" style="color: #333;">isTouchableMetaTyVar</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcLevel</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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1002
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1015
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<pre style="margin: 0;"> <span id="LC1015" class="line" lang="haskell"><span class="n" style="color: #333;">isTouchableMetaTyVar</span> <span class="n" style="color: #333;">ctxt_tclvl</span> <span class="n" style="color: #333;">tv</span></span>
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1003
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1016
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<pre style="margin: 0;"> <span id="LC1016" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTyVar</span> <span class="n" style="color: #333;">tv</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Coercion variables in free variable lists]</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1009,15 +1022,6 @@ isTouchableMetaTyVar ctxt_tclvl tv</td>
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1009
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1022
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<pre style="margin: 0;"> <span id="LC1022" class="line" lang="haskell"></span>
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1023
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<pre style="margin: 0;"> <span id="LC1023" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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1011
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1024
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<pre style="margin: 0;"> <span id="LC1024" class="line" lang="haskell"></span>
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1012
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<pre style="margin: 0;">-<span id="LC1012" class="line" lang="haskell"><span class="n" style="color: #333;">isFloatedTouchableMetaTyVar</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcLevel</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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1013
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<pre style="margin: 0;">-<span id="LC1013" class="line" lang="haskell"><span class="n" style="color: #333;">isFloatedTouchableMetaTyVar</span> <span class="n" style="color: #333;">ctxt_tclvl</span> <span class="n" style="color: #333;">tv</span></span>
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1014
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<pre style="margin: 0;">-<span id="LC1014" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTyVar</span> <span class="n" style="color: #333;">tv</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Coercion variables in free variable lists]</span></span>
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1015
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<pre style="margin: 0;">-<span id="LC1015" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">MetaTv</span> <span class="p">{</span> <span class="n" style="color: #333;">mtv_tclvl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tv_tclvl</span><span class="p">,</span> <span class="n" style="color: #333;">mtv_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">info</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcTyVarDetails</span> <span class="n" style="color: #333;">tv</span></span>
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1016
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<pre style="margin: 0;">-<span id="LC1016" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">isTouchableInfo</span> <span class="n" style="color: #333;">info</span></span>
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1017
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<pre style="margin: 0;">-<span id="LC1017" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tv_tclvl</span> <span class="p">`</span><span class="n" style="color: #333;">strictlyDeeperThan</span><span class="p">`</span> <span class="n" style="color: #333;">ctxt_tclvl</span></span>
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1018
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<pre style="margin: 0;">-<span id="LC1018" class="line" lang="haskell"></span>
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1019
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<pre style="margin: 0;">-<span id="LC1019" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">-<span id="LC1020" class="line" lang="haskell"></span>
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1025
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<pre style="margin: 0;"> <span id="LC1025" class="line" lang="haskell"><span class="n" style="color: #333;">isImmutableTyVar</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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1026
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<pre style="margin: 0;"> <span id="LC1026" class="line" lang="haskell"><span class="n" style="color: #333;">isImmutableTyVar</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isSkolemTyVar</span> <span class="n" style="color: #333;">tv</span></span>
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<pre style="margin: 0;"> <span id="LC1027" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4f85f14177d0b2be1c1489bc69ad4f69372e1fb4#74295edeac870ee7f2f3484ebaffab5c948b735a"><strong>compiler/GHC/Tc/Utils/Unify.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -37,7 +37,7 @@ module GHC.Tc.Utils.Unify (</td>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">matchExpectedFunKind</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">matchActualFunTySigma</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">matchActualFunTysRho</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC40" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left">metaTyVarUpdateOK</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">occCheckForErrors</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">MetaTyVarUpdate</span>Result</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span></span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left">occCheckForErrors</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">CheckTyEq</span>Result</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span></span>
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41
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">checkTyVarEq</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">checkTyFamEq</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">checkTypeEq</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">AreTypeFamiliesOK</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="haskell"> <span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -78,6 +78,7 @@ import GHC.Utils.Panic</td>
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<pre style="margin: 0;"> <span id="LC78" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Exts</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">inline</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC79" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Monad</span></span>
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<pre style="margin: 0;"> <span id="LC80" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Arrow</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">second</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC81" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="k" style="font-weight: 600;">qualified</span> <span class="nn" style="color: #555;">Data.Semigroup</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">S</span></span>
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<pre style="margin: 0;"> <span id="LC82" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC83" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC84" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *********************************************************************</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1169,17 +1170,17 @@ uType t_or_k origin orig_ty1 orig_ty2</td>
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<pre style="margin: 0;"> <span id="LC1170" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- so that type variables tend to get filled in with</span></span>
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1171
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<pre style="margin: 0;"> <span id="LC1171" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the most informative version of the type</span></span>
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<pre style="margin: 0;"> <span id="LC1172" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyVarTy</span> <span class="n" style="color: #333;">tv1</span><span class="p">)</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;">-<span id="LC1172" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">lookup_res</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;"><span class="idiff left right">lookupTcTyVar</span></span> <span class="n" style="color: #333;">tv1</span></span>
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<pre style="margin: 0;">+<span id="LC1173" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">lookup_res</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;"><span class="idiff left right">isFilledMetaTyVar_maybe</span></span> <span class="n" style="color: #333;">tv1</span></span>
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<pre style="margin: 0;"> <span id="LC1174" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lookup_res</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC1174" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Filled</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty1</span></span><span class="idiff right"> </span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"found filled tyvar"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tv1</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">":->"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty1</span><span class="p">)</span></span>
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1175
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<pre style="margin: 0;">-<span id="LC1175" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="p">;</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC1176" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Unfilled</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff right">_</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">uUnfilledVar</span> <span class="n" style="color: #333;">origin</span> <span class="n" style="color: #333;">t_or_k</span> <span class="kt" style="color: #458; font-weight: 600;">NotSwapped</span> <span class="n" style="color: #333;">tv1</span> <span class="n" style="color: #333;">ty2</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1175" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Just</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">ty1</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"found filled tyvar"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tv1</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">":->"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty1</span><span class="p">)</span></span>
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1176
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<pre style="margin: 0;">+<span id="LC1176" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span> <span class="p">}</span></span>
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1177
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<pre style="margin: 0;">+<span id="LC1177" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Nothing</span></span><span class="idiff right"> </span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">uUnfilledVar</span> <span class="n" style="color: #333;">origin</span> <span class="n" style="color: #333;">t_or_k</span> <span class="kt" style="color: #458; font-weight: 600;">NotSwapped</span> <span class="n" style="color: #333;">tv1</span> <span class="n" style="color: #333;">ty2</span> <span class="p">}</span></span>
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1177
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1178
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<pre style="margin: 0;"> <span id="LC1178" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty1</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyVarTy</span> <span class="n" style="color: #333;">tv2</span><span class="p">)</span></span>
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1178
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<pre style="margin: 0;">-<span id="LC1178" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">lookup_res</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;"><span class="idiff left right">lookupTcTyVar</span></span> <span class="n" style="color: #333;">tv2</span></span>
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1179
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<pre style="margin: 0;">+<span id="LC1179" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">lookup_res</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;"><span class="idiff left right">isFilledMetaTyVar_maybe</span></span> <span class="n" style="color: #333;">tv2</span></span>
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1179
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1180
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<pre style="margin: 0;"> <span id="LC1180" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lookup_res</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1180
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<pre style="margin: 0;">-<span id="LC1180" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Filled</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty2</span></span><span class="idiff right"> </span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"found filled tyvar"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tv2</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">":->"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span></span>
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1181
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<pre style="margin: 0;">-<span id="LC1181" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="p">;</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span> <span class="p">}</span></span>
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1182
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<pre style="margin: 0;">-<span id="LC1182" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Unfilled</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff right">_</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">uUnfilledVar</span> <span class="n" style="color: #333;">origin</span> <span class="n" style="color: #333;">t_or_k</span> <span class="kt" style="color: #458; font-weight: 600;">IsSwapped</span> <span class="n" style="color: #333;">tv2</span> <span class="n" style="color: #333;">ty1</span> <span class="p">}</span></span>
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1181
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<pre style="margin: 0;">+<span id="LC1181" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Just</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">ty2</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"found filled tyvar"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tv2</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">":->"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span></span>
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1182
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<pre style="margin: 0;">+<span id="LC1182" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span> <span class="p">}</span></span>
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1183
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<pre style="margin: 0;">+<span id="LC1183" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Nothing</span></span><span class="idiff right"> </span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">uUnfilledVar</span> <span class="n" style="color: #333;">origin</span> <span class="n" style="color: #333;">t_or_k</span> <span class="kt" style="color: #458; font-weight: 600;">IsSwapped</span> <span class="n" style="color: #333;">tv2</span> <span class="n" style="color: #333;">ty1</span> <span class="p">}</span></span>
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1183
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1184
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<pre style="margin: 0;"> <span id="LC1184" class="line" lang="haskell"></span>
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1184
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1185
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<pre style="margin: 0;"> <span id="LC1185" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Expanding synonyms during unification]</span></span>
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1185
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1186
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<pre style="margin: 0;"> <span id="LC1186" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty1</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyConApp</span> <span class="n" style="color: #333;">tc1</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyConApp</span> <span class="n" style="color: #333;">tc2</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1433" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1434" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1433,10 +1434,12 @@ uUnfilledVar2 origin t_or_k swapped tv1 ty2</td>
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1433
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1434
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<pre style="margin: 0;"> <span id="LC1434" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">cur_lvl</span> <span class="p">}</span></span>
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1434
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1435
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<pre style="margin: 0;"> <span id="LC1435" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC1436" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">cur_lvl</span></span>
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<pre style="margin: 0;">-<span id="LC1436" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">canSolveByUnification</span> <span class="n" style="color: #333;">cur_lvl</span> <span class="n" style="color: #333;">tv1</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;">+<span id="LC1437" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTouchableMetaTyVar</span> <span class="n" style="color: #333;">cur_lvl</span> <span class="n" style="color: #333;">tv1</span></span>
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<pre style="margin: 0;">+<span id="LC1438" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Unification preconditions], (UNTOUCHABLE) wrinkles</span></span>
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<pre style="margin: 0;">+<span id="LC1439" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">canSolveByUnification</span> <span class="p">(</span><span class="n" style="color: #333;">metaTyVarInfo</span> <span class="n" style="color: #333;">tv1</span><span class="p">)</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;">+<span id="LC1440" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">CTE_OK</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkTyVarEq</span> <span class="n" style="color: #333;">dflags</span> <span class="kt" style="color: #458; font-weight: 600;">NoTypeFamilies</span> <span class="n" style="color: #333;">tv1</span> <span class="n" style="color: #333;">ty2</span></span>
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1441
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<pre style="margin: 0;"> <span id="LC1441" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Prevent unification with type families] about the NoTypeFamilies:</span></span>
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1438
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<pre style="margin: 0;">-<span id="LC1438" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">MTVU_OK</span> <span class="n" style="color: #333;">ty2'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">metaTyVarUpdateOK</span> <span class="n" style="color: #333;">dflags</span> <span class="kt" style="color: #458; font-weight: 600;">NoTypeFamilies</span> <span class="n" style="color: #333;">tv1</span> <span class="n" style="color: #333;">ty2</span></span>
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1439
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<pre style="margin: 0;">-<span id="LC1439" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">co_k</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">uType</span> <span class="kt" style="color: #458; font-weight: 600;">KindLevel</span> <span class="n" style="color: #333;">kind_origin</span> <span class="p">(</span><span class="n" style="color: #333;">tcTypeKind</span> <span class="n" style="color: #333;">ty2'</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">tyVarKind</span> <span class="n" style="color: #333;">tv1</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1442" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">co_k</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">uType</span> <span class="kt" style="color: #458; font-weight: 600;">KindLevel</span> <span class="n" style="color: #333;">kind_origin</span> <span class="p">(</span><span class="n" style="color: #333;">tcTypeKind</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">tyVarKind</span> <span class="n" style="color: #333;">tv1</span><span class="p">)</span></span>
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1443
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<pre style="margin: 0;"> <span id="LC1443" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"uUnfilledVar2 ok"</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC1444" class="line" lang="haskell"> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tv1</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">tyVarKind</span> <span class="n" style="color: #333;">tv1</span><span class="p">)</span></span>
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1445
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<pre style="margin: 0;"> <span id="LC1445" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty2</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">tcTypeKind</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1446,8 +1449,8 @@ uUnfilledVar2 origin t_or_k swapped tv1 ty2</td>
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1449
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<pre style="margin: 0;"> <span id="LC1449" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Only proceed if the kinds match</span></span>
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1450
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<pre style="margin: 0;"> <span id="LC1450" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: tv1 should still be unfilled, despite the kind unification</span></span>
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1451
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<pre style="margin: 0;"> <span id="LC1451" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- because tv1 is not free in ty2 (or, hence, in its kind)</span></span>
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<pre style="margin: 0;">-<span id="LC1449" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">writeMetaTyVar</span> <span class="n" style="color: #333;">tv1</span> <span class="n" style="color: #333;">ty2<span class="idiff left right">'</span></span></span>
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<pre style="margin: 0;">-<span id="LC1450" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkTcNomReflCo</span> <span class="n" style="color: #333;">ty2<span class="idiff left right">'</span></span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1452" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">writeMetaTyVar</span> <span class="n" style="color: #333;">tv1</span> <span class="n" style="color: #333;">ty2</span></span>
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1453
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<pre style="margin: 0;">+<span id="LC1453" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkTcNomReflCo</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span> <span class="p">}</span></span>
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1451
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1454
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<pre style="margin: 0;"> <span id="LC1454" class="line" lang="haskell"></span>
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1455
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<pre style="margin: 0;"> <span id="LC1455" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">defer</span> <span class="p">}</span> <span class="c1" style="color: #998; font-style: italic;">-- This cannot be solved now. See GHC.Tc.Solver.Canonical</span></span>
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1453
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1456
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<pre style="margin: 0;"> <span id="LC1456" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Equalities with incompatible kinds]</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1464,6 +1467,22 @@ uUnfilledVar2 origin t_or_k swapped tv1 ty2</td>
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1464
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1467
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<pre style="margin: 0;"> <span id="LC1467" class="line" lang="haskell"></span>
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1465
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<pre style="margin: 0;"> <span id="LC1468" class="line" lang="haskell"> <span class="n" style="color: #333;">defer</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unSwap</span> <span class="n" style="color: #333;">swapped</span> <span class="p">(</span><span class="n" style="color: #333;">uType_defer</span> <span class="n" style="color: #333;">t_or_k</span> <span class="n" style="color: #333;">origin</span><span class="p">)</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span></span>
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1466
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1469
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<pre style="margin: 0;"> <span id="LC1469" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1470" class="line" lang="haskell"><span class="n" style="color: #333;">canSolveByUnification</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">MetaInfo</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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1471
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<pre style="margin: 0;">+<span id="LC1471" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Unification preconditions, (TYVAR-TV)]</span></span>
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1472
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<pre style="margin: 0;">+<span id="LC1472" class="line" lang="haskell"><span class="n" style="color: #333;">canSolveByUnification</span> <span class="n" style="color: #333;">info</span> <span class="n" style="color: #333;">xi</span></span>
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<pre style="margin: 0;">+<span id="LC1473" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">info</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1474
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<pre style="margin: 0;">+<span id="LC1474" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CycleBreakerTv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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1475
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<pre style="margin: 0;">+<span id="LC1475" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TyVarTv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">tcGetTyVar_maybe</span> <span class="n" style="color: #333;">xi</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1476
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<pre style="margin: 0;">+<span id="LC1476" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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1477
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<pre style="margin: 0;">+<span id="LC1477" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">tcTyVarDetails</span> <span class="n" style="color: #333;">tv</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1478
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<pre style="margin: 0;">+<span id="LC1478" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MetaTv</span> <span class="p">{</span> <span class="n" style="color: #333;">mtv_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">info</span> <span class="p">}</span></span>
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1479
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<pre style="margin: 0;">+<span id="LC1479" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">info</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1480
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<pre style="margin: 0;">+<span id="LC1480" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TyVarTv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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1481
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<pre style="margin: 0;">+<span id="LC1481" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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1482
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<pre style="margin: 0;">+<span id="LC1482" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SkolemTv</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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1483
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<pre style="margin: 0;">+<span id="LC1483" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">RuntimeUnk</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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1484
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<pre style="margin: 0;">+<span id="LC1484" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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1485
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<pre style="margin: 0;">+<span id="LC1485" class="line" lang="haskell"></span>
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1467
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1486
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<pre style="margin: 0;"> <span id="LC1486" class="line" lang="haskell"><span class="n" style="color: #333;">swapOverTyVars</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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1468
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1487
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<pre style="margin: 0;"> <span id="LC1487" class="line" lang="haskell"><span class="n" style="color: #333;">swapOverTyVars</span> <span class="n" style="color: #333;">is_given</span> <span class="n" style="color: #333;">tv1</span> <span class="n" style="color: #333;">tv2</span></span>
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1469
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1488
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<pre style="margin: 0;"> <span id="LC1488" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Unification variables on the left]</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1507,8 +1526,94 @@ lhsPriority tv</td>
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1507
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1526
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<pre style="margin: 0;"> <span id="LC1526" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TauTv</span> <span class="o" style="font-weight: 600;">-></span> <span class="mi" style="color: #099;">2</span></span>
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<pre style="margin: 0;"> <span id="LC1527" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">RuntimeUnkTv</span> <span class="o" style="font-weight: 600;">-></span> <span class="mi" style="color: #099;">3</span></span>
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1528
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<pre style="margin: 0;"> <span id="LC1528" class="line" lang="haskell"></span>
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1510
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<pre style="margin: 0;">-<span id="LC1510" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [TyVar/TyVar orientation]</span></span>
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1511
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<pre style="margin: 0;">-<span id="LC1511" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">+<span id="LC1529" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Unification preconditions]</span></span>
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<pre style="margin: 0;">+<span id="LC1530" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">+<span id="LC1531" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Question: given a homogeneous equality (alpha ~# ty), when is it OK to</span></span>
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<pre style="margin: 0;">+<span id="LC1532" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">unify alpha := ty?</span></span>
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1533
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<pre style="margin: 0;">+<span id="LC1533" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1534" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This note only applied to /homogeneous/ equalities, in which both</span></span>
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1535
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<pre style="margin: 0;">+<span id="LC1535" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">sides have the same kind.</span></span>
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1536
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<pre style="margin: 0;">+<span id="LC1536" class="line" lang="haskell"></span>
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1537
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<pre style="margin: 0;">+<span id="LC1537" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">There are three reasons not to unify:</span></span>
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1538
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<pre style="margin: 0;">+<span id="LC1538" class="line" lang="haskell"></span>
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1539
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<pre style="margin: 0;">+<span id="LC1539" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">1. (SKOL-ESC) Skolem-escape</span></span>
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<pre style="margin: 0;">+<span id="LC1540" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Consider the constraint</span></span>
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<pre style="margin: 0;">+<span id="LC1541" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> forall[2] a[2]. alpha[1] ~ Maybe a[2]</span></span>
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<pre style="margin: 0;">+<span id="LC1542" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> If we unify alpha := Maybe a, the skolem 'a' may escape its scope.</span></span>
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1543
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<pre style="margin: 0;">+<span id="LC1543" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The level alpha[1] says that alpha may be used outside this constraint,</span></span>
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<pre style="margin: 0;">+<span id="LC1544" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> where 'a' is not in scope at all. So we must not unify.</span></span>
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1545
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<pre style="margin: 0;">+<span id="LC1545" class="line" lang="haskell"></span>
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1546
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<pre style="margin: 0;">+<span id="LC1546" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Bottom line: when looking at a constraint alpha[n] := ty, do not unify</span></span>
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1547
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<pre style="margin: 0;">+<span id="LC1547" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> if any free variable of 'ty' has level deeper (greater) than n</span></span>
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1548
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<pre style="margin: 0;">+<span id="LC1548" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1549" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">2. (UNTOUCHABLE) Untouchable unification variables</span></span>
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<pre style="margin: 0;">+<span id="LC1550" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Consider the constraint</span></span>
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<pre style="margin: 0;">+<span id="LC1551" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> forall[2] a[2]. b[1] ~ Int => alpha[1] ~ Int</span></span>
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<pre style="margin: 0;">+<span id="LC1552" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> There is no (SKOL-ESC) problem with unifying alpha := Int, but it might</span></span>
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<pre style="margin: 0;">+<span id="LC1553" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> not be the principal solution. Perhaps the "right" solution is alpha := b.</span></span>
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<pre style="margin: 0;">+<span id="LC1554" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We simply can't tell. See "OutsideIn(X): modular type inference with local</span></span>
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<pre style="margin: 0;">+<span id="LC1555" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> assumptions", section 2.2. We say that alpha[1] is "untouchable" inside</span></span>
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<pre style="margin: 0;">+<span id="LC1556" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> this implication.</span></span>
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<pre style="margin: 0;">+<span id="LC1557" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1558" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Bottom line: at amibient level 'l', when looking at a constraint</span></span>
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<pre style="margin: 0;">+<span id="LC1559" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> alpha[n] ~ ty, do not unify alpha := ty if there are any given equalities</span></span>
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<pre style="margin: 0;">+<span id="LC1560" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> between levels 'n' and 'l'.</span></span>
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1561
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<pre style="margin: 0;">+<span id="LC1561" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1562" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Exactly what is a "given equality" for the purpose of (UNTOUCHABLE)?</span></span>
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<pre style="margin: 0;">+<span id="LC1563" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Answer: see Note [Tracking Given equalities] in GHC.Tc.Solver.Monad</span></span>
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<pre style="margin: 0;">+<span id="LC1564" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1565" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">3. (TYVAR-TV) Unifying TyVarTvs and CycleBreakerTvs</span></span>
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<pre style="margin: 0;">+<span id="LC1566" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> This precondition looks at the MetaInfo of the unification variable:</span></span>
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<pre style="margin: 0;">+<span id="LC1567" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1568" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * TyVarTv: When considering alpha{tyv} ~ ty, if alpha{tyv} is a</span></span>
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<pre style="margin: 0;">+<span id="LC1569" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> TyVarTv it can only unify with a type variable, not with a</span></span>
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<pre style="margin: 0;">+<span id="LC1570" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> structured type. So if 'ty' is a structured type, such as (Maybe x),</span></span>
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1571
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<pre style="margin: 0;">+<span id="LC1571" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> don't unify.</span></span>
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1572
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<pre style="margin: 0;">+<span id="LC1572" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1573" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * CycleBreakerTv: never unified, except by restoreTyVarCycles.</span></span>
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1574
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<pre style="margin: 0;">+<span id="LC1574" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1575" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1576" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Needless to say, all three have wrinkles:</span></span>
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<pre style="margin: 0;">+<span id="LC1577" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1578" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* (SKOL-ESC) Promotion. Given alpha[n] ~ ty, what if beta[k] is free</span></span>
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<pre style="margin: 0;">+<span id="LC1579" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in 'ty', where beta is a unification variable, and k>n? 'beta'</span></span>
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<pre style="margin: 0;">+<span id="LC1580" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> stands for a monotype, and since it is part of a level-n type</span></span>
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<pre style="margin: 0;">+<span id="LC1581" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (equal to alpha[n]), we must /promote/ beta to level n. Just make</span></span>
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<pre style="margin: 0;">+<span id="LC1582" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> up a fresh gamma[n], and unify beta[k] := gamma[n].</span></span>
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<pre style="margin: 0;">+<span id="LC1584" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* (TYVAR-TV) Unification variables. Suppose alpha[tyv,n] is a level-n</span></span>
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<pre style="margin: 0;">+<span id="LC1585" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> TyVarTv (see Note [Signature skolems] in GHC.Tc.Types.TcType)? Now</span></span>
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<pre style="margin: 0;">+<span id="LC1586" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> consider alpha[tyv,n] ~ Bool. We don't want to unify because that</span></span>
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<pre style="margin: 0;">+<span id="LC1587" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> would break the TyVarTv invariant.</span></span>
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<pre style="margin: 0;">+<span id="LC1588" class="line" lang="haskell"></span>
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1589
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<pre style="margin: 0;">+<span id="LC1589" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> What about alpha[tyv,n] ~ beta[tau,n], where beta is an ordinary</span></span>
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1590
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<pre style="margin: 0;">+<span id="LC1590" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> TauTv? Again, don't unify, because beta might later be unified</span></span>
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1591
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<pre style="margin: 0;">+<span id="LC1591" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> with, say Bool. (If levels permit, we reverse the orientation here;</span></span>
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1592
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<pre style="margin: 0;">+<span id="LC1592" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> see Note [TyVar/TyVar orientation].)</span></span>
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1593
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<pre style="margin: 0;">+<span id="LC1593" class="line" lang="haskell"></span>
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1594
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<pre style="margin: 0;">+<span id="LC1594" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* (UNTOUCHABLE) Untouchability. When considering (alpha[n] ~ ty), how</span></span>
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1595
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<pre style="margin: 0;">+<span id="LC1595" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> do we know whether there are any given equalities between level n</span></span>
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1596
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<pre style="margin: 0;">+<span id="LC1596" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> and the ambient level? We answer in two ways:</span></span>
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1597
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<pre style="margin: 0;">+<span id="LC1597" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1598" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * In the eager unifier, we only unify if l=n. If not, alpha may be</span></span>
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1599
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<pre style="margin: 0;">+<span id="LC1599" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> untouchable, and defer to the constraint solver. This check is</span></span>
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1600
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<pre style="margin: 0;">+<span id="LC1600" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> made in GHC.Tc.Utils.uUnifilledVar2, in the guard</span></span>
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1601
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<pre style="margin: 0;">+<span id="LC1601" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> isTouchableMetaTyVar.</span></span>
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1602
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<pre style="margin: 0;">+<span id="LC1602" class="line" lang="haskell"></span>
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1603
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<pre style="margin: 0;">+<span id="LC1603" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * In the constraint solver, we track where Given equalities occur</span></span>
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1604
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<pre style="margin: 0;">+<span id="LC1604" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> and use that to guard unification in GHC.Tc.Solver.Canonical.unifyTest</span></span>
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<pre style="margin: 0;">+<span id="LC1605" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> More details in Note [Tracking Given equalities] in GHC.Tc.Solver.Monad</span></span>
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1606
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<pre style="margin: 0;">+<span id="LC1606" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1607" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Historical note: in the olden days (pre 2021) the constraint solver</span></span>
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1608
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<pre style="margin: 0;">+<span id="LC1608" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> also used to unify only if l=n. Equalities were "floated" out of the</span></span>
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1609
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<pre style="margin: 0;">+<span id="LC1609" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> implication in a separate step, so that they would become touchable.</span></span>
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1610
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<pre style="margin: 0;">+<span id="LC1610" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> But the float/don't-float question turned out to be very delicate,</span></span>
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1611
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<pre style="margin: 0;">+<span id="LC1611" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> as you can see if you look at the long series of Notes associated with</span></span>
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1612
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<pre style="margin: 0;">+<span id="LC1612" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> GHC.Tc.Solver.floatEqualities, around Nov 2020. It's much easier</span></span>
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<pre style="margin: 0;">+<span id="LC1613" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> to unify in-place, with no floating.</span></span>
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1614
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<pre style="margin: 0;">+<span id="LC1614" class="line" lang="haskell"></span>
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1615
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<pre style="margin: 0;">+<span id="LC1615" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [TyVar/TyVar orientation]</span></span>
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1616
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<pre style="margin: 0;">+<span id="LC1616" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1512
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1617
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<pre style="margin: 0;"> <span id="LC1617" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Given (a ~ b), should we orient the CEqCan as (a~b) or (b~a)?</span></span>
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1513
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1618
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<pre style="margin: 0;"> <span id="LC1618" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This is a surprisingly tricky question! This is invariant (TyEq:TV).</span></span>
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1514
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1619
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<pre style="margin: 0;"> <span id="LC1619" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1616,8 +1721,8 @@ inert guy, so we get</td>
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1616
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1721
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<pre style="margin: 0;"> <span id="LC1721" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> inert item: c ~ a</span></span>
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1617
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1722
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<pre style="margin: 0;"> <span id="LC1722" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">And now the cycle just repeats</span></span>
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1618
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1723
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<pre style="margin: 0;"> <span id="LC1723" class="line" lang="haskell"></span>
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1619
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<pre style="margin: 0;">-<span id="LC1619" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Eliminate younger unification variables]</span></span>
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1620
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<pre style="margin: 0;">-<span id="LC1620" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1724
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<pre style="margin: 0;">+<span id="LC1724" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">Historical </span>Note [Eliminate younger unification variables]</span></span>
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1725
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<pre style="margin: 0;">+<span id="LC1725" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<span class="idiff left right">~~~~~~~~~~~</span></span></span>
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1621
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1726
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<pre style="margin: 0;"> <span id="LC1726" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Given a choice of unifying</span></span>
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1622
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1727
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<pre style="margin: 0;"> <span id="LC1727" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> alpha := beta or beta := alpha</span></span>
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1623
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1728
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<pre style="margin: 0;"> <span id="LC1728" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we try, if possible, to eliminate the "younger" one, as determined</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1631" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1631,36 +1736,11 @@ This is a performance optimisation only. It turns out to fix</td>
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1631
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1736
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<pre style="margin: 0;"> <span id="LC1736" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">It's simple to implement (see nicer_to_update_tv2 in swapOverTyVars).</span></span>
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1632
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1737
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<pre style="margin: 0;"> <span id="LC1737" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But, to my surprise, it didn't seem to make any significant difference</span></span>
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1633
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1738
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<pre style="margin: 0;"> <span id="LC1738" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to the compiler's performance, so I didn't take it any further. Still</span></span>
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1634
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<pre style="margin: 0;">-<span id="LC1634" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">it seemed to<span class="idiff left right"> to</span>o nice to discard altogether, so I'm leaving these</span></span>
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1739
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<pre style="margin: 0;">+<span id="LC1739" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">it seemed too nice to discard altogether, so I'm leaving these</span></span>
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1635
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1740
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<pre style="margin: 0;"> <span id="LC1740" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">notes. SLPJ Jan 18.</span></span>
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<pre style="margin: 0;">-<span id="LC1636" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1637
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1741
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<pre style="margin: 0;"> <span id="LC1741" class="line" lang="haskell"></span>
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1638
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<pre style="margin: 0;">-<span id="LC1638" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @trySpontaneousSolve wi@ solves equalities where one side is a</span></span>
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1639
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<pre style="margin: 0;">-<span id="LC1639" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- touchable unification variable.</span></span>
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1640
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<pre style="margin: 0;">-<span id="LC1640" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returns True <=> spontaneous solve happened</span></span>
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1641
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<pre style="margin: 0;">-<span id="LC1641" class="line" lang="haskell"><span class="n" style="color: #333;">canSolveByUnification</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcLevel</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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1642
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<pre style="margin: 0;">-<span id="LC1642" class="line" lang="haskell"><span class="n" style="color: #333;">canSolveByUnification</span> <span class="n" style="color: #333;">tclvl</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">xi</span></span>
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1643
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<pre style="margin: 0;">-<span id="LC1643" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTouchableMetaTyVar</span> <span class="n" style="color: #333;">tclvl</span> <span class="n" style="color: #333;">tv</span></span>
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1644
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<pre style="margin: 0;">-<span id="LC1644" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">metaTyVarInfo</span> <span class="n" style="color: #333;">tv</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1645
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<pre style="margin: 0;">-<span id="LC1645" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TyVarTv</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">is_tyvar</span> <span class="n" style="color: #333;">xi</span></span>
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1646
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<pre style="margin: 0;">-<span id="LC1646" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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1647
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<pre style="margin: 0;">-<span id="LC1647" class="line" lang="haskell"></span>
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1648
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<pre style="margin: 0;">-<span id="LC1648" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="c1" style="color: #998; font-style: italic;">-- Untouchable</span></span>
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1649
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<pre style="margin: 0;">-<span id="LC1649" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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1650
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<pre style="margin: 0;">-<span id="LC1650" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1651
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<pre style="margin: 0;">-<span id="LC1651" class="line" lang="haskell"> <span class="n" style="color: #333;">is_tyvar</span> <span class="n" style="color: #333;">xi</span></span>
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1652
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<pre style="margin: 0;">-<span id="LC1652" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">tcGetTyVar_maybe</span> <span class="n" style="color: #333;">xi</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1653
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<pre style="margin: 0;">-<span id="LC1653" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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1654
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<pre style="margin: 0;">-<span id="LC1654" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">tcTyVarDetails</span> <span class="n" style="color: #333;">tv</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1655
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<pre style="margin: 0;">-<span id="LC1655" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MetaTv</span> <span class="p">{</span> <span class="n" style="color: #333;">mtv_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">info</span> <span class="p">}</span></span>
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1656
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<pre style="margin: 0;">-<span id="LC1656" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">info</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1657
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<pre style="margin: 0;">-<span id="LC1657" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TyVarTv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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1658
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<pre style="margin: 0;">-<span id="LC1658" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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1659
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<pre style="margin: 0;">-<span id="LC1659" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SkolemTv</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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1660
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<pre style="margin: 0;">-<span id="LC1660" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">RuntimeUnk</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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1661
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<pre style="margin: 0;">-<span id="LC1661" class="line" lang="haskell"></span>
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1662
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<pre style="margin: 0;">-<span id="LC1662" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Prevent unification with type families]</span></span>
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1663
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<pre style="margin: 0;">-<span id="LC1663" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1742
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<pre style="margin: 0;">+<span id="LC1742" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Prevent unification with type families]</span></span>
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1743
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<pre style="margin: 0;">+<span id="LC1743" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;"> <span id="LC1744" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We prevent unification with type families because of an uneasy compromise.</span></span>
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<pre style="margin: 0;"> <span id="LC1745" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">It's perfectly sound to unify with type families, and it even improves the</span></span>
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1746
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<pre style="margin: 0;"> <span id="LC1746" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">error messages in the testsuite. It also modestly improves performance, at</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1764,35 +1844,6 @@ type-checking (with wrappers, etc.). Types get desugared very differently,</td>
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<pre style="margin: 0;"> <span id="LC1844" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">causing this wibble in behavior seen here.</span></span>
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<pre style="margin: 0;"> <span id="LC1845" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1766
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1846
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<pre style="margin: 0;"> <span id="LC1846" class="line" lang="haskell"></span>
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1767
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<pre style="margin: 0;">-<span id="LC1767" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">LookupTyVarResult</span> <span class="c1" style="color: #998; font-style: italic;">-- The result of a lookupTcTyVar call</span></span>
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1768
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<pre style="margin: 0;">-<span id="LC1768" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Unfilled</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVarDetails</span> <span class="c1" style="color: #998; font-style: italic;">-- SkolemTv or virgin MetaTv</span></span>
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1769
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<pre style="margin: 0;">-<span id="LC1769" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Filled</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span></span>
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1770
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<pre style="margin: 0;">-<span id="LC1770" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1771" class="line" lang="haskell"><span class="n" style="color: #333;">lookupTcTyVar</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">LookupTyVarResult</span></span>
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1772
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<pre style="margin: 0;">-<span id="LC1772" class="line" lang="haskell"><span class="n" style="color: #333;">lookupTcTyVar</span> <span class="n" style="color: #333;">tyvar</span></span>
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1773
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<pre style="margin: 0;">-<span id="LC1773" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">MetaTv</span> <span class="p">{</span> <span class="n" style="color: #333;">mtv_ref</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ref</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">details</span></span>
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1774
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<pre style="margin: 0;">-<span id="LC1774" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">meta_details</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">readMutVar</span> <span class="n" style="color: #333;">ref</span></span>
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<pre style="margin: 0;">-<span id="LC1775" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">meta_details</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1776
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<pre style="margin: 0;">-<span id="LC1776" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Indirect</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Filled</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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1777
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<pre style="margin: 0;">-<span id="LC1777" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Flexi</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">is_touchable</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">isTouchableTcM</span> <span class="n" style="color: #333;">tyvar</span></span>
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1778
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<pre style="margin: 0;">-<span id="LC1778" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Unifying untouchables]</span></span>
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1779
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<pre style="margin: 0;">-<span id="LC1779" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">is_touchable</span> <span class="kr" style="font-weight: 600;">then</span></span>
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1780
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<pre style="margin: 0;">-<span id="LC1780" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Unfilled</span> <span class="n" style="color: #333;">details</span><span class="p">)</span></span>
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1781
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<pre style="margin: 0;">-<span id="LC1781" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span></span>
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1782
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<pre style="margin: 0;">-<span id="LC1782" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Unfilled</span> <span class="n" style="color: #333;">vanillaSkolemTv</span><span class="p">)</span> <span class="p">}</span> <span class="p">}</span></span>
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1783
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<pre style="margin: 0;">-<span id="LC1783" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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1784
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<pre style="margin: 0;">-<span id="LC1784" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Unfilled</span> <span class="n" style="color: #333;">details</span><span class="p">)</span></span>
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1785
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<pre style="margin: 0;">-<span id="LC1785" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1786
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<pre style="margin: 0;">-<span id="LC1786" class="line" lang="haskell"> <span class="n" style="color: #333;">details</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcTyVarDetails</span> <span class="n" style="color: #333;">tyvar</span></span>
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1787
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<pre style="margin: 0;">-<span id="LC1787" class="line" lang="haskell"></span>
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1788
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<pre style="margin: 0;">-<span id="LC1788" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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1789
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<pre style="margin: 0;">-<span id="LC1789" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Unifying untouchables]</span></span>
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1790
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<pre style="margin: 0;">-<span id="LC1790" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1791
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<pre style="margin: 0;">-<span id="LC1791" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We treat an untouchable type variable as if it was a skolem. That</span></span>
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1792
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<pre style="margin: 0;">-<span id="LC1792" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">ensures it won't unify with anything. It's a slight hack, because</span></span>
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1793
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<pre style="margin: 0;">-<span id="LC1793" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we return a made-up TcTyVarDetails, but I think it works smoothly.</span></span>
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1794
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<pre style="margin: 0;">-<span id="LC1794" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1795
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<pre style="margin: 0;">-<span id="LC1795" class="line" lang="haskell"></span>
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1796
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1847
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<pre style="margin: 0;"> <span id="LC1847" class="line" lang="haskell"><span class="cd">-- | Breaks apart a function kind into its pieces.</span></span>
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1797
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1848
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<pre style="margin: 0;"> <span id="LC1848" class="line" lang="haskell"><span class="n" style="color: #333;">matchExpectedFunKind</span></span>
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<pre style="margin: 0;"> <span id="LC1849" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="n" style="color: #333;">fun</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1871,44 +1922,38 @@ with (forall k. k->*)</td>
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1922
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<pre style="margin: 0;"> <span id="LC1922" class="line" lang="haskell"></span>
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1872
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1923
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<pre style="margin: 0;"> <span id="LC1923" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1873
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1924
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<pre style="margin: 0;"> <span id="LC1924" class="line" lang="haskell"></span>
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1874
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<pre style="margin: 0;">-<span id="LC1874" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">MetaTyVarUpdateResult</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">a</span></span></span>
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1875
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<pre style="margin: 0;">-<span id="LC1875" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">MTVU_OK</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">a</span></span></span>
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1876
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<pre style="margin: 0;">-<span id="LC1876" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">MTVU</span>_Bad</span> <span class="c1" style="color: #998; font-style: italic;">-- Forall, predicate, or type family</span></span>
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1877
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<pre style="margin: 0;">-<span id="LC1877" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">MTVU</span>_HoleBlocker</span> <span class="c1" style="color: #998; font-style: italic;">-- Blocking coercion hole</span></span>
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1925
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<pre style="margin: 0;">+<span id="LC1925" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CheckTyEqResult</span></span></span>
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1926
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<pre style="margin: 0;">+<span id="LC1926" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CTE_OK</span></span></span>
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1927
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<pre style="margin: 0;">+<span id="LC1927" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CTE</span>_Bad</span> <span class="c1" style="color: #998; font-style: italic;">-- Forall, predicate, or type family</span></span>
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<pre style="margin: 0;">+<span id="LC1928" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CTE</span>_HoleBlocker</span> <span class="c1" style="color: #998; font-style: italic;">-- Blocking coercion hole</span></span>
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1878
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<pre style="margin: 0;"> <span id="LC1929" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Equalities with incompatible kinds] in "GHC.Tc.Solver.Canonical"</span></span>
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1879
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<pre style="margin: 0;">-<span id="LC1879" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">MTVU_Occurs</span></span>
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1880
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<pre style="margin: 0;">-<span id="LC1880" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Functor</span><span class="p">)</span></span>
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1881
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<pre style="margin: 0;">-<span id="LC1881" class="line" lang="haskell"></span>
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1882
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<pre style="margin: 0;">-<span id="LC1882" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Applicative</span> <span class="kt" style="color: #458; font-weight: 600;">MetaTyVarUpdateResult</span> <span class="kr" style="font-weight: 600;">where</span></span>
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1883
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<pre style="margin: 0;">-<span id="LC1883" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MTVU_OK</span></span>
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1884
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<pre style="margin: 0;">-<span id="LC1884" class="line" lang="haskell"> <span class="p">(</span><span class="o" style="font-weight: 600;"><*></span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ap</span></span>
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1885
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<pre style="margin: 0;">-<span id="LC1885" class="line" lang="haskell"></span>
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1886
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<pre style="margin: 0;">-<span id="LC1886" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Monad</span> <span class="kt" style="color: #458; font-weight: 600;">MetaTyVarUpdateResult</span> <span class="kr" style="font-weight: 600;">where</span></span>
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1887
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<pre style="margin: 0;">-<span id="LC1887" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MTVU_OK</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">k</span> <span class="n" style="color: #333;">x</span></span>
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1888
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<pre style="margin: 0;">-<span id="LC1888" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MTVU_Bad</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MTVU_Bad</span></span>
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1889
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<pre style="margin: 0;">-<span id="LC1889" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MTVU_HoleBlocker</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MTVU_HoleBlocker</span></span>
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1890
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<pre style="margin: 0;">-<span id="LC1890" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MTVU_Occurs</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MTVU_Occurs</span></span>
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1891
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<pre style="margin: 0;">-<span id="LC1891" class="line" lang="haskell"></span>
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1892
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<pre style="margin: 0;">-<span id="LC1892" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MetaTyVarUpdateResult</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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1893
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<pre style="margin: 0;">-<span id="LC1893" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MTVU_OK</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"MTVU_OK"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">a</span></span>
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1894
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<pre style="margin: 0;">-<span id="LC1894" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">MTVU_Bad</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"MTVU_Bad"</span></span>
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1895
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<pre style="margin: 0;">-<span id="LC1895" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">MTVU_HoleBlocker</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"MTVU_HoleBlocker"</span></span>
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1896
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<pre style="margin: 0;">-<span id="LC1896" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">MTVU_Occurs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"MTVU_Occurs"</span></span>
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1897
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<pre style="margin: 0;">-<span id="LC1897" class="line" lang="haskell"></span>
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1898
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<pre style="margin: 0;">-<span id="LC1898" class="line" lang="haskell"><span class="n" style="color: #333;">occCheckForErrors</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MetaTyVarUpdateResult</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1899
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<pre style="margin: 0;">-<span id="LC1899" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Just for error-message generation; so we return MetaTyVarUpdateResult</span></span>
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1930
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<pre style="margin: 0;">+<span id="LC1930" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">CTE_Occurs</span></span>
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1931
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<pre style="margin: 0;">+<span id="LC1931" class="line" lang="haskell"></span>
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1932
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<pre style="margin: 0;">+<span id="LC1932" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">S</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Semigroup</span> <span class="kt" style="color: #458; font-weight: 600;">CheckTyEqResult</span> <span class="kr" style="font-weight: 600;">where</span></span>
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1933
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<pre style="margin: 0;">+<span id="LC1933" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CTE_OK</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">x</span></span>
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1934
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<pre style="margin: 0;">+<span id="LC1934" class="line" lang="haskell"> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;"><></span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">x</span></span>
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1935
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<pre style="margin: 0;">+<span id="LC1935" class="line" lang="haskell"></span>
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1936
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<pre style="margin: 0;">+<span id="LC1936" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Monoid</span> <span class="kt" style="color: #458; font-weight: 600;">CheckTyEqResult</span> <span class="kr" style="font-weight: 600;">where</span></span>
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1937
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<pre style="margin: 0;">+<span id="LC1937" class="line" lang="haskell"> <span class="n" style="color: #333;">mempty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CTE_OK</span></span>
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1938
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<pre style="margin: 0;">+<span id="LC1938" class="line" lang="haskell"></span>
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1939
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<pre style="margin: 0;">+<span id="LC1939" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">CheckTyEqResult</span> <span class="kr" style="font-weight: 600;">where</span></span>
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1940
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<pre style="margin: 0;">+<span id="LC1940" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">CTE_OK</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"CTE_OK"</span></span>
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1941
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<pre style="margin: 0;">+<span id="LC1941" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">CTE_Bad</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"CTE_Bad"</span></span>
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1942
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<pre style="margin: 0;">+<span id="LC1942" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">CTE_HoleBlocker</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"CTE_HoleBlocker"</span></span>
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1943
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<pre style="margin: 0;">+<span id="LC1943" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">CTE_Occurs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"CTE_Occurs"</span></span>
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1944
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<pre style="margin: 0;">+<span id="LC1944" class="line" lang="haskell"></span>
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1945
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<pre style="margin: 0;">+<span id="LC1945" class="line" lang="haskell"><span class="n" style="color: #333;">occCheckForErrors</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CheckTyEqResult</span></span>
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1946
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<pre style="margin: 0;">+<span id="LC1946" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Just for error-message generation; so we return CheckTyEqResult</span></span>
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1900
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1947
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<pre style="margin: 0;"> <span id="LC1947" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- so the caller can report the right kind of error</span></span>
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1901
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1948
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<pre style="margin: 0;"> <span id="LC1948" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Check whether</span></span>
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1902
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1949
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<pre style="margin: 0;"> <span id="LC1949" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- a) the given variable occurs in the given type.</span></span>
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1903
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1950
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<pre style="margin: 0;"> <span id="LC1950" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- b) there is a forall in the type (unless we have -XImpredicativeTypes)</span></span>
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1904
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1951
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<pre style="margin: 0;"> <span id="LC1951" class="line" lang="haskell"><span class="n" style="color: #333;">occCheckForErrors</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">ty</span></span>
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1905
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1952
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<pre style="margin: 0;"> <span id="LC1952" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">checkTyVarEq</span> <span class="n" style="color: #333;">dflags</span> <span class="kt" style="color: #458; font-weight: 600;">YesTypeFamilies</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">ty</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1906
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<pre style="margin: 0;">-<span id="LC1906" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MTVU_OK</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MTVU_OK</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1907
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<pre style="margin: 0;">-<span id="LC1907" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MTVU_Bad</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MTVU_Bad</span></span>
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1908
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<pre style="margin: 0;">-<span id="LC1908" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MTVU_HoleBlocker</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MTVU_HoleBlocker</span></span>
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1909
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<pre style="margin: 0;">-<span id="LC1909" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MTVU_Occurs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">occCheckExpand</span> <span class="p">[</span><span class="n" style="color: #333;">tv</span><span class="p">]</span> <span class="n" style="color: #333;">ty</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1910
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<pre style="margin: 0;">-<span id="LC1910" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MTVU_Occurs</span></span>
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1911
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<pre style="margin: 0;">-<span id="LC1911" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MTVU_OK</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1953
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<pre style="margin: 0;">+<span id="LC1953" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CTE_Occurs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">occCheckExpand</span> <span class="p">[</span><span class="n" style="color: #333;">tv</span><span class="p">]</span> <span class="n" style="color: #333;">ty</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1954
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<pre style="margin: 0;">+<span id="LC1954" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CTE_Occurs</span></span>
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1955
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<pre style="margin: 0;">+<span id="LC1955" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CTE_OK</span></span>
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1956
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<pre style="margin: 0;">+<span id="LC1956" class="line" lang="haskell"> <span class="n" style="color: #333;">other</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">other</span></span>
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1912
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1957
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<pre style="margin: 0;"> <span id="LC1957" class="line" lang="haskell"></span>
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1913
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1958
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<pre style="margin: 0;"> <span id="LC1958" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">----------------</span></span>
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1914
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1959
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<pre style="margin: 0;"> <span id="LC1959" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">AreTypeFamiliesOK</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">YesTypeFamilies</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1964" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1919,52 +1964,7 @@ instance Outputable AreTypeFamiliesOK where</td>
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1919
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1964
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<pre style="margin: 0;"> <span id="LC1964" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">YesTypeFamilies</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"YesTypeFamilies"</span></span>
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1920
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1965
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<pre style="margin: 0;"> <span id="LC1965" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">NoTypeFamilies</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"NoTypeFamilies"</span></span>
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1921
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1966
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<pre style="margin: 0;"> <span id="LC1966" class="line" lang="haskell"></span>
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1922
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<pre style="margin: 0;">-<span id="LC1922" class="line" lang="haskell"><span class="n" style="color: #333;">metaTyVarUpdateOK</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span></span>
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1923
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<pre style="margin: 0;">-<span id="LC1923" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">AreTypeFamiliesOK</span> <span class="c1" style="color: #998; font-style: italic;">-- allow type families in RHS?</span></span>
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1924
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<pre style="margin: 0;">-<span id="LC1924" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span> <span class="c1" style="color: #998; font-style: italic;">-- tv :: k1</span></span>
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1925
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<pre style="margin: 0;">-<span id="LC1925" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="c1" style="color: #998; font-style: italic;">-- ty :: k2</span></span>
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1926
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<pre style="margin: 0;">-<span id="LC1926" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MetaTyVarUpdateResult</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="c1" style="color: #998; font-style: italic;">-- possibly-expanded ty</span></span>
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1927
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<pre style="margin: 0;">-<span id="LC1927" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (metaTyVarUpdateOK tv ty)</span></span>
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1928
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<pre style="margin: 0;">-<span id="LC1928" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Checks that the equality tv~ty is OK to be used to rewrite</span></span>
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1929
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<pre style="margin: 0;">-<span id="LC1929" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- other equalities. Equivalently, checks the conditions for CEqCan</span></span>
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1930
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<pre style="margin: 0;">-<span id="LC1930" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (a) that tv doesn't occur in ty (occurs check)</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1931" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1931
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<pre style="margin: 0;">-<span id="LC1931" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (b) that ty does not have any foralls or (perhaps) type functions</span></span>
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1932
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<pre style="margin: 0;">-<span id="LC1932" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (c) that ty does not have any blocking coercion holes</span></span>
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1933
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<pre style="margin: 0;">-<span id="LC1933" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Equalities with incompatible kinds] in "GHC.Tc.Solver.Canonical"</span></span>
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1934
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<pre style="margin: 0;">-<span id="LC1934" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1935
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<td class="diff-line-num new_line old" data-linenumber="1967" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1935" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Used in two places:</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1936" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1936
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<td class="diff-line-num new_line old" data-linenumber="1967" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1936" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- - In the eager unifier: uUnfilledVar2</span></span>
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1937
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<td class="diff-line-num new_line old" data-linenumber="1967" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1937" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- - In the canonicaliser: GHC.Tc.Solver.Canonical.canEqTyVar2</span></span>
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1938
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<td class="diff-line-num new_line old" data-linenumber="1967" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1938" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note that in the latter case tv is not necessarily a meta-tyvar,</span></span>
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1939
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<td class="diff-line-num new_line old" data-linenumber="1967" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1939" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- despite the name of this function.</span></span>
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1940
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<td class="diff-line-num new_line old" data-linenumber="1967" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1940" class="line" lang="haskell"></span>
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<td class="diff-line-num old old_line" data-linenumber="1941" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1941
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<td class="diff-line-num new_line old" data-linenumber="1967" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1941" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We have two possible outcomes:</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1942" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1942
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<td class="diff-line-num new_line old" data-linenumber="1967" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1942" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (1) Return the type to update the type variable with,</span></span>
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1943
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<td class="diff-line-num new_line old" data-linenumber="1967" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1943" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- [we know the update is ok]</span></span>
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1944
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<td class="diff-line-num new_line old" data-linenumber="1967" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1944" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (2) Return Nothing,</span></span>
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1945
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<td class="diff-line-num new_line old" data-linenumber="1967" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1945" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- [the update might be dodgy]</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1946" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1946
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<pre style="margin: 0;">-<span id="LC1946" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1947
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<td class="diff-line-num new_line old" data-linenumber="1967" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1947" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note that "Nothing" does not mean "definite error". For example</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1948" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1948
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<td class="diff-line-num new_line old" data-linenumber="1967" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1948" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- type family F a</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1949" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1949
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<td class="diff-line-num new_line old" data-linenumber="1967" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1949" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- type instance F Int = Int</span></span>
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1950
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<td class="diff-line-num new_line old" data-linenumber="1967" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1950" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- consider</span></span>
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1951
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<td class="diff-line-num new_line old" data-linenumber="1967" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1951" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- a ~ F a</span></span>
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1952
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<td class="diff-line-num new_line old" data-linenumber="1967" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1952" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This is perfectly reasonable, if we later get a ~ Int. For now, though,</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1953" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1953
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<td class="diff-line-num new_line old" data-linenumber="1967" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1953" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- we return Nothing, leaving it to the later constraint simplifier to</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1954" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1954
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<td class="diff-line-num new_line old" data-linenumber="1967" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1954" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- sort matters out.</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1955" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1955
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<pre style="margin: 0;">-<span id="LC1955" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1956" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1956
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<td class="diff-line-num new_line old" data-linenumber="1967" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1956" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Refactoring hazard: metaTyVarUpdateOK]</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1957" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1957
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<pre style="margin: 0;">-<span id="LC1957" class="line" lang="haskell"></span>
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<td class="diff-line-num old old_line" data-linenumber="1958" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1958
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<pre style="margin: 0;">-<span id="LC1958" class="line" lang="haskell"><span class="n" style="color: #333;">metaTyVarUpdateOK</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">ty_fam_ok</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">ty</span></span>
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1959
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<pre style="margin: 0;">-<span id="LC1959" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">checkTyVarEq</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">ty_fam_ok</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">ty</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1960
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<pre style="margin: 0;">-<span id="LC1960" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MTVU_OK</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MTVU_OK</span> <span class="n" style="color: #333;">ty</span></span>
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1961
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<pre style="margin: 0;">-<span id="LC1961" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MTVU_Bad</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MTVU_Bad</span> <span class="c1" style="color: #998; font-style: italic;">-- forall, predicate, type function</span></span>
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1962
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<pre style="margin: 0;">-<span id="LC1962" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MTVU_HoleBlocker</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MTVU_HoleBlocker</span> <span class="c1" style="color: #998; font-style: italic;">-- coercion hole</span></span>
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1963
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<pre style="margin: 0;">-<span id="LC1963" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MTVU_Occurs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">occCheckExpand</span> <span class="p">[</span><span class="n" style="color: #333;">tv</span><span class="p">]</span> <span class="n" style="color: #333;">ty</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1964
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<pre style="margin: 0;">-<span id="LC1964" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">expanded_ty</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MTVU_OK</span> <span class="n" style="color: #333;">expanded_ty</span></span>
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1965
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<pre style="margin: 0;">-<span id="LC1965" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MTVU_Occurs</span></span>
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1966
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<pre style="margin: 0;">-<span id="LC1966" class="line" lang="haskell"></span>
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1967
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<pre style="margin: 0;">-<span id="LC1967" class="line" lang="haskell"><span class="n" style="color: #333;">checkTyVarEq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">AreTypeFamiliesOK</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MetaTyVarUpdateResult</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1967
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<pre style="margin: 0;">+<span id="LC1967" class="line" lang="haskell"><span class="n" style="color: #333;">checkTyVarEq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">AreTypeFamiliesOK</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CheckTyEqResult</span></span>
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1968
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1968
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<pre style="margin: 0;"> <span id="LC1968" class="line" lang="haskell"><span class="n" style="color: #333;">checkTyVarEq</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">ty_fam_ok</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">ty</span></span>
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1969
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1969
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<pre style="margin: 0;"> <span id="LC1969" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">inline</span> <span class="n" style="color: #333;">checkTypeEq</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">ty_fam_ok</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyVarLHS</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span> <span class="n" style="color: #333;">ty</span></span>
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1970
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1970
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<pre style="margin: 0;"> <span id="LC1970" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- inline checkTypeEq so that the `case`s over the CanEqLHS get blasted away</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1973,13 +1973,13 @@ checkTyFamEq :: DynFlags</td>
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1973
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1973
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<pre style="margin: 0;"> <span id="LC1973" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="c1" style="color: #998; font-style: italic;">-- type function</span></span>
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1974
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1974
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<pre style="margin: 0;"> <span id="LC1974" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- args, exactly saturated</span></span>
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1975
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1975
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<pre style="margin: 0;"> <span id="LC1975" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="c1" style="color: #998; font-style: italic;">-- RHS</span></span>
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1976
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<pre style="margin: 0;">-<span id="LC1976" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">MetaTyVarUpdateResult</span></span><span class="idiff"> </span><span class="nb" style="color: #0086b3;"><span class="idiff right">()</span></span></span>
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1976
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<pre style="margin: 0;">+<span id="LC1976" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CheckTyEqResult</span></span></span>
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1977
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1977
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<pre style="margin: 0;"> <span id="LC1977" class="line" lang="haskell"><span class="n" style="color: #333;">checkTyFamEq</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">fun_tc</span> <span class="n" style="color: #333;">fun_args</span> <span class="n" style="color: #333;">ty</span></span>
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1978
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<td class="diff-line-num new_line" data-linenumber="1978" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1978
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<pre style="margin: 0;"> <span id="LC1978" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">inline</span> <span class="n" style="color: #333;">checkTypeEq</span> <span class="n" style="color: #333;">dflags</span> <span class="kt" style="color: #458; font-weight: 600;">YesTypeFamilies</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyFamLHS</span> <span class="n" style="color: #333;">fun_tc</span> <span class="n" style="color: #333;">fun_args</span><span class="p">)</span> <span class="n" style="color: #333;">ty</span></span>
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<td class="diff-line-num old_line" data-linenumber="1979" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1979
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<td class="diff-line-num new_line" data-linenumber="1979" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1979
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<pre style="margin: 0;"> <span id="LC1979" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- inline checkTypeEq so that the `case`s over the CanEqLHS get blasted away</span></span>
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<td class="diff-line-num old_line" data-linenumber="1980" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1980
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<td class="diff-line-num new_line" data-linenumber="1980" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1980
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<pre style="margin: 0;"> <span id="LC1980" class="line" lang="haskell"></span>
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<td class="diff-line-num old_line" data-linenumber="1981" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1981
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<td class="diff-line-num new_line" data-linenumber="1981" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1981
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<pre style="margin: 0;"> <span id="LC1981" class="line" lang="haskell"><span class="n" style="color: #333;">checkTypeEq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">AreTypeFamiliesOK</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CanEqLHS</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1982" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1982
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<td class="diff-line-num new_line old" data-linenumber="1982" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC1982" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">MetaTyVarUpdateResult</span></span><span class="idiff"> </span><span class="nb" style="color: #0086b3;"><span class="idiff right">()</span></span></span>
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<td class="diff-line-num new old_line" data-linenumber="1983" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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1982
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<pre style="margin: 0;">+<span id="LC1982" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CheckTyEqResult</span></span></span>
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<td class="diff-line-num old_line" data-linenumber="1983" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1983
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<td class="diff-line-num new_line" data-linenumber="1983" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1983
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<pre style="margin: 0;"> <span id="LC1983" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Checks the invariants for CEqCan. In particular:</span></span>
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<td class="diff-line-num old_line" data-linenumber="1984" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1984
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<td class="diff-line-num new_line" data-linenumber="1984" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1984
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<pre style="margin: 0;"> <span id="LC1984" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (a) a forall type (forall a. blah)</span></span>
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<td class="diff-line-num old_line" data-linenumber="1985" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1985
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<td class="diff-line-num new_line" data-linenumber="1985" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1985
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<pre style="margin: 0;"> <span id="LC1985" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (b) a predicate type (c => ty)</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1987" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1987" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1987,6 +1987,14 @@ checkTypeEq :: DynFlags -> AreTypeFamiliesOK -> CanEqLHS -> TcType</td>
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<td class="diff-line-num old_line" data-linenumber="1987" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1987
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<td class="diff-line-num new_line" data-linenumber="1987" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1987
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<pre style="margin: 0;"> <span id="LC1987" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (d) a blocking coercion hole</span></span>
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<td class="diff-line-num old_line" data-linenumber="1988" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1988
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<td class="diff-line-num new_line" data-linenumber="1988" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1988
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<pre style="margin: 0;"> <span id="LC1988" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (e) an occurrence of the LHS (occurs check)</span></span>
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<td class="diff-line-num old_line" data-linenumber="1989" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1989
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<td class="diff-line-num new_line" data-linenumber="1989" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1989
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<pre style="margin: 0;"> <span id="LC1989" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<td class="diff-line-num new old_line" data-linenumber="1990" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="1990" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1990
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<pre style="margin: 0;">+<span id="LC1990" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note that an occurs-check does not mean "definite error". For example</span></span>
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<td class="diff-line-num new old_line" data-linenumber="1990" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="1991" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1991
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<pre style="margin: 0;">+<span id="LC1991" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- type family F a</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1992" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1992
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<pre style="margin: 0;">+<span id="LC1992" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- type instance F Int = Int</span></span>
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<td class="diff-line-num new old_line" data-linenumber="1990" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="1993" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1993
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<pre style="margin: 0;">+<span id="LC1993" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- consider</span></span>
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<td class="diff-line-num new old_line" data-linenumber="1990" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="1994" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1994
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<pre style="margin: 0;">+<span id="LC1994" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- b0 ~ F b0</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1995" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1995
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<pre style="margin: 0;">+<span id="LC1995" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This is perfectly reasonable, if we later get b0 ~ Int. But we</span></span>
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<td class="diff-line-num new old_line" data-linenumber="1990" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="1996" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1996
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<pre style="margin: 0;">+<span id="LC1996" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- certainly can't unify b0 := F b0</span></span>
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<td class="diff-line-num new old_line" data-linenumber="1990" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
</td>
<td class="diff-line-num new new_line" data-linenumber="1997" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1997
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<pre style="margin: 0;">+<span id="LC1997" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<td class="diff-line-num old_line" data-linenumber="1990" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1990
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<td class="diff-line-num new_line" data-linenumber="1998" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1998
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<pre style="margin: 0;"> <span id="LC1998" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- For (a), (b), and (c) we check only the top level of the type, NOT</span></span>
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<td class="diff-line-num old_line" data-linenumber="1991" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1991
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<td class="diff-line-num new_line" data-linenumber="1999" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1999
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<pre style="margin: 0;"> <span id="LC1999" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- inside the kinds of variables it mentions. For (d) we look deeply</span></span>
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1992
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2000
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<pre style="margin: 0;"> <span id="LC2000" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- in coercions when the LHS is a tyvar (but skip coercions for type family</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1994,14 +2002,11 @@ checkTypeEq :: DynFlags -> AreTypeFamiliesOK -> CanEqLHS -> TcType</td>
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1994
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2002
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<pre style="margin: 0;"> <span id="LC2002" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1995
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2003
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<pre style="margin: 0;"> <span id="LC2003" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- checkTypeEq is called from</span></span>
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1996
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2004
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<pre style="margin: 0;"> <span id="LC2004" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * checkTyFamEq, checkTyVarEq (which inline it to specialise away the</span></span>
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1997
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<pre style="margin: 0;">-<span id="LC1997" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- case-analysis on 'lhs'</span></span>
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2005
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<pre style="margin: 0;">+<span id="LC2005" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- case-analysis on 'lhs'<span class="idiff left right">)</span></span></span>
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1998
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2006
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<pre style="margin: 0;"> <span id="LC2006" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * checkEqCanLHSFinish, which does not know the form of 'lhs'</span></span>
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1999
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2007
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<pre style="margin: 0;"> <span id="LC2007" class="line" lang="haskell"><span class="n" style="color: #333;">checkTypeEq</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">ty_fam_ok</span> <span class="n" style="color: #333;">lhs</span> <span class="n" style="color: #333;">ty</span></span>
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2000
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2008
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<pre style="margin: 0;"> <span id="LC2008" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty</span></span>
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2001
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2009
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<pre style="margin: 0;"> <span id="LC2009" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2002
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<pre style="margin: 0;">-<span id="LC2002" class="line" lang="haskell"> <span class="n" style="color: #333;">ok</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">MetaTyVarUpdateResult</span> <span class="nb" style="color: #0086b3;">()</span></span>
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2003
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<pre style="margin: 0;">-<span id="LC2003" class="line" lang="haskell"> <span class="n" style="color: #333;">ok</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MTVU_OK</span> <span class="nb" style="color: #0086b3;">()</span></span>
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2004
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<pre style="margin: 0;">-<span id="LC2004" class="line" lang="haskell"></span>
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2005
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2010
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<pre style="margin: 0;"> <span id="LC2010" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The GHCi runtime debugger does its type-matching with</span></span>
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2006
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2011
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<pre style="margin: 0;"> <span id="LC2011" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- unification variables that can unify with a polytype</span></span>
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2007
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2012
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<pre style="margin: 0;"> <span id="LC2012" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- or a TyCon that would usually be disallowed by bad_tc</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2014" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2014,71 +2019,70 @@ checkTypeEq dflags ty_fam_ok lhs ty</td>
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2014
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2019
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<pre style="margin: 0;"> <span id="LC2019" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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2015
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2020
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<pre style="margin: 0;"> <span id="LC2020" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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2016
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2021
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<pre style="margin: 0;"> <span id="LC2021" class="line" lang="haskell"></span>
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2017
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<pre style="margin: 0;">-<span id="LC2017" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">MetaTyVarUpdateResult</span></span><span class="idiff"> </span><span class="nb" style="color: #0086b3;"><span class="idiff right">()</span></span></span>
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2022
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<pre style="margin: 0;">+<span id="LC2022" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CheckTyEqResult</span></span></span>
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2018
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2023
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<pre style="margin: 0;"> <span id="LC2023" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyVarTy</span> <span class="n" style="color: #333;">tv'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go_tv</span> <span class="n" style="color: #333;">tv'</span></span>
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2019
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2024
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<pre style="margin: 0;"> <span id="LC2024" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyConApp</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go_tc</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span></span>
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2020
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<pre style="margin: 0;">-<span id="LC2020" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LitTy</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left right">ok</span></span></span>
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2025
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<pre style="margin: 0;">+<span id="LC2025" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">LitTy</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CTE_OK</span></span></span>
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2021
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<td class="diff-line-num new_line" data-linenumber="2026" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2026
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<pre style="margin: 0;"> <span id="LC2026" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FunTy</span><span class="p">{</span><span class="n" style="color: #333;">ft_af</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">af</span><span class="p">,</span> <span class="n" style="color: #333;">ft_mult</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">w</span><span class="p">,</span> <span class="n" style="color: #333;">ft_arg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="n" style="color: #333;">ft_res</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">r</span><span class="p">})</span></span>
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2022
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2027
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<pre style="margin: 0;"> <span id="LC2027" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">InvisArg</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">af</span></span>
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2023
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<td class="diff-line-num new_line old" data-linenumber="2028" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC2023" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">ghci_tv</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">MTVU</span>_Bad</span></span>
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2024
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<pre style="margin: 0;">-<span id="LC2024" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">w</span> <span class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff">>></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">go</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">a</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">></span>></span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">r</span></span>
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2025
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<pre style="margin: 0;">-<span id="LC2025" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AppTy</span> <span class="n" style="color: #333;">fun</span> <span class="n" style="color: #333;">arg</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">fun</span> <span class="o" style="font-weight: 600;"><span class="idiff left right">></span>></span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">arg</span></span>
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<td class="diff-line-num old old_line" data-linenumber="2026" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2026
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<pre style="margin: 0;">-<span id="LC2026" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CastTy</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;"><span class="idiff left right">></span>></span> <span class="n" style="color: #333;">go_co</span> <span class="n" style="color: #333;">co</span></span>
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<td class="diff-line-num new old_line" data-linenumber="2027" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="2028" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2028
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<pre style="margin: 0;">+<span id="LC2028" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">ghci_tv</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CTE</span>_Bad</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2029" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2029
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<pre style="margin: 0;">+<span id="LC2029" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">w</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">S</span></span><span class="o" style="font-weight: 600;"><span class="idiff">.<></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">go</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">a</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">S</span></span><span class="o" style="font-weight: 600;"><span class="idiff right">.<</span>></span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">r</span></span>
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2030
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<pre style="margin: 0;">+<span id="LC2030" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">AppTy</span> <span class="n" style="color: #333;">fun</span> <span class="n" style="color: #333;">arg</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">fun</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">S</span></span><span class="o" style="font-weight: 600;"><span class="idiff right">.<</span>></span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">arg</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2031" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2031
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<pre style="margin: 0;">+<span id="LC2031" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CastTy</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">S</span></span><span class="o" style="font-weight: 600;"><span class="idiff right">.<</span>></span> <span class="n" style="color: #333;">go_co</span> <span class="n" style="color: #333;">co</span></span>
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2027
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<td class="diff-line-num new_line" data-linenumber="2032" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2032
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<pre style="margin: 0;"> <span id="LC2032" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoercionTy</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go_co</span> <span class="n" style="color: #333;">co</span></span>
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2028
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<td class="diff-line-num new_line" data-linenumber="2033" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2033
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<pre style="margin: 0;"> <span id="LC2033" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ForAllTy</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Bndr</span> <span class="n" style="color: #333;">tv'</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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2029
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<td class="diff-line-num new_line old" data-linenumber="2034" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC2029" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">ghci_tv</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">MTVU</span>_Bad</span></span>
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2034
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<pre style="margin: 0;">+<span id="LC2034" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">ghci_tv</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CTE</span>_Bad</span></span>
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2030
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2035
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<pre style="margin: 0;"> <span id="LC2035" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lhs</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2031
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<pre style="margin: 0;">-<span id="LC2031" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TyVarLHS</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">tv'</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">ok</span></span>
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2032
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<pre style="margin: 0;">-<span id="LC2032" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">go_occ</span> <span class="n" style="color: #333;">tv</span> <span class="p">(</span><span class="n" style="color: #333;">tyVarKind</span> <span class="n" style="color: #333;">tv'</span><span class="p">)</span></span>
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2033
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<pre style="margin: 0;">-<span id="LC2033" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty</span> <span class="p">}</span></span>
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2036
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<pre style="margin: 0;">+<span id="LC2036" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TyVarLHS</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">tv'</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CTE_OK</span></span>
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2037
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<pre style="margin: 0;">+<span id="LC2037" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">go_occ</span> <span class="n" style="color: #333;">tv</span> <span class="p">(</span><span class="n" style="color: #333;">tyVarKind</span> <span class="n" style="color: #333;">tv'</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">S</span><span class="o" style="font-weight: 600;">.<></span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty</span></span>
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2034
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2038
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<pre style="margin: 0;"> <span id="LC2038" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty</span></span>
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2035
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2039
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<pre style="margin: 0;"> <span id="LC2039" class="line" lang="haskell"></span>
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2036
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<pre style="margin: 0;">-<span id="LC2036" class="line" lang="haskell"> <span class="n" style="color: #333;">go_tv</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">MetaTyVarUpdateResult</span></span><span class="idiff"> </span><span class="nb" style="color: #0086b3;"><span class="idiff right">()</span></span></span>
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2040
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<pre style="margin: 0;">+<span id="LC2040" class="line" lang="haskell"> <span class="n" style="color: #333;">go_tv</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CheckTyEqResult</span></span></span>
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2041
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<pre style="margin: 0;"> <span id="LC2041" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- this slightly peculiar way of defining this means</span></span>
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2038
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2042
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<pre style="margin: 0;"> <span id="LC2042" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we don't have to evaluate this `case` at every variable</span></span>
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2039
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2043
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<pre style="margin: 0;"> <span id="LC2043" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- occurrence</span></span>
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2040
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2044
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<pre style="margin: 0;"> <span id="LC2044" class="line" lang="haskell"> <span class="n" style="color: #333;">go_tv</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lhs</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2041
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2045
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<pre style="margin: 0;"> <span id="LC2045" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TyVarLHS</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">-></span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">tv'</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">tv'</span></span>
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2042
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<pre style="margin: 0;">-<span id="LC2042" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">MTVU</span>_Occurs</span></span>
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2046
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<pre style="margin: 0;">+<span id="LC2046" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CTE</span>_Occurs</span></span>
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2043
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2047
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<pre style="margin: 0;"> <span id="LC2047" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">go_occ</span> <span class="n" style="color: #333;">tv</span> <span class="p">(</span><span class="n" style="color: #333;">tyVarKind</span> <span class="n" style="color: #333;">tv'</span><span class="p">)</span></span>
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2044
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<pre style="margin: 0;">-<span id="LC2044" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TyFamLHS</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">_tv'</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;"><span class="idiff left right">ok</span></span></span>
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<pre style="margin: 0;">+<span id="LC2048" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TyFamLHS</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">_tv'</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CTE_OK</span></span></span>
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2049
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<pre style="margin: 0;"> <span id="LC2049" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Occurrence checking: look inside kinds] in GHC.Core.Type</span></span>
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2046
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2050
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<pre style="margin: 0;"> <span id="LC2050" class="line" lang="haskell"></span>
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2047
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2051
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<pre style="margin: 0;"> <span id="LC2051" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- For kinds, we only do an occurs check; we do not worry</span></span>
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2048
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2052
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<pre style="margin: 0;"> <span id="LC2052" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- about type families or foralls</span></span>
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2049
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2053
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<pre style="margin: 0;"> <span id="LC2053" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Checking for foralls]</span></span>
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2050
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<pre style="margin: 0;">-<span id="LC2050" class="line" lang="haskell"> <span class="n" style="color: #333;">go_occ</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">tv</span> <span class="p">`</span><span class="n" style="color: #333;">elemVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">tyCoVarsOfType</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">MTVU</span>_Occurs</span></span>
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2051
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<pre style="margin: 0;">-<span id="LC2051" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left right">ok</span></span></span>
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2054
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<pre style="margin: 0;">+<span id="LC2054" class="line" lang="haskell"> <span class="n" style="color: #333;">go_occ</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">tv</span> <span class="p">`</span><span class="n" style="color: #333;">elemVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">tyCoVarsOfType</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CTE</span>_Occurs</span></span>
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2055
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<pre style="margin: 0;">+<span id="LC2055" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CTE_OK</span></span></span>
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2052
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2056
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<pre style="margin: 0;"> <span id="LC2056" class="line" lang="haskell"></span>
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2053
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<pre style="margin: 0;">-<span id="LC2053" class="line" lang="haskell"> <span class="n" style="color: #333;">go_tc</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">MetaTyVarUpdateResult</span></span><span class="idiff"> </span><span class="nb" style="color: #0086b3;"><span class="idiff right">()</span></span></span>
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<pre style="margin: 0;">+<span id="LC2057" class="line" lang="haskell"> <span class="n" style="color: #333;">go_tc</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CheckTyEqResult</span></span></span>
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2054
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2058
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<pre style="margin: 0;"> <span id="LC2058" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- this slightly peculiar way of defining this means</span></span>
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2055
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2059
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<pre style="margin: 0;"> <span id="LC2059" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we don't have to evaluate this `case` at every tyconapp</span></span>
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2056
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2060
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<pre style="margin: 0;"> <span id="LC2060" class="line" lang="haskell"> <span class="n" style="color: #333;">go_tc</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lhs</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2057
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2061
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<pre style="margin: 0;"> <span id="LC2061" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TyVarLHS</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span> <span class="o" style="font-weight: 600;">-></span></span>
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2058
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<pre style="margin: 0;">-<span id="LC2058" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">if</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">good_tc</span> <span class="n" style="color: #333;">tc</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">m<span class="idiff left">apM</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">go</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tys</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">>></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">ok</span></span></span>
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2059
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<pre style="margin: 0;">-<span id="LC2059" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">MTVU</span>_Bad</span></span>
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2062
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<pre style="margin: 0;">+<span id="LC2062" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">if</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">good_tc</span> <span class="n" style="color: #333;">tc</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">m<span class="idiff left">concat</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">map</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">go</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tys</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC2063" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CTE</span>_Bad</span></span>
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2060
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2064
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<pre style="margin: 0;"> <span id="LC2064" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TyFamLHS</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">fam_args</span> <span class="o" style="font-weight: 600;">-></span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span> <span class="o" style="font-weight: 600;">-></span></span>
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2061
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<pre style="margin: 0;">-<span id="LC2061" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">if</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">tcEqTyConApps</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">fam_args</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">MTVU</span>_Occurs</span></span>
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2062
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<pre style="margin: 0;">-<span id="LC2062" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">good_tc</span> <span class="n" style="color: #333;">tc</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">m<span class="idiff left">apM</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">go</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tys</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">>></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">ok</span></span></span>
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2063
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<td class="diff-line-num new_line old" data-linenumber="2065" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC2063" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">MTVU</span>_Bad</span></span>
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2065
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<pre style="margin: 0;">+<span id="LC2065" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">if</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">tcEqTyConApps</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">fam_args</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CTE</span>_Occurs</span></span>
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2066
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<pre style="margin: 0;">+<span id="LC2066" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">good_tc</span> <span class="n" style="color: #333;">tc</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">m<span class="idiff left">concat</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">map</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">go</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tys</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<td class="diff-line-num new new_line" data-linenumber="2067" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2067
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<pre style="margin: 0;">+<span id="LC2067" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CTE</span>_Bad</span></span>
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2064
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2068
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<pre style="margin: 0;"> <span id="LC2068" class="line" lang="haskell"></span>
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2065
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2069
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<pre style="margin: 0;"> <span id="LC2069" class="line" lang="haskell"></span>
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2066
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2070
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<pre style="margin: 0;"> <span id="LC2070" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- no bother about impredicativity in coercions, as they're</span></span>
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2067
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2071
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<pre style="margin: 0;"> <span id="LC2071" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- inferred</span></span>
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2068
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2072
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<pre style="margin: 0;"> <span id="LC2072" class="line" lang="haskell"> <span class="n" style="color: #333;">go_co</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">gopt</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_DeferTypeErrors</span> <span class="n" style="color: #333;">dflags</span><span class="p">)</span></span>
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2069
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2073
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<pre style="margin: 0;"> <span id="LC2073" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hasCoercionHoleCo</span> <span class="n" style="color: #333;">co</span></span>
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2070
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<pre style="margin: 0;">-<span id="LC2070" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">MTVU</span>_HoleBlocker</span> <span class="c1" style="color: #998; font-style: italic;">-- Wrinkle (2) in GHC.Tc.Solver.Canonical</span></span>
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2074
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<pre style="margin: 0;">+<span id="LC2074" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CTE</span>_HoleBlocker</span> <span class="c1" style="color: #998; font-style: italic;">-- Wrinkle (2) in GHC.Tc.Solver.Canonical</span></span>
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2071
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2075
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<pre style="margin: 0;"> <span id="LC2075" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See GHC.Tc.Solver.Canonical Note [Equalities with incompatible kinds]</span></span>
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2072
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2076
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<pre style="margin: 0;"> <span id="LC2076" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Wrinkle (2) about this case in general, Wrinkle (4b) about the check for</span></span>
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2073
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2077
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<pre style="margin: 0;"> <span id="LC2077" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- deferred type errors.</span></span>
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2074
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2078
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<pre style="margin: 0;"> <span id="LC2078" class="line" lang="haskell"></span>
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2075
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2079
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<pre style="margin: 0;"> <span id="LC2079" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">TyVarLHS</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lhs</span></span>
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2080
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<pre style="margin: 0;"> <span id="LC2080" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tv</span> <span class="p">`</span><span class="n" style="color: #333;">elemVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">tyCoVarsOfCo</span> <span class="n" style="color: #333;">co</span></span>
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<pre style="margin: 0;">-<span id="LC2077" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">MTVU</span>_Occurs</span></span>
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<pre style="margin: 0;">+<span id="LC2081" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CTE</span>_Occurs</span></span>
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2082
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<pre style="margin: 0;"> <span id="LC2082" class="line" lang="haskell"></span>
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2083
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<pre style="margin: 0;"> <span id="LC2083" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Don't check coercions for type families; see commentary at top of function</span></span>
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2084
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<pre style="margin: 0;"> <span id="LC2084" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<pre style="margin: 0;">-<span id="LC2081" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left right">ok</span></span></span>
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<pre style="margin: 0;">+<span id="LC2085" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CTE_OK</span></span></span>
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2086
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<pre style="margin: 0;"> <span id="LC2086" class="line" lang="haskell"></span>
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2087
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<pre style="margin: 0;"> <span id="LC2087" class="line" lang="haskell"> <span class="n" style="color: #333;">good_tc</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;"> <span id="LC2088" class="line" lang="haskell"> <span class="n" style="color: #333;">good_tc</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4f85f14177d0b2be1c1489bc69ad4f69372e1fb4#be3176dd680b038f442161581e992924140d0404"><strong>testsuite/tests/ghci.debugger/scripts/break012.stdout</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext">Stopped in Main.g, break012.hs:5:10-18</span>
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<pre style="margin: 0;">-<span id="LC2" class="line" lang="plaintext">_result :: (<span class="idiff left right">p, a1 -> a1</span>, (), a -> a -> a) = _</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext">a :: <span class="idiff left right">p</span> = _</span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext">b :: a<span class="idiff left right">2 -> a2</span> = _</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">_result :: (<span class="idiff left right">a1, a2 -> a2</span>, (), a -> a -> a) = _</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext">a :: <span class="idiff left right">a1</span> = _</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext">b :: a<span class="idiff left right">3 -> a3</span> = _</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext">c :: () = _</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext">d :: a -> a -> a = _</span>
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<pre style="margin: 0;">-<span id="LC7" class="line" lang="plaintext">a :: <span class="idiff left right">p</span></span>
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<pre style="margin: 0;">-<span id="LC8" class="line" lang="plaintext">b :: a<span class="idiff left right">2 -> a2</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext">a :: <span class="idiff left right">a1</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext">b :: a<span class="idiff left right">3 -> a3</span></span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="plaintext">c :: ()</span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="plaintext">d :: a -> a -> a</span>
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<pre style="margin: 0;">-<span id="LC11" class="line" lang="plaintext">a = (_t1::<span class="idiff left right">p</span>)</span>
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<pre style="margin: 0;">-<span id="LC12" class="line" lang="plaintext">b = (_t2::a<span class="idiff left right">2 -> a2</span>)</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext">a = (_t1::<span class="idiff left right">a1</span>)</span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext">b = (_t2::a<span class="idiff left right">3 -> a3</span>)</span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="plaintext">c = (_t3::())</span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="plaintext">d = (_t4::a -> a -> a)</span></pre>
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<li id="fdad8ca739f3d61752da4e6fec4e8e7e5604fb9a">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4f85f14177d0b2be1c1489bc69ad4f69372e1fb4#fdad8ca739f3d61752da4e6fec4e8e7e5604fb9a"><strong>testsuite/tests/partial-sigs/should_compile/T10403.stderr</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -14,35 +14,18 @@ T10403.hs:15:12: warning: [-Wpartial-type-signatures (in -Wdefault)]</td>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="plaintext"> • In the type signature: h1 :: _ => _</span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="plaintext">T10403.hs:19:7: warning: [-Wpartial-type-signatures (in -Wdefault)]</span>
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<pre style="margin: 0;">-<span id="LC17" class="line" lang="plaintext"> • Found type wildcard ‘_’ standing for ‘(a -> a1) -> f0 a -> H f0’</span>
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<pre style="margin: 0;">-<span id="LC18" class="line" lang="plaintext"> Where: ‘f0’ is an ambiguous type variable</span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="plaintext"> • Found type wildcard ‘_’</span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext"> standing for ‘(a -> a1) -> B t0 a -> H (B t0)’</span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="plaintext"> Where: ‘t0’ is an ambiguous type variable</span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="plaintext"> ‘a1’, ‘a’ are rigid type variables bound by</span>
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<pre style="margin: 0;">-<span id="LC20" class="line" lang="plaintext"> the inferred type of h2 :: (a -> a1) -> <span class="idiff left right">f0 a -> H f0</span></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="plaintext"> the inferred type of h2 :: (a -> a1) -> <span class="idiff left right">B t0 a -> H (B t0)</span></span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="plaintext"> at T10403.hs:22:1-41</span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="plaintext"> • In the type signature: h2 :: _</span>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC24" class="line" lang="plaintext">T10403.hs:22:15: warning: [-Wdeferred-type-errors (in -Wdefault)]</span>
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<pre style="margin: 0;">-<span id="LC25" class="line" lang="plaintext"> • Ambiguous type variable ‘f0’ arising from a use of ‘fmap’</span>
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<pre style="margin: 0;">-<span id="LC26" class="line" lang="plaintext"> prevents the constraint ‘(Functor f0)’ from being solved.</span>
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<pre style="margin: 0;">-<span id="LC27" class="line" lang="plaintext"> Relevant bindings include</span>
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<pre style="margin: 0;">-<span id="LC28" class="line" lang="plaintext"> b :: f0 a (bound at T10403.hs:22:6)</span>
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<pre style="margin: 0;">-<span id="LC29" class="line" lang="plaintext"> h2 :: (a -> a1) -> f0 a -> H f0 (bound at T10403.hs:22:1)</span>
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<pre style="margin: 0;">-<span id="LC30" class="line" lang="plaintext"> Probable fix: use a type annotation to specify what ‘f0’ should be.</span>
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<pre style="margin: 0;">-<span id="LC31" class="line" lang="plaintext"> These potential instances exist:</span>
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<pre style="margin: 0;">-<span id="LC32" class="line" lang="plaintext"> instance Functor IO -- Defined in ‘GHC.Base’</span>
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<pre style="margin: 0;">-<span id="LC33" class="line" lang="plaintext"> instance Functor (B t) -- Defined at T10403.hs:10:10</span>
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<pre style="margin: 0;">-<span id="LC34" class="line" lang="plaintext"> instance Functor I -- Defined at T10403.hs:6:10</span>
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<pre style="margin: 0;">-<span id="LC35" class="line" lang="plaintext"> ...plus five others</span>
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<pre style="margin: 0;">-<span id="LC36" class="line" lang="plaintext"> ...plus two instances involving out-of-scope types</span>
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<pre style="margin: 0;">-<span id="LC37" class="line" lang="plaintext"> (use -fprint-potential-instances to see them all)</span>
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<pre style="margin: 0;">-<span id="LC38" class="line" lang="plaintext"> • In the second argument of ‘(.)’, namely ‘fmap (const ())’</span>
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<pre style="margin: 0;">-<span id="LC39" class="line" lang="plaintext"> In the expression: (H . fmap (const ())) (fmap f b)</span>
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<pre style="margin: 0;">-<span id="LC40" class="line" lang="plaintext"> In an equation for ‘h2’: h2 f b = (H . fmap (const ())) (fmap f b)</span>
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<pre style="margin: 0;">-<span id="LC41" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="plaintext">T10403.hs:28:8: warning: [-Wdeferred-type-errors (in -Wdefault)]</span>
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<pre style="margin: 0;">-<span id="LC43" class="line" lang="plaintext"> • Couldn't match type ‘<span class="idiff left right">f0’ with ‘B </span>t’</span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="plaintext"> • Couldn't match type ‘<span class="idiff left right">t0’ with ‘</span>t’</span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="plaintext"> Expected: H (B t)</span>
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<pre style="margin: 0;">-<span id="LC45" class="line" lang="plaintext"> Actual: H <span class="idiff left right">f0</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="plaintext"> Actual: H <span class="idiff left right">(B t0)</span></span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="plaintext"> because type variable ‘t’ would escape its scope</span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="plaintext"> This (rigid, skolem) type variable is bound by</span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="plaintext"> the type signature for:</span>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">T14715.hs:13:53: warning: [-Wpartial-type-signatures (in -Wdefault)]</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • Found extra-constraints wildcard standing for</span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> ‘Reduce (LiftOf zq) zq’</span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> Where: ‘zq’ is a rigid type variable bound by</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Found extra-constraints wildcard standing for ‘Reduce z zq’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> Where: ‘z’, ‘zq’ are rigid type variables bound by</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> the inferred type of</span>
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<pre style="margin: 0;">-<span id="LC7" class="line" lang="plaintext"> bench_mulPublic :: (z ~ LiftOf zq, Reduce <span class="idiff left right">(LiftOf zq)</span> zq) =></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> bench_mulPublic :: (z ~ LiftOf zq, Reduce <span class="idiff left right">z</span> zq) =></span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext"> Cyc zp -> Cyc z -> IO (zp, zq)</span>
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<pre style="margin: 0;">-<span id="LC9" class="line" lang="plaintext"> at T14715.hs:13:<span class="idiff left right">32</span>-33</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext"> at T14715.hs:13:<span class="idiff left right">27</span>-33</span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="plaintext"> • In the type signature:</span>
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<pre style="margin: 0;">-<span id="LC11" class="line" lang="plaintext"> bench_mulPublic :: forall z zp zq.</span>
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<pre style="margin: 0;">-<span id="LC12" class="line" lang="plaintext"> <span class="idiff left right">(z ~ LiftOf zq, _) =></span> Cyc zp -> Cyc z -> IO (zp, zq)</span></pre>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext"> bench_mulPublic :: forall z zp zq.<span class="idiff left right"> (z ~ LiftOf zq, _) =></span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext"> <span class="idiff left right"> </span> Cyc zp -> Cyc z -> IO (zp, zq)</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4f85f14177d0b2be1c1489bc69ad4f69372e1fb4#d9b84a6a85857ca6c1c54a44783355ad60647fa0"><strong>testsuite/tests/partial-sigs/should_fail/ScopedNamedWildcardsBad.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC2" class="line" lang="plaintext">ScopedNamedWildcardsBad.hs:<span class="idiff left right">8:21</span>: error:</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">ScopedNamedWildcardsBad.hs:<span class="idiff left right">11:15</span>: error:</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> • Couldn't match expected type ‘Bool’ with actual type ‘Char’</span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> • In the first argument of ‘not’, namely ‘x’</span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> In the expression: not x</span>
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext"> In an equation for ‘v’: v = not x</span></pre>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> • In the first argument of ‘g’, namely ‘'x'’</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> In the expression: g 'x'</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> In the expression:</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> let</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext"> v = not x</span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext"> g :: _a -> _a</span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext"> g x = x</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext"> in (g 'x')</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4f85f14177d0b2be1c1489bc69ad4f69372e1fb4#d67673f1f07a2cd7b42addb9d5e4bdb29f7a7002"><strong>testsuite/tests/typecheck/should_fail/ExpandSynsFail2.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">ExpandSynsFail2.hs:19:37: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • Couldn't match type ‘<span class="idiff left right">Int’ with ‘Bool</span>’</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Couldn't match type ‘<span class="idiff left right">Bool’ with ‘Int</span>’</span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"> Expected: ST s Foo</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> Actual: MyBarST s</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> Type synonyms expanded:</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4f85f14177d0b2be1c1489bc69ad4f69372e1fb4#1ebf0c75765ea8946e5ea0a914d6d48df2f66b33"><strong>testsuite/tests/typecheck/should_fail/T7453.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC2" class="line" lang="plaintext">T7453.hs:10:30: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • Couldn't match expected type ‘t’ with actual type ‘p’</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T7453.hs:9:15: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Couldn't match type ‘t’ with ‘p’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> Expected: Id t</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> Actual: Id p</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> ‘t’ is a rigid type variable bound by</span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext"> the type signature for:</span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="plaintext"> z :: forall t. Id t</span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -8,17 +10,29 @@ T7453.hs:10:30: error:</td>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="plaintext"> ‘p’ is a rigid type variable bound by</span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="plaintext"> the inferred type of cast1 :: p -> a</span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="plaintext"> at T7453.hs:(7,1)-(10,30)</span>
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<pre style="margin: 0;">-<span id="LC11" class="line" lang="plaintext"> • In the first argument of ‘Id’, namely ‘v’</span>
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<pre style="margin: 0;">-<span id="LC12" class="line" lang="plaintext"> In the expression: Id v</span>
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<pre style="margin: 0;">-<span id="LC13" class="line" lang="plaintext"> In an equation for ‘aux’: aux = Id v</span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext"> • In the expression: aux</span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext"> In an equation for ‘z’:</span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="plaintext"> z = aux</span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="plaintext"> where</span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="plaintext"> aux = Id v</span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext"> In an equation for ‘cast1’:</span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="plaintext"> cast1 v</span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="plaintext"> = runId z</span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="plaintext"> where</span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="plaintext"> z :: Id t</span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="plaintext"> z = aux</span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="plaintext"> where</span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="plaintext"> aux = Id v</span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="plaintext"> • Relevant bindings include</span>
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<pre style="margin: 0;">-<span id="LC15" class="line" lang="plaintext"> aux :: Id <span class="idiff left right">t</span> (bound at T7453.hs:10:21)</span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="plaintext"> aux :: Id <span class="idiff left right">p</span> (bound at T7453.hs:10:21)</span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="plaintext"> z :: Id t (bound at T7453.hs:9:11)</span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="plaintext"> v :: p (bound at T7453.hs:7:7)</span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="plaintext"> cast1 :: p -> a (bound at T7453.hs:7:1)</span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC20" class="line" lang="plaintext">T7453.hs:16:33: error:</span>
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<pre style="margin: 0;">-<span id="LC21" class="line" lang="plaintext"> • Couldn't match expected type ‘t1’ with actual type ‘p’</span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="plaintext">T7453.hs:15:15: error:</span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="plaintext"> • Couldn't match type ‘t1’ with ‘p’</span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="plaintext"> Expected: () -> t1</span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="plaintext"> Actual: () -> p</span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="plaintext"> ‘t1’ is a rigid type variable bound by</span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="plaintext"> the type signature for:</span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="plaintext"> z :: forall t1. () -> t1</span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -26,11 +40,21 @@ T7453.hs:16:33: error:</td>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="plaintext"> ‘p’ is a rigid type variable bound by</span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="plaintext"> the inferred type of cast2 :: p -> t</span>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="plaintext"> at T7453.hs:(13,1)-(16,33)</span>
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<pre style="margin: 0;">-<span id="LC29" class="line" lang="plaintext"> • In the first argument of ‘const’, namely ‘v’</span>
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<pre style="margin: 0;">-<span id="LC30" class="line" lang="plaintext"> In the expression: const v</span>
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<pre style="margin: 0;">-<span id="LC31" class="line" lang="plaintext"> In an equation for ‘aux’: aux = const v</span>
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<pre style="margin: 0;">+<span id="LC43" class="line" lang="plaintext"> • In the expression: aux</span>
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<pre style="margin: 0;">+<span id="LC44" class="line" lang="plaintext"> In an equation for ‘z’:</span>
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<pre style="margin: 0;">+<span id="LC45" class="line" lang="plaintext"> z = aux</span>
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<pre style="margin: 0;">+<span id="LC46" class="line" lang="plaintext"> where</span>
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<pre style="margin: 0;">+<span id="LC47" class="line" lang="plaintext"> aux = const v</span>
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<pre style="margin: 0;">+<span id="LC48" class="line" lang="plaintext"> In an equation for ‘cast2’:</span>
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<pre style="margin: 0;">+<span id="LC49" class="line" lang="plaintext"> cast2 v</span>
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<pre style="margin: 0;">+<span id="LC50" class="line" lang="plaintext"> = z ()</span>
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<pre style="margin: 0;">+<span id="LC51" class="line" lang="plaintext"> where</span>
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<pre style="margin: 0;">+<span id="LC52" class="line" lang="plaintext"> z :: () -> t</span>
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<pre style="margin: 0;">+<span id="LC53" class="line" lang="plaintext"> z = aux</span>
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<pre style="margin: 0;">+<span id="LC54" class="line" lang="plaintext"> where</span>
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<pre style="margin: 0;">+<span id="LC55" class="line" lang="plaintext"> aux = const v</span>
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="plaintext"> • Relevant bindings include</span>
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<pre style="margin: 0;">-<span id="LC33" class="line" lang="plaintext"> aux :: <span class="idiff left right">b -> t1</span> (bound at T7453.hs:16:21)</span>
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<pre style="margin: 0;">+<span id="LC57" class="line" lang="plaintext"> aux :: <span class="idiff left right">forall {b}. b -> p</span> (bound at T7453.hs:16:21)</span>
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<pre style="margin: 0;"> <span id="LC58" class="line" lang="plaintext"> z :: () -> t1 (bound at T7453.hs:15:11)</span>
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<pre style="margin: 0;"> <span id="LC59" class="line" lang="plaintext"> v :: p (bound at T7453.hs:13:7)</span>
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<pre style="margin: 0;"> <span id="LC60" class="line" lang="plaintext"> cast2 :: p -> t (bound at T7453.hs:13:1)</span>
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