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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>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d1ff4302a8e92852d90d754f1d2de1ed509d4468">d1ff4302</a></strong>
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<span>by Simon Peyton Jones</span>
<i>at 2020-12-09T23:35:41+00:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Wibbles
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<h4>6 changed files:</h4>
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<a href="#8858278b4cb7284f96b29b5564bcb426de4fae70">
compiler/GHC/Runtime/Heap/Inspect.hs
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<a href="#6a1f039ed7725eddef15dd5f4dc318a3434f26c9">
compiler/GHC/Tc/Gen/App.hs
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<a href="#54436e21ea530a66a8a71bcc01c836f4740b8f02">
compiler/GHC/Tc/Solver.hs
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<a href="#f018e77421f495c6f75733fee4a511cfe57bebe8">
compiler/GHC/Tc/Solver/Canonical.hs
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<a href="#0c6b585a8a21f8340a85ca2cef89c4b1bf5a8953">
compiler/GHC/Tc/Solver/Monad.hs
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<a href="#74295edeac870ee7f2f3484ebaffab5c948b735a">
compiler/GHC/Tc/Utils/Unify.hs
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<h4>Changes:</h4>
<li id="8858278b4cb7284f96b29b5564bcb426de4fae70">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d1ff4302a8e92852d90d754f1d2de1ed509d4468#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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<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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<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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<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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<pre style="margin: 0;"> <span id="LC583" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d1ff4302a8e92852d90d754f1d2de1ed509d4468#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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911
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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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912
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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/d1ff4302a8e92852d90d754f1d2de1ed509d4468#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">@@ -1674,11 +1674,11 @@ solveWanteds wc@(WC { wc_simple = simples, wc_impl = implics, wc_holes = holes }</td>
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<pre style="margin: 0;"> <span id="LC1674" 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="LC1675" 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="LC1676" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1677" class="line" lang="haskell"> <span class="p">;</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">implics2</span></span><span class="p"><span class="idiff right">)</span></span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">solveNestedImplications</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC1678" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="n" style="color: #333;">implics</span> <span class="p">`</span><span class="n" style="color: #333;">unionBags</span><span class="p">`</span> <span class="n" style="color: #333;">wc_impl</span> <span class="n" style="color: #333;">wc1</span></span>
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<pre style="margin: 0;">+<span id="LC1677" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;"><span class="idiff left right">implics2</span></span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">solveNestedImplications</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC1678" 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="LC1679" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1680" 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="LC1681" 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;"><span class="idiff left right">g</span>etUnificationFlag</span></span>
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<pre style="margin: 0;">+<span id="LC1681" 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;"><span class="idiff left right">res</span>etUnificationFlag</span></span>
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<pre style="margin: 0;"> <span id="LC1682" 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;">unif_happened</span></span>
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<pre style="margin: 0;"> <span id="LC1683" 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="LC1684" 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">@@ -1704,17 +1704,12 @@ simpl_loop n limit unif_happened wc@(WC { wc_simple = simples })</td>
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<pre style="margin: 0;"> <span id="LC1704" 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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<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;">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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1706
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<pre style="margin: 0;"> <span id="LC1706" 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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<pre style="margin: 0;">-<span id="LC1707" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- , ppUnless (isEmptyBag floated_eqs) $</span></span>
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<pre style="margin: 0;">-<span id="LC1708" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- text "Floated equalities:" <+> ppr floated_eqs</span></span>
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1709
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1707
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<pre style="margin: 0;"> <span id="LC1707" 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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<pre style="margin: 0;"> <span id="LC1708" class="line" lang="haskell"> <span class="p">]))</span></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;">return</span> <span class="n" style="color: #333;">wc</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>
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1713
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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;">unif_happened</span></span>
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1714
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1712
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<pre style="margin: 0;"> <span id="LC1712" 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="n" style="color: #333;">wc</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;">-- Put floated_eqs first so they get solved first</span></span>
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1716
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<pre style="margin: 0;">-<span id="LC1716" 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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1717
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<pre style="margin: 0;">-<span id="LC1717" 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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1718
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1713
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<pre style="margin: 0;"> <span id="LC1713" class="line" lang="haskell"></span>
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1719
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1714
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<pre style="margin: 0;"> <span id="LC1714" 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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1720
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1715
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<pre style="margin: 0;"> <span id="LC1715" 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="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1747,55 +1742,33 @@ simplify_again n limit no_new_given_scs</td>
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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="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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1749
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1744
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<pre style="margin: 0;"> <span id="LC1744" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1750" class="line" lang="haskell"> <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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1751
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<pre style="margin: 0;">-<span id="LC1751" 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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1752
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<pre style="margin: 0;">-<span id="LC1752" 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;">getUnificationFlag</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="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;">unif_happened</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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<pre style="margin: 0;">+<span id="LC1745" class="line" lang="haskell"> <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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<pre style="margin: 0;">+<span id="LC1746" 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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1747
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<pre style="margin: 0;"> <span id="LC1747" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1755" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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1756
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<pre style="margin: 0;">-<span id="LC1756" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- See Note [Cutting off simpl_loop]</span></span>
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1757
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<pre style="margin: 0;">-<span id="LC1757" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- We have already tried to solve the nested implications once</span></span>
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1758
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<pre style="margin: 0;">-<span id="LC1758" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- Try again only if we have unified some meta-variables</span></span>
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1759
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<pre style="margin: 0;">-<span id="LC1759" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- (which is a bit like adding more givens), or we have some</span></span>
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1760
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<pre style="margin: 0;">-<span id="LC1760" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- new Given superclasses</span></span>
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1761
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<pre style="margin: 0;">-<span id="LC1761" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; let new_implics = wc_impl wc1</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;"> ; if no_new_given_scs &&</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;"> isEmptyBag new_implics</span></span>
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1764
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<pre style="margin: 0;">-<span id="LC1764" class="line" lang="haskell"></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;"> then -- Do not even try to solve the implications</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;"> simpl_loop (n+1) limit emptyBag (wc1 { wc_impl = implics })</span></span>
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1767
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<pre style="margin: 0;">-<span id="LC1767" class="line" lang="haskell"></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;"> else -- Try to solve the implications</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;"> do { (floated_eqs2, implics2) <- solveNestedImplications $</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;"> implics `unionBags` new_implics</span></span>
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1771
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<pre style="margin: 0;">-<span id="LC1771" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; simpl_loop (n+1) limit floated_eqs2 (wc1 { wc_impl = implics2 }) }</span></span>
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1772
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<pre style="margin: 0;">-<span id="LC1772" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1773
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<pre style="margin: 0;">-<span id="LC1773" class="line" lang="haskell"> <span class="p">}</span></span>
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1748
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<pre style="margin: 0;">+<span id="LC1748" 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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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;">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;">unif_happened</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 class="p">}</span></span>
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1774
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1750
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<pre style="margin: 0;"> <span id="LC1750" class="line" lang="haskell"></span>
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1775
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1751
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<pre style="margin: 0;"> <span id="LC1751" 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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1776
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<pre style="margin: 0;">-<span id="LC1776" 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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1752
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<pre style="margin: 0;">+<span id="LC1752" 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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1777
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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;">-- Precondition: the TcS inerts may contain unsolved simples which have</span></span>
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<pre style="margin: 0;"> <span id="LC1754" 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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1755
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<pre style="margin: 0;"> <span id="LC1755" 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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1780
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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;">isEmptyBag</span> <span class="n" style="color: #333;">implics</span></span>
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1781
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<pre style="margin: 0;">-<span id="LC1781" 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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1757
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<pre style="margin: 0;">+<span id="LC1757" 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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1782
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1758
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<pre style="margin: 0;"> <span id="LC1758" 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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1783
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1759
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<pre style="margin: 0;"> <span id="LC1759" 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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1784
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<pre style="margin: 0;">-<span id="LC1784" 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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1785
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<pre style="margin: 0;">-<span id="LC1785" 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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1760
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<pre style="margin: 0;">+<span id="LC1760" 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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1786
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1761
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<pre style="margin: 0;"> <span id="LC1761" class="line" lang="haskell"></span>
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1787
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1762
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<pre style="margin: 0;"> <span id="LC1762" 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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1788
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1763
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<pre style="margin: 0;"> <span id="LC1763" 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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1789
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1764
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<pre style="margin: 0;"> <span id="LC1764" 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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1790
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1765
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<pre style="margin: 0;"> <span id="LC1765" 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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1791
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<pre style="margin: 0;">-<span id="LC1791" 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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1792
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<pre style="margin: 0;">-<span id="LC1792" 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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1766
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<pre style="margin: 0;">+<span id="LC1766" 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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1793
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1767
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<pre style="margin: 0;"> <span id="LC1767" class="line" lang="haskell"></span>
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1794
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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;">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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1768
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<pre style="margin: 0;">+<span id="LC1768" 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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1795
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1769
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<pre style="margin: 0;"> <span id="LC1769" class="line" lang="haskell"></span>
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1796
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1770
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<pre style="margin: 0;"> <span id="LC1770" 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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1797
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<pre style="margin: 0;">-<span id="LC1797" 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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1798
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<pre style="margin: 0;">-<span id="LC1798" 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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1771
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<pre style="margin: 0;">+<span id="LC1771" 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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1799
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1772
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<pre style="margin: 0;"> <span id="LC1772" 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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1800
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1773
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<pre style="margin: 0;"> <span id="LC1773" 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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1801
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1774
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<pre style="margin: 0;"> <span id="LC1774" 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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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1806" 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="1779" 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">@@ -1806,7 +1779,7 @@ solveImplication imp@(Implic { ic_tclvl = tclvl</td>
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1806
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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="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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1807
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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;">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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1808
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1781
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<pre style="margin: 0;"> <span id="LC1781" 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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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="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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1782
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<pre style="margin: 0;">+<span id="LC1782" 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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1810
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1783
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<pre style="margin: 0;"> <span id="LC1783" class="line" lang="haskell"></span>
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1811
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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;">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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1812
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1785
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<pre style="margin: 0;"> <span id="LC1785" 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 new_line" data-linenumber="1801" 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">@@ -1828,7 +1801,7 @@ solveImplication imp@(Implic { ic_tclvl = tclvl</td>
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1828
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1801
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<pre style="margin: 0;"> <span id="LC1801" 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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1829
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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;">-- solveWanteds, *not* solveWantedsAndDrop, because</span></span>
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1830
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1803
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<pre style="margin: 0;"> <span id="LC1803" 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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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></span>
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1804
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<pre style="margin: 0;">+<span id="LC1804" 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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1832
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1805
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<pre style="margin: 0;"> <span id="LC1805" class="line" lang="haskell"></span>
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1833
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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="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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1834
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1807
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<pre style="margin: 0;"> <span id="LC1807" 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 old_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="diff-line-num unfold js-unfold new_line" data-linenumber="1810" 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">@@ -1837,10 +1810,6 @@ solveImplication imp@(Implic { ic_tclvl = tclvl</td>
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1837
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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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1838
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1811
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<pre style="margin: 0;"> <span id="LC1811" 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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1839
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1812
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<pre style="margin: 0;"> <span id="LC1812" class="line" lang="haskell"></span>
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1840
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<pre style="margin: 0;">-<span id="LC1840" 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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1841
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<pre style="margin: 0;">-<span id="LC1841" 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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1842
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<pre style="margin: 0;">-<span id="LC1842" 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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1843
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<pre style="margin: 0;">-<span id="LC1843" class="line" lang="haskell"></span>
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1844
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1813
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<pre style="margin: 0;"> <span id="LC1813" 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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1845
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1814
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<pre style="margin: 0;"> <span id="LC1814" 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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1846
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1815
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<pre style="margin: 0;"> <span id="LC1815" 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="diff-line-num unfold js-unfold old_line" data-linenumber="1854" 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="1823" 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">@@ -1854,12 +1823,11 @@ solveImplication imp@(Implic { ic_tclvl = tclvl</td>
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1854
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1823
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<pre style="margin: 0;"> <span id="LC1823" 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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1855
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<td class="diff-line-num new_line" data-linenumber="1824" 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">
1824
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<pre style="margin: 0;"> <span id="LC1824" 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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1856
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<td class="diff-line-num new_line" data-linenumber="1825" 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">
1825
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<pre style="margin: 0;"> <span id="LC1825" 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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1857
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<td class="diff-line-num new_line old" data-linenumber="1826" 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="LC1857" 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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1858
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<td class="diff-line-num new_line" data-linenumber="1826" 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">
1826
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<pre style="margin: 0;"> <span id="LC1826" 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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<td class="diff-line-num old_line" data-linenumber="1859" 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">
1859
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<td class="diff-line-num new_line" data-linenumber="1827" 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">
1827
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<pre style="margin: 0;"> <span id="LC1827" 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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1860
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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;">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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1861
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1829
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<pre style="margin: 0;"> <span id="LC1829" class="line" lang="haskell"></span>
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1862
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<pre style="margin: 0;">-<span id="LC1862" 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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1830
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<pre style="margin: 0;">+<span id="LC1830" 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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1863
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1831
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<pre style="margin: 0;"> <span id="LC1831" class="line" lang="haskell"></span>
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1864
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1832
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<pre style="margin: 0;"> <span id="LC1832" 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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1865
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1833
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<pre style="margin: 0;"> <span id="LC1833" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [TcLevel and untouchable type variables] in GHC.Tc.Utils.TcType),</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2500" 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">@@ -2532,6 +2500,7 @@ no evidence for a fundep equality), but equality superclasses do matter (since</td>
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2532
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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;">they carry evidence).</span></span>
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2533
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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;">-}</span></span>
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2534
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2502
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<pre style="margin: 0;"> <span id="LC2502" class="line" lang="haskell"></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;">{-</span></span>
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2535
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2504
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<pre style="margin: 0;"> <span id="LC2504" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">floatEqualities :: [TcTyVar] -> [EvId] -> EvBindsVar -> HasGivenEqs</span></span>
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2536
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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;"> -> WantedConstraints</span></span>
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2537
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2506
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<pre style="margin: 0;"> <span id="LC2506" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -> TcS (Cts, WantedConstraints)</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">@@ -2553,7 +2522,6 @@ floatEqualities :: [TcTyVar] -> [EvId] -> EvBindsVar -> HasGivenEqs</td>
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2553
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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;">floatEqualities _ _ _ _ wanteds</span></span>
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2554
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2523
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<pre style="margin: 0;"> <span id="LC2523" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = return (emptyBag, wanteds)</span></span>
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2555
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2524
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<pre style="margin: 0;"> <span id="LC2524" 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="cm" style="color: #998; font-style: italic;">{-</span></span>
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2557
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2525
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<pre style="margin: 0;"> <span id="LC2525" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">floatEqualities skols given_ids ev_binds_var has_given_eqs</span></span>
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2558
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2526
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<pre style="margin: 0;"> <span id="LC2526" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> wanteds@(WC { wc_simple = simples })</span></span>
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2559
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2527
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<pre style="margin: 0;"> <span id="LC2527" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | MaybeGivenEqs <- has_given_eqs -- There are some given equalities, so don't float</span></span>
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<li id="f018e77421f495c6f75733fee4a511cfe57bebe8">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d1ff4302a8e92852d90d754f1d2de1ed509d4468#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">@@ -2270,8 +2270,8 @@ canEqCanLHS2 ev eq_rel swapped lhs1 ps_xi1 lhs2 ps_xi2 mco</td>
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<pre style="margin: 0;"> <span id="LC2270" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2271" 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="LC2272" 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="LC2273" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If the tyvar is a <span class="idiff left right">meta-tyvar, 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="LC2274" 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="LC2273" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If the tyvar is a <span class="idiff left right">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="LC2274" 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="LC2275" 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="LC2276" 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="LC2277" 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">@@ -2279,8 +2279,6 @@ canEqCanLHS2 ev eq_rel swapped lhs1 ps_xi1 lhs2 ps_xi2 mco</td>
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<pre style="margin: 0;"> <span id="LC2279" 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="LC2280" 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="LC2281" 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="LC2282" 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="LC2283" 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="LC2282" 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="LC2283" 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="LC2284" 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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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2342,7 +2340,11 @@ unifyTest ev tv1 rhs</td>
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<pre style="margin: 0;"> <span id="LC2340" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2341" 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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<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;">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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<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;">otherwise</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;">-- Coercion variables</span></span>
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<pre style="margin: 0;">+<span id="LC2343" 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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<pre style="margin: 0;">+<span id="LC2344" 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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<pre style="margin: 0;">+<span id="LC2345" 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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<pre style="margin: 0;">+<span id="LC2346" 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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<pre style="margin: 0;">+<span id="LC2347" 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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<pre style="margin: 0;"> <span id="LC2348" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2349" class="line" lang="haskell"> <span class="n" style="color: #333;">is_promotable</span> <span class="n" style="color: #333;">fv</span></span>
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<pre style="margin: 0;"> <span id="LC2350" 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>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d1ff4302a8e92852d90d754f1d2de1ed509d4468#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">@@ -31,7 +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;"><span class="idiff left right">g</span>etUnificationFlag</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="LC34" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left right">res</span>etUnificationFlag</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">@@ -1512,12 +1512,24 @@ addInertForAll new_qci</td>
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<pre style="margin: 0;"> <span id="LC1512" 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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<pre style="margin: 0;"> <span id="LC1513" 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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<pre style="margin: 0;"> <span id="LC1514" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1515" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">C.f add_given_eq</span></span></span>
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<pre style="margin: 0;">+<span id="LC1515" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">Update given equalities. Painful! C.f updateGivenEqs</span></span></span>
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<pre style="margin: 0;"> <span id="LC1516" 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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<pre style="margin: 0;">-<span id="LC1517" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ics2</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;">inert_given_eq_lvl</span> <span class="n" style="color: #333;">ics1</span></span>
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1518
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<pre style="margin: 0;">-<span id="LC1518" class="line" lang="haskell"> <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 class="p">}</span></span>
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1519
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<pre style="margin: 0;">-<span id="LC1519" 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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1520
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<pre style="margin: 0;">-<span id="LC1520" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ics1</span></span>
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<pre style="margin: 0;">+<span id="LC1517" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <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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<pre style="margin: 0;">+<span id="LC1518" 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;">ge_lvl'</span></span>
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<pre style="margin: 0;">+<span id="LC1519" 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;">geqs'</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1520" 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;">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>
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<pre style="margin: 0;">+<span id="LC1521" 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;">geqs</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ics1</span></span>
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<pre style="margin: 0;">+<span id="LC1522" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1523" 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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<pre style="margin: 0;">+<span id="LC1524" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- True <=> definitely not an equality</span></span>
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<pre style="margin: 0;">+<span id="LC1525" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Heads like (f a) might be an equality</span></span>
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<pre style="margin: 0;">+<span id="LC1526" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1527" class="line" lang="haskell"> <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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<pre style="margin: 0;">+<span id="LC1528" class="line" lang="haskell"> <span class="n" style="color: #333;">is_eq_pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isEqPred</span> <span class="n" style="color: #333;">pred</span> <span class="c1" style="color: #998; font-style: italic;">-- Definitely an equality</span></span>
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<pre style="margin: 0;">+<span id="LC1529" class="line" lang="haskell"> <span class="n" style="color: #333;">geqs'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">geqs</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">is_eq_pred</span></span>
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<pre style="margin: 0;">+<span id="LC1530" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1531" 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;">tclvl</span> <span class="p">`</span><span class="n" style="color: #333;">strictlyDeeperThan</span><span class="p">`</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>
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1532
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<pre style="margin: 0;">+<span id="LC1532" 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;">ge_lvl</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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1522
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1534
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<pre style="margin: 0;"> <span id="LC1534" 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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1523
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1535
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<pre style="margin: 0;"> <span id="LC1535" class="line" lang="haskell"> <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">@@ -1602,13 +1614,13 @@ add_item :: TcLevel -> InertCans -> Ct -> InertCans</td>
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1602
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1614
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<pre style="margin: 0;"> <span id="LC1614" 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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1603
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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;">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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1604
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1616
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<pre style="margin: 0;"> <span id="LC1616" 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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1605
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<pre style="margin: 0;">-<span id="LC1605" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left right">add_given_eq</span></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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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="n" style="color: #333;"><span class="idiff left right">updateGivenEqs</span></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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1606
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1618
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<pre style="margin: 0;"> <span id="LC1618" 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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1607
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1619
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<pre style="margin: 0;"> <span id="LC1619" 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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1608
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1620
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<pre style="margin: 0;"> <span id="LC1620" 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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1609
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1621
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<pre style="margin: 0;"> <span id="LC1621" class="line" lang="haskell"></span>
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1610
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1622
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<pre style="margin: 0;"> <span id="LC1622" 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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1611
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<pre style="margin: 0;">-<span id="LC1611" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left right">add_given_eq</span></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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1623
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<pre style="margin: 0;">+<span id="LC1623" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left right">updateGivenEqs</span></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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1612
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1624
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<pre style="margin: 0;"> <span id="LC1624" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- equality, so we play safe</span></span>
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1613
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1625
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<pre style="margin: 0;"> <span id="LC1625" 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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1614
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1626
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<pre style="margin: 0;"> <span id="LC1626" 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">@@ -1619,15 +1631,15 @@ add_item _ _ item</td>
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<pre style="margin: 0;"> <span id="LC1631" 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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1620
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1632
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<pre style="margin: 0;"> <span id="LC1632" 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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1621
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1633
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<pre style="margin: 0;"> <span id="LC1633" class="line" lang="haskell"></span>
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1622
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<pre style="margin: 0;">-<span id="LC1622" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left right">add_given_eq</span></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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1634
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<pre style="margin: 0;">+<span id="LC1634" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left right">updateGivenEqs</span></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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1635
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<pre style="margin: 0;"> <span id="LC1635" 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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1624
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1636
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<pre style="margin: 0;"> <span id="LC1636" 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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1625
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1637
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<pre style="margin: 0;"> <span id="LC1637" 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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1626
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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;">-- See See Note [When does an implication have given equalities?]</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;">--</span></span>
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1628
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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;">-- ToDo: what about Quantified Constraints?</span></span>
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<pre style="margin: 0;">-<span id="LC1629" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left right">add_given_eq</span></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>
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<pre style="margin: 0;">-<span id="LC1630" 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;">geqs</span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC1641" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left right">updateGivenEqs</span></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>
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<pre style="margin: 0;">+<span id="LC1642" class="line" lang="haskell"> <span class="idiff left right"> </span><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;">geqs</span> <span class="p">})</span></span>
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1631
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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;">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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1632
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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="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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1633
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1645
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<pre style="margin: 0;"> <span id="LC1645" 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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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1651,7 +1663,9 @@ add_given_eq tclvl ct inerts@(IC { inert_given_eq_lvl = ge_lvl</td>
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<pre style="margin: 0;"> <span id="LC1663" class="line" lang="haskell"></span>
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1652
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1664
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<pre style="margin: 0;"> <span id="LC1664" 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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1653
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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;">-- True <=> definitely not an equality of any kind</span></span>
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1654
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<pre style="margin: 0;">-<span id="LC1654" 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;">isLocalSkolem</span> <span class="n" style="color: #333;">tclvl</span> <span class="n" style="color: #333;">tv</span></span>
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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;">-- except for a let-bound skolem, which doesn't count</span></span>
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1667
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<pre style="margin: 0;">+<span id="LC1667" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Let-bound skolems]</span></span>
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1668
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<pre style="margin: 0;">+<span id="LC1668" 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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1655
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1669
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<pre style="margin: 0;"> <span id="LC1669" 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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1656
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1670
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<pre style="margin: 0;"> <span id="LC1670" 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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1657
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1671
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<pre style="margin: 0;"> <span id="LC1671" 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">@@ -2184,81 +2198,38 @@ getHasGivenEqs :: TcLevel -- TcLevel of this implication</td>
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2184
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2198
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<pre style="margin: 0;"> <span id="LC2198" 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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2185
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<pre style="margin: 0;"> <span id="LC2199" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [When does an implication have given equalities?]</span></span>
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2186
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<pre style="margin: 0;"> <span id="LC2200" 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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2187
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<pre style="margin: 0;">-<span id="LC2187" 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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2188
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<pre style="margin: 0;">-<span id="LC2188" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- , inert_insts = qc_insts</span></span>
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2189
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<pre style="margin: 0;">-<span id="LC2189" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- , inert_eqs = ieqs, inert_funeqs = funeqs</span></span>
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2190
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<pre style="margin: 0;">-<span id="LC2190" 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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2201
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<pre style="margin: 0;">+<span id="LC2201" 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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2202
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<pre style="margin: 0;">+<span id="LC2202" 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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2191
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2203
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<pre style="margin: 0;"> <span id="LC2203" 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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2192
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2204
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<pre style="margin: 0;"> <span id="LC2204" 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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<pre style="margin: 0;">-<span id="LC2193" 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="LC2194" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; let has_given_eqs = foldMap check_local_given_ct irreds</span></span>
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2195
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<pre style="margin: 0;">-<span id="LC2195" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> S.<> foldMap (lift_equal_ct_list check_local_given_tv_eq) ieqs</span></span>
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2196
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<pre style="margin: 0;">-<span id="LC2196" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> S.<> foldMapFunEqs (lift_equal_ct_list check_local_given_ct) funeqs</span></span>
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2197
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<pre style="margin: 0;">-<span id="LC2197" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> S.<> foldMap qc_eq_inst_given_here qc_insts</span></span>
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2198
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<pre style="margin: 0;">-<span id="LC2198" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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2199
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2205
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<pre style="margin: 0;"> <span id="LC2205" 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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2200
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<pre style="margin: 0;">-<span id="LC2200" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="c1" style="color: #998; font-style: italic;">-- Specifically includes ones that originated in some</span></span>
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2206
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<pre style="margin: 0;">+<span id="LC2206" 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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2201
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2207
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<pre style="margin: 0;"> <span id="LC2207" 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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2202
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2208
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<pre style="margin: 0;"> <span id="LC2208" 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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2209
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<pre style="margin: 0;">+<span id="LC2209" 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;">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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2210
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<pre style="margin: 0;">+<span id="LC2210" class="line" lang="haskell"> <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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2211
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<pre style="margin: 0;">+<span id="LC2211" 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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2212
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<pre style="margin: 0;">+<span id="LC2212" class="line" lang="haskell"></span>
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2203
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2213
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<pre style="margin: 0;"> <span id="LC2213" 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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2204
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2214
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<pre style="margin: 0;"> <span id="LC2214" 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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2205
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2215
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<pre style="margin: 0;"> <span id="LC2215" 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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2206
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2216
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<pre style="margin: 0;"> <span id="LC2216" 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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2207
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2217
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<pre style="margin: 0;"> <span id="LC2217" 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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2208
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<td class="diff-line-num new_line" data-linenumber="2218" 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">
2218
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<pre style="margin: 0;"> <span id="LC2218" 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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2209
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<pre style="margin: 0;">-<span id="LC2209" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">has_ge</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> <span class="kt" style="color: #458; font-weight: 600;">LocalGivenEqs</span></span>
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<pre style="margin: 0;">-<span id="LC2210" class="line" lang="haskell"><span class="cd">-- | ge_lvl == tclvl = MaybeGivenEqs</span></span>
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2211
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<pre style="margin: 0;">-<span id="LC2211" 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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2212
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2219
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<pre style="margin: 0;"> <span id="LC2219" 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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2213
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<pre style="margin: 0;">-<span id="LC2213" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2214
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<pre style="margin: 0;">-<span id="LC2214" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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2215
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<pre style="margin: 0;">-<span id="LC2215" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> check_local_given_ct :: Ct -> HasGivenEqs</span></span>
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2216
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<pre style="margin: 0;">-<span id="LC2216" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> check_local_given_ct ct = check_local_given_ev (ctEvidence ct)</span></span>
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<pre style="margin: 0;">-<span id="LC2217" class="line" lang="haskell"></span>
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2218
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<pre style="margin: 0;">-<span id="LC2218" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> check_local_given_ev :: CtEvidence -> HasGivenEqs</span></span>
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2219
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<pre style="margin: 0;">-<span id="LC2219" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> check_local_given_ev ev</span></span>
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2220
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<pre style="margin: 0;">-<span id="LC2220" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | not (given_bound_here ev) = NoGivenEqs</span></span>
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2221
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<pre style="margin: 0;">-<span id="LC2221" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | mentionsOuterVar tclvl ev = MaybeGivenEqs</span></span>
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2222
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<pre style="margin: 0;">-<span id="LC2222" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | otherwise = LocalGivenEqs</span></span>
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2223
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<pre style="margin: 0;">-<span id="LC2223" class="line" lang="haskell"></span>
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2224
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<pre style="margin: 0;">-<span id="LC2224" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> lift_equal_ct_list :: (Ct -> HasGivenEqs) -> EqualCtList -> HasGivenEqs</span></span>
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2225
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<pre style="margin: 0;">-<span id="LC2225" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- returns NoGivenEqs for non-singleton lists, as Given lists are always</span></span>
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2226
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<pre style="margin: 0;">-<span id="LC2226" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- singletons</span></span>
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2227
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<pre style="margin: 0;">-<span id="LC2227" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> lift_equal_ct_list check (EqualCtList (ct :| [])) = check ct</span></span>
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2228
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<pre style="margin: 0;">-<span id="LC2228" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> lift_equal_ct_list _ _ = NoGivenEqs</span></span>
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2229
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<pre style="margin: 0;">-<span id="LC2229" class="line" lang="haskell"></span>
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2230
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<pre style="margin: 0;">-<span id="LC2230" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> check_local_given_tv_eq :: Ct -> HasGivenEqs</span></span>
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2231
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<pre style="margin: 0;">-<span id="LC2231" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> check_local_given_tv_eq (CEqCan { cc_lhs = TyVarLHS tv, cc_ev = ev})</span></span>
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2232
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<pre style="margin: 0;">-<span id="LC2232" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | not (given_bound_here ev) = NoGivenEqs</span></span>
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2233
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<pre style="margin: 0;">-<span id="LC2233" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | not (isLocalSkolem tclvl tv) = MaybeGivenEqs</span></span>
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<pre style="margin: 0;">-<span id="LC2234" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | otherwise = NoGivenEqs -- See Note [Let-bound skolems]</span></span>
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<pre style="margin: 0;">-<span id="LC2235" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> check_local_given_tv_eq other_ct</span></span>
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<pre style="margin: 0;">-<span id="LC2236" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = check_local_given_ct other_ct</span></span>
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<pre style="margin: 0;">-<span id="LC2237" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2238" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> qc_eq_inst_given_here :: QCInst -> HasGivenEqs</span></span>
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2239
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<pre style="margin: 0;">-<span id="LC2239" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- True of a quantified constraint (which are always Given)</span></span>
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2240
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<pre style="margin: 0;">-<span id="LC2240" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- for an equality, bound by this implication</span></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;"> qc_eq_inst_given_here (QCI { qci_ev = ev, qci_pred = pred })</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;"> | isEqPred pred = check_local_given_ev ev</span></span>
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<pre style="margin: 0;">-<span id="LC2243" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | otherwise = NoGivenEqs</span></span>
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<pre style="margin: 0;">-<span id="LC2244" class="line" lang="haskell"></span>
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2245
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<pre style="margin: 0;">-<span id="LC2245" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> given_bound_here :: CtEvidence -> Bool</span></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;"> -- True for a Given bound by the current implication,</span></span>
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<pre style="margin: 0;">-<span id="LC2247" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- i.e. the current level</span></span>
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<pre style="margin: 0;">-<span id="LC2248" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> given_bound_here ev = isGiven ev</span></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;"> && tclvl == ctLocLevel (ctEvLoc ev)</span></span>
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<pre style="margin: 0;">-<span id="LC2250" 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="LC2220" class="line" lang="haskell"></span>
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2252
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2221
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<pre style="margin: 0;"> <span id="LC2221" 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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2222
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<pre style="margin: 0;"> <span id="LC2222" 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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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="n" style="color: #333;">anyFreeVarsOfType</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">not</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">isLocalSkolem</span></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="LC2223" 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;"><span class="idiff left right">isOuterTyVar</span></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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2255
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<pre style="margin: 0;"> <span id="LC2224" 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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2256
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2225
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<pre style="margin: 0;"> <span id="LC2225" class="line" lang="haskell"></span>
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2257
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<pre style="margin: 0;">-<span id="LC2257" class="line" lang="haskell"><span class="n" style="color: #333;">isLocalSkolem</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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2258
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<pre style="margin: 0;">-<span id="LC2258" class="line" lang="haskell"><span class="n" style="color: #333;">isLocalSkolem</span> <span class="n" style="color: #333;">tclvl</span> <span class="n" style="color: #333;">tv</span></span>
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2259
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<pre style="margin: 0;">-<span id="LC2259" 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;">sameDepthAs</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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2260
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<pre style="margin: 0;">-<span id="LC2260" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Includes CycleBreakerTvs which are meta-tyvars</span></span>
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2261
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<pre style="margin: 0;">-<span id="LC2261" 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 class="c1" style="color: #998; font-style: italic;">-- Coercion variables; doesn't much matter</span></span>
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2226
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<pre style="margin: 0;">+<span id="LC2226" 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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2227
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<pre style="margin: 0;">+<span id="LC2227" 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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2228
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<pre style="margin: 0;">+<span id="LC2228" 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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2229
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<pre style="margin: 0;">+<span id="LC2229" 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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<pre style="margin: 0;">+<span id="LC2230" 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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<pre style="margin: 0;">+<span id="LC2231" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Includes CycleBreakerTvs which are meta-tyvars</span></span>
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<pre style="margin: 0;">+<span id="LC2232" 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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<pre style="margin: 0;"> <span id="LC2233" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2234" class="line" lang="haskell"><span class="cd">-- | Returns Given constraints that might,</span></span>
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2235
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<pre style="margin: 0;"> <span id="LC2235" 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">@@ -2926,16 +2897,16 @@ bumpStepCountTcS = TcS $ \env -> do { let ref = tcs_count env</td>
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2926
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2897
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<pre style="margin: 0;"> <span id="LC2897" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">n</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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2927
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2898
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<pre style="margin: 0;"> <span id="LC2898" 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;">writeTcRef</span> <span class="n" style="color: #333;">ref</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="p">}</span></span>
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2899
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<pre style="margin: 0;"> <span id="LC2899" class="line" lang="haskell"></span>
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2929
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<pre style="margin: 0;">-<span id="LC2929" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left right">g</span>etUnificationFlag</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="LC2900" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left right">res</span>etUnificationFlag</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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2901
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<pre style="margin: 0;"> <span id="LC2901" 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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<pre style="margin: 0;">-<span id="LC2931" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If the unification flag = Just i, set it to Nothing and return True</span></span>
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<pre style="margin: 0;">-<span id="LC2932" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Otherwise return False</span></span>
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<pre style="margin: 0;">-<span id="LC2933" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left right">g</span>etUnificationFlag</span></span>
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<pre style="margin: 0;">+<span id="LC2902" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If the unification flag = Just i, <span class="idiff left right">re</span>set it to Nothing and return True</span></span>
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<pre style="margin: 0;">+<span id="LC2903" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Otherwise <span class="idiff left right">leave it unchanged and </span>return False</span></span>
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<pre style="margin: 0;">+<span id="LC2904" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left right">res</span>etUnificationFlag</span></span>
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2905
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<pre style="margin: 0;"> <span id="LC2905" 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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2935
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2906
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<pre style="margin: 0;"> <span id="LC2906" 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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2907
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<pre style="margin: 0;"> <span id="LC2907" 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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2937
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2908
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<pre style="margin: 0;"> <span id="LC2908" 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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2938
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<pre style="margin: 0;">-<span id="LC2938" 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;">"<span class="idiff left right">g</span>etUnificationFlag"</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC2909" 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;">"<span class="idiff left right">res</span>etUnificationFlag"</span> <span class="o" style="font-weight: 600;">$</span></span>
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2939
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2910
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<pre style="margin: 0;"> <span id="LC2910" 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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<pre style="margin: 0;"> <span id="LC2911" 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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2912
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<pre style="margin: 0;"> <span id="LC2912" 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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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d1ff4302a8e92852d90d754f1d2de1ed509d4468#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 right"> </span><span class="nf" style="color: #900; font-weight: 600;">occCheckForErrors</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">MetaTyVarUpdateResult</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;">occCheckForErrors</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">MetaTyVarUpdateResult</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="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">@@ -1435,9 +1435,9 @@ uUnfilledVar2 origin t_or_k swapped tv1 ty2</td>
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1435
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<pre style="margin: 0;"> <span id="LC1435" 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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1436
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1436
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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;">isTouchableMetaTyVar</span> <span class="n" style="color: #333;">cur_lvl</span> <span class="n" style="color: #333;">tv1</span></span>
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1437
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1437
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<pre style="margin: 0;"> <span id="LC1437" 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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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;"><span class="idiff left">ty2'</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">metaTyVarUpdateOK</span></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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<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="p"><span class="idiff left">{}</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">checkTyVarEq</span></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="c1" style="color: #998; font-style: italic;">-- See Note [Prevent unification with type families] about the NoTypeFamilies:</span></span>
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<pre style="margin: 0;">-<span id="LC1440" 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 class="idiff left right">'</span></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="LC1440" 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="LC1441" 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="LC1442" 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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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;">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">@@ -1447,8 +1447,8 @@ uUnfilledVar2 origin t_or_k swapped tv1 ty2</td>
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1447
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<pre style="margin: 0;"> <span id="LC1447" 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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<pre style="margin: 0;"> <span id="LC1448" 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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<pre style="margin: 0;"> <span id="LC1449" 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="LC1450" 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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1451
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<pre style="margin: 0;">-<span id="LC1451" 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="LC1450" 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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<pre style="margin: 0;">+<span id="LC1451" 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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<pre style="margin: 0;"> <span id="LC1452" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1453" 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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<pre style="margin: 0;"> <span id="LC1454" 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">@@ -1912,73 +1912,6 @@ instance Outputable AreTypeFamiliesOK where</td>
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<pre style="margin: 0;"> <span id="LC1912" 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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<pre style="margin: 0;"> <span id="LC1913" 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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1914
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<pre style="margin: 0;"> <span id="LC1914" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1915" 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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<pre style="margin: 0;">-<span id="LC1916" 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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<pre style="margin: 0;">-<span id="LC1917" 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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1918
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<pre style="margin: 0;">-<span id="LC1918" 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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1919
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<pre style="margin: 0;">-<span id="LC1919" 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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1920
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<pre style="margin: 0;">-<span id="LC1920" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (metaTyVarUpdateOK tv ty)</span></span>
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<pre style="margin: 0;">-<span id="LC1921" 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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<pre style="margin: 0;">-<span id="LC1922" 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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1923
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<pre style="margin: 0;">-<span id="LC1923" 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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<pre style="margin: 0;">-<span id="LC1924" 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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<pre style="margin: 0;">-<span id="LC1925" 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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1926
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<pre style="margin: 0;">-<span id="LC1926" 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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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;">--</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;">-- Used in two places:</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;">-- - In the eager unifier: uUnfilledVar2</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;">-- - In the canonicaliser: GHC.Tc.Solver.Canonical.canEqTyVar2</span></span>
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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;">-- Note that in the latter case tv is not necessarily a meta-tyvar,</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;">-- despite the name of this function.</span></span>
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1933
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<pre style="margin: 0;">-<span id="LC1933" class="line" lang="haskell"></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;">-- We have two possible outcomes:</span></span>
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1935
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<td class="diff-line-num new_line old" data-linenumber="1915" 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;">-- (1) Return the type to update the type variable with,</span></span>
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1936
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<td class="diff-line-num new_line old" data-linenumber="1915" 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;">-- [we know the update is ok]</span></span>
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1937
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<pre style="margin: 0;">-<span id="LC1937" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (2) Return Nothing,</span></span>
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1938
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<pre style="margin: 0;">-<span id="LC1938" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- [the update might be dodgy]</span></span>
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1939
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<pre style="margin: 0;">-<span id="LC1939" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1940
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<pre style="margin: 0;">-<span id="LC1940" 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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1941
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<pre style="margin: 0;">-<span id="LC1941" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- type family F a</span></span>
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1942
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<pre style="margin: 0;">-<span id="LC1942" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- type instance F Int = Int</span></span>
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1943
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<pre style="margin: 0;">-<span id="LC1943" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- consider</span></span>
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1944
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<pre style="margin: 0;">-<span id="LC1944" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- a ~ F a</span></span>
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1945
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<td class="diff-line-num new_line old" data-linenumber="1915" 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;">-- This is perfectly reasonable, if we later get a ~ Int. For now, though,</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;">-- we return Nothing, leaving it to the later constraint simplifier to</span></span>
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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;">-- sort matters out.</span></span>
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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;">--</span></span>
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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;">-- See Note [Refactoring hazard: metaTyVarUpdateOK]</span></span>
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1950
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<pre style="margin: 0;">-<span id="LC1950" class="line" lang="haskell"></span>
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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;">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;">rhs_ty</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1952" 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">
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="n" style="color: #333;">ty_fam_ok</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1953
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<pre style="margin: 0;">-<span id="LC1953" 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;">bad_tyvar_tv</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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<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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<pre style="margin: 0;">-<span id="LC1954" 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;">rhs_ty</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;">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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<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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<pre style="margin: 0;">-<span id="LC1956" 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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<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 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;">rhs_ty</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1958
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<pre style="margin: 0;">-<span id="LC1958" 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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1959
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<pre style="margin: 0;">-<span id="LC1959" 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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1960
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<pre style="margin: 0;">-<span id="LC1960" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1961
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<pre style="margin: 0;">-<span id="LC1961" class="line" lang="haskell"> <span class="n" style="color: #333;">bad_tyvar_tv</span><span class="p">,</span> <span class="n" style="color: #333;">bad_rhs</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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1962
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<pre style="margin: 0;">-<span id="LC1962" class="line" lang="haskell"></span>
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1963
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<pre style="margin: 0;">-<span id="LC1963" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- True <=> we have alpha ~ ty, where alpha is a TyVarTv</span></span>
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1964
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<pre style="margin: 0;">-<span id="LC1964" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- and ty is not a tyvar</span></span>
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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;">bad_tyvar_tv</span> <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;">TyVarTv</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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1966
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<pre style="margin: 0;">-<span id="LC1966" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bad_rhs</span></span>
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1967
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<pre style="margin: 0;">-<span id="LC1967" 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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1968
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<pre style="margin: 0;">-<span id="LC1968" 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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1969
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<pre style="margin: 0;">-<span id="LC1969" class="line" lang="haskell"></span>
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<td class="diff-line-num old old_line" data-linenumber="1970" 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">
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;">-- True <=> RHS is not a tyvar, or</span></span>
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1971
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<pre style="margin: 0;">-<span id="LC1971" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (if a unification variable) is not a TyVarTv</span></span>
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1972
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<pre style="margin: 0;">-<span id="LC1972" class="line" lang="haskell"> <span class="n" style="color: #333;">bad_rhs</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;">rhs_ty</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1973
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<pre style="margin: 0;">-<span id="LC1973" 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;">True</span></span>
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1974
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<pre style="margin: 0;">-<span id="LC1974" 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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1975
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<pre style="margin: 0;">-<span id="LC1975" 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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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="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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1977
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<pre style="margin: 0;">-<span id="LC1977" 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;">False</span></span>
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1978
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<pre style="margin: 0;">-<span id="LC1978" 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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1979
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<pre style="margin: 0;">-<span id="LC1979" 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;">False</span></span>
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1980
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<pre style="margin: 0;">-<span id="LC1980" 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;">False</span></span>
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1981
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<pre style="margin: 0;">-<span id="LC1981" class="line" lang="haskell"></span>
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1982
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1915
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<pre style="margin: 0;"> <span id="LC1915" 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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1983
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1916
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<pre style="margin: 0;"> <span id="LC1916" 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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1984
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1917
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<pre style="margin: 0;"> <span id="LC1917" 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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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2002" 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="1935" 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">@@ -2002,6 +1935,14 @@ checkTypeEq :: DynFlags -> AreTypeFamiliesOK -> CanEqLHS -> TcType</td>
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2002
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1935
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<pre style="margin: 0;"> <span id="LC1935" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (d) a blocking coercion hole</span></span>
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2003
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1936
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<pre style="margin: 0;"> <span id="LC1936" 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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2004
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1937
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<pre style="margin: 0;"> <span id="LC1937" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1938
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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 an occurs-check does not mean "definite error". For example</span></span>
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1939
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<pre style="margin: 0;">+<span id="LC1939" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- type family F a</span></span>
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1940
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<pre style="margin: 0;">+<span id="LC1940" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- type instance F Int = Int</span></span>
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1941
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<pre style="margin: 0;">+<span id="LC1941" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- consider</span></span>
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1942
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<pre style="margin: 0;">+<span id="LC1942" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- b0 ~ F b0</span></span>
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1943
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<pre style="margin: 0;">+<span id="LC1943" 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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1944
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<pre style="margin: 0;">+<span id="LC1944" 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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1945
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<pre style="margin: 0;">+<span id="LC1945" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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2005
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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;">-- For (a), (b), and (c) we check only the top level of the type, NOT</span></span>
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2006
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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;">-- inside the kinds of variables it mentions. For (d) we look deeply</span></span>
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2007
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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;">-- in coercions when the LHS is a tyvar (but skip coercions for type family</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2009" 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="1950" 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">@@ -2009,7 +1950,7 @@ checkTypeEq :: DynFlags -> AreTypeFamiliesOK -> CanEqLHS -> TcType</td>
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2009
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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;">--</span></span>
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2010
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1951
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<pre style="margin: 0;"> <span id="LC1951" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- checkTypeEq is called from</span></span>
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2011
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1952
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<pre style="margin: 0;"> <span id="LC1952" 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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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;">-- case-analysis on 'lhs'</span></span>
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1953
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<pre style="margin: 0;">+<span id="LC1953" 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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2013
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1954
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<pre style="margin: 0;"> <span id="LC1954" 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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2014
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1955
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<pre style="margin: 0;"> <span id="LC1955" 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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2015
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1956
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<pre style="margin: 0;"> <span id="LC1956" 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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