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<h3>
Richard Eisenberg pushed to branch wip/cfuneqcan-refactor
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/0b4d386cc779db18e9fdb266cf76bff341fb126a">0b4d386c</a></strong>
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<span>by Richard Eisenberg</span>
<i>at 2020-11-12T17:13:46-05:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">More reactions to reviews
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<h4>7 changed files:</h4>
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<a href="#84c9d3ba34173297e7d7747e02caa2e004b164fc">
compiler/GHC/Core/Type.hs
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<li class="file-stats">
<a href="#c8a27621f82549165d8946ae8e9f467660958059">
compiler/GHC/HsToCore/Monad.hs
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<li class="file-stats">
<a href="#54436e21ea530a66a8a71bcc01c836f4740b8f02">
compiler/GHC/Tc/Solver.hs
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<li class="file-stats">
<a href="#f018e77421f495c6f75733fee4a511cfe57bebe8">
compiler/GHC/Tc/Solver/Canonical.hs
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<a href="#3b6d78a50c8462304f843b952a88e531718dbbd2">
compiler/GHC/Tc/Types/Constraint.hs
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<a href="#5461e7beeb7ae73d7c01f720cbaa3fa2c5333590">
compiler/GHC/Tc/Utils/TcType.hs
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<a href="#74295edeac870ee7f2f3484ebaffab5c948b735a">
compiler/GHC/Tc/Utils/Unify.hs
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<h4>Changes:</h4>
<li id="84c9d3ba34173297e7d7747e02caa2e004b164fc">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0b4d386cc779db18e9fdb266cf76bff341fb126a#84c9d3ba34173297e7d7747e02caa2e004b164fc"><strong>compiler/GHC/Core/Type.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">@@ -1344,6 +1344,9 @@ splitTyConApp_maybe = repSplitTyConApp_maybe . coreFullView</td>
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<pre style="margin: 0;"> <span id="LC1344" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- of @a@ isn't of the form @TYPE rep@). Consequently, you may need to zonk your</span></span>
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<pre style="margin: 0;"> <span id="LC1345" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- type before using this function.</span></span>
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<pre style="margin: 0;"> <span id="LC1346" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC1347" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This does *not* split types headed with (=>), as that's not a TyCon in the</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1348" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC1348" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- type-checker.</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1349" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC1349" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;"> <span id="LC1350" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If you only need the 'TyCon', consider using 'tcTyConAppTyCon_maybe'.</span></span>
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<pre style="margin: 0;"> <span id="LC1351" class="line" lang="haskell"><span class="n" style="color: #333;">tcSplitTyConApp_maybe</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HasCallStack</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyCon</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">])</span></span>
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<pre style="margin: 0;"> <span id="LC1352" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Defined here to avoid module loops between Unify and TcType.</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0b4d386cc779db18e9fdb266cf76bff341fb126a#c8a27621f82549165d8946ae8e9f467660958059"><strong>compiler/GHC/HsToCore/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">@@ -300,7 +300,11 @@ initTcDsForSolver thing_inside</td>
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<pre style="margin: 0;"> <span id="LC300" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="kt" style="color: #458; font-weight: 600;">DsGblEnv</span> <span class="p">{</span> <span class="n" style="color: #333;">ds_mod</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mod</span></span>
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<pre style="margin: 0;"> <span id="LC301" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ds_fam_inst_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fam_inst_env</span></span>
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<pre style="margin: 0;"> <span id="LC302" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ds_gbl_rdr_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rdr_env</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">gbl</span></span>
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<pre style="margin: 0;">-<span id="LC303" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- this is *the* use of ds_gbl_rdr_env</span></span>
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<pre style="margin: 0;">+<span id="LC303" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This is *the* use of ds_gbl_rdr_env:</span></span>
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<pre style="margin: 0;">+<span id="LC304" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Make sure the solver (used by the pattern-match overlap checker) has</span></span>
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<pre style="margin: 0;">+<span id="LC305" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- access to the GlobalRdrEnv and FamInstEnv for the module, so that it</span></span>
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<pre style="margin: 0;">+<span id="LC306" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- knows how to reduce type families, and which newtypes it can unwrap.</span></span>
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<pre style="margin: 0;"> <span id="LC308" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC309" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DsLclEnv</span> <span class="p">{</span> <span class="n" style="color: #333;">dsl_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">loc</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lcl</span></span>
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310
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<pre style="margin: 0;"> <span id="LC310" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0b4d386cc779db18e9fdb266cf76bff341fb126a#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">@@ -2050,9 +2050,7 @@ simplifyHoles = mapBagM simpl_hole</td>
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<pre style="margin: 0;"> <span id="LC2050" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2051
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<pre style="margin: 0;"> <span id="LC2051" class="line" lang="haskell"> <span class="n" style="color: #333;">simpl_hole</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Hole</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;">Hole</span></span>
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<pre style="margin: 0;"> <span id="LC2052" class="line" lang="haskell"></span>
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2053
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<pre style="margin: 0;">-<span id="LC2053" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- do not simplify an extra-constraints wildcard. These holes</span></span>
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<pre style="margin: 0;">-<span id="LC2054" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- are filled with already-simplified constraints in</span></span>
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<pre style="margin: 0;">-<span id="LC2055" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- chooseInferredQuantifiers (choose_psig_context)</span></span>
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<pre style="margin: 0;">+<span id="LC2053" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Do not simplify ConstraintHoles]</span></span>
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<pre style="margin: 0;"> <span id="LC2054" class="line" lang="haskell"> <span class="n" style="color: #333;">simpl_hole</span> <span class="n" style="color: #333;">h</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Hole</span> <span class="p">{</span> <span class="n" style="color: #333;">hole_sort</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ConstraintHole</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">h</span></span>
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2057
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<pre style="margin: 0;"> <span id="LC2055" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2056" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- other wildcards should be simplified for printing</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">@@ -2102,6 +2100,41 @@ test T12227.</td>
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<pre style="margin: 0;"> <span id="LC2100" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But we don't get to discard all redundant equality superclasses, alas;</span></span>
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<pre style="margin: 0;"> <span id="LC2101" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">see #15205.</span></span>
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<pre style="margin: 0;"> <span id="LC2102" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2103" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Do not simplify ConstraintHoles]</span></span>
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<pre style="margin: 0;">+<span id="LC2104" 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="LC2105" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Before printing the inferred value for a type hole (a _ wildcard in</span></span>
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<pre style="margin: 0;">+<span id="LC2106" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">a partial type signature), we simplify it w.r.t. any Givens. This</span></span>
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<pre style="margin: 0;">+<span id="LC2107" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">makes for an easier-to-understand diagnostic for the user.</span></span>
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2108
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<pre style="margin: 0;">+<span id="LC2108" class="line" lang="haskell"></span>
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2109
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<pre style="margin: 0;">+<span id="LC2109" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">However, we do not wish to do this for extra-constraint holes. Here is</span></span>
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2110
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<pre style="margin: 0;">+<span id="LC2110" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the example for why (partial-sigs/should_compile/T12844):</span></span>
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2111
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<pre style="margin: 0;">+<span id="LC2111" class="line" lang="haskell"></span>
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2112
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<pre style="margin: 0;">+<span id="LC2112" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> bar :: _ => FooData rngs</span></span>
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2113
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<pre style="margin: 0;">+<span id="LC2113" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> bar = foo</span></span>
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2114
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<pre style="margin: 0;">+<span id="LC2114" class="line" lang="haskell"></span>
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2115
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<pre style="margin: 0;">+<span id="LC2115" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data FooData rngs</span></span>
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2116
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<pre style="margin: 0;">+<span id="LC2116" class="line" lang="haskell"></span>
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2117
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<pre style="margin: 0;">+<span id="LC2117" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> class Foo xs where foo :: (Head xs ~ '(r,r')) => FooData xs</span></span>
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2118
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<pre style="margin: 0;">+<span id="LC2118" class="line" lang="haskell"></span>
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2119
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<pre style="margin: 0;">+<span id="LC2119" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type family Head (xs :: [k]) where Head (x ': xs) = x</span></span>
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2120
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<pre style="margin: 0;">+<span id="LC2120" class="line" lang="haskell"></span>
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2121
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<pre style="margin: 0;">+<span id="LC2121" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC correctly infers that the extra-constraints wildcard on `bar`</span></span>
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2122
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<pre style="margin: 0;">+<span id="LC2122" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">should be (Head rngs ~ '(r, r'), Foo rngs). It then adds this constraint</span></span>
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2123
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<pre style="margin: 0;">+<span id="LC2123" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">as a Given on the implication constraint for `bar`. The Hole for</span></span>
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2124
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<pre style="margin: 0;">+<span id="LC2124" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the _ is stored within the implication's WantedConstraints.</span></span>
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2125
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<pre style="margin: 0;">+<span id="LC2125" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">When simplifyHoles is called, that constraint is already assumed as</span></span>
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2126
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<pre style="margin: 0;">+<span id="LC2126" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">a Given. Simplifying with respect to it turns it into</span></span>
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2127
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<pre style="margin: 0;">+<span id="LC2127" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">('(r, r') ~ '(r, r'), Foo rngs), which is disastrous.</span></span>
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2128
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<pre style="margin: 0;">+<span id="LC2128" class="line" lang="haskell"></span>
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2129
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<pre style="margin: 0;">+<span id="LC2129" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Furthermore, there is no need to simplify here: extra-constraints wildcards</span></span>
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2130
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<pre style="margin: 0;">+<span id="LC2130" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">are filled in with the output of the solver, in chooseInferredQuantifiers</span></span>
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2131
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<pre style="margin: 0;">+<span id="LC2131" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(choose_psig_context), so they are already simplified. (Contrast to normal</span></span>
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2132
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<pre style="margin: 0;">+<span id="LC2132" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">type holes, which are just bound to a meta-variable.) Avoiding the poor output</span></span>
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2133
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<pre style="margin: 0;">+<span id="LC2133" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is simple: just don't simplify extra-constraints wildcards.</span></span>
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2134
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<pre style="margin: 0;">+<span id="LC2134" class="line" lang="haskell"></span>
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2135
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<pre style="margin: 0;">+<span id="LC2135" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This is the only reason we need to track ConstraintHole separately</span></span>
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2136
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<pre style="margin: 0;">+<span id="LC2136" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">from TypeHole in HoleSort.</span></span>
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2137
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<pre style="margin: 0;">+<span id="LC2137" class="line" lang="haskell"></span>
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2105
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2138
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<pre style="margin: 0;"> <span id="LC2138" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Tracking redundant constraints]</span></span>
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2106
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2139
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<pre style="margin: 0;"> <span id="LC2139" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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2107
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2140
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<pre style="margin: 0;"> <span id="LC2140" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">With Opt_WarnRedundantConstraints, GHC can report which</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0b4d386cc779db18e9fdb266cf76bff341fb126a#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">@@ -2312,8 +2312,6 @@ canEqCanLHSFinish ev eq_rel swapped lhs rhs</td>
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2312
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<pre style="margin: 0;"> <span id="LC2312" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- guaranteed that tyVarKind lhs == typeKind rhs, for (TyEq:K)</span></span>
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2313
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2313
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<pre style="margin: 0;"> <span id="LC2313" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (TyEq:N) is checked in can_eq_nc', and (TyEq:TV) is handled in canEqTyVarHomo</span></span>
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2314
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2314
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<pre style="margin: 0;"> <span id="LC2314" class="line" lang="haskell"></span>
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2315
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<pre style="margin: 0;">-<span id="LC2315" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- this next line checks also for coercion holes; see</span></span>
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2316
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<pre style="margin: 0;">-<span id="LC2316" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Equalities with incompatible kinds]</span></span>
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2317
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2315
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<pre style="margin: 0;"> <span id="LC2315" 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;">dflags</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getDynFlags</span></span>
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2318
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2316
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<pre style="margin: 0;"> <span id="LC2316" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">new_ev</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rewriteEqEvidence</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">swapped</span> <span class="n" style="color: #333;">lhs_ty</span> <span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">rewrite_co1</span> <span class="n" style="color: #333;">rewrite_co2</span></span>
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2319
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2317
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<pre style="margin: 0;"> <span id="LC2317" 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">@@ -2321,6 +2319,8 @@ canEqCanLHSFinish ev eq_rel swapped lhs rhs</td>
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2321
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2319
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<pre style="margin: 0;"> <span id="LC2319" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- equalities, in case have x ~ (y :: ..x...)</span></span>
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2322
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2320
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<pre style="margin: 0;"> <span id="LC2320" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- #12593</span></span>
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2323
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2321
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<pre style="margin: 0;"> <span id="LC2321" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- guarantees (TyEq:OC), (TyEq:F), and (TyEq:H)</span></span>
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2322
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<pre style="margin: 0;">+<span id="LC2322" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- this next line checks also for coercion holes (TyEq:H); see</span></span>
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<pre style="margin: 0;">+<span id="LC2323" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Equalities with incompatible kinds]</span></span>
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<pre style="margin: 0;"> <span id="LC2324" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">canEqOK</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">eq_rel</span> <span class="n" style="color: #333;">lhs</span> <span class="n" style="color: #333;">rhs</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC2325" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CanEqOK</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;"> <span id="LC2326" class="line" lang="haskell"> <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;">"canEqOK"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">lhs</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">rhs</span><span 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">@@ -2692,6 +2692,10 @@ Note that</td>
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<pre style="margin: 0;"> <span id="LC2692" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* We track the cycle-breaker variables in inert_cycle_breakers in InertSet</span></span>
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<pre style="margin: 0;"> <span id="LC2693" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* We eventually fill in the cycle-breakers, with `cbv := F a`.</span></span>
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<pre style="margin: 0;"> <span id="LC2694" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> No one else fills in cycle-breakers!</span></span>
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<pre style="margin: 0;">+<span id="LC2695" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* In inert_cycle_breakers, we remember the (cbv, F a) pair; that is, we</span></span>
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<pre style="margin: 0;">+<span id="LC2696" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> remember the /original/ type. The [G] F a ~ cbv constraint may be rewritten</span></span>
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<pre style="margin: 0;">+<span id="LC2697" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> by other givens (eg if we have another [G] a ~ (b,c), but at the end we</span></span>
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<pre style="margin: 0;">+<span id="LC2698" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> still fill in with cbv := F a</span></span>
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<pre style="margin: 0;"> <span id="LC2699" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* This fill-in is done when solving is complete, by restoreTyVarCycles</span></span>
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<pre style="margin: 0;"> <span id="LC2700" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in nestImplicTcS and runTcSWithEvBinds.</span></span>
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<pre style="margin: 0;"> <span id="LC2701" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* The evidence for the new `F a ~ cbv` constraint is Refl, because we know this fill-in is</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2738,6 +2742,8 @@ Details:</td>
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<pre style="margin: 0;"> <span id="LC2742" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2743" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (2) Our goal here is to avoid loops in rewriting. We can thus skip looking</span></span>
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<pre style="margin: 0;"> <span id="LC2744" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in coercions, as we don't rewrite in coercions.</span></span>
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<pre style="margin: 0;">+<span id="LC2745" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (There is no worry about unifying a meta-variable here: this Note is</span></span>
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<pre style="margin: 0;">+<span id="LC2746" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> only about Givens.)</span></span>
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<pre style="margin: 0;"> <span id="LC2747" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2748" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (3) As we're substituting, we can build ill-kinded</span></span>
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<pre style="margin: 0;"> <span id="LC2749" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> types. For example, if we have Proxy (F a) b, where (b :: F a), then</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">@@ -2820,6 +2826,10 @@ Details:</td>
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2820
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2826
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<pre style="margin: 0;"> <span id="LC2826" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> we only want to break cycles for user-written loopy Givens, and</span></span>
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2821
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2827
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<pre style="margin: 0;"> <span id="LC2827" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a CycleBreakerTv certainly isn't user-written.</span></span>
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2822
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2828
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<pre style="margin: 0;"> <span id="LC2828" class="line" lang="haskell"></span>
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2829
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<pre style="margin: 0;">+<span id="LC2829" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">NB: This same situation (an equality like b ~ Maybe (F b)) can arise with</span></span>
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2830
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<pre style="margin: 0;">+<span id="LC2830" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Wanteds, but we have no concrete case incentivising special treatment. It</span></span>
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2831
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<pre style="margin: 0;">+<span id="LC2831" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">would just be a CIrredCan.</span></span>
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2832
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<pre style="margin: 0;">+<span id="LC2832" class="line" lang="haskell"></span>
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2833
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<pre style="margin: 0;"> <span id="LC2833" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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2834
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<pre style="margin: 0;"> <span id="LC2834" class="line" lang="haskell"></span>
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2825
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2835
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<pre style="margin: 0;"> <span id="LC2835" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0b4d386cc779db18e9fdb266cf76bff341fb126a#3b6d78a50c8462304f843b952a88e531718dbbd2"><strong>compiler/GHC/Tc/Types/Constraint.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -273,7 +273,8 @@ data HoleSort = ExprHole Id</td>
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<pre style="margin: 0;"> <span id="LC273" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ConstraintHole</span></span>
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<pre style="margin: 0;"> <span id="LC274" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ A hole in a constraint, like @f :: (_, Eq a) => ...</span></span>
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<pre style="margin: 0;"> <span id="LC275" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Differentiated from TypeHole because a ConstraintHole</span></span>
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<pre style="margin: 0;">-<span id="LC276" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- is simplified differently. See GHC.Tc.Solver.simplifyHoles.</span></span>
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<pre style="margin: 0;">+<span id="LC276" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- is simplified differently. See</span></span>
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<pre style="margin: 0;">+<span id="LC277" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Do not simplify ConstraintHoles] in GHC.Tc.Solver.</span></span>
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<pre style="margin: 0;"> <span id="LC278" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC279" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">Hole</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC280" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Hole</span> <span class="p">{</span> <span class="n" style="color: #333;">hole_sort</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ExprHole</span> <span class="n" style="color: #333;">id</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0b4d386cc779db18e9fdb266cf76bff341fb126a#5461e7beeb7ae73d7c01f720cbaa3fa2c5333590"><strong>compiler/GHC/Tc/Utils/TcType.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -857,6 +857,10 @@ any_rewritable :: Bool -- Ignore casts and coercions</td>
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<pre style="margin: 0;"> <span id="LC857" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ORing the results of the predicates above together</span></span>
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858
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858
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<pre style="margin: 0;"> <span id="LC858" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Do not look inside casts and coercions if 'ignore_cos' is True</span></span>
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859
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859
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<pre style="margin: 0;"> <span id="LC859" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [anyRewritableTyVar must be role-aware]</span></span>
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860
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<pre style="margin: 0;">+<span id="LC860" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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861
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<pre style="margin: 0;">+<span id="LC861" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This looks like it should use foldTyCo, but that function is</span></span>
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862
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<pre style="margin: 0;">+<span id="LC862" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- role-agnostic, and this one must be role-aware. We could make</span></span>
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863
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<pre style="margin: 0;">+<span id="LC863" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- foldTyCon role-aware, but that may slow down more common usages.</span></span>
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860
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864
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<pre style="margin: 0;"> <span id="LC864" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINE any_rewritable #-}</span> <span class="c1" style="color: #998; font-style: italic;">-- this allows specialization of predicates</span></span>
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861
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865
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<pre style="margin: 0;"> <span id="LC865" class="line" lang="haskell"><span class="n" style="color: #333;">any_rewritable</span> <span class="n" style="color: #333;">ignore_cos</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">tv_pred</span> <span class="n" style="color: #333;">tc_pred</span> <span class="n" style="color: #333;">should_expand</span></span>
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862
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866
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<pre style="margin: 0;"> <span id="LC866" 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;">role</span> <span class="n" style="color: #333;">emptyVarSet</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0b4d386cc779db18e9fdb266cf76bff341fb126a#74295edeac870ee7f2f3484ebaffab5c948b735a"><strong>compiler/GHC/Tc/Utils/Unify.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1989" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1989" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1989,6 +1989,11 @@ checkTypeEq :: DynFlags -> AreTypeFamiliesOK -> CanEqLHS -> TcType</td>
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1989
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1989
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<pre style="margin: 0;"> <span id="LC1989" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- inside the kinds of variables it mentions. For (d) we look deeply</span></span>
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1990
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1990
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<pre style="margin: 0;"> <span id="LC1990" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- in coercions when the LHS is a tyvar (but skip coercions for type family</span></span>
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1991
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1991
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<pre style="margin: 0;"> <span id="LC1991" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- LHSs), and for (e) see Note [CEqCan occurs check] in GHC.Tc.Types.Constraint.</span></span>
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1992
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<pre style="margin: 0;">+<span id="LC1992" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1993
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<pre style="margin: 0;">+<span id="LC1993" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- checkTypeEq is called from</span></span>
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1994
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<pre style="margin: 0;">+<span id="LC1994" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * checkTyFamEq, checkTyVarEq (which inline it to specialise away the</span></span>
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1995
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<pre style="margin: 0;">+<span id="LC1995" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- case-analysis on 'lhs'</span></span>
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1996
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<pre style="margin: 0;">+<span id="LC1996" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- * checkEqCanLHSFinish, which does not know the form of 'lhs'</span></span>
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1992
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1997
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<pre style="margin: 0;"> <span id="LC1997" 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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1993
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1998
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<pre style="margin: 0;"> <span id="LC1998" 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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1994
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1999
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<pre style="margin: 0;"> <span id="LC1999" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2047" 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="2052" 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">@@ -2047,14 +2052,15 @@ checkTypeEq dflags ty_fam_ok lhs ty</td>
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2047
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2052
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<pre style="margin: 0;"> <span id="LC2052" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- this slightly peculiar way of defining this means</span></span>
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2048
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2053
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<pre style="margin: 0;"> <span id="LC2053" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we don't have to evaluate this `case` at every tyconapp</span></span>
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2049
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2054
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<pre style="margin: 0;"> <span id="LC2054" class="line" lang="haskell"> <span class="n" style="color: #333;">go_tc</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lhs</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2050
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<pre style="margin: 0;">-<span id="LC2050" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TyVarLHS</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span> <span class="o" style="font-weight: 600;">-></span><span class="idiff left"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">if</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">good_tc</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">tc</span></span></span>
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2051
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<td class="diff-line-num new_line old" data-linenumber="2055" 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="LC2051" class="line" lang="haskell"> <span class="idiff left"> </span><span class="kr" style="font-weight: 600;"><span class="idiff right">then</span></span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">tys</span> <span class="o" style="font-weight: 600;">>></span> <span class="n" style="color: #333;">ok</span></span>
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2052
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<td class="diff-line-num new_line old" data-linenumber="2055" 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="LC2052" class="line" lang="haskell"> <span class="idiff left"> </span><span class="kr" style="font-weight: 600;"><span class="idiff right">else</span></span> <span class="kt" style="color: #458; font-weight: 600;">MTVU_Bad</span></span>
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2055
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<pre style="margin: 0;">+<span id="LC2055" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TyVarLHS</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span> <span class="o" style="font-weight: 600;">-></span></span>
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2056
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<pre style="margin: 0;">+<span id="LC2056" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;"><span class="idiff left">if</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">good_tc</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tc</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">-></span></span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">tys</span> <span class="o" style="font-weight: 600;">>></span> <span class="n" style="color: #333;">ok</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2057" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2057
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<pre style="margin: 0;">+<span id="LC2057" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><span class="idiff left">|</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">otherwise</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">-></span></span> <span class="kt" style="color: #458; font-weight: 600;">MTVU_Bad</span></span>
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2053
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2058
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<pre style="margin: 0;"> <span id="LC2058" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TyFamLHS</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">fam_args</span> <span class="o" style="font-weight: 600;">-></span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span> <span class="o" style="font-weight: 600;">-></span></span>
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2054
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2059
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<pre style="margin: 0;"> <span id="LC2059" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">if</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">tcEqTyConApps</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">fam_args</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MTVU_Occurs</span></span>
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2055
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2060
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<pre style="margin: 0;"> <span id="LC2060" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">good_tc</span> <span class="n" style="color: #333;">tc</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">tys</span> <span class="o" style="font-weight: 600;">>></span> <span class="n" style="color: #333;">ok</span></span>
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2056
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2061
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<pre style="margin: 0;"> <span id="LC2061" 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;">MTVU_Bad</span></span>
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2057
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2062
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<pre style="margin: 0;"> <span id="LC2062" class="line" lang="haskell"></span>
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2063
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<pre style="margin: 0;">+<span id="LC2063" class="line" lang="haskell"></span>
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2058
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2064
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<pre style="margin: 0;"> <span id="LC2064" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- no bother about impredicativity in coercions, as they're</span></span>
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2059
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2065
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<pre style="margin: 0;"> <span id="LC2065" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- inferred</span></span>
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2060
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2066
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<pre style="margin: 0;"> <span id="LC2066" class="line" lang="haskell"> <span class="n" style="color: #333;">go_co</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">gopt</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_DeferTypeErrors</span> <span class="n" style="color: #333;">dflags</span><span class="p">)</span></span>
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