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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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<ul>
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fa4f10587c630b2afe51a026b81c44d2b064f719">fa4f1058</a></strong>
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<span>by Richard Eisenberg</span>
<i>at 2020-11-12T16:24:38-05:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Try removing (2b). Let's see what the testsuite says
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<h4>4 changed files:</h4>
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<a href="#783e5dae6e86931f06700fc088fb7d48c8a07386">
compiler/GHC/Core/Coercion.hs
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<li class="file-stats">
<a href="#691eec62dc293d0881c314b38b7363dc88b44c59">
compiler/GHC/Core/Map/Type.hs
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<a href="#f018e77421f495c6f75733fee4a511cfe57bebe8">
compiler/GHC/Tc/Solver/Canonical.hs
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compiler/GHC/Tc/Utils/Unify.hs
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<h4>Changes:</h4>
<li id="783e5dae6e86931f06700fc088fb7d48c8a07386">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fa4f10587c630b2afe51a026b81c44d2b064f719#783e5dae6e86931f06700fc088fb7d48c8a07386"><strong>compiler/GHC/Core/Coercion.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">@@ -122,7 +122,7 @@ module GHC.Core.Coercion (</td>
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122
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<pre style="margin: 0;"> <span id="LC122" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC123" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">simplifyArgsWorker</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC124" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC125" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left">badCoercionHole</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">bad</span>CoercionHoleCo</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC125" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left">hasCoercionHoleTy</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">has</span>CoercionHoleCo</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC126" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HoleSet</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">coercionHolesOfType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">coercionHolesOfCo</span></span>
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<pre style="margin: 0;"> <span id="LC127" class="line" lang="haskell"> <span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC128" 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">@@ -3050,9 +3050,9 @@ simplifyArgsWorker orig_ki_binders orig_inner_ki orig_fvs</td>
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<pre style="margin: 0;"> <span id="LC3050" 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="LC3051" 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="LC3052" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC3053" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left right">bad</span>_co_hole_ty</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;">Monoid</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Any</span></span>
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<pre style="margin: 0;">-<span id="LC3054" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left right">bad</span>_co_hole_co</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Monoid</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Any</span></span>
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<pre style="margin: 0;">-<span id="LC3055" class="line" lang="haskell"><span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">bad_co_hole_ty</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">bad</span>_co_hole_co</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC3053" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left right">has</span>_co_hole_ty</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;">Monoid</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Any</span></span>
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<pre style="margin: 0;">+<span id="LC3054" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left right">has</span>_co_hole_co</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Monoid</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Any</span></span>
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<pre style="margin: 0;">+<span id="LC3055" class="line" lang="haskell"><span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">has_co_hole_ty</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">has</span>_co_hole_co</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC3056" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldTyCo</span> <span class="n" style="color: #333;">folder</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC3057" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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3058
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<pre style="margin: 0;"> <span id="LC3058" class="line" lang="haskell"> <span class="n" style="color: #333;">folder</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TyCoFolder</span> <span class="p">{</span> <span class="n" style="color: #333;">tcf_view</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">const</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</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">@@ -3065,15 +3065,13 @@ bad_co_hole_co :: Coercion -> Monoid.Any</td>
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<pre style="margin: 0;"> <span id="LC3065" class="line" lang="haskell"> <span class="n" style="color: #333;">const2</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">c</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;"> <span id="LC3066" class="line" lang="haskell"> <span class="n" style="color: #333;">const2</span> <span class="n" style="color: #333;">x</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;"> <span id="LC3067" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC3068" class="line" lang="haskell"><span class="cd">-- | Is there a blocking coercion hole in this type? See</span></span>
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<pre style="margin: 0;">-<span id="LC3069" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- "GHC.Tc.Solver.Canonical" Note [Equalities with incompatible kinds]</span></span>
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<pre style="margin: 0;">-<span id="LC3070" class="line" lang="haskell"><span class="n" style="color: #333;">badCoercionHole</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;">Bool</span></span>
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<pre style="margin: 0;">-<span id="LC3071" class="line" lang="haskell"><span class="n" style="color: #333;">badCoercionHole</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Monoid</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">getAny</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">bad_co_hole_ty</span></span>
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<pre style="margin: 0;">+<span id="LC3068" class="line" lang="haskell"><span class="cd">-- | Is there a coercion hole in this type?</span></span>
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<pre style="margin: 0;">+<span id="LC3069" class="line" lang="haskell"><span class="n" style="color: #333;">hasCoercionHoleTy</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;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC3070" class="line" lang="haskell"><span class="n" style="color: #333;">hasCoercionHoleTy</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Monoid</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">getAny</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">has_co_hole_ty</span></span>
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<pre style="margin: 0;"> <span id="LC3071" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC3073" class="line" lang="haskell"><span class="cd">-- | Is there a blocking coercion hole in this coercion? See</span></span>
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<pre style="margin: 0;">-<span id="LC3074" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- GHC.Tc.Solver.Canonical Note [Equalities with incompatible kinds]</span></span>
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<pre style="margin: 0;">-<span id="LC3075" class="line" lang="haskell"><span class="n" style="color: #333;">badCoercionHoleCo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">-<span id="LC3076" class="line" lang="haskell"><span class="n" style="color: #333;">badCoercionHoleCo</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Monoid</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">getAny</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">bad_co_hole_co</span></span>
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<pre style="margin: 0;">+<span id="LC3072" class="line" lang="haskell"><span class="cd">-- | Is there a coercion hole in this coercion?</span></span>
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<pre style="margin: 0;">+<span id="LC3073" class="line" lang="haskell"><span class="n" style="color: #333;">hasCoercionHoleCo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC3074" class="line" lang="haskell"><span class="n" style="color: #333;">hasCoercionHoleCo</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Monoid</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">getAny</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">has_co_hole_co</span></span>
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<pre style="margin: 0;"> <span id="LC3075" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3076" class="line" lang="haskell"><span class="cd">-- | A set of 'CoercionHole's</span></span>
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<pre style="margin: 0;"> <span id="LC3077" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">HoleSet</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">UniqSet</span> <span class="kt" style="color: #458; font-weight: 600;">CoercionHole</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fa4f10587c630b2afe51a026b81c44d2b064f719#691eec62dc293d0881c314b38b7363dc88b44c59"><strong>compiler/GHC/Core/Map/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">@@ -154,7 +154,7 @@ data TypeMapX a</td>
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<pre style="margin: 0;"> <span id="LC154" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note that there is no tyconapp case; see Note [Equality on AppTys] in GHC.Core.Type</span></span>
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<pre style="margin: 0;"> <span id="LC155" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC156" class="line" lang="haskell"><span class="cd">-- | Squeeze out any synonyms, and change TyConApps to nested AppTys. Why the</span></span>
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<pre style="margin: 0;">-<span id="LC157" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- last one? See Note [Equality on AppTys] in <span class="idiff left right">"GHC.Core.Type"</span></span></span>
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<pre style="margin: 0;">+<span id="LC157" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- last one? See Note [Equality on AppTys] in <span class="idiff left right">GHC.Core.Type</span></span></span>
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<pre style="margin: 0;"> <span id="LC158" 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="LC159" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note, however, that we keep Constraint and Type apart here, despite the fact</span></span>
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<pre style="margin: 0;"> <span id="LC160" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- that they are both synonyms of TYPE 'LiftedRep (see #11715).</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fa4f10587c630b2afe51a026b81c44d2b064f719#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">@@ -43,7 +43,6 @@ import GHC.Builtin.Types ( anyTypeOfKind )</td>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Driver.Session</span><span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Name.Set</span></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Name.Reader</span></span>
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<pre style="margin: 0;">-<span id="LC46" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Unique.Set</span></span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Hs.Type</span><span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">HsIPName</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.Pair</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">@@ -109,7 +108,7 @@ canonicalize (CQuantCan (QCI { qci_ev = ev, qci_pend_sc = pend_sc }))</td>
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<pre style="margin: 0;"> <span id="LC108" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">canForAll</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">pend_sc</span></span>
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<pre style="margin: 0;"> <span id="LC109" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC110" class="line" lang="haskell"><span class="n" style="color: #333;">canonicalize</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CIrredCan</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ev</span><span class="p">,</span> <span class="n" style="color: #333;">cc_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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<pre style="margin: 0;">-<span id="LC112" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">BlockedCIS</span> <span class="n" style="color: #333;">holes</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">status</span></span>
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<pre style="margin: 0;">+<span id="LC111" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">{- "RAE"</span> | BlockedCIS holes <- status</span></span>
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<pre style="margin: 0;"> <span id="LC112" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> , isEmptyUniqSet holes</span></span>
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114
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<pre style="margin: 0;"> <span id="LC113" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- this would be a CEqCan if it weren't for the blocking hole, but that</span></span>
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<pre style="margin: 0;"> <span id="LC114" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- block has been removed. Warp straight to canEqCanLHSHomo.</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">@@ -128,7 +127,7 @@ canonicalize (CIrredCan { cc_ev = ev, cc_status = status })</td>
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128
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<pre style="margin: 0;"> <span id="LC127" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> _ -> canIrred status ev }</span></span>
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129
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<pre style="margin: 0;"> <span id="LC128" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- NB: The Irred is /not/ insoluble, so the special case below</span></span>
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<pre style="margin: 0;"> <span id="LC129" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- for insolubles (the direct call to canEqNC) does not apply.</span></span>
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<pre style="margin: 0;">-<span id="LC131" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC130" 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="LC131" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">EqPred</span> <span class="n" style="color: #333;">eq_rel</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">classifyPredType</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvPred</span> <span class="n" style="color: #333;">ev</span><span class="p">)</span></span>
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133
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<pre style="margin: 0;"> <span id="LC132" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- For insolubles (all of which are equalities), do /not/ flatten the arguments</span></span>
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134
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<pre style="margin: 0;"> <span id="LC133" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- In #14350 doing so led entire-unnecessary and ridiculously large</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">@@ -1034,7 +1033,7 @@ can_eq_nc' _flat _rdr_env _envs ev eq_rel</td>
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1034
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1033
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<pre style="margin: 0;"> <span id="LC1033" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- NB: we have expanded type synonyms already</span></span>
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1035
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1034
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<pre style="margin: 0;"> <span id="LC1034" class="line" lang="haskell"><span class="n" style="color: #333;">can_eq_nc'</span> <span class="n" style="color: #333;">_flat</span> <span class="n" style="color: #333;">_rdr_env</span> <span class="n" style="color: #333;">_envs</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">eq_rel</span> <span class="n" style="color: #333;">ty1</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ty2</span> <span class="kr" style="font-weight: 600;">_</span></span>
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1036
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1035
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<pre style="margin: 0;"> <span id="LC1035" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">tc1</span><span class="p">,</span> <span class="n" style="color: #333;">tys1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSplitTyConApp_maybe</span> <span class="n" style="color: #333;">ty1</span></span>
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1037
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<pre style="margin: 0;">-<span id="LC1037" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">tc2</span><span class="p">,</span> <span class="n" style="color: #333;">tys2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSplitTyConApp_maybe</span> <span class="n" style="color: #333;">ty2</span><span class="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">--</span></span></span>
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1036
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<pre style="margin: 0;">+<span id="LC1036" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">tc2</span><span class="p">,</span> <span class="n" style="color: #333;">tys2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSplitTyConApp_maybe</span> <span class="n" style="color: #333;">ty2</span></span>
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1038
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<pre style="margin: 0;"> <span id="LC1037" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we want to catch e.g. Maybe Int ~ (Int -> Int) here for better</span></span>
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<pre style="margin: 0;"> <span id="LC1038" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- error messages; hence no direct match on TyConApp</span></span>
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<pre style="margin: 0;"> <span id="LC1039" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isTypeFamilyTyCon</span> <span class="n" style="color: #333;">tc1</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">@@ -2506,8 +2505,17 @@ where</td>
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<pre style="margin: 0;"> <span id="LC2505" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> noDerived G = G</span></span>
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<pre style="margin: 0;"> <span id="LC2506" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> noDerived _ = W</span></span>
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<pre style="margin: 0;"> <span id="LC2507" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2509" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For Wanted/Derived, the [X] constraint is "blocked" (not CEqCan, is CIrred)</span></span>
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2510
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<pre style="margin: 0;">-<span id="LC2510" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">until the k1~k2 constraint solved: Wrinkle (2).</span></span>
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<pre style="margin: 0;">+<span id="LC2508" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For reasons described in Wrinkle (2) below, we want the [X] constraint to be "blocked";</span></span>
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<pre style="margin: 0;">+<span id="LC2509" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that is, it should be put aside, and not used to rewrite any other constraint,</span></span>
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<pre style="margin: 0;">+<span id="LC2510" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">until the kind-equality on which it depends (namely 'co' above) is solved.</span></span>
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<pre style="margin: 0;">+<span id="LC2511" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">To achieve this</span></span>
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<pre style="margin: 0;">+<span id="LC2512" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* The [X] constraint is a CIrredCan</span></span>
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<pre style="margin: 0;">+<span id="LC2513" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* With a cc_status of BlockedCIS bchs</span></span>
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<pre style="margin: 0;">+<span id="LC2514" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Where 'bchs' is the set of "blocking coercion holes". The blocking coercion</span></span>
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<pre style="margin: 0;">+<span id="LC2515" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> holes are the free coercion holes of [X]'s type</span></span>
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<pre style="margin: 0;">+<span id="LC2516" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* When all the blocking coercion holes in the CIrredCan are filled (solved),</span></span>
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<pre style="margin: 0;">+<span id="LC2517" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> we convert [X] to a CNonCanonical and put it in the work list.</span></span>
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<pre style="margin: 0;">+<span id="LC2518" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">All this is described in more detail in Wrinkle (2).</span></span>
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<pre style="margin: 0;"> <span id="LC2519" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2520" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Wrinkles:</span></span>
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<pre style="margin: 0;"> <span id="LC2521" 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">@@ -2527,8 +2535,8 @@ Wrinkles:</td>
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<pre style="margin: 0;"> <span id="LC2535" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2536" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> So, we have an invariant on CEqCan (TyEq:H) that the RHS does not have</span></span>
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<pre style="margin: 0;"> <span id="LC2537" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> any coercion holes. This is checked in checkTypeEq. Any equalities that</span></span>
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<pre style="margin: 0;">-<span id="LC2530" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> have such an RHS are turned in CIrredCans with a BlockedCIS status. We also</span></span>
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<pre style="margin: 0;">-<span id="LC2531" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> must be sure to kick out any constraints that mention coercion holes</span></span>
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<pre style="margin: 0;">+<span id="LC2538" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> have such an RHS are turned in<span class="idiff left right">to</span> CIrredCans with a BlockedCIS status. We also</span></span>
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<pre style="margin: 0;">+<span id="LC2539" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> must be sure to kick out any <span class="idiff left right">such CIrredCan </span>constraints that mention coercion holes</span></span>
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<pre style="margin: 0;"> <span id="LC2540" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> when those holes get filled in, so that the unification step can now proceed.</span></span>
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2541
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<pre style="margin: 0;"> <span id="LC2541" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2542" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (2a) We must now absolutely make sure to kick out any constraints that</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fa4f10587c630b2afe51a026b81c44d2b064f719#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">@@ -2058,13 +2058,19 @@ checkTypeEq dflags ty_fam_ok lhs ty</td>
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<pre style="margin: 0;"> <span id="LC2058" 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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<pre style="margin: 0;"> <span id="LC2059" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- inferred</span></span>
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<pre style="margin: 0;"> <span id="LC2060" 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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2061
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<pre style="margin: 0;">-<span id="LC2061" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">badCoercionHoleCo</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MTVU_HoleBlocker</span></span>
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2062
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<pre style="margin: 0;">-<span id="LC2062" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Wrinkle (4b) in "GHC.Tc.Solver.Canonical" Note [Equalities with incompatible kinds]</span></span>
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2061
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<pre style="margin: 0;">+<span id="LC2061" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hasCoercionHoleCo</span> <span class="n" style="color: #333;">co</span></span>
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<pre style="margin: 0;">+<span id="LC2062" class="line" lang="haskell"> <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;">-- Wrinkle (2) in GHC.Tc.Solver.Canonical</span></span>
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<pre style="margin: 0;">+<span id="LC2063" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See GHC.Tc.Solver.Canonical Note [Equalities with incompatible kinds]</span></span>
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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;">-- Wrinkle (2) about this case in general, Wrinkle (4b) about the check for</span></span>
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<pre style="margin: 0;">+<span id="LC2065" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- deferred type errors.</span></span>
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2066
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<pre style="margin: 0;"> <span id="LC2066" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2067" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">TyVarLHS</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lhs</span></span>
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<pre style="margin: 0;">-<span id="LC2065" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tv</span> <span class="p">`</span><span class="n" style="color: #333;">elemVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">tyCoVarsOfCo</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MTVU_Occurs</span></span>
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2068
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<pre style="margin: 0;">+<span id="LC2068" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tv</span> <span class="p">`</span><span class="n" style="color: #333;">elemVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">tyCoVarsOfCo</span> <span class="n" style="color: #333;">co</span></span>
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2069
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<pre style="margin: 0;">+<span id="LC2069" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MTVU_Occurs</span></span>
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2070
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<pre style="margin: 0;">+<span id="LC2070" class="line" lang="haskell"></span>
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2066
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2071
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<pre style="margin: 0;"> <span id="LC2071" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Don't check coercions for type families; see commentary at top of function</span></span>
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2067
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<pre style="margin: 0;">-<span id="LC2067" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ok</span></span>
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2072
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<pre style="margin: 0;">+<span id="LC2072" 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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2073
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<pre style="margin: 0;">+<span id="LC2073" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ok</span></span>
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2068
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2074
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<pre style="margin: 0;"> <span id="LC2074" class="line" lang="haskell"></span>
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2069
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2075
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<pre style="margin: 0;"> <span id="LC2075" class="line" lang="haskell"> <span class="n" style="color: #333;">good_tc</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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2070
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2076
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<pre style="margin: 0;"> <span id="LC2076" class="line" lang="haskell"> <span class="n" style="color: #333;">good_tc</span></span>
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