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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/ebfebd6fd6e6407bc0c8ad81d31616b76fc8ce3d">ebfebd6f</a></strong>
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<span>by Richard Eisenberg</span>
<i>at 2020-11-02T18:02:22-05:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Subtleties in Note [Instance and Given overlap]
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<h4>7 changed files:</h4>
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<a href="#691eec62dc293d0881c314b38b7363dc88b44c59">
compiler/GHC/Core/Map/Type.hs
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<li class="file-stats">
<a href="#039e8f5676356ef05c90af828aae48aac7296e47">
compiler/GHC/Core/TyCo/FVs.hs
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<li class="file-stats">
<a href="#84c9d3ba34173297e7d7747e02caa2e004b164fc">
compiler/GHC/Core/Type.hs
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<li class="file-stats">
<a href="#89a2e0e1a3095c7a42b10f2819049908908080e8">
compiler/GHC/Core/Unify.hs
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<li class="file-stats">
<a href="#f639b0b31b7245cb7d34ac190b798f5ec1c7da2e">
compiler/GHC/Tc/Solver/Interact.hs
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<li class="file-stats">
<a href="#0c6b585a8a21f8340a85ca2cef89c4b1bf5a8953">
compiler/GHC/Tc/Solver/Monad.hs
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<li class="file-stats">
<a href="#34fe7bf0e6fbf60effb28393399ba68666593909">
testsuite/tests/typecheck/should_compile/all.T
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<h4>Changes:</h4>
<li id="691eec62dc293d0881c314b38b7363dc88b44c59">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ebfebd6fd6e6407bc0c8ad81d31616b76fc8ce3d#691eec62dc293d0881c314b38b7363dc88b44c59"><strong>compiler/GHC/Core/Map/Type.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="8" 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">@@ -8,6 +8,9 @@</td>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE TypeFamilies #-}</span></span>
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<td class="diff-line-num new_line" data-linenumber="9" 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">
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="haskell"></span>
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<td class="diff-line-num old_line" data-linenumber="10" 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">
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.Core.Map.Type</span> <span class="p">(</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * Re-export generic interface</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TrieMap</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * Maps over 'Type's</span></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TypeMap</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">emptyTypeMap</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">extendTypeMap</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">lookupTypeMap</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">foldTypeMap</span><span class="p">,</span></span>
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<td class="diff-line-num new_line" data-linenumber="16" 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">
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">LooseTypeMap</span><span class="p">,</span></span>
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<li id="039e8f5676356ef05c90af828aae48aac7296e47">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ebfebd6fd6e6407bc0c8ad81d31616b76fc8ce3d#039e8f5676356ef05c90af828aae48aac7296e47"><strong>compiler/GHC/Core/TyCo/FVs.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">@@ -26,7 +26,8 @@ module GHC.Core.TyCo.FVs</td>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">injectiveVarsOfType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">injectiveVarsOfTypes</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">invisibleVarsOfType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">invisibleVarsOfTypes</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC29" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- No Free vars</span></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Any and No Free vars</span></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">anyFreeVarsOfType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">anyFreeVarsOfTypes</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">anyFreeVarsOfCo</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">noFreeVarsOfType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">noFreeVarsOfTypes</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">noFreeVarsOfCo</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * Well-scoped free variables</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">@@ -47,7 +48,7 @@ import GHC.Prelude</td>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">{-#</span> <span class="nn" style="color: #555;">SOURCE</span> <span class="o" style="font-weight: 600;">#-</span><span class="p">}</span> <span class="kt" style="color: #458; font-weight: 600;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Core</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="p">(</span><span class="n" style="color: #333;">coreView</span><span class="p">,</span> <span class="n" style="color: #333;">partitionInvisibleTypes</span><span class="p">)</span></span>
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50
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC50" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Monoid</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">DM</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Endo</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">A<span class="idiff left right">ll</span></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="LC51" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Monoid</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">DM</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Endo</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">A<span class="idiff left right">ny</span></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="LC52" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCo.Rep</span></span>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCon</span></span>
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var</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">@@ -855,32 +856,43 @@ invisibleVarsOfTypes = mapUnionFV invisibleVarsOfType</td>
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855
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856
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<pre style="margin: 0;"> <span id="LC856" class="line" lang="haskell"></span>
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856
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857
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<pre style="margin: 0;"> <span id="LC857" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *********************************************************************</span></span>
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857
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858
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<pre style="margin: 0;"> <span id="LC858" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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858
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<pre style="margin: 0;">-<span id="LC858" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">No</span> free vars</span></span>
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<pre style="margin: 0;">+<span id="LC859" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">Any</span> free vars</span></span>
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859
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860
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<pre style="margin: 0;"> <span id="LC860" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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860
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861
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<pre style="margin: 0;"> <span id="LC861" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">********************************************************************* -}</span></span>
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861
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862
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<pre style="margin: 0;"> <span id="LC862" class="line" lang="haskell"></span>
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862
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<pre style="margin: 0;">-<span id="LC862" class="line" lang="haskell"><span class="n" style="color: #333;">nfvFolder</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCoFolder</span> <span class="kt" style="color: #458; font-weight: 600;">TyCoVarSet</span> <span class="kt" style="color: #458; font-weight: 600;">DM</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">All</span></span>
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863
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<pre style="margin: 0;">-<span id="LC863" class="line" lang="haskell"><span class="n" style="color: #333;">nfvFolder</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;">noView</span></span>
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864
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<pre style="margin: 0;">-<span id="LC864" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcf_tyvar</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">do_tcv</span><span class="p">,</span> <span class="n" style="color: #333;">tcf_covar</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">do_tcv</span></span>
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865
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<pre style="margin: 0;">-<span id="LC865" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcf_hole</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">do_hole</span><span class="p">,</span> <span class="n" style="color: #333;">tcf_tycobinder</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">do_bndr</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC863" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINE afvFolder #-}</span> <span class="c1" style="color: #998; font-style: italic;">-- so that specialization to (const True) works</span></span>
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<pre style="margin: 0;">+<span id="LC864" class="line" lang="haskell"><span class="n" style="color: #333;">afvFolder</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyCoVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCoFolder</span> <span class="kt" style="color: #458; font-weight: 600;">TyCoVarSet</span> <span class="kt" style="color: #458; font-weight: 600;">DM</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="LC865" class="line" lang="haskell"><span class="n" style="color: #333;">afvFolder</span> <span class="n" style="color: #333;">check_fv</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;">noView</span></span>
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<pre style="margin: 0;">+<span id="LC866" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcf_tyvar</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">do_tcv</span><span class="p">,</span> <span class="n" style="color: #333;">tcf_covar</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">do_tcv</span></span>
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<pre style="margin: 0;">+<span id="LC867" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcf_hole</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">do_hole</span><span class="p">,</span> <span class="n" style="color: #333;">tcf_tycobinder</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">do_bndr</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC868" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC867" class="line" lang="haskell"> <span class="n" style="color: #333;">do_tcv</span> <span class="n" style="color: #333;">is</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">A<span class="idiff left">ll</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">tv</span></span><span class="idiff"> </span><span class="p"><span class="idiff">`</span></span><span class="n" style="color: #333;"><span class="idiff">elemVarSet</span></span><span class="p"><span class="idiff">`</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">is</span></span><span class="p">)</span></span>
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868
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<pre style="margin: 0;">-<span id="LC868" class="line" lang="haskell"> <span class="n" style="color: #333;">do_hole</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">A<span class="idiff left">ll</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Tru</span>e</span> <span class="c1" style="color: #998; font-style: italic;">-- I'm unsure; probably never happens</span></span>
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<pre style="margin: 0;">+<span id="LC869" class="line" lang="haskell"> <span class="n" style="color: #333;">do_tcv</span> <span class="n" style="color: #333;">is</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">A<span class="idiff left">ny</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">not</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">tv</span></span><span class="idiff"> </span><span class="p"><span class="idiff">`</span></span><span class="n" style="color: #333;"><span class="idiff">elemVarSet</span></span><span class="p"><span class="idiff">`</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">is</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">&&</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">check_fv</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">tv</span></span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC870" class="line" lang="haskell"> <span class="n" style="color: #333;">do_hole</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">A<span class="idiff left">ny</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Fals</span>e</span> <span class="c1" style="color: #998; font-style: italic;">-- I'm unsure; probably never happens</span></span>
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<pre style="margin: 0;"> <span id="LC871" class="line" lang="haskell"> <span class="n" style="color: #333;">do_bndr</span> <span class="n" style="color: #333;">is</span> <span class="n" style="color: #333;">tv</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">is</span> <span class="p">`</span><span class="n" style="color: #333;">extendVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">tv</span></span>
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<pre style="margin: 0;"> <span id="LC872" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC871" class="line" lang="haskell"><span class="n" style="color: #333;">nfv_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;">DM</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">All</span></span>
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<pre style="margin: 0;">-<span id="LC872" class="line" lang="haskell"><span class="n" style="color: #333;">nfv_tys</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DM</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">All</span></span>
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<pre style="margin: 0;">-<span id="LC873" class="line" lang="haskell"><span class="n" style="color: #333;">nfv_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;">DM</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">All</span></span>
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<pre style="margin: 0;">-<span id="LC874" class="line" lang="haskell"><span class="p">(</span><span class="n" style="color: #333;">nfv_ty</span><span class="p">,</span> <span class="n" style="color: #333;">nfv_tys</span><span class="p">,</span> <span class="n" style="color: #333;">nfv_co</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldTyCo</span> <span class="n" style="color: #333;">nfvFolder</span> <span class="n" style="color: #333;">emptyVarSet</span></span>
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<pre style="margin: 0;">+<span id="LC873" class="line" lang="haskell"><span class="n" style="color: #333;">anyFreeVarsOfType</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyCoVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">)</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="LC874" class="line" lang="haskell"><span class="n" style="color: #333;">anyFreeVarsOfType</span> <span class="n" style="color: #333;">check_fv</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">DM</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">getAny</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC875" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="p">(</span><span class="n" style="color: #333;">f</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldTyCo</span> <span class="p">(</span><span class="n" style="color: #333;">afvFolder</span> <span class="n" style="color: #333;">check_fv</span><span class="p">)</span> <span class="n" style="color: #333;">emptyVarSet</span></span>
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<pre style="margin: 0;">+<span id="LC876" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC877" class="line" lang="haskell"><span class="n" style="color: #333;">anyFreeVarsOfTypes</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyCoVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC878" class="line" lang="haskell"><span class="n" style="color: #333;">anyFreeVarsOfTypes</span> <span class="n" style="color: #333;">check_fv</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;">DM</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">getAny</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC879" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">f</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldTyCo</span> <span class="p">(</span><span class="n" style="color: #333;">afvFolder</span> <span class="n" style="color: #333;">check_fv</span><span class="p">)</span> <span class="n" style="color: #333;">emptyVarSet</span></span>
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<pre style="margin: 0;">+<span id="LC880" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC881" class="line" lang="haskell"><span class="n" style="color: #333;">anyFreeVarsOfCo</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyCoVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">)</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="LC882" class="line" lang="haskell"><span class="n" style="color: #333;">anyFreeVarsOfCo</span> <span class="n" style="color: #333;">check_fv</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;">DM</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">getAny</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC883" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">f</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldTyCo</span> <span class="p">(</span><span class="n" style="color: #333;">afvFolder</span> <span class="n" style="color: #333;">check_fv</span><span class="p">)</span> <span class="n" style="color: #333;">emptyVarSet</span></span>
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<pre style="margin: 0;"> <span id="LC884" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC885" class="line" lang="haskell"><span class="n" style="color: #333;">noFreeVarsOfType</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="LC877" class="line" lang="haskell"><span class="n" style="color: #333;">noFreeVarsOfType</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">DM</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">getAll</span> <span class="p">(</span><span class="n" style="color: #333;">nfv_ty</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC886" class="line" lang="haskell"><span class="n" style="color: #333;">noFreeVarsOfType</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">not</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">DM</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">getAny</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC887" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="p">(</span><span class="n" style="color: #333;">f</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldTyCo</span> <span class="p">(</span><span class="n" style="color: #333;">afvFolder</span> <span class="p">(</span><span class="n" style="color: #333;">const</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">))</span> <span class="n" style="color: #333;">emptyVarSet</span></span>
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<pre style="margin: 0;"> <span id="LC888" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC889" class="line" lang="haskell"><span class="n" style="color: #333;">noFreeVarsOfTypes</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">-<span id="LC880" class="line" lang="haskell"><span class="n" style="color: #333;">noFreeVarsOfTypes</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;">DM</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">getAll</span> <span class="p">(</span><span class="n" style="color: #333;">nfv_tys</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC890" class="line" lang="haskell"><span class="n" style="color: #333;">noFreeVarsOfTypes</span> <span class="n" style="color: #333;">tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">not</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">DM</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">getAny</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC891" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">f</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldTyCo</span> <span class="p">(</span><span class="n" style="color: #333;">afvFolder</span> <span class="p">(</span><span class="n" style="color: #333;">const</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">))</span> <span class="n" style="color: #333;">emptyVarSet</span></span>
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<pre style="margin: 0;"> <span id="LC892" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC893" class="line" lang="haskell"><span class="n" style="color: #333;">noFreeVarsOfCo</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="LC883" class="line" lang="haskell"><span class="n" style="color: #333;">noFreeVarsOfCo</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">getAll</span> <span class="p">(</span><span class="n" style="color: #333;">nfv_co</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC894" class="line" lang="haskell"><span class="n" style="color: #333;">noFreeVarsOfCo</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="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">DM</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">getAny</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC895" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">f</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldTyCo</span> <span class="p">(</span><span class="n" style="color: #333;">afvFolder</span> <span class="p">(</span><span class="n" style="color: #333;">const</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">))</span> <span class="n" style="color: #333;">emptyVarSet</span></span>
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<pre style="margin: 0;"> <span id="LC896" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC897" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC898" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *********************************************************************</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -983,4 +995,3 @@ tyCoVarsOfTypeWellScoped = scopedSort . tyCoVarsOfTypeList</td>
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<pre style="margin: 0;"> <span id="LC995" class="line" lang="haskell"><span class="cd">-- | Get the free vars of types in scoped order</span></span>
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<pre style="margin: 0;"> <span id="LC996" class="line" lang="haskell"><span class="n" style="color: #333;">tyCoVarsOfTypesWellScoped</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC997" class="line" lang="haskell"><span class="n" style="color: #333;">tyCoVarsOfTypesWellScoped</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">scopedSort</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">tyCoVarsOfTypesList</span></span></pre>
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<pre style="margin: 0;">-<span id="LC986" class="line" lang="haskell"></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ebfebd6fd6e6407bc0c8ad81d31616b76fc8ce3d#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">@@ -156,6 +156,7 @@ module GHC.Core.Type (</td>
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<pre style="margin: 0;"> <span id="LC156" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">coVarsOfType</span><span class="p">,</span></span>
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157
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<pre style="margin: 0;"> <span id="LC157" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">coVarsOfTypes</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC158" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC159" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">anyFreeVarsOfType</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC160" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">noFreeVarsOfType</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC161" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">splitVisVarsOfType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">splitVisVarsOfTypes</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC162" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">expandTypeSynonyms</span><span class="p">,</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ebfebd6fd6e6407bc0c8ad81d31616b76fc8ce3d#89a2e0e1a3095c7a42b10f2819049908908080e8"><strong>compiler/GHC/Core/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">@@ -24,7 +24,7 @@ module GHC.Core.Unify (</td>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">liftCoMatch</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The core flattening algorithm</span></span>
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<pre style="margin: 0;">-<span id="LC27" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">flattenTys</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">flattenTys</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">flattenTysX</span></span></span>
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<pre style="margin: 0;"> <span id="LC28" 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="LC29" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="n" style="color: #333;">include</span> <span class="s" style="color: #d14;">"HsVersions.h"</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">@@ -1806,12 +1806,17 @@ updateInScopeSet env upd = env { fe_in_scope = upd (fe_in_scope env) }</td>
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1806
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<pre style="margin: 0;"> <span id="LC1806" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1807" class="line" lang="haskell"><span class="n" style="color: #333;">flattenTys</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">InScopeSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="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="LC1808" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Flattening]</span></span>
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<pre style="margin: 0;">-<span id="LC1809" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- NB: the returned types may mention fresh type variables,</span></span>
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<pre style="margin: 0;">-<span id="LC1810" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- arising from the flattening. We don't return the</span></span>
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<pre style="margin: 0;">+<span id="LC1809" class="line" lang="haskell"><span class="n" style="color: #333;">flattenTys</span> <span class="n" style="color: #333;">in_scope</span> <span class="n" style="color: #333;">tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fst</span> <span class="p">(</span><span class="n" style="color: #333;">flattenTysX</span> <span class="n" style="color: #333;">in_scope</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1810" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1811" class="line" lang="haskell"><span class="n" style="color: #333;">flattenTysX</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">InScopeSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">TyVarSet</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1812" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Flattening]</span></span>
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<pre style="margin: 0;">+<span id="LC1813" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- NB: the returned types mention the fresh type variables</span></span>
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<pre style="margin: 0;">+<span id="LC1814" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- in the returned set. We don't return the</span></span>
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<pre style="margin: 0;"> <span id="LC1815" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- mapping from those fresh vars to the ty-fam</span></span>
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1816
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<pre style="margin: 0;"> <span id="LC1816" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- applications they stand for (we could, but no need)</span></span>
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<pre style="margin: 0;">-<span id="LC1813" class="line" lang="haskell"><span class="n" style="color: #333;">flattenTys</span> <span class="n" style="color: #333;">in_scope</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;">-<span id="LC1814" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">snd</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">coreFlattenTys</span> <span class="n" style="color: #333;">emptyTvSubstEnv</span> <span class="p">(</span><span class="n" style="color: #333;">emptyFlattenEnv</span> <span class="n" style="color: #333;">in_scope</span><span class="p">)</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;">+<span id="LC1817" class="line" lang="haskell"><span class="n" style="color: #333;">flattenTysX</span> <span class="n" style="color: #333;">in_scope</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;">+<span id="LC1818" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">env</span><span class="p">,</span> <span class="n" style="color: #333;">result</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">coreFlattenTys</span> <span class="n" style="color: #333;">emptyTvSubstEnv</span> <span class="p">(</span><span class="n" style="color: #333;">emptyFlattenEnv</span> <span class="n" style="color: #333;">in_scope</span><span class="p">)</span> <span class="n" style="color: #333;">tys</span> <span class="kr" style="font-weight: 600;">in</span></span>
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<pre style="margin: 0;">+<span id="LC1819" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">result</span><span class="p">,</span> <span class="n" style="color: #333;">foldTM</span> <span class="p">(</span><span class="n" style="color: #333;">flip</span> <span class="n" style="color: #333;">extendVarSet</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">fe_type_map</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">emptyVarSet</span><span class="p">)</span></span>
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1820
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<pre style="margin: 0;"> <span id="LC1820" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1821" class="line" lang="haskell"><span class="n" style="color: #333;">coreFlattenTys</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TvSubstEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FlattenEnv</span></span>
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1822
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<pre style="margin: 0;"> <span id="LC1822" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FlattenEnv</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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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ebfebd6fd6e6407bc0c8ad81d31616b76fc8ce3d#f639b0b31b7245cb7d34ac190b798f5ec1c7da2e"><strong>compiler/GHC/Tc/Solver/Interact.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">@@ -2116,12 +2116,7 @@ Other notes:</td>
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<pre style="margin: 0;"> <span id="LC2116" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - natural numbers</span></span>
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<pre style="margin: 0;"> <span id="LC2117" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - Typeable</span></span>
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<pre style="margin: 0;"> <span id="LC2118" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2119" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Flatten-skolems: we do not treat a flatten-skolem as unifiable</span></span>
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<pre style="margin: 0;">-<span id="LC2120" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> for this purpose.</span></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;"> E.g. f :: Eq (F a) => [a] -> [a]</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;"> f xs = ....(xs==xs).....</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;"> Here we get [W] Eq [a], and we don't want to refrain from solving</span></span>
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<pre style="margin: 0;">-<span id="LC2124" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> it because of the given (Eq (F a)) constraint!</span></span>
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<pre style="margin: 0;">+<span id="LC2119" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* See also Note [What might match later?] in GHC.Tc.Solver.Monad.</span></span>
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<pre style="margin: 0;"> <span id="LC2120" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2121" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* The given-overlap problem is arguably not easy to appear in practice</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;"> due to our aggressive prioritization of equality solving over other</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ebfebd6fd6e6407bc0c8ad81d31616b76fc8ce3d#0c6b585a8a21f8340a85ca2cef89c4b1bf5a8953"><strong>compiler/GHC/Tc/Solver/Monad.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2124,10 +2124,31 @@ matchableGivens loc_w pred_w (IS { inert_cans = inert_cans })</td>
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<pre style="margin: 0;"> <span id="LC2124" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;"> <span id="LC2125" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2126" class="line" lang="haskell"><span class="n" style="color: #333;">mightMatchLater</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcPredType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcPredType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</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="LC2127" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [What might match later?]</span></span>
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2128
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<pre style="margin: 0;"> <span id="LC2128" class="line" lang="haskell"><span class="n" style="color: #333;">mightMatchLater</span> <span class="n" style="color: #333;">given_pred</span> <span class="n" style="color: #333;">given_loc</span> <span class="n" style="color: #333;">wanted_pred</span> <span class="n" style="color: #333;">wanted_loc</span></span>
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2128
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<pre style="margin: 0;">-<span id="LC2128" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">prohibitedSuperClassSolve</span> <span class="n" style="color: #333;">given_loc</span> <span class="n" style="color: #333;">wanted_loc</span><span class="p">)</span></span>
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2129
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<pre style="margin: 0;">-<span id="LC2129" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">isJust</span> <span class="p">(</span><span class="n" style="color: #333;">tcUnifyTys</span> <span class="n" style="color: #333;">bind_meta_tv</span> <span class="p">[</span><span class="n" style="color: #333;">given_pred</span><span class="p">]</span> <span class="p">[</span><span class="n" style="color: #333;">wanted_pred</span><span class="p">])</span></span>
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<pre style="margin: 0;">+<span id="LC2129" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">prohibitedSuperClassSolve</span> <span class="n" style="color: #333;">given_loc</span> <span class="n" style="color: #333;">wanted_loc</span></span>
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<pre style="margin: 0;">+<span id="LC2130" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">+<span id="LC2131" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2132" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">SurelyApart</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcUnifyTysFG</span> <span class="n" style="color: #333;">bind_meta_tv</span> <span class="n" style="color: #333;">flattened_given</span> <span class="n" style="color: #333;">flattened_wanted</span></span>
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<pre style="margin: 0;">+<span id="LC2133" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">+<span id="LC2134" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2135" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<pre style="margin: 0;">+<span id="LC2136" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="c1" style="color: #998; font-style: italic;">-- safe answer</span></span>
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2130
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2137
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<pre style="margin: 0;"> <span id="LC2137" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC2138" class="line" lang="haskell"> <span class="n" style="color: #333;">given_in_scope</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkInScopeSet</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tyCoVarsOfType</span> <span class="n" style="color: #333;">given_pred</span></span>
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<pre style="margin: 0;">+<span id="LC2139" class="line" lang="haskell"> <span class="n" style="color: #333;">wanted_in_scope</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkInScopeSet</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tyCoVarsOfType</span> <span class="n" style="color: #333;">wanted_pred</span></span>
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2140
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<pre style="margin: 0;">+<span id="LC2140" class="line" lang="haskell"></span>
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2141
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<pre style="margin: 0;">+<span id="LC2141" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">flattened_given</span><span class="p">,</span> <span class="n" style="color: #333;">given_vars</span><span class="p">)</span></span>
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2142
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<pre style="margin: 0;">+<span id="LC2142" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">anyFreeVarsOfType</span> <span class="n" style="color: #333;">isMetaTyVar</span> <span class="n" style="color: #333;">given_pred</span></span>
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2143
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<pre style="margin: 0;">+<span id="LC2143" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">flattenTysX</span> <span class="n" style="color: #333;">given_in_scope</span> <span class="p">[</span><span class="n" style="color: #333;">given_pred</span><span class="p">]</span></span>
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2144
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<pre style="margin: 0;">+<span id="LC2144" 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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2145
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<pre style="margin: 0;">+<span id="LC2145" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">([</span><span class="n" style="color: #333;">given_pred</span><span class="p">],</span> <span class="n" style="color: #333;">emptyVarSet</span><span class="p">)</span></span>
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2146
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<pre style="margin: 0;">+<span id="LC2146" class="line" lang="haskell"></span>
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2147
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<pre style="margin: 0;">+<span id="LC2147" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">flattened_wanted</span><span class="p">,</span> <span class="n" style="color: #333;">wanted_vars</span><span class="p">)</span></span>
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2148
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<pre style="margin: 0;">+<span id="LC2148" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">flattenTysX</span> <span class="n" style="color: #333;">wanted_in_scope</span> <span class="p">[</span><span class="n" style="color: #333;">wanted_pred</span><span class="p">]</span></span>
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2149
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<pre style="margin: 0;">+<span id="LC2149" class="line" lang="haskell"></span>
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2150
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<pre style="margin: 0;">+<span id="LC2150" class="line" lang="haskell"> <span class="n" style="color: #333;">all_flat_vars</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">given_vars</span> <span class="p">`</span><span class="n" style="color: #333;">unionVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">wanted_vars</span></span>
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2151
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<pre style="margin: 0;">+<span id="LC2151" class="line" lang="haskell"></span>
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2131
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2152
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<pre style="margin: 0;"> <span id="LC2152" class="line" lang="haskell"> <span class="n" style="color: #333;">bind_meta_tv</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">BindFlag</span></span>
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2132
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2153
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<pre style="margin: 0;"> <span id="LC2153" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Any meta tyvar may be unified later, so we treat it as</span></span>
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2133
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2154
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<pre style="margin: 0;"> <span id="LC2154" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- bindable when unifying with givens. That ensures that we</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">@@ -2135,8 +2156,12 @@ mightMatchLater given_pred given_loc wanted_pred wanted_loc</td>
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2135
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2156
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<pre style="margin: 0;"> <span id="LC2156" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- something that matches the 'given', until demonstrated</span></span>
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2136
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<pre style="margin: 0;"> <span id="LC2157" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- otherwise. More info in Note [Instance and Given overlap]</span></span>
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2137
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2158
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<pre style="margin: 0;"> <span id="LC2158" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in GHC.Tc.Solver.Interact</span></span>
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2138
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<pre style="margin: 0;">-<span id="LC2138" class="line" lang="haskell"> <span class="n" style="color: #333;">bind_meta_tv</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isMetaTyVar</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">BindMe</span></span>
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2139
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<pre style="margin: 0;">-<span id="LC2139" 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;">Skolem</span></span>
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2159
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<pre style="margin: 0;">+<span id="LC2159" class="line" lang="haskell"> <span class="n" style="color: #333;">bind_meta_tv</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isMetaTyVar</span> <span class="n" style="color: #333;">tv</span></span>
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2160
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<pre style="margin: 0;">+<span id="LC2160" 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;">isCycleBreakerTyVar</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">BindMe</span></span>
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2161
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<pre style="margin: 0;">+<span id="LC2161" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- a cycle-breaker var really stands for a type family</span></span>
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2162
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<pre style="margin: 0;">+<span id="LC2162" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- application where all variables are skolems</span></span>
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2163
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<pre style="margin: 0;">+<span id="LC2163" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">tv</span> <span class="p">`</span><span class="n" style="color: #333;">elemVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">all_flat_vars</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">BindMe</span></span>
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2164
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<pre style="margin: 0;">+<span id="LC2164" 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;">Skolem</span></span>
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2140
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2165
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<pre style="margin: 0;"> <span id="LC2165" class="line" lang="haskell"></span>
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2141
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2166
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<pre style="margin: 0;"> <span id="LC2166" class="line" lang="haskell"><span class="n" style="color: #333;">prohibitedSuperClassSolve</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</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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2142
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2167
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<pre style="margin: 0;"> <span id="LC2167" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Solving superclass constraints] in GHC.Tc.TyCl.Instance</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">@@ -2154,6 +2179,39 @@ because it is a candidate for floating out of this implication. We</td>
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2154
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2179
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<pre style="margin: 0;"> <span id="LC2179" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">only float equalities with a meta-tyvar on the left, so we only pull</span></span>
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2155
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2180
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<pre style="margin: 0;"> <span id="LC2180" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">those out here.</span></span>
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2156
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2181
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<pre style="margin: 0;"> <span id="LC2181" class="line" lang="haskell"></span>
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2182
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<pre style="margin: 0;">+<span id="LC2182" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [What might match later?]</span></span>
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2183
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<pre style="margin: 0;">+<span id="LC2183" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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2184
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<pre style="margin: 0;">+<span id="LC2184" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We must determine whether a Given might later match a Wanted. We</span></span>
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2185
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<pre style="margin: 0;">+<span id="LC2185" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">definitely need to account for the possibility that any metavariable</span></span>
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2186
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<pre style="margin: 0;">+<span id="LC2186" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in the Wanted might be arbitrarily instantiated. We do *not* want</span></span>
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2187
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<pre style="margin: 0;">+<span id="LC2187" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to allow skolems in the Given to be instantiated. But what about</span></span>
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2188
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<pre style="margin: 0;">+<span id="LC2188" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">type family applications?</span></span>
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2189
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<pre style="margin: 0;">+<span id="LC2189" class="line" lang="haskell"></span>
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2190
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<pre style="margin: 0;">+<span id="LC2190" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We break this down into two cases: a type family application in the</span></span>
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2191
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<pre style="margin: 0;">+<span id="LC2191" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Given, and a type family application in the Wanted.</span></span>
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2192
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<pre style="margin: 0;">+<span id="LC2192" class="line" lang="haskell"></span>
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2193
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<pre style="margin: 0;">+<span id="LC2193" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Given: Before ever looking at Wanteds, we process and simplify all</span></span>
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2194
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<pre style="margin: 0;">+<span id="LC2194" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the Givens. So any type family applications in a Given have already</span></span>
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2195
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<pre style="margin: 0;">+<span id="LC2195" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">been fully reduced. Furthermore, future Wanteds won't rewrite Givens,</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2196" 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">
2196
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<pre style="margin: 0;">+<span id="LC2196" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">so information we learn later can't come to bear. So we worry about</span></span>
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2197
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<pre style="margin: 0;">+<span id="LC2197" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">reduction of a type family application in a Given only when it has</span></span>
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2198
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<pre style="margin: 0;">+<span id="LC2198" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">an metavariable in it (necessarily unfilled, because these types</span></span>
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2199
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<pre style="margin: 0;">+<span id="LC2199" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">have been zonked before getting here). A Given with a metavariable</span></span>
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2200
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<pre style="margin: 0;">+<span id="LC2200" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is rare, but it can happen. See typecheck/should_compile/InstanceGivenOverlap2,</span></span>
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2201
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<pre style="margin: 0;">+<span id="LC2201" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">which uses partial type signatures and polykinds to pull it off.</span></span>
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2202
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<pre style="margin: 0;">+<span id="LC2202" class="line" lang="haskell"></span>
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2203
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<pre style="margin: 0;">+<span id="LC2203" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Wanted: Unlike the Given case, a type family application in a</span></span>
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2204
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<pre style="margin: 0;">+<span id="LC2204" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Wanted is always a cause for concern. Further information might allow</span></span>
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2205
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<pre style="margin: 0;">+<span id="LC2205" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">it to reduce, so we want to say that a type family application could</span></span>
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2206
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<pre style="margin: 0;">+<span id="LC2206" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">unify with any type.</span></span>
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2207
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<pre style="margin: 0;">+<span id="LC2207" class="line" lang="haskell"></span>
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2208
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<pre style="margin: 0;">+<span id="LC2208" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">How we do this: we use the *core* flattener, as defined in the</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2209" 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">
2209
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<pre style="margin: 0;">+<span id="LC2209" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">flattenTys function. See Note [Flattening] in GHC.Core.Unify. This</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2210" 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">
2210
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<pre style="margin: 0;">+<span id="LC2210" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">function takes any type family application and turns it into a fresh</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2211" 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">
2211
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<pre style="margin: 0;">+<span id="LC2211" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">variable. These fresh variables must be flagged with BindMe in the</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2212" 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">
2212
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<pre style="margin: 0;">+<span id="LC2212" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">bind_meta_tv function, so that the unifier will match them. This</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2213" 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">
2213
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<pre style="margin: 0;">+<span id="LC2213" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is the only reason we need to collect them here.</span></span>
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2214
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<pre style="margin: 0;">+<span id="LC2214" class="line" lang="haskell"></span>
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2157
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2215
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<pre style="margin: 0;"> <span id="LC2215" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [When does an implication have given equalities?]</span></span>
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2158
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<td class="diff-line-num new_line" data-linenumber="2216" 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">
2216
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<pre style="margin: 0;"> <span id="LC2216" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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2159
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2217
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<pre style="margin: 0;"> <span id="LC2217" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider an implication</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -723,3 +723,6 @@ test('T18470', normal, compile, [''])</td>
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<pre style="margin: 0;"> <span id="LC723" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18323</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC724" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18585</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC725" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T15942</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">+<span id="LC726" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">CbvOverlap</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">+<span id="LC727" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">InstanceGivenOverlap</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">+<span id="LC728" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">InstanceGivenOverlap2</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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