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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/5a9c493677d0ccbab27eaa467a0b095dbd6daef1">5a9c4936</a></strong>
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<span>by Richard Eisenberg</span>
<i>at 2020-11-04T15:48:36-05:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Do mightMatchLater correctlier.
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<h4>3 changed files:</h4>
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<a href="#84c9d3ba34173297e7d7747e02caa2e004b164fc">
compiler/GHC/Core/Type.hs
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<a href="#89a2e0e1a3095c7a42b10f2819049908908080e8">
compiler/GHC/Core/Unify.hs
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<a href="#0c6b585a8a21f8340a85ca2cef89c4b1bf5a8953">
compiler/GHC/Tc/Solver/Monad.hs
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<h4>Changes:</h4>
<li id="84c9d3ba34173297e7d7747e02caa2e004b164fc">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5a9c493677d0ccbab27eaa467a0b095dbd6daef1#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">@@ -156,7 +156,7 @@ module GHC.Core.Type (</td>
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156
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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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<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="LC159" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">anyFreeVarsOfType</span><span class="p">,</span><span class="idiff left"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">anyFreeVarsOfTypes</span></span><span class="p"><span class="idiff right">,</span></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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<li id="89a2e0e1a3095c7a42b10f2819049908908080e8">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5a9c493677d0ccbab27eaa467a0b095dbd6daef1#89a2e0e1a3095c7a42b10f2819049908908080e8"><strong>compiler/GHC/Core/Unify.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1790" 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">@@ -1790,9 +1790,9 @@ flattenTys is defined here because of module dependencies.</td>
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1790
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<pre style="margin: 0;"> <span id="LC1790" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;"> <span id="LC1791" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1792" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">FlattenEnv</span></span>
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<pre style="margin: 0;">-<span id="LC1793" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FlattenEnv</span> <span class="p">{</span> <span class="n" style="color: #333;">fe_type_map</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TypeMap</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">TyVar</span></span></span>
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<pre style="margin: 0;">+<span id="LC1793" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FlattenEnv</span> <span class="p">{</span> <span class="n" style="color: #333;">fe_type_map</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TypeMap</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TyVar</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TyCon</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Type</span></span><span class="p"><span class="idiff right">])</span></span></span>
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1794
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<pre style="margin: 0;"> <span id="LC1794" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- domain: exactly-saturated type family applications</span></span>
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1795
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<pre style="margin: 0;">-<span id="LC1795" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- range: <span class="idiff left right">fresh variables</span></span></span>
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<pre style="margin: 0;">+<span id="LC1795" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- range: <span class="idiff left right">(fresh variable, type family tycon, args)</span></span></span>
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<pre style="margin: 0;"> <span id="LC1796" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fe_in_scope</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">InScopeSet</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1797" 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="LC1798" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1808,15 +1808,26 @@ flattenTys :: InScopeSet -> [Type] -> [Type]</td>
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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="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;">TyVar<span class="idiff left right">Set</span></span><span class="p">)</span></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;">TyVar<span class="idiff left">Env</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TyCon</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Type</span></span><span class="p"><span class="idiff right">])</span>)</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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<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="LC1814" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- in the domain of the returned env, whose range includes</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;">-- the original type family applications. Building a substitution</span></span>
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<pre style="margin: 0;">+<span id="LC1816" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- from this information and applying it would yield the original</span></span>
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<pre style="margin: 0;">+<span id="LC1817" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- types -- almost. The problem is that the original type might</span></span>
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<pre style="margin: 0;">+<span id="LC1818" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- have something like (forall b. F a b); the returned environment</span></span>
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<pre style="margin: 0;">+<span id="LC1819" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- can't really sensibly refer to that b. So it may include a locally-</span></span>
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<pre style="margin: 0;">+<span id="LC1820" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- bound tyvar in its range. Currently, the only usage of this env't</span></span>
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<pre style="margin: 0;">+<span id="LC1821" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- checks whether there are any meta-variables in it</span></span>
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<pre style="margin: 0;">+<span id="LC1822" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (in GHC.Tc.Solver.Monad.mightMatchLater), so this is all OK.</span></span>
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<pre style="margin: 0;"> <span id="LC1823" 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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1824
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<pre style="margin: 0;"> <span id="LC1824" 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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1819
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<td class="diff-line-num new_line old" data-linenumber="1825" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="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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1825
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<pre style="margin: 0;">+<span id="LC1825" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">result</span><span class="p">,</span> <span class="n" style="color: #333;">build_env</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>
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1826
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<pre style="margin: 0;">+<span id="LC1826" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1827
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<pre style="margin: 0;">+<span id="LC1827" class="line" lang="haskell"> <span class="n" style="color: #333;">build_env</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TypeMap</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">])</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyVarEnv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyCon</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">])</span></span>
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1828
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<pre style="margin: 0;">+<span id="LC1828" class="line" lang="haskell"> <span class="n" style="color: #333;">build_env</span> <span class="n" style="color: #333;">env_in</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1829" 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">
1829
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<pre style="margin: 0;">+<span id="LC1829" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldTM</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">(</span><span class="n" style="color: #333;">tv</span><span class="p">,</span> <span class="n" style="color: #333;">tc</span><span class="p">,</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span> <span class="n" style="color: #333;">env_out</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">extendVarEnv</span> <span class="n" style="color: #333;">env_out</span> <span class="n" style="color: #333;">tv</span> <span class="p">(</span><span class="n" style="color: #333;">tc</span><span class="p">,</span> <span class="n" style="color: #333;">tys</span><span class="p">))</span></span>
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1830
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<pre style="margin: 0;">+<span id="LC1830" class="line" lang="haskell"> <span class="n" style="color: #333;">env_in</span> <span class="n" style="color: #333;">emptyVarEnv</span></span>
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1820
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1831
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<pre style="margin: 0;"> <span id="LC1831" class="line" lang="haskell"></span>
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1821
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1832
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<pre style="margin: 0;"> <span id="LC1832" 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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1833
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<pre style="margin: 0;"> <span id="LC1833" 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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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1899" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1910" 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">@@ -1899,15 +1910,17 @@ coreFlattenTyFamApp :: TvSubstEnv -> FlattenEnv</td>
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1899
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1910
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<pre style="margin: 0;"> <span id="LC1910" 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;">FlattenEnv</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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1900
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1911
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<pre style="margin: 0;"> <span id="LC1911" class="line" lang="haskell"><span class="n" style="color: #333;">coreFlattenTyFamApp</span> <span class="n" style="color: #333;">tv_subst</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">fam_args</span></span>
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1901
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<td class="diff-line-num new_line" data-linenumber="1912" 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">
1912
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<pre style="margin: 0;"> <span id="LC1912" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lookupTypeMap</span> <span class="n" style="color: #333;">type_map</span> <span class="n" style="color: #333;">fam_ty</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1902
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<pre style="margin: 0;">-<span id="LC1902" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">env'</span><span class="p">,</span> <span class="n" style="color: #333;">mkAppTys</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span> <span class="n" style="color: #333;">leftover_args'</span><span class="p">)</span></span>
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1903
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<pre style="margin: 0;">-<span id="LC1903" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">tyvar_name</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkFlattenFreshTyName</span> <span class="n" style="color: #333;">fam_tc</span></span>
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1904
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<pre style="margin: 0;">-<span id="LC1904" class="line" lang="haskell"> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">uniqAway</span> <span class="n" style="color: #333;">in_scope</span> <span class="o" style="font-weight: 600;">$</span></span>
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1905
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<pre style="margin: 0;">-<span id="LC1905" class="line" lang="haskell"> <span class="n" style="color: #333;">mkTyVar</span> <span class="n" style="color: #333;">tyvar_name</span> <span class="p">(</span><span class="n" style="color: #333;">typeKind</span> <span class="n" style="color: #333;">fam_ty</span><span class="p">)</span></span>
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1906
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<pre style="margin: 0;">-<span id="LC1906" class="line" lang="haskell"></span>
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1907
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<pre style="margin: 0;">-<span id="LC1907" class="line" lang="haskell"> <span class="n" style="color: #333;">ty'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkAppTys</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span> <span class="n" style="color: #333;">leftover_args'</span></span>
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1908
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<pre style="margin: 0;">-<span id="LC1908" class="line" lang="haskell"> <span class="n" style="color: #333;">env''</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">env'</span> <span class="p">{</span> <span class="n" style="color: #333;">fe_type_map</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendTypeMap</span> <span class="n" style="color: #333;">type_map</span> <span class="n" style="color: #333;">fam_ty</span> <span class="n" style="color: #333;">tv</span></span>
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1909
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<pre style="margin: 0;">-<span id="LC1909" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fe_in_scope</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendInScopeSet</span> <span class="n" style="color: #333;">in_scope</span> <span class="n" style="color: #333;">tv</span> <span class="p">}</span></span>
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1910
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<pre style="margin: 0;">-<span id="LC1910" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="p">(</span><span class="n" style="color: #333;">env''</span><span class="p">,</span> <span class="n" style="color: #333;">ty'</span><span class="p">)</span></span>
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1913
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<pre style="margin: 0;">+<span id="LC1913" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">tv</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="p">(</span><span class="n" style="color: #333;">env'</span><span class="p">,</span> <span class="n" style="color: #333;">mkAppTys</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span> <span class="n" style="color: #333;">leftover_args'</span><span class="p">)</span></span>
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1914
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<pre style="margin: 0;">+<span id="LC1914" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span></span>
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1915
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<pre style="margin: 0;">+<span id="LC1915" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">tyvar_name</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkFlattenFreshTyName</span> <span class="n" style="color: #333;">fam_tc</span></span>
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1916
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<pre style="margin: 0;">+<span id="LC1916" class="line" lang="haskell"> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">uniqAway</span> <span class="n" style="color: #333;">in_scope</span> <span class="o" style="font-weight: 600;">$</span></span>
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1917
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<pre style="margin: 0;">+<span id="LC1917" class="line" lang="haskell"> <span class="n" style="color: #333;">mkTyVar</span> <span class="n" style="color: #333;">tyvar_name</span> <span class="p">(</span><span class="n" style="color: #333;">typeKind</span> <span class="n" style="color: #333;">fam_ty</span><span class="p">)</span></span>
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1918
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<pre style="margin: 0;">+<span id="LC1918" class="line" lang="haskell"></span>
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1919
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<pre style="margin: 0;">+<span id="LC1919" class="line" lang="haskell"> <span class="n" style="color: #333;">ty'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkAppTys</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span> <span class="n" style="color: #333;">leftover_args'</span></span>
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1920
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<pre style="margin: 0;">+<span id="LC1920" class="line" lang="haskell"> <span class="n" style="color: #333;">env''</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">env'</span> <span class="p">{</span> <span class="n" style="color: #333;">fe_type_map</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendTypeMap</span> <span class="n" style="color: #333;">type_map</span> <span class="n" style="color: #333;">fam_ty</span></span>
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1921
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<pre style="margin: 0;">+<span id="LC1921" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">tv</span><span class="p">,</span> <span class="n" style="color: #333;">fam_tc</span><span class="p">,</span> <span class="n" style="color: #333;">sat_fam_args</span><span class="p">)</span></span>
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1922
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<pre style="margin: 0;">+<span id="LC1922" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fe_in_scope</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendInScopeSet</span> <span class="n" style="color: #333;">in_scope</span> <span class="n" style="color: #333;">tv</span> <span class="p">}</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1923" 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">
1923
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<pre style="margin: 0;">+<span id="LC1923" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="p">(</span><span class="n" style="color: #333;">env''</span><span class="p">,</span> <span class="n" style="color: #333;">ty'</span><span class="p">)</span></span>
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1911
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1924
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<pre style="margin: 0;"> <span id="LC1924" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1912
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1925
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<pre style="margin: 0;"> <span id="LC1925" class="line" lang="haskell"> <span class="n" style="color: #333;">arity</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyConArity</span> <span class="n" style="color: #333;">fam_tc</span></span>
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1913
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1926
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<pre style="margin: 0;"> <span id="LC1926" class="line" lang="haskell"> <span class="n" style="color: #333;">tcv_subst</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="p">(</span><span class="n" style="color: #333;">fe_in_scope</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">tv_subst</span> <span class="n" style="color: #333;">emptyVarEnv</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5a9c493677d0ccbab27eaa467a0b095dbd6daef1#0c6b585a8a21f8340a85ca2cef89c4b1bf5a8953"><strong>compiler/GHC/Tc/Solver/Monad.hs</strong></a>
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1
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE CPP, DeriveFunctor, TypeFamilies, ScopedTypeVariables #-}</span></span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# OPTIONS_GHC -Wno-incomplete-record-updates #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# OPTIONS_GHC -Wno-incomplete-record-updates <span class="idiff left right">-Wno-incomplete-uni-patterns </span>#-}</span></span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="haskell"><span class="cd">-- | Type definitions for the constraint solver</span></span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.Tc.Solver.Monad</span> <span class="p">(</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2129,25 +2129,20 @@ mightMatchLater given_pred given_loc wanted_pred wanted_loc</td>
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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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2131
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<pre style="margin: 0;"> <span id="LC2131" class="line" lang="haskell"></span>
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2132
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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;"><span class="idiff left">flattened_given</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">flattened_wanted</span></span></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="p"><span class="idiff left">[</span></span><span class="n" style="color: #333;"><span class="idiff">flattened_given</span></span><span class="p"><span class="idiff">]</span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="n" style="color: #333;"><span class="idiff">flattened_wanted</span></span><span class="p"><span class="idiff right">]</span></span></span>
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2133
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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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2136
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2136
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<pre style="margin: 0;"> <span id="LC2136" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="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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<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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2138
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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;">$</span> <span class="n" style="color: #333;">tyCoVarsOfType</span> <span class="n" style="color: #333;">given_pred</span></span>
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2139
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<pre style="margin: 0;">-<span id="LC2139" class="line" lang="haskell"> <span class="n" style="color: #333;">wanted_in_scope</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkInScopeSet</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tyCoVarsOfType</span> <span class="n" style="color: #333;">wanted_pred</span></span>
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<pre style="margin: 0;">+<span id="LC2138" class="line" lang="haskell"> <span class="n" style="color: #333;">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;">tyCoVarsOfTypes</span> <span class="p">[</span><span class="n" style="color: #333;">given_pred</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="LC2139" class="line" lang="haskell"></span>
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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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<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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<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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<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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<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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<pre style="margin: 0;">-<span id="LC2146" class="line" lang="haskell"></span>
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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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<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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<pre style="margin: 0;">-<span id="LC2149" class="line" lang="haskell"></span>
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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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<pre style="margin: 0;">+<span id="LC2140" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: flatten both at the same time, so that we can share mappings</span></span>
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<pre style="margin: 0;">+<span id="LC2141" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- from type family applications to variables, and also to guarantee</span></span>
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<pre style="margin: 0;">+<span id="LC2142" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- that the fresh variables are really fresh between the given and</span></span>
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<pre style="margin: 0;">+<span id="LC2143" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the wanted.</span></span>
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<pre style="margin: 0;">+<span id="LC2144" 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;">flattened_wanted</span><span class="p">],</span> <span class="n" style="color: #333;">var_mapping</span><span class="p">)</span></span>
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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="n" style="color: #333;">flattenTysX</span> <span class="n" style="color: #333;">in_scope</span> <span class="p">[</span><span class="n" style="color: #333;">given_pred</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="LC2146" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2147" 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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<pre style="margin: 0;"> <span id="LC2148" 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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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2156,12 +2151,17 @@ mightMatchLater given_pred given_loc wanted_pred wanted_loc</td>
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<pre style="margin: 0;"> <span id="LC2151" 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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<pre style="margin: 0;"> <span id="LC2152" 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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<pre style="margin: 0;"> <span id="LC2153" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in GHC.Tc.Solver.Interact</span></span>
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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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<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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<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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2154
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<pre style="margin: 0;">+<span id="LC2154" 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;">is_meta_tv</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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<pre style="margin: 0;">+<span id="LC2155" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2156" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">_fam_tc</span><span class="p">,</span> <span class="n" style="color: #333;">fam_args</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupVarEnv</span> <span class="n" style="color: #333;">var_mapping</span> <span class="n" style="color: #333;">tv</span></span>
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2157
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<pre style="margin: 0;">+<span id="LC2157" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">anyFreeVarsOfTypes</span> <span class="n" style="color: #333;">is_meta_tv</span> <span class="n" style="color: #333;">fam_args</span></span>
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<pre style="margin: 0;">+<span id="LC2158" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">BindMe</span></span>
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<pre style="margin: 0;">+<span id="LC2159" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2160" 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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<pre style="margin: 0;">+<span id="LC2161" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2162" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- CycleBreakerTvs really stands for a type family application in</span></span>
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<pre style="margin: 0;">+<span id="LC2163" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- a given; these won't contain touchable meta-variables</span></span>
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<pre style="margin: 0;">+<span id="LC2164" class="line" lang="haskell"> <span class="n" style="color: #333;">is_meta_tv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isMetaTyVar</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="n" style="color: #333;">isCycleBreakerTyVar</span></span>
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<pre style="margin: 0;"> <span id="LC2165" class="line" lang="haskell"></span>
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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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<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">@@ -2187,30 +2187,21 @@ in the Wanted might be arbitrarily instantiated. We do *not* want</td>
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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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<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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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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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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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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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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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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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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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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<td class="diff-line-num new new_line" data-linenumber="2190" 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">
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;">To allow flexibility in how type family applications unify we use</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;">the Core flattener. See Note [Flattening] in GHC.Core.Unify.</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2192" 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">
2192
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<pre style="margin: 0;">+<span id="LC2192" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This is *distinct* from the flattener in GHC.Tc.Solver.Flatten.</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2193" 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">
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;">The Core flattener replaces all type family applications with</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2194" 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">
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;">fresh variables. The next question: should we allow these fresh</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2195" 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">
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;">variables in the domian of a unifying substitution?</span></span>
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2196
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<pre style="margin: 0;">+<span id="LC2196" class="line" lang="haskell"></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;">A type family application that mentions only skolems is settled: any</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2198" 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">
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;">skolems would have been rewritten w.r.t. Givens by now. These type</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;">family applications match only themselves. A type family application</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;">that mentions metavariables, on the other hand, can match anything.</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2201" 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">
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;">So, if the original type family application contains a metavariable,</span></span>
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2202
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<pre style="margin: 0;">+<span id="LC2202" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we use BindMe to tell the unifier to allow it in the substitution.</span></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;">On the other hand, a type family application with only skolems is</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;">considered rigid.</span></span>
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2214
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2205
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<pre style="margin: 0;"> <span id="LC2205" class="line" lang="haskell"></span>
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2215
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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;">Note [When does an implication have given equalities?]</span></span>
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2216
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2207
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<pre style="margin: 0;"> <span id="LC2207" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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