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<h3>
Richard Eisenberg pushed to branch wip/cfuneqcan-refactor
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<ul>
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b90a27cea352ec6645bfc0e1aee5f72e631fbfeb">b90a27ce</a></strong>
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<span>by Richard Eisenberg</span>
<i>at 2020-11-11T13:00:33-05:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Address points from Hécate.
</pre>
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/78425e2e6d50575111568a2e6f9d8e7f7e8bae22">78425e2e</a></strong>
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<span>by Richard Eisenberg</span>
<i>at 2020-11-11T18:01:57-05:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Reviews on GitLab
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<h4>14 changed files:</h4>
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<li class="file-stats">
<a href="#783e5dae6e86931f06700fc088fb7d48c8a07386">
compiler/GHC/Core/Coercion.hs
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<li class="file-stats">
<a href="#91648438362e5a35363d2bb7abb04016dedd7d7e">
compiler/GHC/Core/FamInstEnv.hs
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<li class="file-stats">
<a href="#5596bb0f228bd2a308c4391df97375ae879430a8">
compiler/GHC/Core/InstEnv.hs
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<li class="file-stats">
<a href="#4aad0050db1a8a20db8bbca149111de99cb299c9">
compiler/GHC/Core/TyCon.hs
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<li class="file-stats">
<a href="#89a2e0e1a3095c7a42b10f2819049908908080e8">
compiler/GHC/Core/Unify.hs
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<a href="#9355bef855426caf5f526925edf351b20f9a86c4">
compiler/GHC/Tc/Gen/HsType.hs
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<li class="file-stats">
<a href="#3ee8be814b6c6727880deab3772e6af922524bf0">
compiler/GHC/Tc/Gen/Pat.hs
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<li class="file-stats">
<a href="#f018e77421f495c6f75733fee4a511cfe57bebe8">
compiler/GHC/Tc/Solver/Canonical.hs
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<a href="#81707f1fe21087531cefd70879aa09c2be5c1d22">
compiler/GHC/Tc/Solver/Flatten.hs
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<a href="#f639b0b31b7245cb7d34ac190b798f5ec1c7da2e">
compiler/GHC/Tc/Solver/Interact.hs
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<a href="#0c6b585a8a21f8340a85ca2cef89c4b1bf5a8953">
compiler/GHC/Tc/Solver/Monad.hs
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<li class="file-stats">
<a href="#3b6d78a50c8462304f843b952a88e531718dbbd2">
compiler/GHC/Tc/Types/Constraint.hs
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<li class="file-stats">
<a href="#94c96afe1bb3b771ffbcfeeca34ce43ebbe76ccb">
compiler/GHC/Tc/Utils/TcMType.hs
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<li class="file-stats">
<a href="#74295edeac870ee7f2f3484ebaffab5c948b735a">
compiler/GHC/Tc/Utils/Unify.hs
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<h4>Changes:</h4>
<li id="783e5dae6e86931f06700fc088fb7d48c8a07386">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/ef7479323a85c965b50fb2dfd71f537872cedab1...78425e2e6d50575111568a2e6f9d8e7f7e8bae22#783e5dae6e86931f06700fc088fb7d48c8a07386"><strong>compiler/GHC/Core/Coercion.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2659,7 +2659,8 @@ FamInstEnv, and so lives here.</td>
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<pre style="margin: 0;"> <span id="LC2659" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2660" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [simplifyArgsWorker]</span></span>
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<td class="diff-line-num new_line" data-linenumber="2661" 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="LC2661" 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="LC2662" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Invariant (F2) of Note [Flattening] says that flattening is homogeneous.</span></span>
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<td class="diff-line-num new old_line" data-linenumber="2663" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC2662" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Invariant (F2) of Note [Flattening] in GHC.Tc.Solver.Flatten says that</span></span>
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<pre style="margin: 0;">+<span id="LC2663" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">flattening is homogeneous.</span></span>
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<pre style="margin: 0;"> <span id="LC2664" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This causes some trouble when flattening a function applied to a telescope</span></span>
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<pre style="margin: 0;"> <span id="LC2665" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of arguments, perhaps with dependency. For example, suppose</span></span>
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<pre style="margin: 0;"> <span id="LC2666" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/ef7479323a85c965b50fb2dfd71f537872cedab1...78425e2e6d50575111568a2e6f9d8e7f7e8bae22#91648438362e5a35363d2bb7abb04016dedd7d7e"><strong>compiler/GHC/Core/FamInstEnv.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="428" 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">@@ -428,7 +428,8 @@ Here is how we do it:</td>
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<pre style="margin: 0;"> <span id="LC428" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">apart(target, pattern) = not (unify(flatten(target), pattern))</span></span>
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<pre style="margin: 0;"> <span id="LC429" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC430" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">where flatten (implemented in flattenTys, below) converts all type-family</span></span>
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<pre style="margin: 0;">-<span id="LC431" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">applications into fresh variables. (See Note [Flattening] in GHC.Core.Unify.)</span></span>
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<pre style="margin: 0;">+<span id="LC431" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">applications into fresh variables. (See</span></span>
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<pre style="margin: 0;">+<span id="LC432" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Flattening type-family applications when matching instances] in GHC.Core.Unify.)</span></span>
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<pre style="margin: 0;"> <span id="LC433" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC434" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Compatibility]</span></span>
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<pre style="margin: 0;"> <span id="LC435" 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">@@ -1176,7 +1177,8 @@ findBranch branches target_tys</td>
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<pre style="margin: 0;"> <span id="LC1177" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cab_incomps</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">incomps</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">branch</span></span>
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1177
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1178
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<pre style="margin: 0;"> <span id="LC1178" 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="p">(</span><span class="n" style="color: #333;">unionVarSets</span> <span class="o" style="font-weight: 600;">$</span></span>
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1178
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1179
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<pre style="margin: 0;"> <span id="LC1179" class="line" lang="haskell"> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">tyCoVarsOfTypes</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">coAxBranchLHS</span><span class="p">)</span> <span class="n" style="color: #333;">incomps</span><span class="p">)</span></span>
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1179
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<pre style="margin: 0;">-<span id="LC1179" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Flattening] in GHC.Core.Unify</span></span>
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<pre style="margin: 0;">+<span id="LC1180" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Flattening type-family applications when matching instances]</span></span>
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<pre style="margin: 0;">+<span id="LC1181" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in GHC.Core.Unify</span></span>
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1180
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1182
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<pre style="margin: 0;"> <span id="LC1182" class="line" lang="haskell"> <span class="n" style="color: #333;">flattened_target</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">flattenTys</span> <span class="n" style="color: #333;">in_scope</span> <span class="n" style="color: #333;">target_tys</span></span>
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1181
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1183
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<pre style="margin: 0;"> <span id="LC1183" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">tcMatchTys</span> <span class="n" style="color: #333;">tpl_lhs</span> <span class="n" style="color: #333;">target_tys</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1182
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1184
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<pre style="margin: 0;"> <span id="LC1184" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">subst</span> <span class="c1" style="color: #998; font-style: italic;">-- matching worked. now, check for apartness.</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">@@ -1193,11 +1195,11 @@ findBranch branches target_tys</td>
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1193
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1195
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<pre style="margin: 0;"> <span id="LC1195" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (POPL '14). This should be used when determining if an equation</span></span>
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1194
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1196
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<pre style="margin: 0;"> <span id="LC1196" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ('CoAxBranch') of a closed type family can be used to reduce a certain target</span></span>
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1197
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<pre style="margin: 0;"> <span id="LC1197" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- type family application.</span></span>
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<pre style="margin: 0;">-<span id="LC1196" class="line" lang="haskell"><span class="n" style="color: #333;">apartnessCheck</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="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- ^ /flattened/ target arguments. Make sure</span></span></span>
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1197
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<pre style="margin: 0;">-<span id="LC1197" class="line" lang="haskell"> <span class="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- they're flattened! See Note [Flattening]</span></span></span>
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1198
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<pre style="margin: 0;">-<span id="LC1198" class="line" lang="haskell"> <span class="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- in GHC.Core.Unify</span></span></span>
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1199
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<pre style="margin: 0;">-<span id="LC1199" class="line" lang="haskell"> <span class="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">--</span> (NB: This "flat" is a different</span></span>
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<pre style="margin: 0;">-<span id="LC1200" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="c1" style="color: #998; font-style: italic;">-- "flat" than is used in GHC.Tc.Solver.Flatten.)</span></span>
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<pre style="margin: 0;">+<span id="LC1198" class="line" lang="haskell"><span class="n" style="color: #333;">apartnessCheck</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="LC1199" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">-- ^ /flattened/ target arguments. Make sure they're flattened! See</span></span></span>
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<pre style="margin: 0;">+<span id="LC1200" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">-- Note [Flattening type-family applications when matching instances]</span></span></span>
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<pre style="margin: 0;">+<span id="LC1201" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">-- in GHC.Core.Unify.</span> (NB: This "flat" is a different</span></span>
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<pre style="margin: 0;">+<span id="LC1202" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- "flat" than is used in GHC.Tc.Solver.Flatten.)</span></span>
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<pre style="margin: 0;"> <span id="LC1203" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoAxBranch</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ the candidate equation we wish to use</span></span>
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<pre style="margin: 0;"> <span id="LC1204" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Precondition: this matches the target</span></span>
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<pre style="margin: 0;"> <span id="LC1205" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ True <=> equation can fire</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/ef7479323a85c965b50fb2dfd71f537872cedab1...78425e2e6d50575111568a2e6f9d8e7f7e8bae22#5596bb0f228bd2a308c4391df97375ae879430a8"><strong>compiler/GHC/Core/InstEnv.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">@@ -840,6 +840,8 @@ lookupInstEnv' ie vis_mods cls tys</td>
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<pre style="margin: 0;"> <span id="LC840" class="line" lang="haskell"> <span class="n" style="color: #333;">flattened_tys</span> <span class="o" style="font-weight: 600;">=</span> <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="kr" style="font-weight: 600;">in</span></span>
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<pre style="margin: 0;"> <span id="LC841" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: important to flatten here. Otherwise, it looks like</span></span>
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<pre style="margin: 0;"> <span id="LC842" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- instance C Int cannot match a target [W] C (F Bool).</span></span>
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<pre style="margin: 0;">+<span id="LC843" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Flattening type-family applications when matching instances]</span></span>
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<pre style="margin: 0;">+<span id="LC844" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in GHC.Core.Unify.</span></span>
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<pre style="margin: 0;"> <span id="LC845" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">tcUnifyTysFG</span> <span class="n" style="color: #333;">instanceBindFun</span> <span class="n" style="color: #333;">tpl_tys</span> <span class="n" style="color: #333;">flattened_tys</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC846" class="line" lang="haskell"> <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;">find</span> <span class="n" style="color: #333;">ms</span> <span class="n" style="color: #333;">us</span> <span class="n" style="color: #333;">rest</span></span>
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<pre style="margin: 0;"> <span id="LC847" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">find</span> <span class="n" style="color: #333;">ms</span> <span class="p">(</span><span class="n" style="color: #333;">item</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">us</span><span class="p">)</span> <span class="n" style="color: #333;">rest</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">@@ -1029,20 +1031,26 @@ When looking up in the instance environment, or family-instance environment,</td>
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<pre style="margin: 0;"> <span id="LC1031" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we are careful about multiple matches, as described above in</span></span>
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<pre style="margin: 0;"> <span id="LC1032" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Overlapping instances]</span></span>
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<pre style="margin: 0;"> <span id="LC1033" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1032" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The key_tys can contain skolem constants, and we can guarantee that those</span></span>
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<pre style="margin: 0;">+<span id="LC1034" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The target tys can contain skolem constants. For existentials and instance variables,</span></span>
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<pre style="margin: 0;">+<span id="LC1035" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we can guarantee that those</span></span>
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<pre style="margin: 0;"> <span id="LC1036" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">are never going to be instantiated to anything, so we should not involve</span></span>
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1034
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<pre style="margin: 0;">-<span id="LC1034" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">them in the unification test. Example:</span></span>
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1037
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<pre style="margin: 0;">+<span id="LC1037" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">them in the unification test. <span class="idiff left right">These are called "super skolems".</span> Example:</span></span>
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1035
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1038
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<pre style="margin: 0;"> <span id="LC1038" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> class Foo a where { op :: a -> Int }</span></span>
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1036
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1039
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<pre style="margin: 0;"> <span id="LC1039" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance Foo a => Foo [a] -- NB overlap</span></span>
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1037
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1040
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<pre style="margin: 0;"> <span id="LC1040" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance Foo [Int] -- NB overlap</span></span>
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1038
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1041
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<pre style="margin: 0;"> <span id="LC1041" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T = forall a. Foo a => MkT a</span></span>
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1039
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1042
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<pre style="margin: 0;"> <span id="LC1042" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: T -> Int</span></span>
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1040
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1043
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<pre style="margin: 0;"> <span id="LC1043" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f (MkT x) = op [x,x]</span></span>
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1041
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<pre style="margin: 0;">-<span id="LC1041" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The op [x,x] means we need (Foo [a]). Without the filterVarSet we'd</span></span>
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1042
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<pre style="margin: 0;">-<span id="LC1042" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">complain, saying that the choice of instance depended on the instantiation</span></span>
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1043
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<pre style="margin: 0;">-<span id="LC1043" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of 'a'; but of course it isn't *going* to be instantiated.</span></span>
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1044
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<pre style="margin: 0;">-<span id="LC1044" class="line" lang="haskell"></span>
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1045
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<pre style="margin: 0;">-<span id="LC1045" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We do this only for isOverlappableTyVar skolems. For example we reject</span></span>
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1044
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<pre style="margin: 0;">+<span id="LC1044" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The op [x,x] means we need (Foo [a]). This `a` will never be instantiated, and</span></span>
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1045
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<pre style="margin: 0;">+<span id="LC1045" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">so it is a super skolem. (See the use of tcInstSuperSkolTyVarsX in</span></span>
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1046
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<pre style="margin: 0;">+<span id="LC1046" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC.Tc.Gen.Pat.tcDataConPat.) Super skolems respond True to</span></span>
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1047
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<pre style="margin: 0;">+<span id="LC1047" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">isOverlappableTyVar, and the use of Skolem in instanceBindFun, above, means</span></span>
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1048
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<pre style="margin: 0;">+<span id="LC1048" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that these will be treated as fresh constants in the unification algorithm</span></span>
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1049
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<pre style="margin: 0;">+<span id="LC1049" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">during instance lookup. Without this treatment, GHC would complain, saying</span></span>
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1050
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<pre style="margin: 0;">+<span id="LC1050" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that the choice of instance depended on the instantiation of 'a'; but of</span></span>
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1051
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<pre style="margin: 0;">+<span id="LC1051" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">course it isn't *going* to be instantiated.</span></span>
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1052
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<pre style="margin: 0;">+<span id="LC1052" class="line" lang="haskell"></span>
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1053
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<pre style="margin: 0;">+<span id="LC1053" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We do this only for super skolems. For example we reject</span></span>
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1046
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1054
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<pre style="margin: 0;"> <span id="LC1054" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g :: forall a => [a] -> Int</span></span>
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<pre style="margin: 0;"> <span id="LC1055" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g x = op x</span></span>
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<pre style="margin: 0;"> <span id="LC1056" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">on the grounds that the correct instance depends on the instantiation of 'a'</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/ef7479323a85c965b50fb2dfd71f537872cedab1...78425e2e6d50575111568a2e6f9d8e7f7e8bae22#4aad0050db1a8a20db8bbca149111de99cb299c9"><strong>compiler/GHC/Core/TyCon.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">@@ -821,8 +821,11 @@ data TyCon</td>
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<pre style="margin: 0;"> <span id="LC821" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- any type synonym families (data families</span></span>
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822
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<pre style="margin: 0;"> <span id="LC822" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- are fine), again after expanding any</span></span>
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823
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<pre style="margin: 0;"> <span id="LC823" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- nested synonyms</span></span>
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<pre style="margin: 0;">-<span id="LC824" class="line" lang="haskell"> <span class="n" style="color: #333;">synIsForgetful</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="c1" style="color: #998; font-style: italic;">-- True <=> at least one argument is not mentioned</span></span>
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<pre style="margin: 0;">-<span id="LC825" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in the RHS</span></span>
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<pre style="margin: 0;">+<span id="LC824" class="line" lang="haskell"> <span class="n" style="color: #333;">synIsForgetful</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="c1" style="color: #998; font-style: italic;">-- True <= at least one argument is not mentioned</span></span>
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<pre style="margin: 0;">+<span id="LC825" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in the RHS (or is mentioned only under</span></span>
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<pre style="margin: 0;">+<span id="LC826" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- forgetful synonyms)</span></span>
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<pre style="margin: 0;">+<span id="LC827" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Test is conservative, so True does not guarantee</span></span>
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<pre style="margin: 0;">+<span id="LC828" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- forgetfulness.</span></span>
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<pre style="margin: 0;"> <span id="LC829" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC830" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC831" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- | Represents families (both type and data)</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">@@ -2056,7 +2059,11 @@ isFamFreeTyCon (SynonymTyCon { synIsFamFree = fam_free }) = fam_free</td>
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<pre style="margin: 0;"> <span id="LC2059" class="line" lang="haskell"><span class="n" style="color: #333;">isFamFreeTyCon</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FamilyTyCon</span> <span class="p">{</span> <span class="n" style="color: #333;">famTcFlav</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">flav</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isDataFamFlav</span> <span class="n" style="color: #333;">flav</span></span>
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2057
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<pre style="margin: 0;"> <span id="LC2060" class="line" lang="haskell"><span class="n" style="color: #333;">isFamFreeTyCon</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;">True</span></span>
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<pre style="margin: 0;"> <span id="LC2061" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2059" class="line" lang="haskell"><span class="cd">-- | Is this a forgetful type synonym?</span></span>
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<pre style="margin: 0;">+<span id="LC2062" class="line" lang="haskell"><span class="cd">-- | Is this a forgetful type synonym? If this is a type synonym whose</span></span>
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<pre style="margin: 0;">+<span id="LC2063" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- RHS does not mention one (or more) of its bound variables, returns</span></span>
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2064
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<pre style="margin: 0;">+<span id="LC2064" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- True. Thus, False means that all bound variables appear on the RHS;</span></span>
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2065
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<pre style="margin: 0;">+<span id="LC2065" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- True may not mean anything, as the test to set this flag is</span></span>
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2066
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<pre style="margin: 0;">+<span id="LC2066" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- conservative.</span></span>
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2060
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2067
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<pre style="margin: 0;"> <span id="LC2067" class="line" lang="haskell"><span class="n" style="color: #333;">isForgetfulSynTyCon</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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2061
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2068
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<pre style="margin: 0;"> <span id="LC2068" class="line" lang="haskell"><span class="n" style="color: #333;">isForgetfulSynTyCon</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SynonymTyCon</span> <span class="p">{</span> <span class="n" style="color: #333;">synIsForgetful</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">forget</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">forget</span></span>
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2062
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2069
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<pre style="margin: 0;"> <span id="LC2069" class="line" lang="haskell"><span class="n" style="color: #333;">isForgetfulSynTyCon</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/ef7479323a85c965b50fb2dfd71f537872cedab1...78425e2e6d50575111568a2e6f9d8e7f7e8bae22#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">@@ -719,8 +719,9 @@ unifier It does /not/ work up to ~.</td>
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<pre style="margin: 0;"> <span id="LC719" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The algorithm implemented here is rather delicate, and we depend on it</span></span>
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<pre style="margin: 0;"> <span id="LC720" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to uphold certain properties. This is a summary of these required</span></span>
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721
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<pre style="margin: 0;"> <span id="LC721" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">properties. Any reference to "flattening" refers to the flattening</span></span>
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<pre style="margin: 0;">-<span id="LC722" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">algorithm in GHC.Core.FamInstEnv (See Note [Flattening] in GHC.Core.Unify), not</span></span>
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<pre style="margin: 0;">-<span id="LC723" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the flattening algorithm in the solver.</span></span>
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<pre style="margin: 0;">+<span id="LC722" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">algorithm in GHC.Core.Unify (See</span></span>
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<pre style="margin: 0;">+<span id="LC723" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Flattening type-family applications when matching instances] in GHC.Core.Unify),</span></span>
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<pre style="margin: 0;">+<span id="LC724" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">not the flattening algorithm in the solver.</span></span>
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725
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<pre style="margin: 0;"> <span id="LC725" class="line" lang="haskell"></span>
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726
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<pre style="margin: 0;"> <span id="LC726" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Notation:</span></span>
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727
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<pre style="margin: 0;"> <span id="LC727" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> θ,φ substitutions</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">@@ -1648,8 +1649,8 @@ pushRefl co =</td>
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1648
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1649
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<pre style="margin: 0;"> <span id="LC1649" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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1649
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1650
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<pre style="margin: 0;"> <span id="LC1650" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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1651
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<pre style="margin: 0;"> <span id="LC1651" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1651" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Flattening]</span></span>
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<pre style="margin: 0;">-<span id="LC1652" 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="LC1652" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Flattening<span class="idiff left right"> type-family applications when matching instances</span>]</span></span>
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<pre style="margin: 0;">+<span id="LC1653" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~<span class="idiff left right">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span></span>
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1654
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<pre style="margin: 0;"> <span id="LC1654" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">As described in "Closed type families with overlapping equations"</span></span>
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1655
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<pre style="margin: 0;"> <span id="LC1655" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">http://research.microsoft.com/en-us/um/people/simonpj/papers/ext-f/axioms-extended.pdf</span></span>
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1656
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<pre style="margin: 0;"> <span id="LC1656" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we need to flatten core types before unifying them, when checking for "surely-apart"</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">@@ -1678,6 +1679,15 @@ can see that (F x x) can reduce to Double. So, it had better be the</td>
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1679
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<pre style="margin: 0;"> <span id="LC1679" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">case that (F blah blah) can reduce to Double, no matter what (blah)</span></span>
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1680
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<pre style="margin: 0;"> <span id="LC1680" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is! Flattening as done below ensures this.</span></span>
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<pre style="margin: 0;"> <span id="LC1681" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1682" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We also use this flattening operation to check for class instances.</span></span>
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1683
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<pre style="margin: 0;">+<span id="LC1683" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If we have</span></span>
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<pre style="margin: 0;">+<span id="LC1684" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance C (Maybe b)</span></span>
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1685
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<pre style="margin: 0;">+<span id="LC1685" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance {-# OVERLAPPING #-} C (Maybe Bool)</span></span>
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<pre style="margin: 0;">+<span id="LC1686" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] C (Maybe (F a))</span></span>
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<pre style="margin: 0;">+<span id="LC1687" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we want to know that the second instance might match later. So we</span></span>
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<pre style="margin: 0;">+<span id="LC1688" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">flatten the (F a) in the target before trying to unify with instances.</span></span>
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<pre style="margin: 0;">+<span id="LC1689" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(This is done in GHC.Core.InstEnv.lookupInstEnv'.)</span></span>
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<pre style="margin: 0;">+<span id="LC1690" class="line" lang="haskell"></span>
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1681
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<pre style="margin: 0;"> <span id="LC1691" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The algorithm works by building up a TypeMap TyVar, mapping</span></span>
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1682
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1692
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<pre style="margin: 0;"> <span id="LC1692" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">type family applications to fresh variables. This mapping must</span></span>
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1683
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1693
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<pre style="margin: 0;"> <span id="LC1693" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">be threaded through all the function calls, as any entry in</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">@@ -1794,7 +1804,7 @@ data FlattenEnv</td>
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<pre style="margin: 0;"> <span id="LC1804" 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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<pre style="margin: 0;"> <span id="LC1805" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- range: (fresh variable, type family tycon, args)</span></span>
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<pre style="margin: 0;"> <span id="LC1806" 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="LC1807" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Flattening<span class="idiff left right"> type-family applications when matching instances</span>]</span></span>
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1808
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<pre style="margin: 0;"> <span id="LC1808" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1809" class="line" lang="haskell"><span class="n" style="color: #333;">emptyFlattenEnv</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="kt" style="color: #458; font-weight: 600;">FlattenEnv</span></span>
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<pre style="margin: 0;"> <span id="LC1810" class="line" lang="haskell"><span class="n" style="color: #333;">emptyFlattenEnv</span> <span class="n" style="color: #333;">in_scope</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">@@ -1805,11 +1815,11 @@ updateInScopeSet :: FlattenEnv -> (InScopeSet -> InScopeSet) -> FlattenEnv</td>
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<pre style="margin: 0;"> <span id="LC1815" class="line" lang="haskell"><span class="n" style="color: #333;">updateInScopeSet</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">upd</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_in_scope</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">upd</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="p">}</span></span>
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1816
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<pre style="margin: 0;"> <span id="LC1816" class="line" lang="haskell"></span>
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1807
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1817
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<pre style="margin: 0;"> <span id="LC1817" 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="LC1818" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Flattening<span class="idiff left right"> type-family applications when matching instances</span>]</span></span>
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1819
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<pre style="margin: 0;"> <span id="LC1819" 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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1820
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<pre style="margin: 0;"> <span id="LC1820" class="line" lang="haskell"></span>
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1811
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1821
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<pre style="margin: 0;"> <span id="LC1821" 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;">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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<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="LC1822" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Flattening<span class="idiff left right"> type-family applications when matching instances</span>]</span></span>
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1813
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1823
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<pre style="margin: 0;"> <span id="LC1823" 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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1814
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1824
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<pre style="margin: 0;"> <span id="LC1824" 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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1825
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<pre style="margin: 0;"> <span id="LC1825" 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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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1889,7 +1899,7 @@ coreFlattenCo subst env co</td>
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<pre style="margin: 0;"> <span id="LC1899" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">env1</span><span class="p">,</span> <span class="n" style="color: #333;">kind'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">coreFlattenTy</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="n" style="color: #333;">coercionType</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>
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1900
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<pre style="margin: 0;"> <span id="LC1900" class="line" lang="haskell"> <span class="n" style="color: #333;">covar</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkFlattenFreshCoVar</span> <span class="p">(</span><span class="n" style="color: #333;">fe_in_scope</span> <span class="n" style="color: #333;">env1</span><span class="p">)</span> <span class="n" style="color: #333;">kind'</span></span>
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1891
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1901
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<pre style="margin: 0;"> <span id="LC1901" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Add the covar to the FlattenEnv's in-scope set.</span></span>
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1892
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<pre style="margin: 0;">-<span id="LC1892" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Flattening], wrinkle 2A.</span></span>
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1902
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<pre style="margin: 0;">+<span id="LC1902" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Flattening<span class="idiff left right"> type-family applications when matching instances</span>], wrinkle 2A.</span></span>
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1893
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1903
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<pre style="margin: 0;"> <span id="LC1903" class="line" lang="haskell"> <span class="n" style="color: #333;">env2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">updateInScopeSet</span> <span class="n" style="color: #333;">env1</span> <span class="p">(</span><span class="n" style="color: #333;">flip</span> <span class="n" style="color: #333;">extendInScopeSet</span> <span class="n" style="color: #333;">covar</span><span class="p">)</span></span>
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1904
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<pre style="margin: 0;"> <span id="LC1904" class="line" lang="haskell"></span>
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1895
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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;">coreFlattenVarBndr</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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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1897" 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="1907" 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">@@ -1897,7 +1907,7 @@ coreFlattenVarBndr :: TvSubstEnv -> FlattenEnv</td>
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1897
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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;">coreFlattenVarBndr</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">tv</span></span>
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1898
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1908
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<pre style="margin: 0;"> <span id="LC1908" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">env2</span><span class="p">,</span> <span class="n" style="color: #333;">subst'</span><span class="p">,</span> <span class="n" style="color: #333;">tv'</span><span class="p">)</span></span>
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1899
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1909
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<pre style="margin: 0;"> <span id="LC1909" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1900
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<pre style="margin: 0;">-<span id="LC1900" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Flattening], wrinkle 2B.</span></span>
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1910
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<pre style="margin: 0;">+<span id="LC1910" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Flattening<span class="idiff left right"> type-family applications when matching instances</span>], wrinkle 2B.</span></span>
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1901
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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;">kind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">varType</span> <span class="n" style="color: #333;">tv</span></span>
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1902
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1912
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<pre style="margin: 0;"> <span id="LC1912" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">env1</span><span class="p">,</span> <span class="n" style="color: #333;">kind'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">coreFlattenTy</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">kind</span></span>
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1903
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1913
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<pre style="margin: 0;"> <span id="LC1913" 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="p">(</span><span class="n" style="color: #333;">fe_in_scope</span> <span class="n" style="color: #333;">env1</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">setVarType</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">kind'</span><span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1927" 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="1937" 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">@@ -1927,11 +1937,13 @@ coreFlattenTyFamApp tv_subst env fam_tc fam_args</td>
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1927
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1937
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<pre style="margin: 0;"> <span id="LC1937" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">sat_fam_args</span><span class="p">,</span> <span class="n" style="color: #333;">leftover_args</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">arity</span> <span class="o" style="font-weight: 600;"><=</span> <span class="n" style="color: #333;">length</span> <span class="n" style="color: #333;">fam_args</span> <span class="p">)</span></span>
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1928
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1938
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<pre style="margin: 0;"> <span id="LC1938" class="line" lang="haskell"> <span class="n" style="color: #333;">splitAt</span> <span class="n" style="color: #333;">arity</span> <span class="n" style="color: #333;">fam_args</span></span>
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1929
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1939
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<pre style="margin: 0;"> <span id="LC1939" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Apply the substitution before looking up an application in the</span></span>
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1930
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<pre style="margin: 0;">-<span id="LC1930" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- environment. See Note [Flattening], wrinkle 1.</span></span>
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<pre style="margin: 0;">+<span id="LC1940" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- environment. See Note [Flattening type-family applications when matching instances],</span></span>
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1941
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<pre style="margin: 0;">+<span id="LC1941" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- wrinkle 1.</span></span>
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1942
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<pre style="margin: 0;"> <span id="LC1942" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: substTys short-cuts the common case when the substitution is empty.</span></span>
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1932
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1943
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<pre style="margin: 0;"> <span id="LC1943" class="line" lang="haskell"> <span class="n" style="color: #333;">sat_fam_args'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substTys</span> <span class="n" style="color: #333;">tcv_subst</span> <span class="n" style="color: #333;">sat_fam_args</span></span>
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1933
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1944
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<pre style="margin: 0;"> <span id="LC1944" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">env'</span><span class="p">,</span> <span class="n" style="color: #333;">leftover_args'</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;">tv_subst</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">leftover_args</span></span>
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1934
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<pre style="margin: 0;">-<span id="LC1934" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- `fam_tc` may be over-applied to `fam_args` (see Note [Flattening],</span></span>
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1945
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<pre style="margin: 0;">+<span id="LC1945" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- `fam_tc` may be over-applied to `fam_args` (see</span></span>
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1946
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<pre style="margin: 0;">+<span id="LC1946" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Flattening type-family applications when matching instances]</span></span>
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1935
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1947
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<pre style="margin: 0;"> <span id="LC1947" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- wrinkle 3), so we split it into the arguments needed to saturate it</span></span>
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1936
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1948
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<pre style="margin: 0;"> <span id="LC1948" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (sat_fam_args') and the rest (leftover_args')</span></span>
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1937
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1949
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<pre style="margin: 0;"> <span id="LC1949" class="line" lang="haskell"> <span class="n" style="color: #333;">fam_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">sat_fam_args'</span></span>
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<li id="9355bef855426caf5f526925edf351b20f9a86c4">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/ef7479323a85c965b50fb2dfd71f537872cedab1...78425e2e6d50575111568a2e6f9d8e7f7e8bae22#9355bef855426caf5f526925edf351b20f9a86c4"><strong>compiler/GHC/Tc/Gen/HsType.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">@@ -1189,6 +1189,11 @@ tc_hs_type _ rn_ty@(HsTyLit _ (HsStrTy _ s)) exp_kind</td>
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1189
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1189
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<pre style="margin: 0;"> <span id="LC1189" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">checkWiredInTyCon</span> <span class="n" style="color: #333;">typeSymbolKindCon</span></span>
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1190
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1190
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<pre style="margin: 0;"> <span id="LC1190" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">checkExpectedKind</span> <span class="n" style="color: #333;">rn_ty</span> <span class="p">(</span><span class="n" style="color: #333;">mkStrLitTy</span> <span class="n" style="color: #333;">s</span><span class="p">)</span> <span class="n" style="color: #333;">typeSymbolKind</span> <span class="n" style="color: #333;">exp_kind</span> <span class="p">}</span></span>
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1191
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<pre style="margin: 0;"> <span id="LC1191" class="line" lang="haskell"></span>
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1192
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<pre style="margin: 0;">+<span id="LC1192" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--------- Wildcards</span></span>
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1193
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<pre style="margin: 0;">+<span id="LC1193" class="line" lang="haskell"></span>
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1194
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<pre style="margin: 0;">+<span id="LC1194" class="line" lang="haskell"><span class="n" style="color: #333;">tc_hs_type</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">ty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsWildCardTy</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="n" style="color: #333;">ek</span></span>
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1195
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<pre style="margin: 0;">+<span id="LC1195" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcAnonWildCardOcc</span> <span class="kt" style="color: #458; font-weight: 600;">NoExtraConstraint</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">ek</span></span>
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1196
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<pre style="margin: 0;">+<span id="LC1196" class="line" lang="haskell"></span>
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1192
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1197
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<pre style="margin: 0;"> <span id="LC1197" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--------- Potentially kind-polymorphic types: call the "up" checker</span></span>
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1193
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1198
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<pre style="margin: 0;"> <span id="LC1198" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Future-proofing the type checker]</span></span>
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<pre style="margin: 0;"> <span id="LC1199" class="line" lang="haskell"><span class="n" style="color: #333;">tc_hs_type</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">ty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsTyVar</span> <span class="p">{})</span> <span class="n" style="color: #333;">ek</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tc_infer_hs_type_ek</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">ek</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">@@ -1198,9 +1203,6 @@ tc_hs_type mode ty@(HsOpTy {}) ek = tc_infer_hs_type_ek mode ty ek</td>
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<pre style="margin: 0;"> <span id="LC1203" class="line" lang="haskell"><span class="n" style="color: #333;">tc_hs_type</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">ty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsKindSig</span> <span class="p">{})</span> <span class="n" style="color: #333;">ek</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tc_infer_hs_type_ek</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">ek</span></span>
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1204
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<pre style="margin: 0;"> <span id="LC1204" class="line" lang="haskell"><span class="n" style="color: #333;">tc_hs_type</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">ty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XHsType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NHsCoreTy</span><span class="p">{}))</span> <span class="n" style="color: #333;">ek</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tc_infer_hs_type_ek</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">ek</span></span>
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<pre style="margin: 0;"> <span id="LC1205" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1201" class="line" lang="haskell"><span class="n" style="color: #333;">tc_hs_type</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">ty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsWildCardTy</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="n" style="color: #333;">ek</span></span>
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<pre style="margin: 0;">-<span id="LC1202" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcAnonWildCardOcc</span> <span class="kt" style="color: #458; font-weight: 600;">NoExtraConstraint</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">ek</span></span>
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<pre style="margin: 0;">-<span id="LC1203" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1206" 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="LC1207" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Variable Specificity and Forall Visibility]</span></span>
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<pre style="margin: 0;"> <span id="LC1208" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/ef7479323a85c965b50fb2dfd71f537872cedab1...78425e2e6d50575111568a2e6f9d8e7f7e8bae22#3ee8be814b6c6727880deab3772e6af922524bf0"><strong>compiler/GHC/Tc/Gen/Pat.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">@@ -898,6 +898,8 @@ tcDataConPat penv (L con_span con_name) data_con pat_ty_scaled</td>
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<pre style="margin: 0;"> <span id="LC898" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">tenv</span><span class="p">,</span> <span class="n" style="color: #333;">ex_tvs'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInstSuperSkolTyVarsX</span> <span class="n" style="color: #333;">tenv</span> <span class="n" style="color: #333;">ex_tvs</span></span>
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<pre style="margin: 0;"> <span id="LC899" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Get location from monad, not from ex_tvs</span></span>
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<pre style="margin: 0;"> <span id="LC900" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This freshens: See Note [Freshen existentials]</span></span>
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<pre style="margin: 0;">+<span id="LC901" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Why "super"? See Note [Binding when lookup up instances]</span></span>
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<pre style="margin: 0;">+<span id="LC902" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in GHC.Core.InstEnv.</span></span>
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<pre style="margin: 0;"> <span id="LC903" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC904" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="c1" style="color: #998; font-style: italic;">-- pat_ty' = mkTyConApp tycon ctxt_res_tys</span></span>
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<pre style="margin: 0;"> <span id="LC905" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- pat_ty' is type of the actual constructor application</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/ef7479323a85c965b50fb2dfd71f537872cedab1...78425e2e6d50575111568a2e6f9d8e7f7e8bae22#f018e77421f495c6f75733fee4a511cfe57bebe8"><strong>compiler/GHC/Tc/Solver/Canonical.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1019,29 +1019,21 @@ can_eq_nc' _flat _rdr_env _envs ev eq_rel ty1@(LitTy l1) _ (LitTy l2) _</td>
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1019
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<pre style="margin: 0;"> <span id="LC1019" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Decompose FunTy: (s -> t) and (c => t)</span></span>
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1020
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<pre style="margin: 0;"> <span id="LC1020" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- NB: don't decompose (Int -> blah) ~ (Show a => blah)</span></span>
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1021
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1021
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<pre style="margin: 0;"> <span id="LC1021" class="line" lang="haskell"><span class="n" style="color: #333;">can_eq_nc'</span> <span class="n" style="color: #333;">_flat</span> <span class="n" style="color: #333;">_rdr_env</span> <span class="n" style="color: #333;">_envs</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">eq_rel</span></span>
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1022
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<pre style="margin: 0;">-<span id="LC1022" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FunTy</span> <span class="p">{</span> <span class="n" style="color: #333;">ft_mult</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">am1</span><span class="p">,</span> <span class="n" style="color: #333;">ft_af</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">af1</span><span class="p">,</span> <span class="n" style="color: #333;">ft_arg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty1a</span><span class="p">,</span> <span class="n" style="color: #333;">ft_res</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty1b</span> <span class="p">})</span> <span class="n" style="color: #333;">ps_ty1</span></span>
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1023
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<pre style="margin: 0;">-<span id="LC1023" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FunTy</span> <span class="p">{</span> <span class="n" style="color: #333;">ft_mult</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">am2</span><span class="p">,</span> <span class="n" style="color: #333;">ft_af</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">af2</span><span class="p">,</span> <span class="n" style="color: #333;">ft_arg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty2a</span><span class="p">,</span> <span class="n" style="color: #333;">ft_res</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty2b</span> <span class="p">})</span> <span class="n" style="color: #333;">ps_ty2</span></span>
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1024
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<pre style="margin: 0;">-<span id="LC1024" 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="n" style="color: #333;">ty1a_rep</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getRuntimeRep_maybe</span> <span class="n" style="color: #333;">ty1a</span> <span class="c1" style="color: #998; font-style: italic;">-- getRutimeRep_maybe:</span></span>
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<pre style="margin: 0;">+<span id="LC1022" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FunTy</span> <span class="p">{</span> <span class="n" style="color: #333;">ft_mult</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">am1</span><span class="p">,</span> <span class="n" style="color: #333;">ft_af</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">af1</span><span class="p">,</span> <span class="n" style="color: #333;">ft_arg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty1a</span><span class="p">,</span> <span class="n" style="color: #333;">ft_res</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty1b</span> <span class="p">})</span> <span class="n" style="color: #333;">_ps_ty1</span></span>
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<pre style="margin: 0;">+<span id="LC1023" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FunTy</span> <span class="p">{</span> <span class="n" style="color: #333;">ft_mult</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">am2</span><span class="p">,</span> <span class="n" style="color: #333;">ft_af</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">af2</span><span class="p">,</span> <span class="n" style="color: #333;">ft_arg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty2a</span><span class="p">,</span> <span class="n" style="color: #333;">ft_res</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty2b</span> <span class="p">})</span> <span class="n" style="color: #333;">_ps_ty2</span></span>
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1024
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<pre style="margin: 0;">+<span id="LC1024" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">af1</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">af2</span> <span class="c1" style="color: #998; font-style: italic;">-- Don't decompose (Int -> blah) ~ (Show a => blah)</span></span>
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1025
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<pre style="margin: 0;">+<span id="LC1025" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">ty1a_rep</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getRuntimeRep_maybe</span> <span class="n" style="color: #333;">ty1a</span> <span class="c1" style="color: #998; font-style: italic;">-- getRutimeRep_maybe:</span></span>
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1025
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1026
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<pre style="margin: 0;"> <span id="LC1026" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">ty1b_rep</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getRuntimeRep_maybe</span> <span class="n" style="color: #333;">ty1b</span> <span class="c1" style="color: #998; font-style: italic;">-- see Note [Decomposing FunTy]</span></span>
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1026
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1027
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<pre style="margin: 0;"> <span id="LC1027" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">ty2a_rep</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getRuntimeRep_maybe</span> <span class="n" style="color: #333;">ty2a</span></span>
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1027
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1028
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<pre style="margin: 0;"> <span id="LC1028" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">ty2b_rep</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getRuntimeRep_maybe</span> <span class="n" style="color: #333;">ty2b</span></span>
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1028
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<pre style="margin: 0;">-<span id="LC1028" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">af1</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">af2</span> <span class="c1" style="color: #998; font-style: italic;">-- Don't decompose (Int -> blah) ~ (Show a => blah)</span></span>
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1029
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<pre style="margin: 0;">-<span id="LC1029" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">canDecomposableTyConAppOK</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">eq_rel</span> <span class="n" style="color: #333;">funTyCon</span></span>
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<pre style="margin: 0;">+<span id="LC1029" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">canDecomposableTyConAppOK</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">eq_rel</span> <span class="n" style="color: #333;">funTyCon</span></span>
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<pre style="margin: 0;"> <span id="LC1030" class="line" lang="haskell"> <span class="p">[</span><span class="n" style="color: #333;">am1</span><span class="p">,</span> <span class="n" style="color: #333;">ty1a_rep</span><span class="p">,</span> <span class="n" style="color: #333;">ty1b_rep</span><span class="p">,</span> <span class="n" style="color: #333;">ty1a</span><span class="p">,</span> <span class="n" style="color: #333;">ty1b</span><span class="p">]</span></span>
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1031
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1031
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<pre style="margin: 0;"> <span id="LC1031" class="line" lang="haskell"> <span class="p">[</span><span class="n" style="color: #333;">am2</span><span class="p">,</span> <span class="n" style="color: #333;">ty2a_rep</span><span class="p">,</span> <span class="n" style="color: #333;">ty2b_rep</span><span class="p">,</span> <span class="n" style="color: #333;">ty2a</span><span class="p">,</span> <span class="n" style="color: #333;">ty2b</span><span class="p">]</span></span>
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1032
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<pre style="margin: 0;">-<span id="LC1032" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">canEqHardFailure</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">ps_ty1</span> <span class="n" style="color: #333;">ps_ty2</span></span>
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1033
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<pre style="margin: 0;">-<span id="LC1033" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in the "else" case, we don't want to fall through, because the TyConApp</span></span>
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1034
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<pre style="margin: 0;">-<span id="LC1034" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- case may trigger, giving a worse error</span></span>
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1035
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1032
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<pre style="margin: 0;"> <span id="LC1032" class="line" lang="haskell"></span>
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1036
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<pre style="margin: 0;"> <span id="LC1033" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Decompose type constructor applications</span></span>
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1037
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1034
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<pre style="margin: 0;"> <span id="LC1034" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- NB: we have expanded type synonyms already</span></span>
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<pre style="margin: 0;">-<span id="LC1038" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We still have to handle the FunTy case separately, just to avoid decomposing</span></span>
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1039
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<pre style="margin: 0;">-<span id="LC1039" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (Int -> blah) and (Show a => blah).</span></span>
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1040
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<pre style="margin: 0;">-<span id="LC1040" class="line" lang="haskell"><span class="n" style="color: #333;">can_eq_nc'</span> <span class="n" style="color: #333;">_flat</span> <span class="n" style="color: #333;">_rdr_env</span> <span class="n" style="color: #333;">_envs</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">eq_rel</span> <span class="n" style="color: #333;">ty1</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ty2</span> <span class="kr" style="font-weight: 600;">_</span></span>
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1041
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<pre style="margin: 0;">-<span id="LC1041" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- use tcSplit to avoid splitting (Eq a => Bool)</span></span>
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1042
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<pre style="margin: 0;">-<span id="LC1042" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">tc1</span><span class="p">,</span> <span class="n" style="color: #333;">tys1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSplitTyConApp_maybe</span> <span class="n" style="color: #333;">ty1</span></span>
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1043
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<pre style="margin: 0;">-<span id="LC1043" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">tc2</span><span class="p">,</span> <span class="n" style="color: #333;">tys2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSplitTyConApp_maybe</span> <span class="n" style="color: #333;">ty2</span></span>
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1044
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<pre style="margin: 0;">-<span id="LC1044" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isTypeFamilyTyCon</span> <span class="n" style="color: #333;">tc1</span><span class="p">)</span></span>
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1035
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<pre style="margin: 0;">+<span id="LC1035" class="line" lang="haskell"><span class="n" style="color: #333;">can_eq_nc'</span> <span class="n" style="color: #333;">_flat</span> <span class="n" style="color: #333;">_rdr_env</span> <span class="n" style="color: #333;">_envs</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">eq_rel</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyConApp</span> <span class="n" style="color: #333;">tc1</span> <span class="n" style="color: #333;">tys1</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyConApp</span> <span class="n" style="color: #333;">tc2</span> <span class="n" style="color: #333;">tys2</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span></span>
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<pre style="margin: 0;">+<span id="LC1036" 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;">isTypeFamilyTyCon</span> <span class="n" style="color: #333;">tc1</span><span class="p">)</span></span>
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1045
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1037
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<pre style="margin: 0;"> <span id="LC1037" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isTypeFamilyTyCon</span> <span class="n" style="color: #333;">tc2</span><span class="p">)</span></span>
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1046
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1038
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<pre style="margin: 0;"> <span id="LC1038" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">canTyConApp</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">eq_rel</span> <span class="n" style="color: #333;">tc1</span> <span class="n" style="color: #333;">tys1</span> <span class="n" style="color: #333;">tc2</span> <span class="n" style="color: #333;">tys2</span></span>
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1047
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1039
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<pre style="margin: 0;"> <span id="LC1039" 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">@@ -2040,7 +2032,7 @@ See also #10715, which induced this addition.</td>
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2032
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<pre style="margin: 0;"> <span id="LC2032" class="line" lang="haskell"></span>
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2041
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2033
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<pre style="margin: 0;"> <span id="LC2033" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Put touchable variables on the left]</span></span>
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2042
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2034
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<pre style="margin: 0;"> <span id="LC2034" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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2043
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<pre style="margin: 0;">-<span id="LC2043" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">#10009, a very nasty example:</span></span>
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2035
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<pre style="margin: 0;">+<span id="LC2035" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">Ticket </span>#10009, a very nasty example:</span></span>
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2044
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2036
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<pre style="margin: 0;"> <span id="LC2036" class="line" lang="haskell"></span>
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2045
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2037
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<pre style="margin: 0;"> <span id="LC2037" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: (UnF (F b) ~ b) => F b -> ()</span></span>
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2046
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2038
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<pre style="margin: 0;"> <span id="LC2038" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2085" 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="2077" 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">@@ -2085,7 +2077,7 @@ in a Given. On the other hand, the original LHS mentioned only variables</td>
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2085
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2077
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<pre style="margin: 0;"> <span id="LC2077" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that appear in Givens. We thus choose to put variables that can appear</span></span>
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2086
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2078
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<pre style="margin: 0;"> <span id="LC2078" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in Wanteds on the left.</span></span>
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2087
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2079
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<pre style="margin: 0;"> <span id="LC2079" class="line" lang="haskell"></span>
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2088
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<pre style="margin: 0;">-<span id="LC2088" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">#12526 is another good example of this in action.</span></span>
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2080
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<pre style="margin: 0;">+<span id="LC2080" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">Ticket </span>#12526 is another good example of this in action.</span></span>
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2089
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2081
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<pre style="margin: 0;"> <span id="LC2081" class="line" lang="haskell"></span>
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2090
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2082
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<pre style="margin: 0;"> <span id="LC2082" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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2091
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2083
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<pre style="margin: 0;"> <span id="LC2083" 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">@@ -2476,18 +2468,18 @@ canEqOK dflags eq_rel lhs rhs</td>
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2476
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2468
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<pre style="margin: 0;"> <span id="LC2468" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- are not generally insoluble</span></span>
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2477
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2469
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<pre style="margin: 0;"> <span id="LC2469" class="line" lang="haskell"></span>
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2478
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2470
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<pre style="margin: 0;"> <span id="LC2470" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2479
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<pre style="margin: 0;">-<span id="LC2479" class="line" lang="haskell"> <span class="n" style="color: #333;">good_rhs</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">kinds_match</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">bad_newtype</span></span>
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2471
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<pre style="margin: 0;">+<span id="LC2471" class="line" lang="haskell"> <span class="n" style="color: #333;">good_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">kinds_match</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">bad_newtype</span></span>
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2480
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2472
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<pre style="margin: 0;"> <span id="LC2472" class="line" lang="haskell"></span>
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2481
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<pre style="margin: 0;">-<span id="LC2481" class="line" lang="haskell"> <span class="n" style="color: #333;">lhs_kind</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">canEqLHSKind</span> <span class="n" style="color: #333;">lhs</span></span>
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2482
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<pre style="margin: 0;">-<span id="LC2482" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_kind</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcTypeKind</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;">+<span id="LC2473" class="line" lang="haskell"> <span class="n" style="color: #333;">lhs_kind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">canEqLHSKind</span> <span class="n" style="color: #333;">lhs</span></span>
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<pre style="margin: 0;">+<span id="LC2474" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_kind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcTypeKind</span> <span class="n" style="color: #333;">rhs</span></span>
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2483
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<pre style="margin: 0;"> <span id="LC2475" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2484" class="line" lang="haskell"> <span class="n" style="color: #333;">kinds_match</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lhs_kind</span> <span class="p">`</span><span class="n" style="color: #333;">tcEqType</span><span class="p">`</span> <span class="n" style="color: #333;">rhs_kind</span></span>
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<pre style="margin: 0;">+<span id="LC2476" class="line" lang="haskell"> <span class="n" style="color: #333;">kinds_match</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lhs_kind</span> <span class="p">`</span><span class="n" style="color: #333;">tcEqType</span><span class="p">`</span> <span class="n" style="color: #333;">rhs_kind</span></span>
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2477
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<pre style="margin: 0;"> <span id="LC2477" class="line" lang="haskell"></span>
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2486
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<pre style="margin: 0;">-<span id="LC2486" class="line" lang="haskell"> <span class="n" style="color: #333;">bad_newtype</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ReprEq</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">eq_rel</span></span>
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2487
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<pre style="margin: 0;">-<span id="LC2487" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">tc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tyConAppTyCon_maybe</span> <span class="n" style="color: #333;">rhs</span></span>
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2488
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<pre style="margin: 0;">-<span id="LC2488" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isNewTyCon</span> <span class="n" style="color: #333;">tc</span></span>
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2489
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<pre style="margin: 0;">-<span id="LC2489" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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2490
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<pre style="margin: 0;">-<span id="LC2490" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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2478
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<pre style="margin: 0;">+<span id="LC2478" class="line" lang="haskell"> <span class="n" style="color: #333;">bad_newtype</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ReprEq</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">eq_rel</span></span>
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2479
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<pre style="margin: 0;">+<span id="LC2479" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">tc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tyConAppTyCon_maybe</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;">+<span id="LC2480" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isNewTyCon</span> <span class="n" style="color: #333;">tc</span></span>
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<pre style="margin: 0;">+<span id="LC2481" 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="LC2482" 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="LC2483" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2484" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Equalities with incompatible kinds]</span></span>
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2485
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<pre style="margin: 0;"> <span id="LC2485" 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">@@ -2530,17 +2522,18 @@ Wrinkles:</td>
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2522
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<pre style="margin: 0;"> <span id="LC2522" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> tales of destruction.</span></span>
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2531
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2523
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<pre style="margin: 0;"> <span id="LC2523" class="line" lang="haskell"></span>
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2532
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2524
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<pre style="margin: 0;"> <span id="LC2524" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> So, we have an invariant on CEqCan (TyEq:H) that the RHS does not have</span></span>
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2533
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<pre style="margin: 0;">-<span id="LC2533" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> any coercion holes. This is checked in metaTyVarUpdateOK. We also</span></span>
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2525
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<pre style="margin: 0;">+<span id="LC2525" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> any coercion holes. This is checked in checkTypeEq. Any equalities that</span></span>
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2526
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<pre style="margin: 0;">+<span id="LC2526" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> have such an RHS are turned in CIrredCans with a BlockedCIS status. We also</span></span>
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2534
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2527
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<pre style="margin: 0;"> <span id="LC2527" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> must be sure to kick out any constraints that mention coercion holes</span></span>
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2535
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<pre style="margin: 0;">-<span id="LC2535" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> when those holes get filled in.</span></span>
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2528
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<pre style="margin: 0;">+<span id="LC2528" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> when those holes get filled in<span class="idiff left right">, so that the unification step can now proceed</span>.</span></span>
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2536
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2529
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<pre style="margin: 0;"> <span id="LC2529" class="line" lang="haskell"></span>
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2537
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2530
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<pre style="margin: 0;"> <span id="LC2530" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (2a) We must now absolutely make sure to kick out any constraints that</span></span>
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2538
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<pre style="margin: 0;">-<span id="LC2538" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> mention a newly-filled-in coercion hole<span class="idiff left right">. This is done in</span></span></span>
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2539
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<pre style="margin: 0;">-<span id="LC2539" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">kickOutAfterFillingCoercionHole. But we only kick out when the</span></span></span>
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2540
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<pre style="margin: 0;">-<span id="LC2540" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">filling coercion contains no coercion holes. This extra check</span></span></span>
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2541
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<pre style="margin: 0;">-<span id="LC2541" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">avoids needless work when rewriting evidence (which fills coercion</span></span></span>
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2542
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<pre style="margin: 0;">-<span id="LC2542" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">holes) and aids efficiency. It also can avoid a loop in the solver</span></span></span>
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2543
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<pre style="margin: 0;">-<span id="LC2543" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> that would otherwise arise in this case:</span></span>
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<pre style="margin: 0;">+<span id="LC2531" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> mention a newly-filled-in coercion hole<span class="idiff left right"> -- if there are no more</span></span></span>
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2532
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<pre style="margin: 0;">+<span id="LC2532" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">remaining coercion holes. This is done in</span></span></span>
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2533
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<pre style="margin: 0;">+<span id="LC2533" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">kickOutAfterFillingCoercionHole. The extra check that there are no</span></span></span>
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2534
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<pre style="margin: 0;">+<span id="LC2534" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">more remaining holes avoids needless work when rewriting evidence</span></span></span>
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2535
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<pre style="margin: 0;">+<span id="LC2535" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">(which fills coercion holes) and aids efficiency. It also can avoid</span></span></span>
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2536
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<pre style="margin: 0;">+<span id="LC2536" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">a loop in the solver </span>that would otherwise arise in this case:</span></span>
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2544
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2537
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<pre style="margin: 0;"> <span id="LC2537" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] w1 :: (ty1 :: F a) ~ (ty2 :: s)</span></span>
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2545
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2538
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<pre style="margin: 0;"> <span id="LC2538" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> After canonicalisation, we discover that this equality is heterogeneous.</span></span>
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2546
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2539
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<pre style="margin: 0;"> <span id="LC2539" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> So we emit</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">@@ -2551,11 +2544,14 @@ Wrinkles:</td>
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<pre style="margin: 0;"> <span id="LC2544" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> and forth, as it goes through canEqTyVarFunEq. We thus get</span></span>
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2545
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<pre style="margin: 0;"> <span id="LC2545" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> co_abc := sym co_abd, and then co_abd := sym co_abe, with</span></span>
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2546
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<pre style="margin: 0;"> <span id="LC2546" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] co_abe :: F a ~ s</span></span>
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<pre style="margin: 0;">-<span id="LC2554" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> right back where we started. But all this filling in would,</span></span>
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<pre style="margin: 0;">-<span id="LC2555" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> naively, cause kicking w2 out. Which, when it got processed,</span></span>
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<pre style="margin: 0;">+<span id="LC2547" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> right back where we started. (At this point, we're in canEqCanLHSFinish,</span></span>
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<pre style="margin: 0;">+<span id="LC2548" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> so we're not looping.) But all this filling in would,</span></span>
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<pre style="margin: 0;">+<span id="LC2549" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> naively, cause w2 to be kicked out. Which, when it got processed,</span></span>
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<pre style="margin: 0;"> <span id="LC2550" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> would get this whole chain going again. The solution is to</span></span>
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2557
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2551
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<pre style="margin: 0;"> <span id="LC2551" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> kick out a blocked constraint only when the result of filling</span></span>
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2558
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<pre style="margin: 0;"> <span id="LC2552" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in the blocking coercion involves no further blocking coercions.</span></span>
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<pre style="margin: 0;">+<span id="LC2553" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Alternatively, we could be careful not to do unnecessary swaps during</span></span>
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<pre style="margin: 0;">+<span id="LC2554" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> canonicalisation, but that seems hard to do, in general.</span></span>
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2559
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<pre style="margin: 0;"> <span id="LC2555" class="line" lang="haskell"></span>
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2560
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2556
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<pre style="margin: 0;"> <span id="LC2556" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (2b) Consider this case:</span></span>
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<pre style="margin: 0;"> <span id="LC2557" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [G] co_given :: k1 ~ k2</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">@@ -2592,8 +2588,8 @@ Wrinkles:</td>
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<pre style="margin: 0;"> <span id="LC2588" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> cast appears opposite a tyvar. This is implemented in the cast case</span></span>
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2593
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2589
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<pre style="margin: 0;"> <span id="LC2589" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> of can_eq_nc'.</span></span>
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2590
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<pre style="margin: 0;"> <span id="LC2590" class="line" lang="haskell"></span>
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2595
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<pre style="margin: 0;">-<span id="LC2595" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (4) Reporting an error for a constraint that is blocked <span class="idiff left right">only because</span></span></span>
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2596
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<pre style="margin: 0;">-<span id="LC2596" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> <span class="idiff left right">of wrinkle (2) </span>is hard: what would we say to users? And we don't</span></span>
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2591
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<pre style="margin: 0;">+<span id="LC2591" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (4) Reporting an error for a constraint that is blocked <span class="idiff left right">with status BlockedCIS</span></span></span>
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2592
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<pre style="margin: 0;">+<span id="LC2592" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> is hard: what would we say to users? And we don't</span></span>
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2593
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<pre style="margin: 0;"> <span id="LC2593" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> really need to report, because if a constraint is blocked, then</span></span>
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2598
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2594
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<pre style="margin: 0;"> <span id="LC2594" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> there is unsolved wanted blocking it; that unsolved wanted will</span></span>
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2599
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2595
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<pre style="margin: 0;"> <span id="LC2595" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> be reported. We thus push such errors to the bottom of the queue</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">@@ -2671,7 +2667,25 @@ In order to solve the Wanted, we must use the Given to rewrite `a` to</td>
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2671
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2667
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<pre style="margin: 0;"> <span id="LC2667" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Maybe (F a). But note that the Given has an occurs-check failure, and</span></span>
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2672
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2668
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<pre style="margin: 0;"> <span id="LC2668" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">so we can't straightforwardly add the Given to the inert set.</span></span>
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2673
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2669
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<pre style="margin: 0;"> <span id="LC2669" class="line" lang="haskell"></span>
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2674
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<pre style="margin: 0;">-<span id="LC2674" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Instead, we detect this scenario by the following characteristics:</span></span>
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2670
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<pre style="margin: 0;">+<span id="LC2670" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The key idea is to replace the (F a) in the RHS of the Given with a</span></span>
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2671
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<pre style="margin: 0;">+<span id="LC2671" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">fresh variable, which we'll call a CycleBreakerTv, or cbv. Then, emit</span></span>
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<pre style="margin: 0;">+<span id="LC2672" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">a new Given to connect cbv with F a. So our situation becomes</span></span>
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2673
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<pre style="margin: 0;">+<span id="LC2673" class="line" lang="haskell"></span>
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2674
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<pre style="margin: 0;">+<span id="LC2674" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance C (Maybe b)</span></span>
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2675
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<pre style="margin: 0;">+<span id="LC2675" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [G] a ~ Maybe cbv</span></span>
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2676
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<pre style="margin: 0;">+<span id="LC2676" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [G] F a ~ cbv</span></span>
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2677
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<pre style="margin: 0;">+<span id="LC2677" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] C a</span></span>
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2678
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<pre style="margin: 0;">+<span id="LC2678" class="line" lang="haskell"></span>
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2679
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<pre style="margin: 0;">+<span id="LC2679" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note the orientation of the second Given. The type family ends up</span></span>
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2680
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<pre style="margin: 0;">+<span id="LC2680" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">on the left; see commentary on canEqTyVarFunEq, which decides how to</span></span>
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2681
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<pre style="margin: 0;">+<span id="LC2681" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">orient such cases. No special treatment for CycleBreakerTvs is</span></span>
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2682
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<pre style="margin: 0;">+<span id="LC2682" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">necessary. This scenario is now easily soluble, by using the first</span></span>
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2683
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<pre style="margin: 0;">+<span id="LC2683" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Given to rewrite the Wanted, which can now be solved.</span></span>
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2684
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<pre style="margin: 0;">+<span id="LC2684" class="line" lang="haskell"></span>
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2685
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<pre style="margin: 0;">+<span id="LC2685" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(The first Given actually also rewrites the second one. This causes</span></span>
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2686
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<pre style="margin: 0;">+<span id="LC2686" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">no trouble.)</span></span>
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2687
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<pre style="margin: 0;">+<span id="LC2687" class="line" lang="haskell"></span>
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2688
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<pre style="margin: 0;">+<span id="LC2688" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">More generally, we detect this scenario by the following characteristics:</span></span>
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2675
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2689
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<pre style="margin: 0;"> <span id="LC2689" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - a Given CEqCan constraint</span></span>
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2676
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2690
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<pre style="margin: 0;"> <span id="LC2690" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - with a tyvar on its LHS</span></span>
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2677
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2691
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<pre style="margin: 0;"> <span id="LC2691" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - with a soluble occurs-check failure</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2703" 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">@@ -2689,16 +2703,24 @@ after we're done running the solver (in nestImplicTcS and runTcSWithEvBinds).</td>
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2689
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2703
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<pre style="margin: 0;"> <span id="LC2703" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This is done by restoreTyVarCycles, which uses the inert_cycle_breakers field in</span></span>
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2690
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2704
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<pre style="margin: 0;"> <span id="LC2704" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">InertSet, which contains the pairings invented in breakTyVarCycle.</span></span>
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2691
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2705
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<pre style="margin: 0;"> <span id="LC2705" class="line" lang="haskell"></span>
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2692
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<pre style="margin: 0;">-<span id="LC2692" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In our example, we start with</span></span>
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2693
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<pre style="margin: 0;">-<span id="LC2693" class="line" lang="haskell"></span>
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2694
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<pre style="margin: 0;">-<span id="LC2694" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [G] a ~ Maybe (F a)</span></span>
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2695
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<pre style="margin: 0;">-<span id="LC2695" class="line" lang="haskell"></span>
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2696
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<pre style="margin: 0;">-<span id="LC2696" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We then change this to become</span></span>
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2697
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<pre style="margin: 0;">-<span id="LC2697" class="line" lang="haskell"></span>
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2698
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<pre style="margin: 0;">-<span id="LC2698" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [G] a ~ Maybe cbv</span></span>
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2699
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<pre style="margin: 0;">-<span id="LC2699" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [G] F a ~ cbv</span></span>
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2700
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<pre style="margin: 0;">-<span id="LC2700" class="line" lang="haskell"></span>
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2701
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<pre style="margin: 0;">-<span id="LC2701" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and set cbv := F a after we're done solving.</span></span>
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2706
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<pre style="margin: 0;">+<span id="LC2706" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">That is:</span></span>
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2707
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<pre style="margin: 0;">+<span id="LC2707" class="line" lang="haskell"></span>
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2708
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<pre style="margin: 0;">+<span id="LC2708" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We transform</span></span>
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2709
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<pre style="margin: 0;">+<span id="LC2709" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [G] g : a ~ ...(F a)...</span></span>
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2710
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<pre style="margin: 0;">+<span id="LC2710" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to</span></span>
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2711
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<pre style="margin: 0;">+<span id="LC2711" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [G] (Refl a) : F a ~ cbv -- CEqCan</span></span>
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2712
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<pre style="margin: 0;">+<span id="LC2712" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [G] g : a ~ ...cbv... -- CEqCan</span></span>
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2713
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<pre style="margin: 0;">+<span id="LC2713" class="line" lang="haskell"></span>
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2714
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<pre style="margin: 0;">+<span id="LC2714" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that</span></span>
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2715
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<pre style="margin: 0;">+<span id="LC2715" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* `cbv` is a fresh cycle breaker variable.</span></span>
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2716
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<pre style="margin: 0;">+<span id="LC2716" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* `cbv` is a is a meta-tyvar, but it is completely untouchable.</span></span>
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2717
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<pre style="margin: 0;">+<span id="LC2717" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* We track the cycle-breaker variables in inert_cycle_breakers in InertSet</span></span>
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2718
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<pre style="margin: 0;">+<span id="LC2718" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* We eventually fill in the cycle-breakers, with `cbv := F a`.</span></span>
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2719
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<pre style="margin: 0;">+<span id="LC2719" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> No one else fills in cycle-breakers!</span></span>
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2720
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<pre style="margin: 0;">+<span id="LC2720" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* This fill-in is done when solving is complete, by restoreTyVarCycles</span></span>
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2721
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<pre style="margin: 0;">+<span id="LC2721" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in nestImplicTcS and runTcSWithEvBinds.</span></span>
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2722
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<pre style="margin: 0;">+<span id="LC2722" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* The evidence for the new `F a ~ cbv` constraint is Refl, because we know this fill-in is</span></span>
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2723
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<pre style="margin: 0;">+<span id="LC2723" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ultimately going to happen.</span></span>
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2702
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2724
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<pre style="margin: 0;"> <span id="LC2724" class="line" lang="haskell"></span>
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2703
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2725
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<pre style="margin: 0;"> <span id="LC2725" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">There are drawbacks of this approach:</span></span>
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2704
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2726
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<pre style="margin: 0;"> <span id="LC2726" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2749" 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="2771" 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">@@ -2749,14 +2771,26 @@ Details:</td>
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2749
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2771
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<pre style="margin: 0;"> <span id="LC2771" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The temporary ill-kinded type hurts no one, and avoiding this would</span></span>
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2750
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2772
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<pre style="margin: 0;"> <span id="LC2772" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> be quite painfully difficult.</span></span>
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2751
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2773
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<pre style="margin: 0;"> <span id="LC2773" class="line" lang="haskell"></span>
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2774
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<pre style="margin: 0;">+<span id="LC2774" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Specifically, this detail does not contravene the Purely Kinded Type Invariant</span></span>
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2775
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<pre style="margin: 0;">+<span id="LC2775" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (Note [The Purely Kinded Type Invariant (PKTI)] in GHC.Tc.Gen.HsType).</span></span>
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2776
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<pre style="margin: 0;">+<span id="LC2776" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The PKTI says that we can call typeKind on any type, without failure.</span></span>
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2777
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<pre style="margin: 0;">+<span id="LC2777" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> It would be violated if we, say, replaced a kind (a -> b) with a kind c,</span></span>
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2778
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<pre style="margin: 0;">+<span id="LC2778" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> because an arrow kind might be consulted in piResultTys. Here, we are</span></span>
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2779
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<pre style="margin: 0;">+<span id="LC2779" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> replacing one opaque type like (F a b c) with another, cbv (opaque in</span></span>
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2780
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<pre style="margin: 0;">+<span id="LC2780" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> that we never assume anything about its structure, like that it has a</span></span>
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2781
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<pre style="margin: 0;">+<span id="LC2781" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> result type or a RuntimeRep argument).</span></span>
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2782
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<pre style="margin: 0;">+<span id="LC2782" class="line" lang="haskell"></span>
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2752
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2783
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<pre style="margin: 0;"> <span id="LC2783" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (4) The evidence for the produced Givens is all just reflexive, because</span></span>
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2753
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2784
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<pre style="margin: 0;"> <span id="LC2784" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> we will eventually set the cycle-breaker variable to be the type family,</span></span>
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2754
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2785
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<pre style="margin: 0;"> <span id="LC2785" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> and then, after the zonk, all will be well.</span></span>
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2755
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2786
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<pre style="margin: 0;"> <span id="LC2786" class="line" lang="haskell"></span>
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2756
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2787
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<pre style="margin: 0;"> <span id="LC2787" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (5) The approach here is inefficient. For instance, we could choose to</span></span>
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2757
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<pre style="margin: 0;">-<span id="LC2757" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> affect only type family applications that mention the offending variable.</span></span>
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2758
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<pre style="margin: 0;">-<span id="LC2758" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We could try to detect cases like a ~ (F a, F a) and use the same</span></span>
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2759
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<pre style="margin: 0;">-<span id="LC2759" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> tyvar to replace F a. (Cf. Note [Flattening] in GHC.Core.Unify, which</span></span>
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2788
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<pre style="margin: 0;">+<span id="LC2788" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> affect only type family applications that mention the offending variable:</span></span>
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2789
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<pre style="margin: 0;">+<span id="LC2789" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in a ~ (F b, G a), we need to replace only G a, not F b. Furthermore,</span></span>
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2790
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<pre style="margin: 0;">+<span id="LC2790" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> we could try to detect cases like a ~ (F a, F a) and use the same</span></span>
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2791
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<pre style="margin: 0;">+<span id="LC2791" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> tyvar to replace F a. (Cf.</span></span>
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2792
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<pre style="margin: 0;">+<span id="LC2792" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Note [Flattening type-family applications when matching instances]</span></span>
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2793
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<pre style="margin: 0;">+<span id="LC2793" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in GHC.Core.Unify, which</span></span>
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2760
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2794
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<pre style="margin: 0;"> <span id="LC2794" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> goes to this extra effort.) There may be other opportunities for</span></span>
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2761
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2795
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<pre style="margin: 0;"> <span id="LC2795" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> improvement. However, this is really a very small corner case, always</span></span>
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2762
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2796
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<pre style="margin: 0;"> <span id="LC2796" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> tickled by a user-written Given. The investment to craft a clever,</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">@@ -2768,7 +2802,9 @@ Details:</td>
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<pre style="margin: 0;"> <span id="LC2802" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> evidence itself. As in Detail (4), we don't need to change the</span></span>
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2769
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2803
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<pre style="margin: 0;"> <span id="LC2803" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> evidence term (as in e.g. rewriteEqEvidence) because the cycle</span></span>
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2770
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2804
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<pre style="margin: 0;"> <span id="LC2804" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> breaker variables are all zonked away by the time we examine the</span></span>
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2771
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<pre style="margin: 0;">-<span id="LC2771" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> evidence.</span></span>
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2805
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<pre style="margin: 0;">+<span id="LC2805" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> evidence. That is, we must set the ctev_pred of the ctEvidence.</span></span>
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2806
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<pre style="margin: 0;">+<span id="LC2806" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> This is implemented in canEqCanLHSFinish, with a reference to</span></span>
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2807
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<pre style="margin: 0;">+<span id="LC2807" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> this detail.</span></span>
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2772
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2808
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<pre style="margin: 0;"> <span id="LC2808" class="line" lang="haskell"></span>
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2773
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2809
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<pre style="margin: 0;"> <span id="LC2809" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (7) We don't wish to apply this magic to CycleBreakerTvs themselves.</span></span>
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2774
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2810
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<pre style="margin: 0;"> <span id="LC2810" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Consider this, from typecheck/should_compile/ContextStack2:</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2837" 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">@@ -2801,7 +2837,11 @@ Details:</td>
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2801
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2837
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<pre style="margin: 0;"> <span id="LC2837" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> unchecked, this will end up breaking cycles again, looping ad</span></span>
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2802
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2838
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<pre style="margin: 0;"> <span id="LC2838" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> infinitum (and resulting in a context-stack reduction error,</span></span>
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2803
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<pre style="margin: 0;"> <span id="LC2839" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> not an outright loop). The solution is easy: don't break cycles</span></span>
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2804
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<pre style="margin: 0;">-<span id="LC2804" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> if the var is already a CycleBreakerTv. This makes sense, because</span></span>
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2840
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<pre style="margin: 0;">+<span id="LC2840" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> if the var is already a CycleBreakerTv. Instead, we mark this</span></span>
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2841
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<pre style="margin: 0;">+<span id="LC2841" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> final Given as a CIrredCan with an OtherCIS status (it's not</span></span>
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2842
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<pre style="margin: 0;">+<span id="LC2842" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> insoluble).</span></span>
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2843
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<pre style="margin: 0;">+<span id="LC2843" class="line" lang="haskell"></span>
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2844
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<pre style="margin: 0;">+<span id="LC2844" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Not breaking cycles fursther makes sense, because</span></span>
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2805
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<pre style="margin: 0;"> <span id="LC2845" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> we only want to break cycles for user-written loopy Givens, and</span></span>
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2806
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<pre style="margin: 0;"> <span id="LC2846" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a CycleBreakerTv certainly isn't user-written.</span></span>
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2807
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2847
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<pre style="margin: 0;"> <span id="LC2847" class="line" lang="haskell"></span>
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<li id="81707f1fe21087531cefd70879aa09c2be5c1d22">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/ef7479323a85c965b50fb2dfd71f537872cedab1...78425e2e6d50575111568a2e6f9d8e7f7e8bae22#81707f1fe21087531cefd70879aa09c2be5c1d22"><strong>compiler/GHC/Tc/Solver/Flatten.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">@@ -362,7 +362,7 @@ If we need to make this yet more performant, a possible way forward is to</td>
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<pre style="margin: 0;"> <span id="LC362" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">duplicate the flattener code for the nominal case, and make that case</span></span>
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<pre style="margin: 0;"> <span id="LC363" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">faster. This doesn't seem quite worth it, yet.</span></span>
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<pre style="margin: 0;"> <span id="LC364" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC365" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [flatten_exact_fam_app<span class="idiff left right">_fully</span> performance]</span></span>
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<pre style="margin: 0;">+<span id="LC365" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [flatten_exact_fam_app performance]</span></span>
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<pre style="margin: 0;"> <span id="LC366" 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="LC367" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Once we've got a flat rhs, we extend the famapp-cache to record</span></span>
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<pre style="margin: 0;"> <span id="LC368" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the result. Doing so can save lots of work when the same redex shows up more</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">@@ -727,15 +727,22 @@ keeps types smaller. But we need to take care.</td>
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<pre style="margin: 0;"> <span id="LC727" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Suppose</span></span>
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<pre style="margin: 0;"> <span id="LC728" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type Syn a = Int</span></span>
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<pre style="margin: 0;"> <span id="LC729" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type instance F Bool = Syn (F Bool)</span></span>
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<pre style="margin: 0;">+<span id="LC730" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [G] F Bool ~ Syn (F Bool)</span></span>
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<pre style="margin: 0;"> <span id="LC731" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC731" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If we don't expand the synonym, we'll fall into an unnecessary loop.</span></span>
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<pre style="margin: 0;">+<span id="LC732" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If we don't expand the synonym, we'll get a spurious occurs-check</span></span>
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<pre style="margin: 0;">+<span id="LC733" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">failure. This is normally what occCheckExpand takes care of, but</span></span>
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<pre style="margin: 0;">+<span id="LC734" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the LHS is a type family application, and occCheckExpand (already</span></span>
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<pre style="margin: 0;">+<span id="LC735" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">complex enough as it is) does not know how to expand to avoid</span></span>
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<pre style="margin: 0;">+<span id="LC736" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">a type family application.</span></span>
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<pre style="margin: 0;"> <span id="LC737" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC738" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In addition, expanding the forgetful synonym like this</span></span>
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<pre style="margin: 0;">-<span id="LC734" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">will generally yield a *smaller* type. We thus expand forgetful</span></span>
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<pre style="margin: 0;">+<span id="LC739" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">will generally yield a *smaller* type. To wit, if we spot</span></span>
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<pre style="margin: 0;">+<span id="LC740" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">S ( ... F tys ... ), where S is forgetful, we don't want to bother</span></span>
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<pre style="margin: 0;">+<span id="LC741" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">doing hard work simplifying (F tys). We thus expand forgetful</span></span>
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<pre style="margin: 0;"> <span id="LC742" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">synonyms, but not others.</span></span>
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<pre style="margin: 0;"> <span id="LC743" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC737" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">One nice consequence is that we never have to occCheckExpand flattened</span></span></span>
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<pre style="margin: 0;">-<span id="LC738" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">types, as any forgetful synonyms are already expanded</span>.</span></span>
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<pre style="margin: 0;">+<span id="LC744" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">isForgetfulSynTyCon returns True more often than it needs to, so</span></span></span>
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<pre style="margin: 0;">+<span id="LC745" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">we err on the side of more expansion</span>.</span></span>
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<pre style="margin: 0;"> <span id="LC746" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC747" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We also, of course, must expand type synonyms that mention type families,</span></span>
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<pre style="margin: 0;"> <span id="LC748" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">so those families can get reduced.</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">@@ -745,11 +752,63 @@ so those families can get reduced.</td>
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<pre style="margin: 0;"> <span id="LC752" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Flattening a type-family application</span></span>
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<pre style="margin: 0;"> <span id="LC753" 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="LC754" 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="LC755" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC756" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [How to normalise a family application]</span></span>
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<pre style="margin: 0;">+<span id="LC757" 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="LC758" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Given an exactly saturated family application, how should we normalise it?</span></span>
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<pre style="margin: 0;">+<span id="LC759" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This Note spells out the algorithm and its reasoning.</span></span>
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<pre style="margin: 0;">+<span id="LC760" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC761" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">STEP 1. Try the famapp-cache. If we get a cache hit, jump to FINISH.</span></span>
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<pre style="margin: 0;">+<span id="LC762" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC763" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">STEP 2. Try top-level instances. Note that we haven't simplified the arguments</span></span>
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<pre style="margin: 0;">+<span id="LC764" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> yet. Example:</span></span>
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<pre style="margin: 0;">+<span id="LC765" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type instance F (Maybe a) = Int</span></span>
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766
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<pre style="margin: 0;">+<span id="LC766" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> target: F (Maybe (G Bool))</span></span>
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767
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<pre style="margin: 0;">+<span id="LC767" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Instead of first trying to simplify (G Bool), we use the instance first. This</span></span>
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768
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<pre style="margin: 0;">+<span id="LC768" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> avoids the work of simplifying G Bool.</span></span>
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769
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<pre style="margin: 0;">+<span id="LC769" class="line" lang="haskell"></span>
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770
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<pre style="margin: 0;">+<span id="LC770" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> If an instance is found, jump to FINISH.</span></span>
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771
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<pre style="margin: 0;">+<span id="LC771" class="line" lang="haskell"></span>
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772
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<pre style="margin: 0;">+<span id="LC772" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">STEP 3. Flatten all arguments. This might expose more information so that we</span></span>
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773
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<pre style="margin: 0;">+<span id="LC773" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> can use a top-level instance.</span></span>
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774
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<pre style="margin: 0;">+<span id="LC774" class="line" lang="haskell"></span>
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775
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<pre style="margin: 0;">+<span id="LC775" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Continue to the next step.</span></span>
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776
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<pre style="margin: 0;">+<span id="LC776" class="line" lang="haskell"></span>
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777
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<pre style="margin: 0;">+<span id="LC777" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">STEP 4. Try the inerts. Note that we try the inerts *after* flattening the</span></span>
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778
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<pre style="margin: 0;">+<span id="LC778" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> arguments, because the inerts will have flattened LHSs.</span></span>
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779
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<pre style="margin: 0;">+<span id="LC779" class="line" lang="haskell"></span>
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780
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<pre style="margin: 0;">+<span id="LC780" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> If an inert is found, jump to FINISH.</span></span>
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781
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<pre style="margin: 0;">+<span id="LC781" class="line" lang="haskell"></span>
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782
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<pre style="margin: 0;">+<span id="LC782" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">STEP 5. Try the famapp-cache again. Now that we've revealed more information</span></span>
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783
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<pre style="margin: 0;">+<span id="LC783" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in the arguments, the cache might be helpful.</span></span>
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784
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<pre style="margin: 0;">+<span id="LC784" class="line" lang="haskell"></span>
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785
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<pre style="margin: 0;">+<span id="LC785" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> If we get a cache hit, jump to FINISH.</span></span>
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786
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<pre style="margin: 0;">+<span id="LC786" class="line" lang="haskell"></span>
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787
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<pre style="margin: 0;">+<span id="LC787" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">STEP 6. Try top-level instances, which might trigger now that we know more</span></span>
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788
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<pre style="margin: 0;">+<span id="LC788" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> about the argumnents.</span></span>
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789
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<pre style="margin: 0;">+<span id="LC789" class="line" lang="haskell"></span>
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790
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<pre style="margin: 0;">+<span id="LC790" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> If an instance is found, jump to FINISH.</span></span>
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<pre style="margin: 0;">+<span id="LC791" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC792" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">STEP 7. No progress to be made. Return what we have. (Do not do FINISH.)</span></span>
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<pre style="margin: 0;">+<span id="LC793" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC794" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">FINISH 1. We've made a reduction, but the new type may still have more</span></span>
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795
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<pre style="margin: 0;">+<span id="LC795" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> work to do. So flatten the new type.</span></span>
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796
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<pre style="margin: 0;">+<span id="LC796" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC797" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">FINISH 2. Add the result to the famapp-cache, connecting the type we started</span></span>
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<pre style="margin: 0;">+<span id="LC798" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> with to the one we ended with.</span></span>
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<pre style="margin: 0;">+<span id="LC799" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC800" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Because STEP 1/2 and STEP 5/6 happen the same way, they are abstracted into</span></span>
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801
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<pre style="margin: 0;">+<span id="LC801" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">try_to_reduce.</span></span>
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802
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<pre style="margin: 0;">+<span id="LC802" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC803" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">FINISH is naturally implemented in `finish`. But, Note [flatten_exact_fam_app performance]</span></span>
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<pre style="margin: 0;">+<span id="LC804" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">tells us that we should not add to the famapp-cache after STEP 1/2. So `finish`</span></span>
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<pre style="margin: 0;">+<span id="LC805" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is inlined in that case, and only FINISH 1 is performed.</span></span>
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<pre style="margin: 0;">+<span id="LC806" class="line" lang="haskell"></span>
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807
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<pre style="margin: 0;"> <span id="LC807" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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808
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<pre style="margin: 0;"> <span id="LC808" class="line" lang="haskell"></span>
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809
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<pre style="margin: 0;"> <span id="LC809" class="line" lang="haskell"><span class="n" style="color: #333;">flatten_fam_app</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FlatM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Xi</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span><span class="p">)</span></span>
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751
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810
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<pre style="margin: 0;"> <span id="LC810" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- flatten_fam_app can be over-saturated</span></span>
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752
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<pre style="margin: 0;">-<span id="LC752" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- flatten_exact_fam_app<span class="idiff left right">_fully</span> lifts out the application to top level</span></span>
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811
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<pre style="margin: 0;">+<span id="LC811" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- flatten_exact_fam_app<span class="idiff left right"> </span> lifts out the application to top level</span></span>
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753
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812
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<pre style="margin: 0;"> <span id="LC812" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Postcondition: Coercion :: Xi ~ F tys</span></span>
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754
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813
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<pre style="margin: 0;"> <span id="LC813" class="line" lang="haskell"><span class="n" style="color: #333;">flatten_fam_app</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span> <span class="c1" style="color: #998; font-style: italic;">-- Can be over-saturated</span></span>
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<pre style="margin: 0;"> <span id="LC814" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT2</span><span class="p">(</span> <span class="n" style="color: #333;">tys</span> <span class="p">`</span><span class="n" style="color: #333;">lengthAtLeast</span><span class="p">`</span> <span class="n" style="color: #333;">tyConArity</span> <span class="n" style="color: #333;">tc</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">@@ -760,26 +819,27 @@ flatten_fam_app tc tys -- Can be over-saturated</td>
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<pre style="margin: 0;"> <span id="LC819" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in which case the remaining arguments should</span></span>
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<pre style="margin: 0;"> <span id="LC820" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- be dealt with by AppTys</span></span>
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<pre style="margin: 0;"> <span id="LC821" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">tys1</span><span class="p">,</span> <span class="n" style="color: #333;">tys_rest</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitAt</span> <span class="p">(</span><span class="n" style="color: #333;">tyConArity</span> <span class="n" style="color: #333;">tc</span><span class="p">)</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;">-<span id="LC763" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">xi1</span><span class="p">,</span> <span class="n" style="color: #333;">co1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">flatten_exact_fam_app<span class="idiff left right">_fully</span></span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys1</span></span>
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<pre style="margin: 0;">+<span id="LC822" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">xi1</span><span class="p">,</span> <span class="n" style="color: #333;">co1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">flatten_exact_fam_app</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys1</span></span>
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<pre style="margin: 0;"> <span id="LC823" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- co1 :: xi1 ~ F tys1</span></span>
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<pre style="margin: 0;"> <span id="LC824" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC825" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">flatten_app_ty_args</span> <span class="n" style="color: #333;">xi1</span> <span class="n" style="color: #333;">co1</span> <span class="n" style="color: #333;">tys_rest</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC826" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC827" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the [TcType] exactly saturate the TyCon</span></span>
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<pre style="margin: 0;">-<span id="LC769" class="line" lang="haskell"><span class="n" style="color: #333;">flatten_exact_fam_app_fully</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FlatM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Xi</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC770" class="line" lang="haskell"><span class="n" style="color: #333;">flatten_exact_fam_app_fully</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;">+<span id="LC828" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [How to normalise a family application]</span></span>
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<pre style="margin: 0;">+<span id="LC829" class="line" lang="haskell"><span class="n" style="color: #333;">flatten_exact_fam_app</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FlatM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Xi</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC830" class="line" lang="haskell"><span class="n" style="color: #333;">flatten_exact_fam_app</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;"> <span id="LC831" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">checkStackDepth</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC832" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC773" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- S<span class="idiff left right">tep 1</span>. Try to reduce without reducing arguments first.</span></span>
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<pre style="margin: 0;">+<span id="LC833" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- S<span class="idiff left right">TEP 1/2</span>. Try to reduce without reducing arguments first.</span></span>
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774
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834
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<pre style="margin: 0;"> <span id="LC834" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">result1</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">try_to_reduce</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span></span>
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775
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835
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<pre style="margin: 0;"> <span id="LC835" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">result1</span> <span class="kr" style="font-weight: 600;">of</span></span>
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776
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836
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<pre style="margin: 0;"> <span id="LC836" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Don't use `finish`;</span></span>
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777
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<pre style="margin: 0;">-<span id="LC777" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [flatten_exact_fam_app<span class="idiff left right">_fully</span> performance]</span></span>
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837
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<pre style="margin: 0;">+<span id="LC837" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [flatten_exact_fam_app performance]</span></span>
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778
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838
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<pre style="margin: 0;"> <span id="LC838" class="line" lang="haskell"> <span class="p">{</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">co</span><span class="p">,</span> <span class="n" style="color: #333;">xi</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">xi2</span><span class="p">,</span> <span class="n" style="color: #333;">co2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">bumpDepth</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">flatten_one</span> <span class="n" style="color: #333;">xi</span></span>
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779
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839
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<pre style="margin: 0;"> <span id="LC839" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">xi2</span><span class="p">,</span> <span class="n" style="color: #333;">co2</span> <span class="p">`</span><span class="n" style="color: #333;">mkTcTransCo</span><span class="p">`</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="p">}</span></span>
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780
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840
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<pre style="margin: 0;"> <span id="LC840" class="line" lang="haskell"> <span class="p">;</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span></span>
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781
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841
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<pre style="margin: 0;"> <span id="LC841" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC782" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- That didn't work. So reduce the arguments.</span></span>
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<pre style="margin: 0;">+<span id="LC842" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- That didn't work. So reduce the arguments<span class="idiff left right">, in STEP 3</span>.</span></span>
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843
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<pre style="margin: 0;"> <span id="LC843" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">xis</span><span class="p">,</span> <span class="n" style="color: #333;">cos</span><span class="p">,</span> <span class="n" style="color: #333;">kind_co</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">flatten_args_tc</span> <span class="n" style="color: #333;">tc</span> <span class="p">(</span><span class="n" style="color: #333;">repeat</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span><span class="p">)</span> <span class="n" style="color: #333;">tys</span></span>
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844
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<pre style="margin: 0;"> <span id="LC844" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- kind_co :: tcTypeKind(F xis) ~N tcTypeKind(F tys)</span></span>
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845
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<pre style="margin: 0;"> <span id="LC845" 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">@@ -795,6 +855,7 @@ flatten_exact_fam_app_fully tc tys</td>
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855
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<pre style="margin: 0;"> <span id="LC855" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- and co' :: xi' ~r F tys, which is homogeneous</span></span>
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796
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856
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<pre style="margin: 0;"> <span id="LC856" class="line" lang="haskell"> <span class="n" style="color: #333;">homogenise</span> <span class="n" style="color: #333;">xi</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">homogenise_result</span> <span class="n" style="color: #333;">xi</span> <span class="p">(</span><span class="n" style="color: #333;">co</span> <span class="p">`</span><span class="n" style="color: #333;">mkTcTransCo</span><span class="p">`</span> <span class="n" style="color: #333;">args_co</span><span class="p">)</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">kind_co</span></span>
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797
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857
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<pre style="margin: 0;"> <span id="LC857" class="line" lang="haskell"></span>
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858
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<pre style="margin: 0;">+<span id="LC858" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- STEP 4: try the inerts</span></span>
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798
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859
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<pre style="margin: 0;"> <span id="LC859" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">result2</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">liftTcS</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">lookupFamAppInert</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">xis</span></span>
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799
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860
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<pre style="margin: 0;"> <span id="LC860" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">flavour</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getFlavour</span></span>
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<pre style="margin: 0;"> <span id="LC861" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">result2</span> <span class="kr" style="font-weight: 600;">of</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">@@ -813,11 +874,11 @@ flatten_exact_fam_app_fully tc tys</td>
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<pre style="margin: 0;"> <span id="LC874" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC875" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span></span>
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876
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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="LC816" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- inert didn't work. Try to reduce again</span></span>
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<pre style="margin: 0;">+<span id="LC877" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- inert didn't work. Try to reduce again<span class="idiff left right">, in STEP 5/6.</span></span></span>
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817
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878
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<pre style="margin: 0;"> <span id="LC878" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">result3</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">try_to_reduce</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">xis</span></span>
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879
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<pre style="margin: 0;"> <span id="LC879" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">result3</span> <span class="kr" style="font-weight: 600;">of</span></span>
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819
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880
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<pre style="margin: 0;"> <span id="LC880" 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;">co</span><span class="p">,</span> <span class="n" style="color: #333;">xi</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">finish</span> <span class="p">(</span><span class="n" style="color: #333;">homogenise</span> <span class="n" style="color: #333;">xi</span> <span class="n" style="color: #333;">co</span><span class="p">)</span></span>
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820
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<pre style="margin: 0;">-<span id="LC820" 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="c1" style="color: #998; font-style: italic;">-- we have made no progress at all</span></span>
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<pre style="margin: 0;">+<span id="LC881" 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="c1" style="color: #998; font-style: italic;">-- we have made no progress at all<span class="idiff left right">: STEP 7.</span></span></span>
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<pre style="margin: 0;"> <span id="LC882" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">homogenise</span> <span class="n" style="color: #333;">reduced</span> <span class="p">(</span><span class="n" style="color: #333;">mkTcReflCo</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">reduced</span><span class="p">))</span></span>
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883
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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>
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<pre style="margin: 0;"> <span id="LC884" class="line" lang="haskell"> <span class="n" style="color: #333;">reduced</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">xis</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">@@ -825,10 +886,13 @@ flatten_exact_fam_app_fully tc tys</td>
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886
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<pre style="margin: 0;"> <span id="LC886" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- call this if the above attempts made progress.</span></span>
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826
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887
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<pre style="margin: 0;"> <span id="LC887" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This recursively flattens the result and then adds to the cache</span></span>
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888
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<pre style="margin: 0;"> <span id="LC888" class="line" lang="haskell"> <span class="n" style="color: #333;">finish</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Xi</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FlatM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Xi</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC828" class="line" lang="haskell"> <span class="n" style="color: #333;">finish</span> <span class="p">(</span><span class="n" style="color: #333;">xi</span><span class="p">,</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">fully</span><span class="p">,</span> <span class="n" style="color: #333;">fully_co</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">bumpDepth</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">flatten_one</span> <span class="n" style="color: #333;">xi</span></span>
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<pre style="margin: 0;">+<span id="LC889" class="line" lang="haskell"> <span class="n" style="color: #333;">finish</span> <span class="p">(</span><span class="n" style="color: #333;">xi</span><span class="p">,</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="c1" style="color: #998; font-style: italic;">-- flatten the result: FINISH 1</span></span>
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<pre style="margin: 0;">+<span id="LC890" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">fully</span><span class="p">,</span> <span class="n" style="color: #333;">fully_co</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">bumpDepth</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">flatten_one</span> <span class="n" style="color: #333;">xi</span></span>
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891
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<pre style="margin: 0;"> <span id="LC891" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">final_co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fully_co</span> <span class="p">`</span><span class="n" style="color: #333;">mkTcTransCo</span><span class="p">`</span> <span class="n" style="color: #333;">co</span></span>
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892
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<pre style="margin: 0;"> <span id="LC892" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">eq_rel</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getEqRel</span></span>
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893
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<pre style="margin: 0;"> <span id="LC893" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">flavour</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getFlavour</span></span>
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<pre style="margin: 0;">+<span id="LC894" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC895" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- extend the cache: FINISH 2</span></span>
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896
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<pre style="margin: 0;"> <span id="LC896" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">eq_rel</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">NomEq</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">flavour</span> <span class="o" style="font-weight: 600;">/=</span> <span class="kt" style="color: #458; font-weight: 600;">Derived</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC897" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the cache only wants Nominal eqs</span></span>
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<pre style="margin: 0;"> <span id="LC898" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- and Wanteds can rewrite Deriveds; the cache</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">@@ -837,12 +901,15 @@ flatten_exact_fam_app_fully tc tys</td>
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901
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<pre style="margin: 0;"> <span id="LC901" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">fully</span><span class="p">,</span> <span class="n" style="color: #333;">final_co</span><span class="p">)</span> <span class="p">}</span></span>
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902
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<pre style="margin: 0;"> <span id="LC902" class="line" lang="haskell"></span>
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903
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<pre style="margin: 0;"> <span id="LC903" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returned coercion is output ~r input, where r is the role in the FlatM monad</span></span>
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<pre style="margin: 0;">+<span id="LC904" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [How to normalise a family application]</span></span>
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905
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<pre style="margin: 0;"> <span id="LC905" class="line" lang="haskell"><span class="n" style="color: #333;">try_to_reduce</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FlatM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcCoercion</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">))</span></span>
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906
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<pre style="margin: 0;"> <span id="LC906" class="line" lang="haskell"><span class="n" style="color: #333;">try_to_reduce</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span></span>
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842
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<pre style="margin: 0;">-<span id="LC842" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">liftTcS</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">firstJustsM</span> <span class="p">[</span> <span class="n" style="color: #333;">lookupFamAppCache</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span></span>
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843
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<pre style="margin: 0;">-<span id="LC843" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">matchFam</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span> <span class="p">]</span></span>
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907
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<pre style="margin: 0;">+<span id="LC907" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">liftTcS</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">firstJustsM</span> <span class="p">[</span> <span class="n" style="color: #333;">lookupFamAppCache</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span><span class="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- STEP 5</span></span></span>
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908
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<pre style="margin: 0;">+<span id="LC908" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">matchFam</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span> <span class="p">]</span><span class="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- STEP 6</span></span></span>
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909
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<pre style="margin: 0;"> <span id="LC909" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">downgrade</span> <span class="n" style="color: #333;">result</span> <span class="p">}</span></span>
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910
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<pre style="margin: 0;"> <span id="LC910" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC911" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The result above is always Nominal. We might want a Representational</span></span>
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<pre style="margin: 0;">+<span id="LC912" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- coercion; this downgrades (and prints, out of convenience).</span></span>
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913
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<pre style="margin: 0;"> <span id="LC913" class="line" lang="haskell"> <span class="n" style="color: #333;">downgrade</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcCoercionN</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FlatM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcCoercion</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC914" class="line" lang="haskell"> <span class="n" style="color: #333;">downgrade</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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915
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<pre style="margin: 0;"> <span id="LC915" class="line" lang="haskell"> <span class="n" style="color: #333;">downgrade</span> <span class="n" style="color: #333;">result</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">co</span><span class="p">,</span> <span class="n" style="color: #333;">xi</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">@@ -991,8 +1058,6 @@ split_pi_tys' ty = split ty ty</td>
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1058
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<pre style="margin: 0;"> <span id="LC1058" class="line" lang="haskell"> <span class="n" style="color: #333;">split</span> <span class="n" style="color: #333;">orig_ty</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span> <span class="n" style="color: #333;">orig_ty</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">)</span></span>
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1059
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<pre style="margin: 0;"> <span id="LC1059" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINE split_pi_tys' #-}</span></span>
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1060
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<pre style="margin: 0;"> <span id="LC1060" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC994" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC995" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1061" class="line" lang="haskell"><span class="cd">-- | Like 'tyConBindersTyCoBinders' but you also get a 'Bool' which is true iff</span></span>
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1062
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<pre style="margin: 0;"> <span id="LC1062" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- there is at least one named binder.</span></span>
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1063
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<pre style="margin: 0;"> <span id="LC1063" class="line" lang="haskell"><span class="n" style="color: #333;">ty_con_binders_ty_binders'</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyConBinder</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;">TyCoBinder</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/ef7479323a85c965b50fb2dfd71f537872cedab1...78425e2e6d50575111568a2e6f9d8e7f7e8bae22#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">@@ -2096,7 +2096,7 @@ The partial solution is that:</td>
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<pre style="margin: 0;"> <span id="LC2096" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The end effect is that, much as we do for overlapping instances, we</span></span>
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2097
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<pre style="margin: 0;"> <span id="LC2097" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">delay choosing a class instance if there is a possibility of another</span></span>
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<pre style="margin: 0;"> <span id="LC2098" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">instance OR a given to match our constraint later on. This fixes</span></span>
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<pre style="margin: 0;">-<span id="LC2099" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">#4981 and #5002.</span></span>
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<pre style="margin: 0;">+<span id="LC2099" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">tickets </span>#4981 and #5002.</span></span>
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<pre style="margin: 0;"> <span id="LC2100" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2101" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Other notes:</span></span>
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2102
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<pre style="margin: 0;"> <span id="LC2102" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/ef7479323a85c965b50fb2dfd71f537872cedab1...78425e2e6d50575111568a2e6f9d8e7f7e8bae22#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">@@ -802,6 +802,7 @@ Proof. By property (R2), with f1=f2</td>
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802
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802
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<pre style="margin: 0;"> <span id="LC802" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Definition [Generalised substitution]</span></span>
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803
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803
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<pre style="margin: 0;"> <span id="LC803" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">A "generalised substitution" S is a set of triples (t0 -f-> t), where</span></span>
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804
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804
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<pre style="margin: 0;"> <span id="LC804" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> t0 is a type variable or an exactly-saturated type family application</span></span>
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805
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<pre style="margin: 0;">+<span id="LC805" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (that is, t0 is a CanEqLHS)</span></span>
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806
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<pre style="margin: 0;"> <span id="LC806" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> t is a type</span></span>
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806
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807
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<pre style="margin: 0;"> <span id="LC807" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f is a flavour</span></span>
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808
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<pre style="margin: 0;"> <span id="LC808" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">such that</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">@@ -876,7 +877,7 @@ Main Theorem [Stability under extension]</td>
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876
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877
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<pre style="margin: 0;"> <span id="LC877" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> AND (K3) See Note [K3: completeness of solving]</span></span>
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877
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878
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<pre style="margin: 0;"> <span id="LC878" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> { (K3a) If the role of fs is nominal: s /= t0</span></span>
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879
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<pre style="margin: 0;"> <span id="LC879" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (K3b) If the role of fs is representational:</span></span>
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<pre style="margin: 0;">-<span id="LC879" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> s is not of form (<span class="idiff left right">a</span> t1 .. tn) } }</span></span>
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<pre style="margin: 0;">+<span id="LC880" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> s is not of form (<span class="idiff left right">t0</span> t1 .. tn) } }</span></span>
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881
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<pre style="margin: 0;"> <span id="LC881" class="line" lang="haskell"></span>
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882
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<pre style="margin: 0;"> <span id="LC882" class="line" lang="haskell"></span>
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882
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883
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<pre style="margin: 0;"> <span id="LC883" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Conditions (T1-T3) are established by the canonicaliser</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">@@ -1149,6 +1150,9 @@ Additional notes:</td>
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1149
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1150
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<pre style="margin: 0;"> <span id="LC1150" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * inert_dicts is a finite map keyed by</span></span>
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1150
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1151
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<pre style="margin: 0;"> <span id="LC1151" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the type; it's inconvenient for it to map to TWO constraints</span></span>
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1151
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1152
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<pre style="margin: 0;"> <span id="LC1152" class="line" lang="haskell"></span>
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1153
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<pre style="margin: 0;">+<span id="LC1153" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Another example requiring Deriveds is in</span></span>
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1154
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<pre style="margin: 0;">+<span id="LC1154" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Put touchable variables on the left] in GHC.Tc.Solver.Canonical.</span></span>
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<pre style="margin: 0;">+<span id="LC1155" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1156" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Splitting WD constraints]</span></span>
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1157
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<pre style="margin: 0;"> <span id="LC1157" 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="LC1158" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We are about to add a [WD] constraint to the inert set; and 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">@@ -1774,7 +1778,7 @@ kick_out_rewritable new_fr new_lhs</td>
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<pre style="margin: 0;"> <span id="LC1778" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">fr_can_rewrite_ty</span> <span class="n" style="color: #333;">eq_rel</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="c1" style="color: #998; font-style: italic;">-- (K2d)</span></span>
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1779
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<pre style="margin: 0;"> <span id="LC1779" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (K2c) is guaranteed by the first guard of keep_eq</span></span>
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1780
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<pre style="margin: 0;"> <span id="LC1780" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1777" class="line" lang="haskell"> <span class="n" style="color: #333;">kick_out_for_completeness</span></span>
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<pre style="margin: 0;">+<span id="LC1781" class="line" lang="haskell"> <span class="n" style="color: #333;">kick_out_for_completeness</span><span class="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- (K3) and Note [K3: completeness of solving]</span></span></span>
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1778
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1782
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<pre style="margin: 0;"> <span id="LC1782" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="p">(</span><span class="n" style="color: #333;">eq_rel</span><span class="p">,</span> <span class="n" style="color: #333;">new_lhs</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1779
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1783
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<pre style="margin: 0;"> <span id="LC1783" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">NomEq</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;">rhs_ty</span> <span class="p">`</span><span class="n" style="color: #333;">eqType</span><span class="p">`</span> <span class="n" style="color: #333;">canEqLHSType</span> <span class="n" style="color: #333;">new_lhs</span></span>
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1784
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<pre style="margin: 0;"> <span id="LC1784" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ReprEq</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TyVarLHS</span> <span class="n" style="color: #333;">new_tv</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">isTyVarHead</span> <span class="n" style="color: #333;">new_tv</span> <span class="n" style="color: #333;">rhs_ty</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">@@ -1815,6 +1819,8 @@ kickOutAfterFillingCoercionHole hole filled_co</td>
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1819
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<pre style="margin: 0;"> <span id="LC1819" class="line" lang="haskell"></span>
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1820
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<pre style="margin: 0;"> <span id="LC1820" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">setInertCans</span> <span class="n" style="color: #333;">ics'</span> <span class="p">}</span></span>
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1817
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1821
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<pre style="margin: 0;"> <span id="LC1821" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC1822" class="line" lang="haskell"> <span class="n" style="color: #333;">holes_of_co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">coercionHolesOfCo</span> <span class="n" style="color: #333;">filled_co</span></span>
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1823
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<pre style="margin: 0;">+<span id="LC1823" class="line" lang="haskell"></span>
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1818
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1824
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<pre style="margin: 0;"> <span id="LC1824" class="line" lang="haskell"> <span class="n" style="color: #333;">kick_out</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">InertCans</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WorkList</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">InertCans</span><span class="p">)</span></span>
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1819
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1825
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<pre style="margin: 0;"> <span id="LC1825" class="line" lang="haskell"> <span class="n" style="color: #333;">kick_out</span> <span class="n" style="color: #333;">ics</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IC</span> <span class="p">{</span> <span class="n" style="color: #333;">inert_irreds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">irreds</span> <span class="p">})</span></span>
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1820
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1826
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<pre style="margin: 0;"> <span id="LC1826" 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;">to_kick</span><span class="p">,</span> <span class="n" style="color: #333;">to_keep</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">partitionBagWith</span> <span class="n" style="color: #333;">kick_ct</span> <span class="n" style="color: #333;">irreds</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">@@ -1830,7 +1836,7 @@ kickOutAfterFillingCoercionHole hole filled_co</td>
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1836
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<pre style="margin: 0;"> <span id="LC1836" class="line" lang="haskell"> <span class="n" style="color: #333;">kick_ct</span> <span class="n" style="color: #333;">ct</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CIrredCan</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_status</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">BlockedCIS</span> <span class="n" style="color: #333;">holes</span> <span class="p">})</span></span>
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1831
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1837
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<pre style="margin: 0;"> <span id="LC1837" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">hole</span> <span class="p">`</span><span class="n" style="color: #333;">elementOfUniqSet</span><span class="p">`</span> <span class="n" style="color: #333;">holes</span></span>
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1832
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1838
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<pre style="margin: 0;"> <span id="LC1838" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">new_holes</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">holes</span> <span class="p">`</span><span class="n" style="color: #333;">delOneFromUniqSet</span><span class="p">`</span> <span class="n" style="color: #333;">hole</span></span>
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1833
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<pre style="margin: 0;">-<span id="LC1833" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">unionUniqSets</span><span class="p">`</span> <span class="n" style="color: #333;"><span class="idiff left">coercionHolesOfCo</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">filled</span>_co</span></span>
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<pre style="margin: 0;">+<span id="LC1839" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">unionUniqSets</span><span class="p">`</span> <span class="n" style="color: #333;"><span class="idiff left right">holes_of</span>_co</span></span>
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1834
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1840
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<pre style="margin: 0;"> <span id="LC1840" class="line" lang="haskell"> <span class="n" style="color: #333;">updated_ct</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ct</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_status</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">BlockedCIS</span> <span class="n" style="color: #333;">new_holes</span> <span class="p">}</span></span>
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1835
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1841
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<pre style="margin: 0;"> <span id="LC1841" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span></span>
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1836
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1842
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<pre style="margin: 0;"> <span id="LC1842" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">isEmptyUniqSet</span> <span class="n" style="color: #333;">new_holes</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">@@ -2238,14 +2244,15 @@ We must determine whether a Given might later match a Wanted. We</td>
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2244
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<pre style="margin: 0;"> <span id="LC2244" 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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2245
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<pre style="margin: 0;"> <span id="LC2245" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in the Wanted might be arbitrarily instantiated. We do *not* want</span></span>
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2246
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<pre style="margin: 0;"> <span id="LC2246" 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="LC2241" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">type family applications?</span></span>
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<pre style="margin: 0;">+<span id="LC2247" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">type family applications?<span class="idiff left right"> (Examples are below the explanation.)</span></span></span>
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2242
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<pre style="margin: 0;"> <span id="LC2248" class="line" lang="haskell"></span>
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2243
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2249
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<pre style="margin: 0;"> <span id="LC2249" 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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<pre style="margin: 0;">-<span id="LC2244" 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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2250
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<pre style="margin: 0;">+<span id="LC2250" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the Core flattener. See</span></span>
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<pre style="margin: 0;">+<span id="LC2251" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Flattening type-family applications when matching instances] in GHC.Core.Unify.</span></span>
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2245
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2252
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<pre style="margin: 0;"> <span id="LC2252" 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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2253
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<pre style="margin: 0;"> <span id="LC2253" 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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<pre style="margin: 0;"> <span id="LC2254" 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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<pre style="margin: 0;">-<span id="LC2248" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">variables in the dom<span class="idiff left right">ia</span>n of a unifying substitution?</span></span>
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2255
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<pre style="margin: 0;">+<span id="LC2255" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">variables in the dom<span class="idiff left right">ai</span>n of a unifying substitution?</span></span>
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2249
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2256
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<pre style="margin: 0;"> <span id="LC2256" class="line" lang="haskell"></span>
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2250
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2257
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<pre style="margin: 0;"> <span id="LC2257" 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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2251
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2258
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<pre style="margin: 0;"> <span id="LC2258" 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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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2256,6 +2263,30 @@ we use BindMe to tell the unifier to allow it in the substitution.</td>
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2256
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2263
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<pre style="margin: 0;"> <span id="LC2263" 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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2257
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2264
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<pre style="margin: 0;"> <span id="LC2264" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">considered rigid.</span></span>
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2258
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2265
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<pre style="margin: 0;"> <span id="LC2265" class="line" lang="haskell"></span>
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2266
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<pre style="margin: 0;">+<span id="LC2266" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Examples:</span></span>
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2267
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<pre style="margin: 0;">+<span id="LC2267" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [G] C a</span></span>
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2268
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<pre style="margin: 0;">+<span id="LC2268" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] C alpha</span></span>
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2269
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<pre style="margin: 0;">+<span id="LC2269" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> This easily might match later.</span></span>
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2270
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<pre style="margin: 0;">+<span id="LC2270" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2271" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [G] C a</span></span>
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2272
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<pre style="margin: 0;">+<span id="LC2272" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] C (F alpha)</span></span>
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2273
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<pre style="margin: 0;">+<span id="LC2273" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> This might match later, too, but we need to flatten the (F alpha)</span></span>
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2274
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<pre style="margin: 0;">+<span id="LC2274" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> to a fresh variable so that the unifier can connect the two.</span></span>
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2275
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<pre style="margin: 0;">+<span id="LC2275" class="line" lang="haskell"></span>
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2276
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<pre style="margin: 0;">+<span id="LC2276" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [G] C (F alpha)</span></span>
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2277
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<pre style="margin: 0;">+<span id="LC2277" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] C a</span></span>
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2278
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<pre style="margin: 0;">+<span id="LC2278" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> This also might match later. Again, we will need to flatten to</span></span>
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2279
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<pre style="margin: 0;">+<span id="LC2279" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> find this out. (Surprised about a metavariable in a Given? See</span></span>
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2280
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<pre style="margin: 0;">+<span id="LC2280" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> #18929.)</span></span>
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<pre style="margin: 0;">+<span id="LC2281" class="line" lang="haskell"></span>
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2282
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<pre style="margin: 0;">+<span id="LC2282" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [G] C (F a)</span></span>
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2283
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<pre style="margin: 0;">+<span id="LC2283" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] C a</span></span>
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2284
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<pre style="margin: 0;">+<span id="LC2284" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> This won't match later. We're not going to get new Givens that</span></span>
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2285
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<pre style="margin: 0;">+<span id="LC2285" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> can inform the F a, and so this is a no-go.</span></span>
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2286
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<pre style="margin: 0;">+<span id="LC2286" class="line" lang="haskell"></span>
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2287
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<pre style="margin: 0;">+<span id="LC2287" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This treatment fixes #18910 and is tested in</span></span>
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2288
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<pre style="margin: 0;">+<span id="LC2288" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">typecheck/should_compile/InstanceGivenOverlap{,2}</span></span>
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2289
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<pre style="margin: 0;">+<span id="LC2289" class="line" lang="haskell"></span>
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2290
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<pre style="margin: 0;"> <span id="LC2290" 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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2260
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2291
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<pre style="margin: 0;"> <span id="LC2291" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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2292
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<pre style="margin: 0;"> <span id="LC2292" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider an implication</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="3630" 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">@@ -3599,7 +3630,7 @@ breakTyVarCycle loc = go</td>
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3599
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<pre style="margin: 0;"> <span id="LC3630" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Rep</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">ForAllTy</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">ty</span> <span class="c1" style="color: #998; font-style: italic;">-- See Detail (1) of Note</span></span>
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3600
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3631
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<pre style="margin: 0;"> <span id="LC3631" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Rep</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">CoercionTy</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">ty</span> <span class="c1" style="color: #998; font-style: italic;">-- See Detail (2) of Note</span></span>
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3601
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3632
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<pre style="margin: 0;"> <span id="LC3632" class="line" lang="haskell"></span>
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3602
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<pre style="margin: 0;">-<span id="LC3602" class="line" lang="haskell"><span class="cd">-- | Fill<span class="idiff left right">i</span> in CycleBreakerTvs with the variables they stand for.</span></span>
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3633
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<pre style="margin: 0;">+<span id="LC3633" class="line" lang="haskell"><span class="cd">-- | Fill in CycleBreakerTvs with the variables they stand for.</span></span>
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3603
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3634
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<pre style="margin: 0;"> <span id="LC3634" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Type variable cycles in Givens] in GHC.Tc.Solver.Canonical.</span></span>
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3604
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3635
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<pre style="margin: 0;"> <span id="LC3635" class="line" lang="haskell"><span class="n" style="color: #333;">restoreTyVarCycles</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">InertSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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3605
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3636
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<pre style="margin: 0;"> <span id="LC3636" class="line" lang="haskell"><span class="n" style="color: #333;">restoreTyVarCycles</span> <span class="n" style="color: #333;">is</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="3640" 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">@@ -3609,6 +3640,7 @@ restoreTyVarCycles is</td>
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3609
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3640
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<pre style="margin: 0;"> <span id="LC3640" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Unwrap a type synonym only when either:</span></span>
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<pre style="margin: 0;"> <span id="LC3641" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The type synonym is forgetful, or</span></span>
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<pre style="margin: 0;"> <span id="LC3642" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the type synonym mentions a type family in its expansion</span></span>
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<pre style="margin: 0;">+<span id="LC3643" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Flattening synonyms] in GHC.Tc.Solver.Flatten.</span></span>
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3644
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<pre style="margin: 0;"> <span id="LC3644" class="line" lang="haskell"><span class="n" style="color: #333;">flattenView</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span></span>
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3645
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<pre style="margin: 0;"> <span id="LC3645" class="line" lang="haskell"><span class="n" style="color: #333;">flattenView</span> <span class="n" style="color: #333;">ty</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Rep</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">TyConApp</span> <span class="n" style="color: #333;">tc</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC3646" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isForgetfulSynTyCon</span> <span class="n" style="color: #333;">tc</span> <span class="o" style="font-weight: 600;">||</span> <span class="p">(</span><span class="n" style="color: #333;">isTypeSynonymTyCon</span> <span class="n" style="color: #333;">tc</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isFamFreeTyCon</span> <span class="n" style="color: #333;">tc</span><span class="p">))</span></span>
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<li id="3b6d78a50c8462304f843b952a88e531718dbbd2">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/ef7479323a85c965b50fb2dfd71f537872cedab1...78425e2e6d50575111568a2e6f9d8e7f7e8bae22#3b6d78a50c8462304f843b952a88e531718dbbd2"><strong>compiler/GHC/Tc/Types/Constraint.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -113,6 +113,36 @@ import qualified Data.Semigroup ( (<>) )</td>
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<pre style="margin: 0;"> <span id="LC113" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* These are the constraints the low-level simplifier works with *</span></span>
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<pre style="margin: 0;"> <span id="LC114" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<pre style="margin: 0;"> <span id="LC115" 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="LC116" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC117" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [CEqCan occurs check]</span></span>
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<pre style="margin: 0;">+<span id="LC118" 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="LC119" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">A CEqCan relates a CanEqLHS (a type variable or type family applications) on</span></span>
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<pre style="margin: 0;">+<span id="LC120" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">its left to an arbitrary type on its right. It is used for rewriting, in the</span></span>
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<pre style="margin: 0;">+<span id="LC121" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">flattener. Because it is used for rewriting, it would be disastrous if the RHS</span></span>
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<pre style="margin: 0;">+<span id="LC122" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">were to mention the LHS: this would cause a loop in rewriting.</span></span>
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<pre style="margin: 0;">+<span id="LC123" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC124" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We thus perform an occurs-check. There is, of course, some subtlety:</span></span>
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<pre style="margin: 0;">+<span id="LC125" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC126" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* For type variables, the occurs-check looks deeply. This is because</span></span>
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<pre style="margin: 0;">+<span id="LC127" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a CEqCan over a meta-variable is also used to inform unification,</span></span>
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<pre style="margin: 0;">+<span id="LC128" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in GHC.Tc.Solver.Interact.solveByUnification. If the LHS appears</span></span>
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<pre style="margin: 0;">+<span id="LC129" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> anywhere, at all, in the RHS, unification will create an infinite</span></span>
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130
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<pre style="margin: 0;">+<span id="LC130" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> structure, which is bad.</span></span>
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131
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<pre style="margin: 0;">+<span id="LC131" class="line" lang="haskell"></span>
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132
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<pre style="margin: 0;">+<span id="LC132" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* For type family applications, the occurs-check is shallow; it looks</span></span>
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133
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<pre style="margin: 0;">+<span id="LC133" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> only in places where we might rewrite. (Specifically, it does not</span></span>
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134
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<pre style="margin: 0;">+<span id="LC134" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> look in kinds or coercions.) An occurrence of the LHS in, say, an</span></span>
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135
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<pre style="margin: 0;">+<span id="LC135" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> RHS coercion is OK, as we do not rewrite in coercions. No loop to</span></span>
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136
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<pre style="margin: 0;">+<span id="LC136" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> be found.</span></span>
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137
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<pre style="margin: 0;">+<span id="LC137" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC138" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> You might also worry about the possibility that a type family</span></span>
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139
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<pre style="margin: 0;">+<span id="LC139" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> application LHS doesn't exactly appear in the RHS, but something</span></span>
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140
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<pre style="margin: 0;">+<span id="LC140" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> that reduces to the LHS does. Yet that can't happen: the RHS is</span></span>
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<pre style="margin: 0;">+<span id="LC141" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> already inert, with all type family redexes reduced. So a simple</span></span>
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142
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<pre style="margin: 0;">+<span id="LC142" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> syntactic check is just fine.</span></span>
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<pre style="margin: 0;">+<span id="LC143" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC144" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The occurs check is performed in GHC.Tc.Utils.Unify.checkTypeEq.</span></span>
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<pre style="margin: 0;">+<span id="LC145" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC146" 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="LC147" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC148" class="line" lang="haskell"><span class="cd">-- | A 'Xi'-type is one that has been fully rewritten with respect</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">@@ -157,8 +187,7 @@ data Ct</td>
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<pre style="margin: 0;"> <span id="LC187" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * See Note [inert_eqs: the inert equalities] in GHC.Tc.Solver.Monad</span></span>
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<pre style="margin: 0;"> <span id="LC188" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * Many are checked in checkTypeEq in GHC.Tc.Utils.Unify</span></span>
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<pre style="margin: 0;"> <span id="LC189" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * (TyEq:OC) lhs does not occur in rhs (occurs check)</span></span>
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<pre style="margin: 0;">-<span id="LC160" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (skips coercions if the lhs is a type family application, because</span></span>
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<pre style="margin: 0;">-<span id="LC161" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we don't rewrite type families in coercions)</span></span>
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190
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<pre style="margin: 0;">+<span id="LC190" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [CEqCan occurs check]</span></span>
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<pre style="margin: 0;"> <span id="LC191" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * (TyEq:F) rhs has no foralls</span></span>
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192
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<pre style="margin: 0;"> <span id="LC192" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (this avoids substituting a forall for the tyvar in other types)</span></span>
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<pre style="margin: 0;"> <span id="LC193" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * (TyEq:K) tcTypeKind lhs `tcEqKind` tcTypeKind rhs; Note [Ct kind invariant]</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">@@ -243,6 +272,8 @@ data HoleSort = ExprHole Id</td>
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272
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<pre style="margin: 0;"> <span id="LC272" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ A hole in a type (PartialTypeSignatures)</span></span>
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<pre style="margin: 0;"> <span id="LC273" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ConstraintHole</span></span>
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<pre style="margin: 0;"> <span id="LC274" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ A hole in a constraint, like @f :: (_, Eq a) => ...</span></span>
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<pre style="margin: 0;">+<span id="LC275" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Differentiated from TypeHole because a ConstraintHole</span></span>
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<pre style="margin: 0;">+<span id="LC276" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- is simplified differently. See GHC.Tc.Solver.simplifyHoles.</span></span>
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<pre style="margin: 0;"> <span id="LC277" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC278" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">Hole</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC279" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Hole</span> <span class="p">{</span> <span class="n" style="color: #333;">hole_sort</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ExprHole</span> <span class="n" style="color: #333;">id</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1141,8 +1172,9 @@ data ImplicStatus</td>
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1141
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1172
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<pre style="margin: 0;"> <span id="LC1172" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">IC_Unsolved</span> <span class="c1" style="color: #998; font-style: italic;">-- Neither of the above; might go either way</span></span>
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<pre style="margin: 0;"> <span id="LC1173" class="line" lang="haskell"></span>
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1143
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<pre style="margin: 0;"> <span id="LC1174" class="line" lang="haskell"><span class="cd">-- | Does this implication have Given equalities?</span></span>
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1144
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<pre style="margin: 0;">-<span id="LC1144" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [When does an implication have given equalities?] in GHC.Tc.Solver.Monad</span></span>
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1145
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<pre style="margin: 0;">-<span id="LC1145" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- and Note [Suppress redundant givens during error reporting] in GHC.Tc.Errors</span></span>
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<pre style="margin: 0;">+<span id="LC1175" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [When does an implication have given equalities?] in GHC.Tc.Solver.Monad,</span></span>
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<pre style="margin: 0;">+<span id="LC1176" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- which also explains why we need three options here. Also, see</span></span>
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1177
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<pre style="margin: 0;">+<span id="LC1177" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note [Suppress redundant givens during error reporting] in GHC.Tc.Errors</span></span>
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<pre style="margin: 0;"> <span id="LC1178" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">HasGivenEqs</span></span>
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1147
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1179
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<pre style="margin: 0;"> <span id="LC1179" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NoGivenEqs</span> <span class="c1" style="color: #998; font-style: italic;">-- definitely no given equalities</span></span>
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1180
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<pre style="margin: 0;"> <span id="LC1180" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">LocalGivenEqs</span> <span class="c1" style="color: #998; font-style: italic;">-- might have Given equalities that affect only local skolems</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/ef7479323a85c965b50fb2dfd71f537872cedab1...78425e2e6d50575111568a2e6f9d8e7f7e8bae22#94c96afe1bb3b771ffbcfeeca34ce43ebbe76ccb"><strong>compiler/GHC/Tc/Utils/TcMType.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">@@ -2169,7 +2169,8 @@ Why?, for example:</td>
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<pre style="margin: 0;"> <span id="LC2169" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">- For CIrredCan we want to see if a constraint is insoluble with insolubleWC</span></span>
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2170
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<pre style="margin: 0;"> <span id="LC2170" class="line" lang="haskell"></span>
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2171
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2171
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<pre style="margin: 0;"> <span id="LC2171" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">On the other hand, we change CEqCan to CNonCanonical, because of all of</span></span>
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2172
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<pre style="margin: 0;">-<span id="LC2172" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">CEqCan's invariants, which can break during zonking. Besides, the constraint</span></span>
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2172
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<pre style="margin: 0;">+<span id="LC2172" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">CEqCan's invariants, which can break during zonking. (Example: a ~R alpha, where</span></span>
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2173
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<pre style="margin: 0;">+<span id="LC2173" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we have alpha := N Int, where N is a newtype.) Besides, the constraint</span></span>
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2173
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2174
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<pre style="margin: 0;"> <span id="LC2174" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">will be canonicalised again, so there is little benefit in keeping the</span></span>
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2174
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2175
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<pre style="margin: 0;"> <span id="LC2175" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">CEqCan structure.</span></span>
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2176
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<pre style="margin: 0;"> <span id="LC2176" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/ef7479323a85c965b50fb2dfd71f537872cedab1...78425e2e6d50575111568a2e6f9d8e7f7e8bae22#74295edeac870ee7f2f3484ebaffab5c948b735a"><strong>compiler/GHC/Tc/Utils/Unify.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1976,7 +1976,8 @@ checkTyFamEq dflags fun_tc fun_args ty</td>
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1976
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1976
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<pre style="margin: 0;"> <span id="LC1976" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">inline</span> <span class="n" style="color: #333;">checkTypeEq</span> <span class="n" style="color: #333;">dflags</span> <span class="kt" style="color: #458; font-weight: 600;">YesTypeFamilies</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyFamLHS</span> <span class="n" style="color: #333;">fun_tc</span> <span class="n" style="color: #333;">fun_args</span><span class="p">)</span> <span class="n" style="color: #333;">ty</span></span>
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1977
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1977
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<pre style="margin: 0;"> <span id="LC1977" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- inline checkTypeEq so that the `case`s over the CanEqLHS get blasted away</span></span>
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1978
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1978
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<pre style="margin: 0;"> <span id="LC1978" class="line" lang="haskell"></span>
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1979
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<pre style="margin: 0;">-<span id="LC1979" class="line" lang="haskell"><span class="n" style="color: #333;">checkTypeEq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">AreTypeFamiliesOK</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CanEqLHS</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MetaTyVarUpdateResult</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1979
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<pre style="margin: 0;">+<span id="LC1979" class="line" lang="haskell"><span class="n" style="color: #333;">checkTypeEq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">AreTypeFamiliesOK</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CanEqLHS</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span></span>
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1980
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<pre style="margin: 0;">+<span id="LC1980" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MetaTyVarUpdateResult</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1980
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1981
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<pre style="margin: 0;"> <span id="LC1981" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Checks the invariants for CEqCan. In particular:</span></span>
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1981
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1982
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<pre style="margin: 0;"> <span id="LC1982" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (a) a forall type (forall a. blah)</span></span>
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<td class="diff-line-num old_line" data-linenumber="1982" 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">
1982
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<td class="diff-line-num new_line" data-linenumber="1983" 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">
1983
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<pre style="margin: 0;"> <span id="LC1983" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (b) a predicate type (c => ty)</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1987" 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="1988" 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">@@ -1987,13 +1988,7 @@ checkTypeEq :: DynFlags -> AreTypeFamiliesOK -> CanEqLHS -> TcType -> MetaTyVarU</td>
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<td class="diff-line-num old_line" data-linenumber="1987" 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">
1987
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<td class="diff-line-num new_line" data-linenumber="1988" 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">
1988
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<pre style="margin: 0;"> <span id="LC1988" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- For (a), (b), and (c) we check only the top level of the type, NOT</span></span>
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<td class="diff-line-num old_line" data-linenumber="1988" 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">
1988
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<td class="diff-line-num new_line" data-linenumber="1989" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1989
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<pre style="margin: 0;"> <span id="LC1989" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- inside the kinds of variables it mentions. For (d) we look deeply</span></span>
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<td class="diff-line-num old_line" data-linenumber="1989" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1989
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<td class="diff-line-num new_line" data-linenumber="1990" 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">
1990
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<pre style="margin: 0;"> <span id="LC1990" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- in coercions when the LHS is a tyvar (but skip coercions for type family</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1990" 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">
1990
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<td class="diff-line-num new_line old" data-linenumber="1991" 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="LC1990" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- LHSs), and for (e) we do look in the kinds of course.</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1991" 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">
1991
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<td class="diff-line-num new_line old" data-linenumber="1991" 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="LC1991" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1992" 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">
1992
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<td class="diff-line-num new_line old" data-linenumber="1991" 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="LC1992" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Why skip coercions for type families? Because we don't rewrite type family</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1993" 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">
1993
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<td class="diff-line-num new_line old" data-linenumber="1991" 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="LC1993" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- applications in coercions, so there's no point in looking there. On the</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1994" 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">
1994
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<td class="diff-line-num new_line old" data-linenumber="1991" 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="LC1994" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- other hand, we must check for type variables, lest we mutably create an</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1995" 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">
1995
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<td class="diff-line-num new_line old" data-linenumber="1991" 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="LC1995" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- infinite structure during unification.</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1996" 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">
1996
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<td class="diff-line-num new_line old" data-linenumber="1991" 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="LC1996" class="line" lang="haskell"></span>
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<td class="diff-line-num new old_line" data-linenumber="1997" 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">
</td>
<td class="diff-line-num new new_line" data-linenumber="1991" 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">
1991
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<pre style="margin: 0;">+<span id="LC1991" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- LHSs), and for (e) see Note [CEqCan occurs check] in GHC.Tc.Types.Constraint.</span></span>
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<td class="diff-line-num old_line" data-linenumber="1997" 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">
1997
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<td class="diff-line-num new_line" data-linenumber="1992" 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">
1992
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<pre style="margin: 0;"> <span id="LC1992" class="line" lang="haskell"><span class="n" style="color: #333;">checkTypeEq</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">ty_fam_ok</span> <span class="n" style="color: #333;">lhs</span> <span class="n" style="color: #333;">ty</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="1998" 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">
1998
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<td class="diff-line-num new_line" data-linenumber="1993" 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">
1993
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<pre style="margin: 0;"> <span id="LC1993" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty</span></span>
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<td class="diff-line-num old_line" data-linenumber="1999" 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">
1999
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<td class="diff-line-num new_line" data-linenumber="1994" 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">
1994
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<pre style="margin: 0;"> <span id="LC1994" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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