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<h3>
Ben Gamari pushed to branch ghc-9.0
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7e257575c99ae0d101e61175c5b8bd0756fb1e6f">7e257575</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-10-13T23:35:26+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Care with implicit-parameter superclasses
Two bugs, #18627 and #18649, had the same cause: we were not
account for the fact that a constaint tuple might hide an implicit
parameter.
The solution is not hard: look for implicit parameters in
superclasses. See Note [Local implicit parameters] in
GHC.Core.Predicate.
Then we use this new function in two places
* The "short-cut solver" in GHC.Tc.Solver.Interact.shortCutSolver
which simply didn't handle implicit parameters properly at all.
This fixes #18627
* The specialiser, which should not specialise on implicit parameters
This fixes #18649
There are some lingering worries (see Note [Local implicit
parameters]) but things are much better.
(cherry picked from commit c7182a5c67fe8b5bd256cb8eb805562636853ea2)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9060a9dd6fb7e0891d4ae448772931d9c02c0269">9060a9dd</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-13T23:36:56+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">sdist: Include hadrian sources in source distribution
Previously the make build system's source distribution rules neglected
to include Hadrian's sources.
Fixes #18794.
(cherry picked from commit 9657f6f34a1a00008a0db935dbf25733cb483cd4)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fb5eb8ab0834045dc2d8f84b8996bf08f1831cb4">fb5eb8ab</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-10-13T23:37:29+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix desugaring of record updates on data families
This fixes a long-standing bug in the desugaring of record
updates for data families, when the latter involves a GADT. It's
all explained in Note [Update for GADTs] in GHC.HsToCore.Expr.
Building the correct cast is surprisingly tricky, as that Note
explains.
Fixes #18809. The test case (in indexed-types/should_compile/T18809)
contains several examples that exercise the dark corners.
(cherry picked from commit bfdccac6acce84e15292a454d12f4e0d87ef6f10)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/64ab97bfdae8ca094d677ad27aecf514e7acafd0">64ab97bf</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-10-13T23:39:06+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add -pgmlm and -optlm flags
!3798 added documentation and semantics for the flags,
but not parsing.
(cherry picked from commit fd302e938ebf48c73d9f715d67ce8cd990f972ff)
</pre>
</li>
</ul>
<h4>26 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#783e5dae6e86931f06700fc088fb7d48c8a07386">
compiler/GHC/Core/Coercion.hs
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<li class="file-stats">
<a href="#6fcf64907fb5bdd93082d2d1eb94e4566e735865">
compiler/GHC/Core/DataCon.hs
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<li class="file-stats">
<a href="#ab22d7ae4d245581b701367e386d7e886e416e76">
compiler/GHC/Core/Opt/Specialise.hs
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<a href="#0ca1508e5b0cedec2f19fe10e414597184209573">
compiler/GHC/Core/Predicate.hs
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<li class="file-stats">
<a href="#8ee6f6851986ea96987a52f1dbf39228c85c6032">
compiler/GHC/Core/TyCo/Subst.hs
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<li class="file-stats">
<a href="#774d88050336ef660c7a219fb06c480c2fc639bc">
compiler/GHC/Driver/Session.hs
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<li class="file-stats">
<a href="#cc97d81e7223ad4a3a5e801156ca632f9fa75654">
compiler/GHC/Hs/Expr.hs
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<li class="file-stats">
<a href="#6bdd5abc649727f2a802bc96ce5c276de19d3726">
compiler/GHC/HsToCore/Expr.hs
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<a href="#aebe2c3d616f6843166d2657bed048898add6bc9">
compiler/GHC/Tc/Instance/Class.hs
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<a href="#e65390fa5a32c453a81a1c9a3e1c4464d155ca4a">
compiler/GHC/Tc/Module.hs
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<a href="#54436e21ea530a66a8a71bcc01c836f4740b8f02">
compiler/GHC/Tc/Solver.hs
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<a href="#f018e77421f495c6f75733fee4a511cfe57bebe8">
compiler/GHC/Tc/Solver/Canonical.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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<a href="#e63425e031ffe9350ee6b1687e506aaea75d11e1">
compiler/GHC/Tc/TyCl/Instance.hs
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<li class="file-stats">
<a href="#46e7b59eca287d43c19d0d8902b41f5d04f0d268">
compiler/GHC/Tc/Types/Evidence.hs
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<a href="#5461e7beeb7ae73d7c01f720cbaa3fa2c5333590">
compiler/GHC/Tc/Utils/TcType.hs
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<li class="file-stats">
<a href="#8bdb62b981f38737157a853655e494433eea6796">
ghc.mk
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<li class="file-stats">
<a href="#9ac3b381002bb0296436d38ebcf91cf6fc5ac9ea">
<span class="new-file">
+
testsuite/tests/indexed-types/should_compile/T18809.hs
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<li class="file-stats">
<a href="#58b9bc2ffb1c7d7b545e6aada524a5d53266e95e">
testsuite/tests/indexed-types/should_compile/all.T
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<li class="file-stats">
<a href="#db575e081e1764bd580624cab286af92c361e338">
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testsuite/tests/simplCore/should_compile/T18649.hs
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<li class="file-stats">
<a href="#fb99e471747eafcf334c714ee478740a4b9f4198">
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+
testsuite/tests/simplCore/should_compile/T18649.stderr
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<li class="file-stats">
<a href="#fc07c260b75644727a8cdc1af5c861a44d4bfb5e">
testsuite/tests/simplCore/should_compile/all.T
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<li class="file-stats">
<a href="#6f33783c8d13aee2994cdd57addf2f97a4f8b849">
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testsuite/tests/typecheck/should_run/T18627.hs
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<a href="#25acb6208a3348d849f692d01e26d759ac4e8979">
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+
testsuite/tests/typecheck/should_run/T18627.stdout
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<li class="file-stats">
<a href="#8db0e99055bd439c988ea726deb76570d8736a55">
testsuite/tests/typecheck/should_run/all.T
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</ul>
<h4>Changes:</h4>
<li id="783e5dae6e86931f06700fc088fb7d48c8a07386">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/d09e7e41cf79fe981a61eae46a93d8881859ff1f...64ab97bfdae8ca094d677ad27aecf514e7acafd0#783e5dae6e86931f06700fc088fb7d48c8a07386"><strong>compiler/GHC/Core/Coercion.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="41" 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">@@ -41,6 +41,7 @@ module GHC.Core.Coercion (</td>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">downgradeRole</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkAxiomRuleCo</span><span class="p">,</span></span>
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<td class="diff-line-num old_line" data-linenumber="42" 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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<td class="diff-line-num new_line" data-linenumber="42" 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="LC42" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkGReflRightCo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkGReflLeftCo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkCoherenceLeftCo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkCoherenceRightCo</span><span class="p">,</span></span>
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<td class="diff-line-num old_line" data-linenumber="43" 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="LC43" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkKindCo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">castCoercionKind</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">castCoercionKindI</span><span class="p">,</span></span>
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<td class="diff-line-num new old_line" data-linenumber="44" 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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<td class="diff-line-num new new_line" data-linenumber="44" 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="LC44" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkFamilyTyConAppCo</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkHeteroCoercionType</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkPrimEqPred</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkReprPrimEqPred</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkPrimEqPredRole</span><span class="p">,</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1505" 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="1506" 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">@@ -1505,6 +1506,27 @@ castCoercionKindI g h1 h2</td>
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<pre style="margin: 0;"> <span id="LC1506" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkCoherenceRightCo</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">t2</span> <span class="n" style="color: #333;">h2</span> <span class="p">(</span><span class="n" style="color: #333;">mkCoherenceLeftCo</span> <span class="n" style="color: #333;">r</span> <span class="n" style="color: #333;">t1</span> <span class="n" style="color: #333;">h1</span> <span class="n" style="color: #333;">g</span><span class="p">)</span></span>
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<td class="diff-line-num new_line" data-linenumber="1507" 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="LC1507" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Pair</span> <span class="n" style="color: #333;">t1</span> <span class="n" style="color: #333;">t2</span><span class="p">,</span> <span class="n" style="color: #333;">r</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">coercionKindRole</span> <span class="n" style="color: #333;">g</span></span>
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<pre style="margin: 0;"> <span id="LC1508" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1509" class="line" lang="haskell"><span class="n" style="color: #333;">mkFamilyTyConAppCo</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;">CoercionN</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoercionN</span></span>
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<pre style="margin: 0;">+<span id="LC1510" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ^ Given a family instance 'TyCon' and its arg 'Coercion's, return the</span></span>
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<pre style="margin: 0;">+<span id="LC1511" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- corresponding family 'Coercion'. E.g:</span></span>
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1512
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<pre style="margin: 0;">+<span id="LC1512" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1513
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<pre style="margin: 0;">+<span id="LC1513" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- > data family T a</span></span>
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1514
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<pre style="margin: 0;">+<span id="LC1514" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- > data instance T (Maybe b) = MkT b</span></span>
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1515
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<pre style="margin: 0;">+<span id="LC1515" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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1516
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<pre style="margin: 0;">+<span id="LC1516" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Where the instance 'TyCon' is :RTL, so:</span></span>
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1517
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<pre style="margin: 0;">+<span id="LC1517" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC1518" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- > mkFamilyTyConAppCo :RTL (co :: a ~# Int) = T (Maybe a) ~# T (Maybe Int)</span></span>
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1519
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<pre style="margin: 0;">+<span id="LC1519" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC1520" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- cf. 'mkFamilyTyConApp'</span></span>
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<pre style="margin: 0;">+<span id="LC1521" class="line" lang="haskell"><span class="n" style="color: #333;">mkFamilyTyConAppCo</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">cos</span></span>
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<pre style="margin: 0;">+<span id="LC1522" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">fam_tc</span><span class="p">,</span> <span class="n" style="color: #333;">fam_tys</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tyConFamInst_maybe</span> <span class="n" style="color: #333;">tc</span></span>
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<pre style="margin: 0;">+<span id="LC1523" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyConTyVars</span> <span class="n" style="color: #333;">tc</span></span>
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<pre style="margin: 0;">+<span id="LC1524" class="line" lang="haskell"> <span class="n" style="color: #333;">fam_cos</span> <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;">tvs</span> <span class="p">`</span><span class="n" style="color: #333;">equalLength</span><span class="p">`</span> <span class="n" style="color: #333;">cos</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tc</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cos</span> <span class="p">)</span></span>
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1525
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<pre style="margin: 0;">+<span id="LC1525" class="line" lang="haskell"> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">liftCoSubstWith</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">cos</span><span class="p">)</span> <span class="n" style="color: #333;">fam_tys</span></span>
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<pre style="margin: 0;">+<span id="LC1526" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyConAppCo</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">fam_cos</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1527" 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="LC1527" 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="LC1528" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyConAppCo</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">cos</span></span>
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<pre style="margin: 0;">+<span id="LC1529" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1530" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See note [Newtype coercions] in GHC.Core.TyCon</span></span>
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<pre style="margin: 0;"> <span id="LC1531" class="line" lang="haskell"></span>
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1532
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<pre style="margin: 0;"> <span id="LC1532" class="line" lang="haskell"><span class="n" style="color: #333;">mkPiCos</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Role</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Var</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/d09e7e41cf79fe981a61eae46a93d8881859ff1f...64ab97bfdae8ca094d677ad27aecf514e7acafd0#6fcf64907fb5bdd93082d2d1eb94e4566e735865"><strong>compiler/GHC/Core/DataCon.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">@@ -580,6 +580,7 @@ variables:</td>
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580
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580
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<pre style="margin: 0;"> <span id="LC580" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> purposes of TypeApplications, and as a consequence, they do not come equipped</span></span>
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581
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<pre style="margin: 0;"> <span id="LC581" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> with visibilities (that is, they are TyVars/TyCoVars instead of</span></span>
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<pre style="margin: 0;"> <span id="LC582" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> TyCoVarBinders).</span></span>
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<pre style="margin: 0;">+<span id="LC583" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC584" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* dcUserTyVarBinders, for the type variables binders in the order in which they</span></span>
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585
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<pre style="margin: 0;"> <span id="LC585" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> originally arose in the user-written type signature. Their order *does* matter</span></span>
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<pre style="margin: 0;"> <span id="LC586" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> for TypeApplications, so they are full TyVarBinders, complete with</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">@@ -600,10 +601,10 @@ dcExTyCoVars. That is, the tyvars in dcUserTyVarBinders are a permutation of</td>
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<pre style="margin: 0;"> <span id="LC601" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">ordering, they in fact share the same type variables (with the same Uniques). We</span></span>
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<pre style="margin: 0;"> <span id="LC602" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">sometimes refer to this as "the dcUserTyVarBinders invariant".</span></span>
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<pre style="margin: 0;"> <span id="LC603" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC603" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">dcUserTyVarBinders, as the name suggests, is the one that users will<span class="idiff left right"> see most of</span></span></span>
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604
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<pre style="margin: 0;">-<span id="LC604" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">the time. It's used when computing the type signature of a data constructor (see</span></span></span>
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605
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<pre style="margin: 0;">-<span id="LC605" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">data<span class="idiff left right">ConWrapperType), and as a result, it's what matters from a TypeApplications</span></span></span>
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<pre style="margin: 0;">-<span id="LC606" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">perspective.</span></span>
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<pre style="margin: 0;">+<span id="LC604" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">dcUserTyVarBinders, as the name suggests, is the one that users will</span></span>
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<pre style="margin: 0;">+<span id="LC605" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">see most of the time. It's used when computing the type signature of a</span></span></span>
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<pre style="margin: 0;">+<span id="LC606" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">data<span class="idiff left right"> constructor wrapper (see dataConWrapperType), and as a result,</span></span></span>
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<pre style="margin: 0;">+<span id="LC607" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">it's what matters from a TypeApplications </span>perspective.</span></span>
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<pre style="margin: 0;"> <span id="LC608" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC609" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [The dcEqSpec domain invariant]</span></span>
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<pre style="margin: 0;"> <span id="LC610" 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/d09e7e41cf79fe981a61eae46a93d8881859ff1f...64ab97bfdae8ca094d677ad27aecf514e7acafd0#ab22d7ae4d245581b701367e386d7e886e416e76"><strong>compiler/GHC/Core/Opt/Specialise.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">@@ -2508,9 +2508,12 @@ mkCallUDs' env f args</td>
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<pre style="margin: 0;"> <span id="LC2508" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we decide on a case by case basis if we want to specialise</span></span>
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<pre style="margin: 0;"> <span id="LC2509" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- on this argument; if so, SpecDict, if not UnspecArg</span></span>
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<pre style="margin: 0;"> <span id="LC2510" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_spec_arg</span> <span class="n" style="color: #333;">arg</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Anon</span> <span class="kt" style="color: #458; font-weight: 600;">InvisArg</span> <span class="n" style="color: #333;">pred</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC2511" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">type_determines_value</span> <span class="p">(</span><span class="n" style="color: #333;">scaledThing</span> <span class="n" style="color: #333;">pred</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC2512" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">interestingDict</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">arg</span> <span class="c1" style="color: #998; font-style: italic;">-- Note [Interesting dictionary arguments]</span></span>
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<pre style="margin: 0;">+<span id="LC2511" 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;">isIPLikePred</span> <span class="p">(</span><span class="n" style="color: #333;">scaledThing</span> <span class="n" style="color: #333;">pred</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC2512" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Type determines value]</span></span>
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<pre style="margin: 0;">+<span id="LC2513" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">interestingDict</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">arg</span></span>
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<pre style="margin: 0;">+<span id="LC2514" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Interesting dictionary arguments]</span></span>
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<pre style="margin: 0;"> <span id="LC2515" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SpecDict</span> <span class="n" style="color: #333;">arg</span></span>
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<pre style="margin: 0;">+<span id="LC2516" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2517" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">UnspecArg</span></span>
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<pre style="margin: 0;"> <span id="LC2518" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2519" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_spec_arg</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Anon</span> <span class="kt" style="color: #458; font-weight: 600;">VisArg</span> <span class="kr" style="font-weight: 600;">_</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">@@ -2523,41 +2526,18 @@ mkCallUDs' env f args</td>
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<pre style="margin: 0;"> <span id="LC2526" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in specImports</span></span>
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<pre style="margin: 0;"> <span id="LC2527" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Use 'realIdUnfolding' to ignore the loop-breaker flag!</span></span>
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<pre style="margin: 0;"> <span id="LC2528" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2526" class="line" lang="haskell"> <span class="n" style="color: #333;">type_determines_value</span> <span class="n" style="color: #333;">pred</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Type determines value]</span></span>
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<pre style="margin: 0;">-<span id="LC2527" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">classifyPredType</span> <span class="n" style="color: #333;">pred</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC2528" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ClassPred</span> <span class="n" style="color: #333;">cls</span> <span class="kr" style="font-weight: 600;">_</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;">isIPClass</span> <span class="n" style="color: #333;">cls</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Superclasses can't be IPs</span></span>
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<pre style="margin: 0;">-<span id="LC2529" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">EqPred</span> <span class="p">{}</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="LC2530" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">IrredPred</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="c1" style="color: #998; font-style: italic;">-- Things like (D []) where D is a</span></span>
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<pre style="margin: 0;">-<span id="LC2531" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Constraint-ranged family; #7785</span></span>
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<pre style="margin: 0;">-<span id="LC2532" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ForAllPred</span> <span class="p">{}</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="LC2533" class="line" lang="haskell"></span>
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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></span>
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<pre style="margin: 0;">-<span id="LC2535" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Type determines value]</span></span>
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<pre style="margin: 0;">-<span id="LC2536" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC2537" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Only specialise on non-IP *class* params, because these are the ones</span></span>
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<pre style="margin: 0;">-<span id="LC2538" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">whose *type* determines their *value*. In particular, with implicit</span></span>
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<pre style="margin: 0;">-<span id="LC2539" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">params, the type args *don't* say what the value of the implicit param</span></span>
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<pre style="margin: 0;">-<span id="LC2540" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is! See #7101.</span></span>
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<pre style="margin: 0;">+<span id="LC2529" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Type determines value]</span></span>
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<pre style="margin: 0;">+<span id="LC2530" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</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;">Only specialise on non-impicit-parameter predicates, because these</span></span>
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<pre style="margin: 0;">+<span id="LC2532" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">are the ones whose *type* determines their *value*. In particular,</span></span>
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<pre style="margin: 0;">+<span id="LC2533" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with implicit params, the type args *don't* say what the value of the</span></span>
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<pre style="margin: 0;">+<span id="LC2534" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">implicit param is! See #7101.</span></span>
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<pre style="margin: 0;"> <span id="LC2535" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2536" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So we treat implicit params just like ordinary arguments for the</span></span>
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<pre style="margin: 0;"> <span id="LC2537" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">purposes of specialisation. Note that we still want to specialise</span></span>
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<pre style="margin: 0;"> <span id="LC2538" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">functions with implicit params if they have *other* dicts which are</span></span>
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<pre style="margin: 0;"> <span id="LC2539" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">class params; see #17930.</span></span>
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<pre style="margin: 0;"> <span id="LC2540" class="line" lang="haskell"></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;">One apparent additional complexity involves type families. For</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;">example, consider</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;"> type family D (v::*->*) :: Constraint</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;"> type instance D [] = ()</span></span>
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<pre style="margin: 0;">-<span id="LC2551" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: D v => v Char -> Int</span></span>
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<pre style="margin: 0;">-<span id="LC2552" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If we see a call (f "foo"), we'll pass a "dictionary"</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;"> () |> (g :: () ~ D [])</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;">and it's good to specialise f at this dictionary.</span></span>
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<pre style="margin: 0;">-<span id="LC2555" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2556" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So the question is: can an implicit parameter "hide inside" a</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;">type-family constraint like (D a). Well, no. We don't allow</span></span>
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<pre style="margin: 0;">-<span id="LC2558" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type instance D Maybe = ?x:Int</span></span>
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<pre style="margin: 0;">-<span id="LC2559" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Hence the IrredPred case in type_determines_value. See #7785.</span></span>
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<pre style="margin: 0;">-<span id="LC2560" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2541" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Interesting dictionary arguments]</span></span>
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<pre style="margin: 0;"> <span id="LC2542" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;"> <span id="LC2543" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider this</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/d09e7e41cf79fe981a61eae46a93d8881859ff1f...64ab97bfdae8ca094d677ad27aecf514e7acafd0#0ca1508e5b0cedec2f19fe10e414597184209573"><strong>compiler/GHC/Core/Predicate.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">@@ -20,9 +20,10 @@ module GHC.Core.Predicate (</td>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkClassPred</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isDictTy</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isClassPred</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isEqPredClass</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isCTupleClass</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">getClassPredTys</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">getClassPredTys_maybe</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">classMethodTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">classMethodInstTy</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Implicit parameters</span></span>
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<pre style="margin: 0;">-<span id="LC25" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isIP<span class="idiff left">Pred</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">isIPPred_maybe</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">isIPTyCon</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">isIPClass</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">hasIPPred</span></span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isIP<span class="idiff left">LikePred</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">hasIPSuperClasses</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">isIPTyCon</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">isIPClass</span></span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Evidence variables</span></span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DictId</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isEvVar</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isDictId</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">@@ -38,12 +39,10 @@ import GHC.Core.Coercion</td>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Builtin.Names</span></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC41" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.FastString</span></span>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Outputable</span></span>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Misc</span></span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Multiplicity</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">scaledThing</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC46" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Monad</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">guard</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="haskell"><span class="cd">-- | A predicate in the solver. The solver tries to prove Wanted predicates</span></span>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- from Given ones.</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">@@ -94,6 +93,26 @@ getClassPredTys_maybe ty = case splitTyConApp_maybe ty of</td>
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94
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<pre style="margin: 0;"> <span id="LC93" 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;">tc</span><span class="p">,</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span> <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;">clas</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tyConClass_maybe</span> <span class="n" style="color: #333;">tc</span> <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;">clas</span><span class="p">,</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC94" class="line" lang="haskell"> <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;">Nothing</span></span>
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<pre style="margin: 0;"> <span id="LC95" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC96" class="line" lang="haskell"><span class="n" style="color: #333;">classMethodTy</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span></span>
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<pre style="margin: 0;">+<span id="LC97" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Takes a class selector op :: forall a. C a => meth_ty</span></span>
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<pre style="margin: 0;">+<span id="LC98" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- and returns the type of its method, meth_ty</span></span>
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99
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<pre style="margin: 0;">+<span id="LC99" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The selector can be a superclass selector, in which case</span></span>
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100
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<pre style="margin: 0;">+<span id="LC100" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- you get back a superclass</span></span>
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101
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<pre style="margin: 0;">+<span id="LC101" class="line" lang="haskell"><span class="n" style="color: #333;">classMethodTy</span> <span class="n" style="color: #333;">sel_id</span></span>
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102
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<pre style="margin: 0;">+<span id="LC102" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">funResultTy</span> <span class="o" style="font-weight: 600;">$</span> <span class="c1" style="color: #998; font-style: italic;">-- meth_ty</span></span>
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<pre style="margin: 0;">+<span id="LC103" class="line" lang="haskell"> <span class="n" style="color: #333;">dropForAlls</span> <span class="o" style="font-weight: 600;">$</span> <span class="c1" style="color: #998; font-style: italic;">-- C a => meth_ty</span></span>
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<pre style="margin: 0;">+<span id="LC104" class="line" lang="haskell"> <span class="n" style="color: #333;">varType</span> <span class="n" style="color: #333;">sel_id</span> <span class="c1" style="color: #998; font-style: italic;">-- forall a. C n => meth_ty</span></span>
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<pre style="margin: 0;">+<span id="LC105" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC106" class="line" lang="haskell"><span class="n" style="color: #333;">classMethodInstTy</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span></span>
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<pre style="margin: 0;">+<span id="LC107" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Takes a class selector op :: forall a b. C a b => meth_ty</span></span>
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<pre style="margin: 0;">+<span id="LC108" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- and the types [ty1, ty2] at which it is instantiated,</span></span>
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<pre style="margin: 0;">+<span id="LC109" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- returns the instantiated type of its method, meth_ty[t1/a,t2/b]</span></span>
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<pre style="margin: 0;">+<span id="LC110" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The selector can be a superclass selector, in which case</span></span>
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<pre style="margin: 0;">+<span id="LC111" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- you get back a superclass</span></span>
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<pre style="margin: 0;">+<span id="LC112" class="line" lang="haskell"><span class="n" style="color: #333;">classMethodInstTy</span> <span class="n" style="color: #333;">sel_id</span> <span class="n" style="color: #333;">arg_tys</span></span>
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<pre style="margin: 0;">+<span id="LC113" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">funResultTy</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC114" class="line" lang="haskell"> <span class="n" style="color: #333;">piResultTys</span> <span class="p">(</span><span class="n" style="color: #333;">varType</span> <span class="n" style="color: #333;">sel_id</span><span class="p">)</span> <span class="n" style="color: #333;">arg_tys</span></span>
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115
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<pre style="margin: 0;">+<span id="LC115" class="line" lang="haskell"></span>
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97
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<pre style="margin: 0;"> <span id="LC116" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- --------------------- Equality predicates ---------------------------------</span></span>
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98
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117
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<pre style="margin: 0;"> <span id="LC117" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC118" class="line" lang="haskell"><span class="cd">-- | A choice of equality relation. This is separate from the type 'Role'</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">@@ -169,7 +188,7 @@ isEqPredClass :: Class -> Bool</td>
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<pre style="margin: 0;"> <span id="LC188" class="line" lang="haskell"><span class="n" style="color: #333;">isEqPredClass</span> <span class="n" style="color: #333;">cls</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cls</span> <span class="p">`</span><span class="n" style="color: #333;">hasKey</span><span class="p">`</span> <span class="n" style="color: #333;">eqTyConKey</span></span>
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<pre style="margin: 0;"> <span id="LC189" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">cls</span> <span class="p">`</span><span class="n" style="color: #333;">hasKey</span><span class="p">`</span> <span class="n" style="color: #333;">heqTyConKey</span></span>
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190
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<pre style="margin: 0;"> <span id="LC190" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC172" class="line" lang="haskell"><span class="n" style="color: #333;">isClassPred</span><span class="p">,</span> <span class="n" style="color: #333;">isEqPred</span><span class="p">,</span> <span class="n" style="color: #333;">isEqPrimPred</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">isIPPred</span></span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PredType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC191" class="line" lang="haskell"><span class="n" style="color: #333;">isClassPred</span><span class="p">,</span> <span class="n" style="color: #333;">isEqPred</span><span class="p">,</span> <span class="n" style="color: #333;">isEqPrimPred</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PredType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;"> <span id="LC192" class="line" lang="haskell"><span class="n" style="color: #333;">isClassPred</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">tyConAppTyCon_maybe</span> <span class="n" style="color: #333;">ty</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC193" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">tyCon</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isClassTyCon</span> <span class="n" style="color: #333;">tyCon</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="LC194" class="line" lang="haskell"> <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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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -185,9 +204,15 @@ isEqPred ty -- True of (a ~ b) and (a ~~ b)</td>
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<pre style="margin: 0;"> <span id="LC204" class="line" lang="haskell"><span class="n" style="color: #333;">isEqPrimPred</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isCoVarType</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC205" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- True of (a ~# b) (a ~R# b)</span></span>
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<pre style="margin: 0;"> <span id="LC206" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC188" class="line" lang="haskell"><span class="n" style="color: #333;">isIPPred</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">tyConAppTyCon_maybe</span> <span class="n" style="color: #333;">ty</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC189" class="line" lang="haskell"> <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;">isIPTyCon</span> <span class="n" style="color: #333;">tc</span></span>
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<pre style="margin: 0;">-<span id="LC190" class="line" lang="haskell"> <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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<pre style="margin: 0;">+<span id="LC207" class="line" lang="haskell"><span class="n" style="color: #333;">isCTupleClass</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Class</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC208" class="line" lang="haskell"><span class="n" style="color: #333;">isCTupleClass</span> <span class="n" style="color: #333;">cls</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isTupleTyCon</span> <span class="p">(</span><span class="n" style="color: #333;">classTyCon</span> <span class="n" style="color: #333;">cls</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC209" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC210" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC211" 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="LC212" 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="LC213" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Implicit parameters</span></span>
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<pre style="margin: 0;">+<span id="LC214" 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="LC215" 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="LC216" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC217" class="line" lang="haskell"><span class="n" style="color: #333;">isIPTyCon</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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193
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<pre style="margin: 0;"> <span id="LC218" class="line" lang="haskell"><span class="n" style="color: #333;">isIPTyCon</span> <span class="n" style="color: #333;">tc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tc</span> <span class="p">`</span><span class="n" style="color: #333;">hasKey</span><span class="p">`</span> <span class="n" style="color: #333;">ipClassKey</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">@@ -196,31 +221,103 @@ isIPTyCon tc = tc `hasKey` ipClassKey</td>
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<pre style="margin: 0;"> <span id="LC221" class="line" lang="haskell"><span class="n" style="color: #333;">isIPClass</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Class</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;"> <span id="LC222" class="line" lang="haskell"><span class="n" style="color: #333;">isIPClass</span> <span class="n" style="color: #333;">cls</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cls</span> <span class="p">`</span><span class="n" style="color: #333;">hasKey</span><span class="p">`</span> <span class="n" style="color: #333;">ipClassKey</span></span>
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<pre style="margin: 0;"> <span id="LC223" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC199" class="line" lang="haskell"><span class="n" style="color: #333;">isCTupleClass</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Class</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">-<span id="LC200" class="line" lang="haskell"><span class="n" style="color: #333;">isCTupleClass</span> <span class="n" style="color: #333;">cls</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isTupleTyCon</span> <span class="p">(</span><span class="n" style="color: #333;">classTyCon</span> <span class="n" style="color: #333;">cls</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC224" class="line" lang="haskell"><span class="n" style="color: #333;">isIPLikePred</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC225" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Local implicit parameters]</span></span>
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<pre style="margin: 0;">+<span id="LC226" class="line" lang="haskell"><span class="n" style="color: #333;">isIPLikePred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">is_ip_like_pred</span> <span class="n" style="color: #333;">initIPRecTc</span></span>
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<pre style="margin: 0;"> <span id="LC227" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC202" class="line" lang="haskell"><span class="n" style="color: #333;">isIPPred_maybe</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FastString</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="LC203" class="line" lang="haskell"><span class="n" style="color: #333;">isIPPred_maybe</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">-<span id="LC204" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">(</span><span class="n" style="color: #333;">tc</span><span class="p">,[</span><span class="n" style="color: #333;">t1</span><span class="p">,</span><span class="n" style="color: #333;">t2</span><span class="p">])</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitTyConApp_maybe</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">-<span id="LC205" class="line" lang="haskell"> <span class="n" style="color: #333;">guard</span> <span class="p">(</span><span class="n" style="color: #333;">isIPTyCon</span> <span class="n" style="color: #333;">tc</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC206" class="line" lang="haskell"> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">isStrLitTy</span> <span class="n" style="color: #333;">t1</span></span>
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<pre style="margin: 0;">-<span id="LC207" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="p">,</span><span class="n" style="color: #333;">t2</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC208" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC209" class="line" lang="haskell"><span class="n" style="color: #333;">hasIPPred</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PredType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">-<span id="LC210" class="line" lang="haskell"><span class="n" style="color: #333;">hasIPPred</span> <span class="n" style="color: #333;">pred</span></span>
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<pre style="margin: 0;">-<span id="LC211" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">classifyPredType</span> <span class="n" style="color: #333;">pred</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC212" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ClassPred</span> <span class="n" style="color: #333;">cls</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;">-<span id="LC213" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isIPClass</span> <span class="n" style="color: #333;">cls</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="LC214" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isCTupleClass</span> <span class="n" style="color: #333;">cls</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">any</span> <span class="n" style="color: #333;">hasIPPred</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;">-<span id="LC215" class="line" lang="haskell"> <span class="n" style="color: #333;">_other</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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228
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<pre style="margin: 0;"> <span id="LC228" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC217" 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="LC218" 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="LC229" class="line" lang="haskell"><span class="n" style="color: #333;">is_ip_like_pred</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">RecTcChecker</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC230" class="line" lang="haskell"><span class="n" style="color: #333;">is_ip_like_pred</span> <span class="n" style="color: #333;">rec_clss</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC231" 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;">tc</span><span class="p">,</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitTyConApp_maybe</span> <span class="n" style="color: #333;">ty</span></span>
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232
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<pre style="margin: 0;">+<span id="LC232" 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;">rec_clss'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">isTupleTyCon</span> <span class="n" style="color: #333;">tc</span> <span class="c1" style="color: #998; font-style: italic;">-- Tuples never cause recursion</span></span>
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<pre style="margin: 0;">+<span id="LC233" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">rec_clss</span></span>
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234
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<pre style="margin: 0;">+<span id="LC234" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">checkRecTc</span> <span class="n" style="color: #333;">rec_clss</span> <span class="n" style="color: #333;">tc</span></span>
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235
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<pre style="margin: 0;">+<span id="LC235" 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;">cls</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tyConClass_maybe</span> <span class="n" style="color: #333;">tc</span></span>
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<pre style="margin: 0;">+<span id="LC236" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isIPClass</span> <span class="n" style="color: #333;">cls</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">has_ip_super_classes</span> <span class="n" style="color: #333;">rec_clss'</span> <span class="n" style="color: #333;">cls</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;">+<span id="LC237" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC238" 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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239
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<pre style="margin: 0;">+<span id="LC239" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="c1" style="color: #998; font-style: italic;">-- Includes things like (D []) where D is</span></span>
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<pre style="margin: 0;">+<span id="LC240" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- a Constraint-ranged family; #7785</span></span>
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241
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<pre style="margin: 0;">+<span id="LC241" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC242" class="line" lang="haskell"><span class="n" style="color: #333;">hasIPSuperClasses</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Class</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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243
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<pre style="margin: 0;">+<span id="LC243" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Local implicit parameters]</span></span>
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<pre style="margin: 0;">+<span id="LC244" class="line" lang="haskell"><span class="n" style="color: #333;">hasIPSuperClasses</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">has_ip_super_classes</span> <span class="n" style="color: #333;">initIPRecTc</span></span>
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245
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<pre style="margin: 0;">+<span id="LC245" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC246" class="line" lang="haskell"><span class="n" style="color: #333;">has_ip_super_classes</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">RecTcChecker</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Class</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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247
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<pre style="margin: 0;">+<span id="LC247" class="line" lang="haskell"><span class="n" style="color: #333;">has_ip_super_classes</span> <span class="n" style="color: #333;">rec_clss</span> <span class="n" style="color: #333;">cls</span> <span class="n" style="color: #333;">tys</span></span>
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248
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<pre style="margin: 0;">+<span id="LC248" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">any</span> <span class="n" style="color: #333;">ip_ish</span> <span class="p">(</span><span class="n" style="color: #333;">classSCSelIds</span> <span class="n" style="color: #333;">cls</span><span class="p">)</span></span>
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249
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<pre style="margin: 0;">+<span id="LC249" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC250" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Check that the type of a superclass determines its value</span></span>
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<pre style="margin: 0;">+<span id="LC251" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- sc_sel_id :: forall a b. C a b -> <superclass type></span></span>
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<pre style="margin: 0;">+<span id="LC252" class="line" lang="haskell"> <span class="n" style="color: #333;">ip_ish</span> <span class="n" style="color: #333;">sc_sel_id</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">is_ip_like_pred</span> <span class="n" style="color: #333;">rec_clss</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC253" class="line" lang="haskell"> <span class="n" style="color: #333;">classMethodInstTy</span> <span class="n" style="color: #333;">sc_sel_id</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;">+<span id="LC254" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC255" class="line" lang="haskell"><span class="n" style="color: #333;">initIPRecTc</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">RecTcChecker</span></span>
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<pre style="margin: 0;">+<span id="LC256" class="line" lang="haskell"><span class="n" style="color: #333;">initIPRecTc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setRecTcMaxBound</span> <span class="mi" style="color: #099;">1</span> <span class="n" style="color: #333;">initRecTc</span></span>
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<pre style="margin: 0;">+<span id="LC257" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC258" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Local implicit parameters]</span></span>
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259
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<pre style="margin: 0;">+<span id="LC259" 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="LC260" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The function isIPLikePred tells if this predicate, or any of its</span></span>
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261
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<pre style="margin: 0;">+<span id="LC261" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">superclasses, is an implicit parameter.</span></span>
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262
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<pre style="margin: 0;">+<span id="LC262" class="line" lang="haskell"></span>
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263
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<pre style="margin: 0;">+<span id="LC263" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Why are implicit parameters special? Unlike normal classes, we can</span></span>
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264
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<pre style="margin: 0;">+<span id="LC264" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">have local instances for implicit parameters, in the form of</span></span>
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265
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<pre style="margin: 0;">+<span id="LC265" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> let ?x = True in ...</span></span>
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266
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<pre style="margin: 0;">+<span id="LC266" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So in various places we must be careful not to assume that any value</span></span>
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267
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<pre style="margin: 0;">+<span id="LC267" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of the right type will do; we must carefully look for the innermost binding.</span></span>
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268
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<pre style="margin: 0;">+<span id="LC268" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So isIPLikePred checks whether this is an implicit parameter, or has</span></span>
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269
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<pre style="margin: 0;">+<span id="LC269" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">a superclass that is an implicit parameter.</span></span>
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270
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<pre style="margin: 0;">+<span id="LC270" class="line" lang="haskell"></span>
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271
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<pre style="margin: 0;">+<span id="LC271" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Several wrinkles</span></span>
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272
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<pre style="margin: 0;">+<span id="LC272" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC273" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* We must be careful with superclasses, as #18649 showed. Haskell</span></span>
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274
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<pre style="margin: 0;">+<span id="LC274" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> doesn't allow an implicit parameter as a superclass</span></span>
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<pre style="margin: 0;">+<span id="LC275" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> class (?x::a) => C a where ...</span></span>
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276
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<pre style="margin: 0;">+<span id="LC276" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> but with a constraint tuple we might have</span></span>
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277
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<pre style="margin: 0;">+<span id="LC277" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (% Eq a, ?x::Int %)</span></span>
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278
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<pre style="margin: 0;">+<span id="LC278" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> and /its/ superclasses, namely (Eq a) and (?x::Int), /do/ include an</span></span>
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279
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<pre style="margin: 0;">+<span id="LC279" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> implicit parameter.</span></span>
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280
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<pre style="margin: 0;">+<span id="LC280" class="line" lang="haskell"></span>
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281
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<pre style="margin: 0;">+<span id="LC281" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> With ConstraintKinds this can apply to /any/ class, e.g.</span></span>
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282
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<pre style="margin: 0;">+<span id="LC282" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> class sc => C sc where ...</span></span>
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283
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<pre style="margin: 0;">+<span id="LC283" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Then (C (?x::Int)) has (?x::Int) as a superclass. So we must</span></span>
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284
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<pre style="margin: 0;">+<span id="LC284" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instantiate and check each superclass, one by one, in</span></span>
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<pre style="margin: 0;">+<span id="LC285" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> hasIPSuperClasses.</span></span>
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<pre style="margin: 0;">+<span id="LC286" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC287" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* With -XRecursiveSuperClasses, the superclass hunt can go on forever,</span></span>
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288
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<pre style="margin: 0;">+<span id="LC288" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> so we need a RecTcChecker to cut it off.</span></span>
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<pre style="margin: 0;">+<span id="LC289" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC290" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Another apparent additional complexity involves type families. For</span></span>
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291
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<pre style="margin: 0;">+<span id="LC291" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> example, consider</span></span>
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<pre style="margin: 0;">+<span id="LC292" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type family D (v::*->*) :: Constraint</span></span>
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<pre style="margin: 0;">+<span id="LC293" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type instance D [] = ()</span></span>
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<pre style="margin: 0;">+<span id="LC294" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: D v => v Char -> Int</span></span>
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<pre style="margin: 0;">+<span id="LC295" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> If we see a call (f "foo"), we'll pass a "dictionary"</span></span>
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<pre style="margin: 0;">+<span id="LC296" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> () |> (g :: () ~ D [])</span></span>
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297
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<pre style="margin: 0;">+<span id="LC297" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> and it's good to specialise f at this dictionary.</span></span>
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<pre style="margin: 0;">+<span id="LC298" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC299" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So the question is: can an implicit parameter "hide inside" a</span></span>
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<pre style="margin: 0;">+<span id="LC300" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">type-family constraint like (D a). Well, no. We don't allow</span></span>
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<pre style="margin: 0;">+<span id="LC301" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type instance D Maybe = ?x:Int</span></span>
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<pre style="margin: 0;">+<span id="LC302" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Hence the umbrella 'otherwise' case in is_ip_like_pred. See #7785.</span></span>
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<pre style="margin: 0;">+<span id="LC303" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC304" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Small worries (Sept 20):</span></span>
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<pre style="margin: 0;">+<span id="LC305" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* I don't see what stops us having that 'type instance'. Indeed I</span></span>
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306
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<pre style="margin: 0;">+<span id="LC306" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> think nothing does.</span></span>
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<pre style="margin: 0;">+<span id="LC307" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* I'm a little concerned about type variables; such a variable might</span></span>
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<pre style="margin: 0;">+<span id="LC308" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> be instantiated to an implicit parameter. I don't think this</span></span>
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309
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<pre style="margin: 0;">+<span id="LC309" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> matters in the cases for which isIPLikePred is used, and it's pretty</span></span>
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<pre style="margin: 0;">+<span id="LC310" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> obscure anyway.</span></span>
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311
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<pre style="margin: 0;">+<span id="LC311" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* The superclass hunt stops when it encounters the same class again,</span></span>
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<pre style="margin: 0;">+<span id="LC312" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> but in principle we could have the same class, differently instantiated,</span></span>
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<pre style="margin: 0;">+<span id="LC313" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> and the second time it could have an implicit parameter</span></span>
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<pre style="margin: 0;">+<span id="LC314" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">I'm going to treat these as problems for another day. They are all exotic. -}</span></span>
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315
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<pre style="margin: 0;">+<span id="LC315" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC316" 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="LC317" 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="LC318" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Evidence variables</span></span>
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<pre style="margin: 0;"> <span id="LC319" 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="LC222" 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="LC223" 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="LC320" 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="LC321" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC322" class="line" lang="haskell"><span class="n" style="color: #333;">isEvVar</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Var</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;"> <span id="LC323" class="line" lang="haskell"><span class="n" style="color: #333;">isEvVar</span> <span class="n" style="color: #333;">var</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isEvVarType</span> <span class="p">(</span><span class="n" style="color: #333;">varType</span> <span class="n" style="color: #333;">var</span><span class="p">)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/d09e7e41cf79fe981a61eae46a93d8881859ff1f...64ab97bfdae8ca094d677ad27aecf514e7acafd0#8ee6f6851986ea96987a52f1dbf39228c85c6032"><strong>compiler/GHC/Core/TyCo/Subst.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">@@ -435,8 +435,8 @@ mkTvSubstPrs prs =</td>
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<pre style="margin: 0;"> <span id="LC435" class="line" lang="haskell"><span class="n" style="color: #333;">zipTyEnv</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HasDebugCallStack</span> <span class="o" style="font-weight: 600;">=></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TvSubstEnv</span></span>
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<pre style="margin: 0;"> <span id="LC436" class="line" lang="haskell"><span class="n" style="color: #333;">zipTyEnv</span> <span class="n" style="color: #333;">tyvars</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;"> <span id="LC437" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">debugIsOn</span></span>
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<pre style="margin: 0;">-<span id="LC438" 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;">all</span> <span class="n" style="color: #333;">isTyVar</span> <span class="n" style="color: #333;">tyvars</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC439" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"zipTyEnv"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tyvars</span> <span class="o" style="font-weight: 600;"><span class="idiff left right"><+></span></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC438" 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;">all</span> <span class="n" style="color: #333;">isTyVar</span> <span class="n" style="color: #333;">tyvars</span><span class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff">&&</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">tyvars</span></span><span class="idiff"> </span><span class="p"><span class="idiff">`</span></span><span class="n" style="color: #333;"><span class="idiff">equalLength</span></span><span class="p"><span class="idiff">`</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tys</span></span><span class="p"><span class="idiff right">)</span>)</span></span>
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<pre style="margin: 0;">+<span id="LC439" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"zipTyEnv"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tyvars</span> <span class="o" style="font-weight: 600;"><span class="idiff left right">$$</span></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span></span>
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440
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440
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<pre style="margin: 0;"> <span id="LC440" 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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441
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<pre style="margin: 0;"> <span id="LC441" class="line" lang="haskell"> <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;">all</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">isCoercionTy</span><span class="p">)</span> <span class="n" style="color: #333;">tys</span> <span class="p">)</span></span>
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442
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442
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<pre style="margin: 0;"> <span id="LC442" class="line" lang="haskell"> <span class="n" style="color: #333;">mkVarEnv</span> <span class="p">(</span><span class="n" style="color: #333;">zipEqual</span> <span class="s" style="color: #d14;">"zipTyEnv"</span> <span class="n" style="color: #333;">tyvars</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/d09e7e41cf79fe981a61eae46a93d8881859ff1f...64ab97bfdae8ca094d677ad27aecf514e7acafd0#774d88050336ef660c7a219fb06c480c2fc639bc"><strong>compiler/GHC/Driver/Session.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">@@ -2360,6 +2360,8 @@ dynamic_flags_deps = [</td>
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2360
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2360
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<pre style="margin: 0;"> <span id="LC2360" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">hasArg</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">alterToolSettings</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">s</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">s</span> <span class="p">{</span> <span class="n" style="color: #333;">toolSettings_pgm_lo</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">f</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span> <span class="p">}</span></span>
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2361
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2361
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<pre style="margin: 0;"> <span id="LC2361" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">make_ord_flag</span> <span class="n" style="color: #333;">defFlag</span> <span class="s" style="color: #d14;">"pgmlc"</span></span>
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2362
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2362
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<pre style="margin: 0;"> <span id="LC2362" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">hasArg</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">alterToolSettings</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">s</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">s</span> <span class="p">{</span> <span class="n" style="color: #333;">toolSettings_pgm_lc</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">f</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span> <span class="p">}</span></span>
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2363
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<pre style="margin: 0;">+<span id="LC2363" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">make_ord_flag</span> <span class="n" style="color: #333;">defFlag</span> <span class="s" style="color: #d14;">"pgmlm"</span></span>
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2364
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<pre style="margin: 0;">+<span id="LC2364" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">hasArg</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">alterToolSettings</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">s</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">s</span> <span class="p">{</span> <span class="n" style="color: #333;">toolSettings_pgm_lm</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">f</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span> <span class="p">}</span></span>
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2363
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2365
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<pre style="margin: 0;"> <span id="LC2365" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">make_ord_flag</span> <span class="n" style="color: #333;">defFlag</span> <span class="s" style="color: #d14;">"pgmi"</span></span>
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2364
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2366
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<pre style="margin: 0;"> <span id="LC2366" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">hasArg</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">alterToolSettings</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">s</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">s</span> <span class="p">{</span> <span class="n" style="color: #333;">toolSettings_pgm_i</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">f</span> <span class="p">}</span></span>
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2367
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<pre style="margin: 0;"> <span id="LC2367" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">make_ord_flag</span> <span class="n" style="color: #333;">defFlag</span> <span class="s" style="color: #d14;">"pgmL"</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">@@ -2396,6 +2398,8 @@ dynamic_flags_deps = [</td>
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2396
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2398
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<pre style="margin: 0;"> <span id="LC2398" class="line" lang="haskell"></span>
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2397
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2399
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<pre style="margin: 0;"> <span id="LC2399" class="line" lang="haskell"></span>
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2398
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2400
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<pre style="margin: 0;"> <span id="LC2400" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- need to appear before -optl/-opta to be parsed as LLVM flags.</span></span>
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2401
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<pre style="margin: 0;">+<span id="LC2401" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">make_ord_flag</span> <span class="n" style="color: #333;">defFlag</span> <span class="s" style="color: #d14;">"optlm"</span></span>
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<pre style="margin: 0;">+<span id="LC2402" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">hasArg</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">alterToolSettings</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">s</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">s</span> <span class="p">{</span> <span class="n" style="color: #333;">toolSettings_opt_lm</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">toolSettings_opt_lm</span> <span class="n" style="color: #333;">s</span> <span class="p">}</span></span>
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2403
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<pre style="margin: 0;"> <span id="LC2403" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">make_ord_flag</span> <span class="n" style="color: #333;">defFlag</span> <span class="s" style="color: #d14;">"optlo"</span></span>
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2400
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<pre style="margin: 0;"> <span id="LC2404" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">hasArg</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">alterToolSettings</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">s</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">s</span> <span class="p">{</span> <span class="n" style="color: #333;">toolSettings_opt_lo</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">toolSettings_opt_lo</span> <span class="n" style="color: #333;">s</span> <span class="p">}</span></span>
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2405
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<pre style="margin: 0;"> <span id="LC2405" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">make_ord_flag</span> <span class="n" style="color: #333;">defFlag</span> <span class="s" style="color: #d14;">"optlc"</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/d09e7e41cf79fe981a61eae46a93d8881859ff1f...64ab97bfdae8ca094d677ad27aecf514e7acafd0#cc97d81e7223ad4a3a5e801156ca632f9fa75654"><strong>compiler/GHC/Hs/Expr.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">@@ -574,8 +574,9 @@ data RecordUpdTc = RecordUpdTc</td>
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<pre style="margin: 0;"> <span id="LC574" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC575" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">rupd_in_tys</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- Argument types of *input* record type</span></span>
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576
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<pre style="margin: 0;"> <span id="LC576" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">rupd_out_tys</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- and *output* record type</span></span>
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577
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<pre style="margin: 0;">-<span id="LC577" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The original type can be reconstructed</span></span>
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<pre style="margin: 0;">-<span id="LC578" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- with conLikeResTy</span></span>
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<pre style="margin: 0;">+<span id="LC577" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- For a data family, these are the type args of the</span></span>
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<pre style="margin: 0;">+<span id="LC578" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- /representation/ type constructor</span></span>
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<pre style="margin: 0;">+<span id="LC579" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC580" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">rupd_wrap</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsWrapper</span> <span class="c1" style="color: #998; font-style: italic;">-- See note [Record Update HsWrapper]</span></span>
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<pre style="margin: 0;"> <span id="LC581" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC582" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/d09e7e41cf79fe981a61eae46a93d8881859ff1f...64ab97bfdae8ca094d677ad27aecf514e7acafd0#6bdd5abc649727f2a802bc96ce5c276de19d3726"><strong>compiler/GHC/HsToCore/Expr.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">@@ -46,6 +46,7 @@ import GHC.Tc.Types.Evidence</td>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Monad</span></span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Type</span></span>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Multiplicity</span></span>
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<pre style="margin: 0;">+<span id="LC49" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Coercion</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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49
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core</span></span>
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50
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Utils</span></span>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Make</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="55" 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">@@ -54,6 +55,7 @@ import GHC.Driver.Session</td>
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.CostCentre</span></span>
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Id</span></span>
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<pre style="margin: 0;"> <span id="LC57" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Id.Make</span></span>
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<pre style="margin: 0;">+<span id="LC58" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var.Env</span></span>
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<pre style="margin: 0;"> <span id="LC59" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Unit.Module</span></span>
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<pre style="margin: 0;"> <span id="LC60" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.ConLike</span></span>
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<pre style="margin: 0;"> <span id="LC61" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.DataCon</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">@@ -62,13 +64,11 @@ import GHC.Builtin.Types</td>
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<pre style="margin: 0;"> <span id="LC64" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Builtin.Names</span></span>
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<pre style="margin: 0;"> <span id="LC65" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Basic</span></span>
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<pre style="margin: 0;"> <span id="LC66" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.Maybe</span></span>
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<pre style="margin: 0;">-<span id="LC65" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var.Env</span></span>
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<pre style="margin: 0;"> <span id="LC67" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.SrcLoc</span></span>
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<pre style="margin: 0;"> <span id="LC68" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Misc</span></span>
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<pre style="margin: 0;"> <span id="LC69" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.Bag</span></span>
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<pre style="margin: 0;"> <span id="LC70" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Outputable</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">Outputable</span></span>
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<pre style="margin: 0;"> <span id="LC71" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.PatSyn</span></span>
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<pre style="margin: 0;">-<span id="LC71" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC72" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Monad</span></span>
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<pre style="margin: 0;"> <span id="LC73" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.List.NonEmpty</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">nonEmpty</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC74" 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">@@ -614,13 +614,70 @@ Note [Update for GADTs]</td>
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<pre style="margin: 0;"> <span id="LC614" 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="LC615" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider</span></span>
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<pre style="margin: 0;"> <span id="LC616" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T a b where</span></span>
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617
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<pre style="margin: 0;">-<span id="LC617" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> T1 :: { f1 :: a } -> T a Int</span></span>
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<pre style="margin: 0;">+<span id="LC617" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkT :: { foo :: a } -> T a Int</span></span>
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<pre style="margin: 0;">+<span id="LC618" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC619" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> upd :: T s t -> s -> T s t</span></span>
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<pre style="margin: 0;">+<span id="LC620" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> upd z y = z { foo = y}</span></span>
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<pre style="margin: 0;">+<span id="LC621" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC622" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We need to get this:</span></span>
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<pre style="margin: 0;">+<span id="LC623" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> $WMkT :: a -> T a Int</span></span>
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<pre style="margin: 0;">+<span id="LC624" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkT :: (b ~# Int) => a -> T a b</span></span>
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<pre style="margin: 0;">+<span id="LC625" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC626" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> upd = /\s t. \(z::T s t) (y::s) -></span></span>
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<pre style="margin: 0;">+<span id="LC627" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> case z of</span></span>
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<pre style="margin: 0;">+<span id="LC628" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkT (co :: t ~# Int) _ -> $WMkT @s y |> T (Refl s) (Sym co)</span></span>
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<pre style="margin: 0;"> <span id="LC629" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC619" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Then the wrapper function for T1 has type</span></span>
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<pre style="margin: 0;">-<span id="LC620" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> $WT1 :: a -> T a Int</span></span>
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<pre style="margin: 0;">-<span id="LC621" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But if x::T a b, then</span></span>
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<pre style="margin: 0;">-<span id="LC622" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> x { f1 = v } :: T a b (not T a Int!)</span></span>
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<pre style="margin: 0;">-<span id="LC623" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So we need to cast (T a Int) to (T a b). Sigh.</span></span>
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<pre style="margin: 0;">+<span id="LC630" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note the final cast</span></span>
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<pre style="margin: 0;">+<span id="LC631" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> T (Refl s) (Sym co) :: T s Int ~ T s t</span></span>
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<pre style="margin: 0;">+<span id="LC632" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">which uses co, bound by the GADT match. This is the wrap_co coercion</span></span>
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<pre style="margin: 0;">+<span id="LC633" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in wrapped_rhs. How do we produce it?</span></span>
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634
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<pre style="margin: 0;">+<span id="LC634" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC635" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Start with raw materials</span></span>
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636
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<pre style="margin: 0;">+<span id="LC636" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> tc, the tycon: T</span></span>
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<pre style="margin: 0;">+<span id="LC637" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> univ_tvs, the universally quantified tyvars of MkT: a,b</span></span>
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<pre style="margin: 0;">+<span id="LC638" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> NB: these are in 1-1 correspondence with the tyvars of tc</span></span>
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639
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<pre style="margin: 0;">+<span id="LC639" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC640" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Form univ_cos, a coercion for each of tc's args: (Refl s) (Sym co)</span></span>
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641
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<pre style="margin: 0;">+<span id="LC641" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We replaced</span></span>
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<pre style="margin: 0;">+<span id="LC642" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a by (Refl s) since 's' instantiates 'a'</span></span>
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<pre style="margin: 0;">+<span id="LC643" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> b by (Sym co) since 'b' is in the data-con's EqSpec</span></span>
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<pre style="margin: 0;">+<span id="LC644" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC645" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Then form the coercion T (Refl s) (Sym co)</span></span>
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<pre style="margin: 0;">+<span id="LC647" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">It gets more complicated when data families are involved (#18809).</span></span>
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648
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<pre style="margin: 0;">+<span id="LC648" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider</span></span>
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649
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<pre style="margin: 0;">+<span id="LC649" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data family F x</span></span>
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650
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<pre style="margin: 0;">+<span id="LC650" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data instance F (a,b) where</span></span>
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651
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<pre style="margin: 0;">+<span id="LC651" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkF :: { foo :: Int } -> F (Int,b)</span></span>
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652
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653
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<pre style="margin: 0;">+<span id="LC653" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> bar :: F (s,t) -> Int -> F (s,t)</span></span>
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<pre style="margin: 0;">+<span id="LC654" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> bar z y = z { foo = y}</span></span>
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655
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656
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<pre style="margin: 0;">+<span id="LC656" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We have</span></span>
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657
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<pre style="margin: 0;">+<span id="LC657" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data R:FPair a b where</span></span>
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658
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<pre style="margin: 0;">+<span id="LC658" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkF :: { foo :: Int } -> R:FPair Int b</span></span>
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659
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660
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<pre style="margin: 0;">+<span id="LC660" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> $WMkF :: Int -> F (Int,b)</span></span>
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<pre style="margin: 0;">+<span id="LC661" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkF :: forall a b. (a ~# Int) => Int -> R:FPair a b</span></span>
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662
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<pre style="margin: 0;">+<span id="LC662" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC663" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> bar :: F (s,t) -> Int -> F (s,t)</span></span>
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664
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<pre style="margin: 0;">+<span id="LC664" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> bar = /\s t. \(z::F (s,t)) \(y::Int) -></span></span>
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<pre style="margin: 0;">+<span id="LC665" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> case z |> co1 of</span></span>
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<pre style="margin: 0;">+<span id="LC666" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkF (co2::s ~# Int) _ -> $WMkF @t y |> co3</span></span>
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667
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<pre style="margin: 0;">+<span id="LC667" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC668" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(Side note: here (z |> co1) is built by typechecking the scrutinee, so</span></span>
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669
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<pre style="margin: 0;">+<span id="LC669" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we ignore it here. In general the scrutinee is an aribtrary expression.)</span></span>
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670
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<pre style="margin: 0;">+<span id="LC670" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC671" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The question is: what is co3, the cast for the RHS?</span></span>
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672
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<pre style="margin: 0;">+<span id="LC672" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> co3 :: F (Int,t) ~ F (s,t)</span></span>
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673
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<pre style="margin: 0;">+<span id="LC673" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Again, we can construct it using co2, bound by the GADT match.</span></span>
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674
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<pre style="margin: 0;">+<span id="LC674" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We do /exactly/ the same as the non-family case up to building</span></span>
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675
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<pre style="margin: 0;">+<span id="LC675" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">univ_cos. But that gives us</span></span>
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676
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<pre style="margin: 0;">+<span id="LC676" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> rep_tc: R:FPair</span></span>
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677
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<pre style="margin: 0;">+<span id="LC677" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> univ_cos: (Sym co2) (Refl t)</span></span>
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678
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<pre style="margin: 0;">+<span id="LC678" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But then we use mkTcFamilyTyConAppCo to "lift" this to the coercion</span></span>
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<pre style="margin: 0;">+<span id="LC679" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we want, namely</span></span>
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<pre style="margin: 0;">+<span id="LC680" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> F (Sym co2, Refl t) :: F (Int,t) ~ F (s,t)</span></span>
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681
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<pre style="margin: 0;"> <span id="LC681" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC682" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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683
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<pre style="margin: 0;"> <span id="LC683" 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">@@ -707,8 +764,7 @@ dsExpr expr@(RecordUpd { rupd_expr = record_expr, rupd_flds = fields</td>
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<pre style="margin: 0;"> <span id="LC764" class="line" lang="haskell"> <span class="n" style="color: #333;">dict_req_wrap</span> <span class="o" style="font-weight: 600;"><.></span></span>
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765
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<pre style="margin: 0;"> <span id="LC765" class="line" lang="haskell"> <span class="n" style="color: #333;">mkWpTyApps</span> <span class="p">[</span> <span class="n" style="color: #333;">lookupTyVar</span> <span class="n" style="color: #333;">out_subst</span> <span class="n" style="color: #333;">tv</span></span>
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766
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<pre style="margin: 0;"> <span id="LC766" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">orElse</span><span class="p">`</span> <span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">tv</span></span>
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710
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<pre style="margin: 0;">-<span id="LC710" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">user_tvs</span></span>
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<pre style="margin: 0;">-<span id="LC711" 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;">tv</span> <span class="p">`</span><span class="n" style="color: #333;">elemVarEnv</span><span class="p">`</span> <span class="n" style="color: #333;">wrap_subst</span><span class="p">)</span> <span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC767" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">user_tvs</span> <span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC768" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Be sure to use user_tvs (which may be ordered</span></span>
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<pre style="margin: 0;"> <span id="LC769" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- differently than `univ_tvs ++ ex_tvs) above.</span></span>
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<pre style="margin: 0;"> <span id="LC770" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [DataCon user type variable binders]</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">@@ -719,27 +775,30 @@ dsExpr expr@(RecordUpd { rupd_expr = record_expr, rupd_flds = fields</td>
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719
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775
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<pre style="margin: 0;"> <span id="LC775" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Update for GADTs]</span></span>
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<pre style="margin: 0;"> <span id="LC776" class="line" lang="haskell"> <span class="n" style="color: #333;">wrapped_rhs</span> <span class="o" style="font-weight: 600;">=</span></span>
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777
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<pre style="margin: 0;"> <span id="LC777" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">con</span> <span class="kr" style="font-weight: 600;">of</span></span>
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722
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<pre style="margin: 0;">-<span id="LC722" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">data_con</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">-<span id="LC723" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span></span>
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<pre style="margin: 0;">-<span id="LC724" class="line" lang="haskell"> <span class="n" style="color: #333;">wrap_co</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">-<span id="LC725" class="line" lang="haskell"> <span class="n" style="color: #333;">mkTcTyConAppCo</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span></span>
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<pre style="margin: 0;">-<span id="LC726" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">dataConTyCon</span> <span class="n" style="color: #333;">data_con</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC727" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">lookup</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">-<span id="LC728" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">tv</span><span class="p">,</span><span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">univ_tvs</span> <span class="p">`</span><span class="n" style="color: #333;">zip</span><span class="p">`</span> <span class="n" style="color: #333;">out_inst_tys</span> <span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC729" class="line" lang="haskell"> <span class="n" style="color: #333;">lookup</span> <span class="n" style="color: #333;">univ_tv</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span></span>
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730
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<pre style="margin: 0;">-<span id="LC730" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lookupVarEnv</span> <span class="n" style="color: #333;">wrap_subst</span> <span class="n" style="color: #333;">univ_tv</span> <span class="kr" style="font-weight: 600;">of</span></span>
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731
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<pre style="margin: 0;">-<span id="LC731" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">co'</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">co'</span></span>
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<pre style="margin: 0;">-<span id="LC732" 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="n" style="color: #333;">mkTcReflCo</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">-<span id="LC733" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">eq_spec</span></span>
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734
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<pre style="margin: 0;">-<span id="LC734" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">rhs</span></span>
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735
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<pre style="margin: 0;">-<span id="LC735" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">mkLHsWrap</span> <span class="p">(</span><span class="n" style="color: #333;">mkWpCastN</span> <span class="n" style="color: #333;">wrap_co</span><span class="p">)</span> <span class="n" style="color: #333;">rhs</span></span>
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778
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<pre style="margin: 0;">+<span id="LC778" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">RealDataCon</span> <span class="n" style="color: #333;">data_con</span></span>
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<pre style="margin: 0;">+<span id="LC779" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">eq_spec</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;">+<span id="LC780" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">mkLHsWrap</span> <span class="p">(</span><span class="n" style="color: #333;">mkWpCastN</span> <span class="n" style="color: #333;">wrap_co</span><span class="p">)</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;">+<span id="LC781" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This wrap is the punchline: Note [Update for GADTs]</span></span>
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<pre style="margin: 0;">+<span id="LC782" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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783
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<pre style="margin: 0;">+<span id="LC783" class="line" lang="haskell"> <span class="n" style="color: #333;">rep_tc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dataConTyCon</span> <span class="n" style="color: #333;">data_con</span></span>
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784
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<pre style="margin: 0;">+<span id="LC784" class="line" lang="haskell"> <span class="n" style="color: #333;">wrap_co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTcFamilyTyConAppCo</span> <span class="n" style="color: #333;">rep_tc</span> <span class="n" style="color: #333;">univ_cos</span></span>
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<pre style="margin: 0;">+<span id="LC785" class="line" lang="haskell"> <span class="n" style="color: #333;">univ_cos</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">zipWithEqual</span> <span class="s" style="color: #d14;">"dsExpr:upd"</span> <span class="n" style="color: #333;">mk_univ_co</span> <span class="n" style="color: #333;">univ_tvs</span> <span class="n" style="color: #333;">out_inst_tys</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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<pre style="margin: 0;">+<span id="LC787" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_univ_co</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyVar</span> <span class="c1" style="color: #998; font-style: italic;">-- Universal tyvar from the DataCon</span></span>
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<pre style="margin: 0;">+<span id="LC788" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="c1" style="color: #998; font-style: italic;">-- Corresponding instantiating type</span></span>
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<pre style="margin: 0;">+<span id="LC789" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span></span>
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<pre style="margin: 0;">+<span id="LC790" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_univ_co</span> <span class="n" style="color: #333;">univ_tv</span> <span class="n" style="color: #333;">inst_ty</span></span>
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791
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<pre style="margin: 0;">+<span id="LC791" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">lookupVarEnv</span> <span class="n" style="color: #333;">eq_spec_env</span> <span class="n" style="color: #333;">univ_tv</span> <span class="kr" style="font-weight: 600;">of</span></span>
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792
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<pre style="margin: 0;">+<span id="LC792" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">co</span></span>
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793
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<pre style="margin: 0;">+<span id="LC793" 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="n" style="color: #333;">mkTcNomReflCo</span> <span class="n" style="color: #333;">inst_ty</span></span>
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794
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<pre style="margin: 0;">+<span id="LC794" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC795" class="line" lang="haskell"> <span class="n" style="color: #333;">eq_spec_env</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">VarEnv</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span></span>
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796
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<pre style="margin: 0;">+<span id="LC796" class="line" lang="haskell"> <span class="n" style="color: #333;">eq_spec_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkVarEnv</span> <span class="p">[</span> <span class="p">(</span><span class="n" style="color: #333;">eqSpecTyVar</span> <span class="n" style="color: #333;">spec</span><span class="p">,</span> <span class="n" style="color: #333;">mkTcSymCo</span> <span class="p">(</span><span class="n" style="color: #333;">mkTcCoVarCo</span> <span class="n" style="color: #333;">eqs_var</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC797" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">spec</span><span class="p">,</span><span class="n" style="color: #333;">eqs_var</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zipEqual</span> <span class="s" style="color: #d14;">"dsExpr:upd2"</span> <span class="n" style="color: #333;">eq_spec</span> <span class="n" style="color: #333;">eqs_vars</span> <span class="p">]</span></span>
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798
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<pre style="margin: 0;">+<span id="LC798" class="line" lang="haskell"></span>
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799
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<pre style="margin: 0;"> <span id="LC799" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- eq_spec is always null for a PatSynCon</span></span>
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737
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800
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<pre style="margin: 0;"> <span id="LC800" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">PatSynCon</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">rhs</span></span>
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738
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801
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<pre style="margin: 0;"> <span id="LC801" class="line" lang="haskell"></span>
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739
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<pre style="margin: 0;">-<span id="LC739" class="line" lang="haskell"> <span class="n" style="color: #333;">wrap_subst</span> <span class="o" style="font-weight: 600;">=</span></span>
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740
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<pre style="margin: 0;">-<span id="LC740" class="line" lang="haskell"> <span class="n" style="color: #333;">mkVarEnv</span> <span class="p">[</span> <span class="p">(</span><span class="n" style="color: #333;">tv</span><span class="p">,</span> <span class="n" style="color: #333;">mkTcSymCo</span> <span class="p">(</span><span class="n" style="color: #333;">mkTcCoVarCo</span> <span class="n" style="color: #333;">eq_var</span><span class="p">))</span></span>
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741
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<pre style="margin: 0;">-<span id="LC741" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="n" style="color: #333;">spec</span><span class="p">,</span> <span class="n" style="color: #333;">eq_var</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">eq_spec</span> <span class="p">`</span><span class="n" style="color: #333;">zip</span><span class="p">`</span> <span class="n" style="color: #333;">eqs_vars</span></span>
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<pre style="margin: 0;">-<span id="LC742" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eqSpecTyVar</span> <span class="n" style="color: #333;">spec</span> <span class="p">]</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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803
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<pre style="margin: 0;"> <span id="LC803" class="line" lang="haskell"> <span class="n" style="color: #333;">req_wrap</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dict_req_wrap</span> <span class="o" style="font-weight: 600;"><.></span> <span class="n" style="color: #333;">mkWpTyApps</span> <span class="n" style="color: #333;">in_inst_tys</span></span>
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804
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<pre style="margin: 0;"> <span id="LC804" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/d09e7e41cf79fe981a61eae46a93d8881859ff1f...64ab97bfdae8ca094d677ad27aecf514e7acafd0#aebe2c3d616f6843166d2657bed048898add6bc9"><strong>compiler/GHC/Tc/Instance/Class.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">@@ -387,10 +387,9 @@ makeLitDict clas ty et</td>
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<pre style="margin: 0;"> <span id="LC387" 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="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">co_dict</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInstNewTyCon_maybe</span> <span class="p">(</span><span class="n" style="color: #333;">classTyCon</span> <span class="n" style="color: #333;">clas</span><span class="p">)</span> <span class="p">[</span><span class="n" style="color: #333;">ty</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC388" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- co_dict :: KnownNat n ~ SNat n</span></span>
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389
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<pre style="margin: 0;"> <span id="LC389" class="line" lang="haskell"> <span class="p">,</span> <span class="p">[</span> <span class="n" style="color: #333;">meth</span> <span class="p">]</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">classMethods</span> <span class="n" style="color: #333;">clas</span></span>
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390
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<pre style="margin: 0;">-<span id="LC390" 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;">tcRep</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tyConAppTyCon_maybe</span> <span class="c1" style="color: #998; font-style: italic;">-- SNat</span></span>
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391
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<pre style="margin: 0;">-<span id="LC391" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">funResultTy</span> <span class="c1" style="color: #998; font-style: italic;">-- SNat n</span></span>
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392
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<pre style="margin: 0;">-<span id="LC392" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">dropForAlls</span> <span class="c1" style="color: #998; font-style: italic;">-- KnownNat n => SNat n</span></span>
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393
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<pre style="margin: 0;">-<span id="LC393" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">meth</span> <span class="c1" style="color: #998; font-style: italic;">-- forall n. KnownNat n => SNat n</span></span>
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<pre style="margin: 0;">+<span id="LC390" 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;">tcRep</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tyConAppTyCon_maybe</span> <span class="p">(</span><span class="n" style="color: #333;">classMethodTy</span> <span class="n" style="color: #333;">meth</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC391" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If the method type is forall n. KnownNat n => SNat n</span></span>
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<pre style="margin: 0;">+<span id="LC392" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- then tcRep is SNat</span></span>
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<pre style="margin: 0;"> <span id="LC393" 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="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">co_rep</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInstNewTyCon_maybe</span> <span class="n" style="color: #333;">tcRep</span> <span class="p">[</span><span class="n" style="color: #333;">ty</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC394" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- SNat n ~ Integer</span></span>
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<pre style="margin: 0;"> <span id="LC395" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ev_tm</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkEvCast</span> <span class="n" style="color: #333;">et</span> <span class="p">(</span><span class="n" style="color: #333;">mkTcSymCo</span> <span class="p">(</span><span class="n" style="color: #333;">mkTcTransCo</span> <span class="n" style="color: #333;">co_dict</span> <span class="n" style="color: #333;">co_rep</span><span class="p">))</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/d09e7e41cf79fe981a61eae46a93d8881859ff1f...64ab97bfdae8ca094d677ad27aecf514e7acafd0#e65390fa5a32c453a81a1c9a3e1c4464d155ca4a"><strong>compiler/GHC/Tc/Module.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">@@ -65,9 +65,10 @@ import GHC.Builtin.Types ( unitTy, mkListTy )</td>
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<pre style="margin: 0;"> <span id="LC65" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Driver.Plugins</span></span>
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<pre style="margin: 0;"> <span id="LC66" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Driver.Session</span></span>
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<pre style="margin: 0;"> <span id="LC67" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Hs</span></span>
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<pre style="margin: 0;">-<span id="LC68" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Iface.Syntax</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">ShowSub</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">showToHeader</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC69" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Iface.Type</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">ShowForAllFlag</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC70" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.PatSyn</span><span class="p">(</span> <span class="n" style="color: #333;">pprPatSynType</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC68" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Iface.Syntax</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">ShowSub</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">showToHeader</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC69" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Iface.Type</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">ShowForAllFlag</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC70" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.PatSyn</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">pprPatSynType</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC71" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Predicate</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">classMethodTy</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC72" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Builtin.Names</span></span>
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73
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<pre style="margin: 0;"> <span id="LC73" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Builtin.Utils</span></span>
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74
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<pre style="margin: 0;"> <span id="LC74" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Name.Reader</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1014,10 +1015,8 @@ checkBootTyCon is_boot tc1 tc2</td>
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1014
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1015
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<pre style="margin: 0;"> <span id="LC1015" class="line" lang="haskell"> <span class="n" style="color: #333;">name2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">idName</span> <span class="n" style="color: #333;">id2</span></span>
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1015
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1016
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<pre style="margin: 0;"> <span id="LC1016" class="line" lang="haskell"> <span class="n" style="color: #333;">pname1</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">name1</span><span class="p">)</span></span>
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1016
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1017
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<pre style="margin: 0;"> <span id="LC1017" class="line" lang="haskell"> <span class="n" style="color: #333;">pname2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">name2</span><span class="p">)</span></span>
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1017
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<pre style="margin: 0;">-<span id="LC1017" class="line" lang="haskell"> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">rho_ty1</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitForAllTys</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">id1</span><span class="p">)</span></span>
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1018
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<pre style="margin: 0;">-<span id="LC1018" class="line" lang="haskell"> <span class="n" style="color: #333;">op_ty1</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">funResultTy</span> <span class="n" style="color: #333;">rho_ty1</span></span>
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1019
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<pre style="margin: 0;">-<span id="LC1019" class="line" lang="haskell"> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">rho_ty2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitForAllTys</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">id2</span><span class="p">)</span></span>
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1020
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<pre style="margin: 0;">-<span id="LC1020" class="line" lang="haskell"> <span class="n" style="color: #333;">op_ty2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">funResultTy</span> <span class="n" style="color: #333;">rho_ty2</span></span>
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<pre style="margin: 0;">+<span id="LC1018" class="line" lang="haskell"> <span class="n" style="color: #333;">op_ty1</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">classMethodTy</span> <span class="n" style="color: #333;">id1</span></span>
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<pre style="margin: 0;">+<span id="LC1019" class="line" lang="haskell"> <span class="n" style="color: #333;">op_ty2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">classMethodTy</span> <span class="n" style="color: #333;">id2</span></span>
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1020
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<pre style="margin: 0;"> <span id="LC1020" class="line" lang="haskell"></span>
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1022
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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;">eqAT</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ATI</span> <span class="n" style="color: #333;">tc1</span> <span class="n" style="color: #333;">def_ats1</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ATI</span> <span class="n" style="color: #333;">tc2</span> <span class="n" style="color: #333;">def_ats2</span><span class="p">)</span></span>
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1023
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1022
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<pre style="margin: 0;"> <span id="LC1022" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">checkBootTyCon</span> <span class="n" style="color: #333;">is_boot</span> <span class="n" style="color: #333;">tc1</span> <span class="n" style="color: #333;">tc2</span> <span class="p">`</span><span class="n" style="color: #333;">andThenCheck</span><span class="p">`</span></span>
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<li id="54436e21ea530a66a8a71bcc01c836f4740b8f02">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/d09e7e41cf79fe981a61eae46a93d8881859ff1f...64ab97bfdae8ca094d677ad27aecf514e7acafd0#54436e21ea530a66a8a71bcc01c836f4740b8f02"><strong>compiler/GHC/Tc/Solver.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1376,7 +1376,7 @@ growThetaTyVars theta tcvs</td>
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<pre style="margin: 0;"> <span id="LC1376" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">transCloVarSet</span> <span class="n" style="color: #333;">mk_next</span> <span class="n" style="color: #333;">seed_tcvs</span></span>
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<pre style="margin: 0;"> <span id="LC1377" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC1378" class="line" lang="haskell"> <span class="n" style="color: #333;">seed_tcvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcvs</span> <span class="p">`</span><span class="n" style="color: #333;">unionVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">tyCoVarsOfTypes</span> <span class="n" style="color: #333;">ips</span></span>
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1379
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<pre style="margin: 0;">-<span id="LC1379" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ips</span><span class="p">,</span> <span class="n" style="color: #333;">non_ips</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">partition</span> <span class="n" style="color: #333;">isIPPred</span> <span class="n" style="color: #333;">theta</span></span>
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<pre style="margin: 0;">+<span id="LC1379" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ips</span><span class="p">,</span> <span class="n" style="color: #333;">non_ips</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">partition</span> <span class="n" style="color: #333;">isIP<span class="idiff left right">Like</span>Pred</span> <span class="n" style="color: #333;">theta</span></span>
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<pre style="margin: 0;"> <span id="LC1380" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Inheriting implicit parameters] in GHC.Tc.Utils.TcType</span></span>
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<pre style="margin: 0;"> <span id="LC1381" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1382" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_next</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span> <span class="c1" style="color: #998; font-style: italic;">-- Maps current set to newly-grown ones</span></span>
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<li id="f018e77421f495c6f75733fee4a511cfe57bebe8">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/d09e7e41cf79fe981a61eae46a93d8881859ff1f...64ab97bfdae8ca094d677ad27aecf514e7acafd0#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">@@ -29,7 +29,7 @@ import GHC.Core.Multiplicity</td>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCo.Rep</span> <span class="c1" style="color: #998; font-style: italic;">-- cleverly decomposes types, good for completeness checking</span></span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Coercion</span></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core</span></span>
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<pre style="margin: 0;">-<span id="LC32" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Id</span><span class="p">(</span> <span class="n" style="color: #333;"><span class="idiff left">idType</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">mkTemplateLocals</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Id</span><span class="p">(</span> <span class="n" style="color: #333;">mkTemplateLocals</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.FamInstEnv</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">FamInstEnvs</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Instance.Family</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">tcTopNormaliseNewTypeTF_maybe</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -541,7 +541,7 @@ mk_strict_superclasses rec_clss (CtGiven { ctev_evar = evar, ctev_loc = loc })</td>
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541
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<pre style="margin: 0;"> <span id="LC541" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_given_desc</span> <span class="n" style="color: #333;">sel_id</span> <span class="n" style="color: #333;">sc_pred</span></span>
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542
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<pre style="margin: 0;"> <span id="LC542" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mk_superclasses</span> <span class="n" style="color: #333;">rec_clss</span> <span class="n" style="color: #333;">given_ev</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">theta</span> <span class="n" style="color: #333;">sc_pred</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC543" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC544" class="line" lang="haskell"> <span class="n" style="color: #333;">sc_pred</span> <span class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">funResultTy</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">piResultTys</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">idType</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">sel_id</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tys</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC544" class="line" lang="haskell"> <span class="n" style="color: #333;">sc_pred</span> <span class="o" style="font-weight: 600;"><span class="idiff left">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">classMethodInstTy</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">sel_id</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">tys</span></span></span>
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<pre style="margin: 0;"> <span id="LC545" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC546" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Nested quantified constraint superclasses]</span></span>
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<pre style="margin: 0;"> <span id="LC547" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_given_desc</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PredType</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PredType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">EvTerm</span><span class="p">)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/d09e7e41cf79fe981a61eae46a93d8881859ff1f...64ab97bfdae8ca094d677ad27aecf514e7acafd0#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">@@ -565,10 +565,10 @@ solveOneFromTheOther ev_i ev_w</td>
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<pre style="margin: 0;"> <span id="LC565" class="line" lang="haskell"> <span class="n" style="color: #333;">ev_id_w</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctEvEvId</span> <span class="n" style="color: #333;">ev_w</span></span>
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<pre style="margin: 0;"> <span id="LC566" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC567" class="line" lang="haskell"> <span class="n" style="color: #333;">different_level_strategy</span> <span class="c1" style="color: #998; font-style: italic;">-- Both Given</span></span>
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<pre style="margin: 0;">-<span id="LC568" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isIPPred</span> <span class="n" style="color: #333;">pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">lvl_w</span> <span class="o" style="font-weight: 600;">></span> <span class="n" style="color: #333;">lvl_i</span> <span class="kr" style="font-weight: 600;">then</span> <span class="kt" style="color: #458; font-weight: 600;">KeepWork</span> <span class="kr" style="font-weight: 600;">else</span> <span class="kt" style="color: #458; font-weight: 600;">KeepInert</span></span>
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<pre style="margin: 0;">-<span id="LC569" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">lvl_w</span> <span class="o" style="font-weight: 600;">></span> <span class="n" style="color: #333;">lvl_i</span> <span class="kr" style="font-weight: 600;">then</span> <span class="kt" style="color: #458; font-weight: 600;">KeepInert</span> <span class="kr" style="font-weight: 600;">else</span> <span class="kt" style="color: #458; font-weight: 600;">KeepWork</span></span>
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<pre style="margin: 0;">+<span id="LC568" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isIP<span class="idiff left right">Like</span>Pred</span> <span class="n" style="color: #333;">pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">lvl_w</span> <span class="o" style="font-weight: 600;">></span> <span class="n" style="color: #333;">lvl_i</span> <span class="kr" style="font-weight: 600;">then</span> <span class="kt" style="color: #458; font-weight: 600;">KeepWork</span> <span class="kr" style="font-weight: 600;">else</span> <span class="kt" style="color: #458; font-weight: 600;">KeepInert</span></span>
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<pre style="margin: 0;">+<span id="LC569" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">lvl_w</span> <span class="o" style="font-weight: 600;">></span> <span class="n" style="color: #333;">lvl_i</span> <span class="kr" style="font-weight: 600;">then</span> <span class="kt" style="color: #458; font-weight: 600;">KeepInert</span> <span class="kr" style="font-weight: 600;">else</span> <span class="kt" style="color: #458; font-weight: 600;">KeepWork</span></span>
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<pre style="margin: 0;"> <span id="LC570" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Replacement vs keeping] (the different-level bullet)</span></span>
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<pre style="margin: 0;">-<span id="LC571" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- For the isIPPred case see Note [Shadowing of Implicit Parameters]</span></span>
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<pre style="margin: 0;">+<span id="LC571" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- For the isIP<span class="idiff left right">Like</span>Pred case see Note [Shadowing of Implicit Parameters]</span></span>
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<pre style="margin: 0;"> <span id="LC572" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC573" class="line" lang="haskell"> <span class="n" style="color: #333;">same_level_strategy</span> <span class="n" style="color: #333;">binds</span> <span class="c1" style="color: #998; font-style: italic;">-- Both Given</span></span>
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<pre style="margin: 0;"> <span id="LC574" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">GivenOrigin</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">InstSC</span> <span class="n" style="color: #333;">s_i</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ctLocOrigin</span> <span class="n" style="color: #333;">loc_i</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">@@ -1070,6 +1070,8 @@ shortCutSolver dflags ev_w ev_i</td>
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1070
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1070
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<pre style="margin: 0;"> <span id="LC1070" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- programs should typecheck regardless of whether we take this step or</span></span>
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1071
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1071
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<pre style="margin: 0;"> <span id="LC1071" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- not. See Note [Shortcut solving]</span></span>
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1072
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1072
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<pre style="margin: 0;"> <span id="LC1072" class="line" lang="haskell"></span>
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1073
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<pre style="margin: 0;">+<span id="LC1073" 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;">isIPLikePred</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvPred</span> <span class="n" style="color: #333;">ev_w</span><span class="p">))</span> <span class="c1" style="color: #998; font-style: italic;">-- Not for implicit parameters (#18627)</span></span>
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1074
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<pre style="margin: 0;">+<span id="LC1074" class="line" lang="haskell"></span>
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1073
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1075
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<pre style="margin: 0;"> <span id="LC1075" 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;">xopt</span> <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">IncoherentInstances</span> <span class="n" style="color: #333;">dflags</span><span class="p">)</span></span>
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1074
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1076
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<pre style="margin: 0;"> <span id="LC1076" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If IncoherentInstances is on then we cannot rely on coherence of proofs</span></span>
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1075
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1077
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<pre style="margin: 0;"> <span id="LC1077" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in order to justify this optimization: The proof provided by the</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">@@ -1078,6 +1080,7 @@ shortCutSolver dflags ev_w ev_i</td>
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1078
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1080
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<pre style="margin: 0;"> <span id="LC1080" class="line" lang="haskell"></span>
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1079
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1081
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<pre style="margin: 0;"> <span id="LC1081" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">gopt</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_SolveConstantDicts</span> <span class="n" style="color: #333;">dflags</span></span>
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1080
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1082
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<pre style="margin: 0;"> <span id="LC1082" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Enabled by the -fsolve-constant-dicts flag</span></span>
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1083
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<pre style="margin: 0;">+<span id="LC1083" class="line" lang="haskell"></span>
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1084
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<pre style="margin: 0;"> <span id="LC1084" 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;">ev_binds_var</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getTcEvBindsVar</span></span>
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1082
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1085
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<pre style="margin: 0;"> <span id="LC1085" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">ev_binds</span> <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;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isCoEvBindsVar</span> <span class="n" style="color: #333;">ev_binds_var</span> <span class="p">),</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ev_w</span> <span class="p">)</span></span>
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1083
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1086
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<pre style="margin: 0;"> <span id="LC1086" class="line" lang="haskell"> <span class="n" style="color: #333;">getTcEvBindsMap</span> <span class="n" style="color: #333;">ev_binds_var</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/d09e7e41cf79fe981a61eae46a93d8881859ff1f...64ab97bfdae8ca094d677ad27aecf514e7acafd0#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">@@ -2526,8 +2526,7 @@ emptyDictMap = emptyTcAppMap</td>
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<pre style="margin: 0;"> <span id="LC2526" class="line" lang="haskell"></span>
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2527
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<pre style="margin: 0;"> <span id="LC2527" class="line" lang="haskell"><span class="n" style="color: #333;">findDict</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DictMap</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Class</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">a</span></span>
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2528
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2528
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<pre style="margin: 0;"> <span id="LC2528" class="line" lang="haskell"><span class="n" style="color: #333;">findDict</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">cls</span> <span class="n" style="color: #333;">tys</span></span>
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2529
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<pre style="margin: 0;">-<span id="LC2529" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isCTupleClass</span> <span class="n" style="color: #333;">cls</span></span>
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<pre style="margin: 0;">-<span id="LC2530" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">any</span> <span class="n" style="color: #333;">hasIPPred</span> <span class="n" style="color: #333;">tys</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Tuples hiding implicit parameters]</span></span>
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<pre style="margin: 0;">+<span id="LC2529" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">hasIPSuperClasses</span> <span class="n" style="color: #333;">cls</span> <span class="n" style="color: #333;">tys</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Tuples hiding implicit parameters]</span></span>
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<pre style="margin: 0;"> <span id="LC2530" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<pre style="margin: 0;"> <span id="LC2531" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2532" 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="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">isCallStackPred</span> <span class="n" style="color: #333;">cls</span> <span class="n" style="color: #333;">tys</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/d09e7e41cf79fe981a61eae46a93d8881859ff1f...64ab97bfdae8ca094d677ad27aecf514e7acafd0#e63425e031ffe9350ee6b1687e506aaea75d11e1"><strong>compiler/GHC/Tc/TyCl/Instance.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">@@ -53,6 +53,7 @@ import GHC.Core ( Expr(..), mkApps, mkVarApps, mkLams )</td>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Make</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">nO_METHOD_BINDING_ERROR_ID</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Unfold</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">mkInlineUnfoldingWithArity</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkDFunUnfolding</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Type</span></span>
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<pre style="margin: 0;">+<span id="LC56" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Predicate</span><span class="p">(</span> <span class="n" style="color: #333;">classMethodInstTy</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC57" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types.Evidence</span></span>
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<pre style="margin: 0;"> <span id="LC58" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCon</span></span>
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<pre style="margin: 0;"> <span id="LC59" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Coercion.Axiom</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">@@ -1631,7 +1632,7 @@ tcMethods dfun_id clas tyvars dfun_ev_vars inst_tys</td>
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<pre style="margin: 0;"> <span id="LC1632" class="line" lang="haskell"> <span class="n" style="color: #333;">nO_METHOD_BINDING_ERROR_ID</span></span>
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<pre style="margin: 0;"> <span id="LC1633" class="line" lang="haskell"> <span class="n" style="color: #333;">error_msg</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">inst_loc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsLit</span> <span class="n" style="color: #333;">noExtField</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsStringPrim</span> <span class="kt" style="color: #458; font-weight: 600;">NoSourceText</span></span>
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1634
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<pre style="margin: 0;"> <span id="LC1634" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">unsafeMkByteString</span> <span class="p">(</span><span class="n" style="color: #333;">error_string</span> <span class="n" style="color: #333;">dflags</span><span class="p">))))</span></span>
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<pre style="margin: 0;">-<span id="LC1634" class="line" lang="haskell"> <span class="n" style="color: #333;">meth_tau</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left">funResultTy</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">piResultTys</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">idType</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">sel_id</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inst_tys</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC1635" class="line" lang="haskell"> <span class="n" style="color: #333;">meth_tau</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left">classMethodInstTy</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">sel_id</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">inst_tys</span></span></span>
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1635
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<pre style="margin: 0;"> <span id="LC1636" class="line" lang="haskell"> <span class="n" style="color: #333;">error_string</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">showSDoc</span> <span class="n" style="color: #333;">dflags</span></span>
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1637
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<pre style="margin: 0;"> <span id="LC1637" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">hcat</span> <span class="p">[</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">inst_loc</span><span class="p">,</span> <span class="n" style="color: #333;">vbar</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">sel_id</span> <span class="p">])</span></span>
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1638
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<pre style="margin: 0;"> <span id="LC1638" class="line" lang="haskell"> <span class="n" style="color: #333;">lam_wrapper</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkWpTyLams</span> <span class="n" style="color: #333;">tyvars</span> <span class="o" style="font-weight: 600;"><.></span> <span class="n" style="color: #333;">mkWpLams</span> <span class="n" style="color: #333;">dfun_ev_vars</span></span>
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<li id="46e7b59eca287d43c19d0d8902b41f5d04f0d268">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/d09e7e41cf79fe981a61eae46a93d8881859ff1f...64ab97bfdae8ca094d677ad27aecf514e7acafd0#46e7b59eca287d43c19d0d8902b41f5d04f0d268"><strong>compiler/GHC/Tc/Types/Evidence.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">@@ -48,6 +48,7 @@ module GHC.Tc.Types.Evidence (</td>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkTcKindCo</span><span class="p">,</span></span>
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49
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcCoercionKind</span><span class="p">,</span></span>
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50
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50
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkTcCoVarCo</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC51" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkTcFamilyTyConAppCo</span><span class="p">,</span></span>
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51
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52
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isTcReflCo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isTcReflexiveCo</span><span class="p">,</span></span>
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52
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcCoercionRole</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">unwrapIP</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">wrapIP</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">@@ -139,6 +140,7 @@ mkTcCoherenceRightCo :: Role -> TcType -> TcCoercionN</td>
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139
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140
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<pre style="margin: 0;"> <span id="LC140" class="line" lang="haskell"><span class="n" style="color: #333;">mkTcPhantomCo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcCoercionN</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;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcCoercionP</span></span>
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<pre style="margin: 0;"> <span id="LC141" class="line" lang="haskell"><span class="n" style="color: #333;">mkTcKindCo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcCoercion</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcCoercionN</span></span>
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<pre style="margin: 0;"> <span id="LC142" class="line" lang="haskell"><span class="n" style="color: #333;">mkTcCoVarCo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CoVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcCoercion</span></span>
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<pre style="margin: 0;">+<span id="LC143" class="line" lang="haskell"><span class="n" style="color: #333;">mkTcFamilyTyConAppCo</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;">TcCoercionN</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcCoercionN</span></span>
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<pre style="margin: 0;"> <span id="LC144" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC145" class="line" lang="haskell"><span class="n" style="color: #333;">tcCoercionKind</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcCoercion</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Pair</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span></span>
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<pre style="margin: 0;"> <span id="LC146" class="line" lang="haskell"><span class="n" style="color: #333;">tcCoercionRole</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcCoercion</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Role</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="172" 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="174" 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">@@ -172,6 +174,7 @@ mkTcCoherenceRightCo = mkCoherenceRightCo</td>
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<pre style="margin: 0;"> <span id="LC174" class="line" lang="haskell"><span class="n" style="color: #333;">mkTcPhantomCo</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkPhantomCo</span></span>
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<pre style="margin: 0;"> <span id="LC175" class="line" lang="haskell"><span class="n" style="color: #333;">mkTcKindCo</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkKindCo</span></span>
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<pre style="margin: 0;"> <span id="LC176" class="line" lang="haskell"><span class="n" style="color: #333;">mkTcCoVarCo</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkCoVarCo</span></span>
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<pre style="margin: 0;">+<span id="LC177" class="line" lang="haskell"><span class="n" style="color: #333;">mkTcFamilyTyConAppCo</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkFamilyTyConAppCo</span></span>
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<pre style="margin: 0;"> <span id="LC178" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC179" class="line" lang="haskell"><span class="n" style="color: #333;">tcCoercionKind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">coercionKind</span></span>
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<pre style="margin: 0;"> <span id="LC180" class="line" lang="haskell"><span class="n" style="color: #333;">tcCoercionRole</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">coercionRole</span></span>
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<li id="5461e7beeb7ae73d7c01f720cbaa3fa2c5333590">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/d09e7e41cf79fe981a61eae46a93d8881859ff1f...64ab97bfdae8ca094d677ad27aecf514e7acafd0#5461e7beeb7ae73d7c01f720cbaa3fa2c5333590"><strong>compiler/GHC/Tc/Utils/TcType.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -79,7 +79,7 @@ module GHC.Tc.Utils.TcType (</td>
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<pre style="margin: 0;"> <span id="LC79" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isFloatingTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isDoubleTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isFloatTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isIntTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isWordTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isStringTy</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC80" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isIntegerTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isNaturalTy</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC81" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isBoolTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isUnitTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isCharTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isCallStackTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isCallStackPred</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC82" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left">hasIPPred</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff right"> </span><span class="nf" style="color: #900; font-weight: 600;">isTauTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isTauTyCon</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcIsTyVarTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcIsForAllTy</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC82" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isTauTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isTauTyCon</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcIsTyVarTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcIsForAllTy</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC83" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isPredTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isTyVarClassPred</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isTyVarHead</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isInsolubleOccursCheck</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC84" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">checkValidClsArgs</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">hasTyVarHead</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC85" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isRigidTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isAlmostFunctionFree</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">@@ -141,7 +141,7 @@ module GHC.Tc.Utils.TcType (</td>
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<pre style="margin: 0;"> <span id="LC141" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkTyConTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkTyVarTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkTyVarTys</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC142" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkTyCoVarTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkTyCoVarTys</span><span class="p">,</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="nf" style="color: #900; font-weight: 600;">isClassPred</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isEqPrimPred</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isIPPred</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isEqPred</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isEqPredClass</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC144" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isClassPred</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isEqPrimPred</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isIP<span class="idiff left right">Like</span>Pred</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isEqPred</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isEqPredClass</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC145" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkClassPred</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC146" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcSplitDFunTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcSplitDFunHead</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcSplitMethodTy</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC147" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isRuntimeRepVar</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isKindLevPoly</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">@@ -1746,7 +1746,7 @@ pickCapturedPreds</td>
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<pre style="margin: 0;"> <span id="LC1746" class="line" lang="haskell"><span class="n" style="color: #333;">pickCapturedPreds</span> <span class="n" style="color: #333;">qtvs</span> <span class="n" style="color: #333;">theta</span></span>
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<pre style="margin: 0;"> <span id="LC1747" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filter</span> <span class="n" style="color: #333;">captured</span> <span class="n" style="color: #333;">theta</span></span>
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<pre style="margin: 0;"> <span id="LC1748" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC1749" class="line" lang="haskell"> <span class="n" style="color: #333;">captured</span> <span class="n" style="color: #333;">pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isIPPred</span> <span class="n" style="color: #333;">pred</span> <span class="o" style="font-weight: 600;">||</span> <span class="p">(</span><span class="n" style="color: #333;">tyCoVarsOfType</span> <span class="n" style="color: #333;">pred</span> <span class="p">`</span><span class="n" style="color: #333;">intersectsVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">qtvs</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1749" class="line" lang="haskell"> <span class="n" style="color: #333;">captured</span> <span class="n" style="color: #333;">pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isIP<span class="idiff left right">Like</span>Pred</span> <span class="n" style="color: #333;">pred</span> <span class="o" style="font-weight: 600;">||</span> <span class="p">(</span><span class="n" style="color: #333;">tyCoVarsOfType</span> <span class="n" style="color: #333;">pred</span> <span class="p">`</span><span class="n" style="color: #333;">intersectsVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">qtvs</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1750" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1751" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1752" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Superclasses</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/d09e7e41cf79fe981a61eae46a93d8881859ff1f...64ab97bfdae8ca094d677ad27aecf514e7acafd0#8bdb62b981f38737157a853655e494433eea6796"><strong>ghc.mk</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">@@ -1168,7 +1168,8 @@ SRC_DIST_TESTSUITE_TARBALL = $(SRC_DIST_ROOT)/$(SRC_DIST_TESTSUITE_NAME).</td>
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<pre style="margin: 0;"> <span id="LC1168" class="line" lang="make"><span class="c" style="color: #998; font-style: italic;"># Files to include in source distributions</span></span>
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<pre style="margin: 0;"> <span id="LC1169" class="line" lang="make"><span class="c" style="color: #998; font-style: italic;">#</span></span>
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<pre style="margin: 0;"> <span id="LC1170" class="line" lang="make"><span class="nv" style="color: #008080;">SRC_DIST_GHC_DIRS</span> <span class="o" style="font-weight: 600;">=</span> mk rules docs distrib bindisttest libffi includes <span class="se" style="color: #d14;">\</span></span>
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<pre style="margin: 0;">-<span id="LC1171" class="line" lang="make"> utils docs rts compiler ghc driver libraries libffi-tarballs</span>
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<pre style="margin: 0;">+<span id="LC1171" class="line" lang="make"> utils docs rts compiler ghc driver libraries libffi-tarballs <span class="se" style="color: #d14;">\</span></span>
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<pre style="margin: 0;">+<span id="LC1172" class="line" lang="make"> hadrian</span>
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<pre style="margin: 0;"> <span id="LC1173" class="line" lang="make"><span class="nv" style="color: #008080;">SRC_DIST_GHC_FILES</span> <span class="o" style="font-weight: 600;">+=</span> <span class="se" style="color: #d14;">\</span></span>
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<pre style="margin: 0;"> <span id="LC1174" class="line" lang="make"> configure.ac config.guess config.sub configure <span class="se" style="color: #d14;">\</span></span>
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<pre style="margin: 0;"> <span id="LC1175" class="line" lang="make"> aclocal.m4 README.md ANNOUNCE HACKING.md INSTALL.md LICENSE Makefile <span class="se" style="color: #d14;">\</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">@@ -1209,6 +1210,7 @@ sdist-ghc-prep-tree :</td>
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<pre style="margin: 0;"> <span id="LC1210" class="line" lang="make"> <span class="nb" style="color: #0086b3;">cd</span> <span class="nv" style="color: #008080;">$(SRC_DIST_GHC_DIR)</span> <span class="o" style="font-weight: 600;">&&</span> <span class="nv" style="color: #008080;">$(MAKE)</span> distclean</span>
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<pre style="margin: 0;"> <span id="LC1211" class="line" lang="make"> <span class="nf" style="color: #900; font-weight: 600;">$(</span><span class="nb" style="color: #0086b3;">call</span> removeTrees,<span class="nv" style="color: #008080;">$(SRC_DIST_GHC_DIR)</span>/libraries/tarballs/<span class="nf" style="color: #900; font-weight: 600;">)</span></span>
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1212
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<pre style="margin: 0;"> <span id="LC1212" class="line" lang="make"> <span class="nf" style="color: #900; font-weight: 600;">$(</span><span class="nb" style="color: #0086b3;">call</span> removeTrees,<span class="nv" style="color: #008080;">$(SRC_DIST_GHC_DIR)</span>/libraries/stamp/<span class="nf" style="color: #900; font-weight: 600;">)</span></span>
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1213
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<pre style="margin: 0;">+<span id="LC1213" class="line" lang="make"> <span class="nf" style="color: #900; font-weight: 600;">$(</span><span class="nb" style="color: #0086b3;">call</span> removeTrees,<span class="nv" style="color: #008080;">$(SRC_DIST_GHC_DIR)</span>/hadrian/_build/ <span class="o" style="font-weight: 600;">(</span>SRC_DIST_GHC_DIR<span class="nf" style="color: #900; font-weight: 600;">)</span>/hadrian/dist-newstyle/<span class="nf" style="color: #900; font-weight: 600;">)</span></span>
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1214
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<pre style="margin: 0;"> <span id="LC1214" class="line" lang="make"> <span class="nf" style="color: #900; font-weight: 600;">$(</span><span class="nb" style="color: #0086b3;">call</span> removeTrees,<span class="nv" style="color: #008080;">$(SRC_DIST_GHC_DIR)</span>/compiler/stage[123]<span class="nf" style="color: #900; font-weight: 600;">)</span></span>
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1215
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<pre style="margin: 0;"> <span id="LC1215" class="line" lang="make"> <span class="nf" style="color: #900; font-weight: 600;">$(</span><span class="nb" style="color: #0086b3;">call</span> removeFiles,<span class="nv" style="color: #008080;">$(SRC_DIST_GHC_DIR)</span>/mk/build.mk<span class="nf" style="color: #900; font-weight: 600;">)</span></span>
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1214
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1216
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<pre style="margin: 0;"> <span id="LC1216" class="line" lang="make"> <span class="nf" style="color: #900; font-weight: 600;">$(</span><span class="nb" style="color: #0086b3;">call</span> removeFiles,<span class="nv" style="color: #008080;">$(SRC_DIST_GHC_DIR)</span>/rts/rts.cabal<span class="nf" style="color: #900; font-weight: 600;">)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/d09e7e41cf79fe981a61eae46a93d8881859ff1f...64ab97bfdae8ca094d677ad27aecf514e7acafd0#9ac3b381002bb0296436d38ebcf91cf6fc5ac9ea"><strong>testsuite/tests/indexed-types/should_compile/T18809.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE GADTs, TypeFamilies #-}</span></span>
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2
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T18809</span> <span class="kr" style="font-weight: 600;">where</span></span>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>
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5
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Ordinary</span></span>
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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">F2</span> <span class="n" style="color: #333;">s</span> <span class="kr" style="font-weight: 600;">where</span></span>
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7
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MkF2</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">{</span> <span class="n" style="color: #333;">foo2</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">F2</span> <span class="n" style="color: #333;">s</span></span>
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8
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"></span>
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9
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="n" style="color: #333;">bar2</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">F2</span> <span class="n" style="color: #333;">s</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">F2</span> <span class="n" style="color: #333;">s</span></span>
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10
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="n" style="color: #333;">bar2</span> <span class="n" style="color: #333;">z</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">z</span> <span class="p">{</span> <span class="n" style="color: #333;">foo2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">y</span> <span class="p">}</span></span>
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11
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"></span>
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12
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- GADT</span></span>
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13
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">F1</span> <span class="n" style="color: #333;">s</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<td class="diff-line-num new new_line" data-linenumber="14" 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">
14
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MkF1</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">{</span> <span class="n" style="color: #333;">foo1</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">F1</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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15
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"><span class="n" style="color: #333;">bar1</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">F1</span> <span class="n" style="color: #333;">s</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">F1</span> <span class="n" style="color: #333;">s</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"><span class="n" style="color: #333;">bar1</span> <span class="n" style="color: #333;">z</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">z</span> <span class="p">{</span> <span class="n" style="color: #333;">foo1</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">y</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Orinary data family</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">F3</span> <span class="n" style="color: #333;">a</span></span>
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21
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">F3</span> <span class="p">(</span><span class="n" style="color: #333;">s</span><span class="p">,</span><span class="n" style="color: #333;">t</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MkF2b</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">{</span> <span class="n" style="color: #333;">foo3</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">F3</span> <span class="p">(</span><span class="n" style="color: #333;">s</span><span class="p">,</span><span class="n" style="color: #333;">t</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"><span class="n" style="color: #333;">bar3</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">F3</span> <span class="p">(</span><span class="n" style="color: #333;">s</span><span class="p">,</span><span class="n" style="color: #333;">t</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">F3</span> <span class="p">(</span><span class="n" style="color: #333;">s</span><span class="p">,</span><span class="n" style="color: #333;">t</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"><span class="n" style="color: #333;">bar3</span> <span class="n" style="color: #333;">z</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">z</span> <span class="p">{</span><span class="n" style="color: #333;">foo3</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">y</span><span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- GADT + data family</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">F4</span> <span class="n" style="color: #333;">a</span></span>
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29
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">F4</span> <span class="p">(</span><span class="n" style="color: #333;">s</span><span class="p">,</span><span class="n" style="color: #333;">t</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MkF2a</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">{</span> <span class="n" style="color: #333;">foo4</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">F4</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="p">,</span><span class="n" style="color: #333;">t</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"><span class="n" style="color: #333;">bar4</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">F4</span> <span class="p">(</span><span class="n" style="color: #333;">s</span><span class="p">,</span><span class="n" style="color: #333;">t</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">F4</span> <span class="p">(</span><span class="n" style="color: #333;">s</span><span class="p">,</span><span class="n" style="color: #333;">t</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="haskell"><span class="n" style="color: #333;">bar4</span> <span class="n" style="color: #333;">z</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">z</span> <span class="p">{</span> <span class="n" style="color: #333;">foo4</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">y</span><span class="p">}</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/d09e7e41cf79fe981a61eae46a93d8881859ff1f...64ab97bfdae8ca094d677ad27aecf514e7acafd0#58b9bc2ffb1c7d7b545e6aada524a5d53266e95e"><strong>testsuite/tests/indexed-types/should_compile/all.T</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">@@ -296,3 +296,4 @@ test('T17056', normal, compile, [''])</td>
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296
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<pre style="margin: 0;"> <span id="LC296" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17405</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">multimod_compile</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">T17405c</span><span class="p">',</span> <span class="p">'</span><span class="s1" style="color: #d14;">-v0</span><span class="p">'])</span></span>
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297
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297
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<pre style="margin: 0;"> <span id="LC297" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17923</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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298
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298
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<pre style="margin: 0;"> <span id="LC298" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18065</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">-O</span><span class="p">'])</span></span>
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299
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<pre style="margin: 0;">+<span id="LC299" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18809</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">-O</span><span class="p">'])</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/d09e7e41cf79fe981a61eae46a93d8881859ff1f...64ab97bfdae8ca094d677ad27aecf514e7acafd0#db575e081e1764bd580624cab286af92c361e338"><strong>testsuite/tests/simplCore/should_compile/T18649.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE ImplicitParams #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE ConstraintKinds #-}</span></span>
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3
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE FlexibleContexts #-}</span></span>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>
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5
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">Test</span> <span class="kr" style="font-weight: 600;">where</span></span>
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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Prelude</span></span>
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8
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">Hidden</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=</span></span>
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10
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"> <span class="p">(</span> <span class="o" style="font-weight: 600;">?</span><span class="n" style="color: #333;">enable</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span> <span class="n" style="color: #333;">a</span> <span class="c1" style="color: #998; font-style: italic;">-- removing this "fixes" the issue</span></span>
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12
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"> <span class="p">)</span></span>
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13
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"></span>
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14
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# NOINLINE a #-}</span></span>
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15
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Hidden</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Integer</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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16
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"><span class="n" style="color: #333;">a</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="o" style="font-weight: 600;">?</span><span class="n" style="color: #333;">enable</span></span>
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17
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"><span class="n" style="color: #333;">system</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Hidden</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"><span class="n" style="color: #333;">system</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">a</span> <span class="mi" style="color: #099;">0</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"><span class="n" style="color: #333;">topEntity</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"><span class="n" style="color: #333;">topEntity</span> <span class="n" style="color: #333;">ena</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">let</span> <span class="o" style="font-weight: 600;">?</span><span class="n" style="color: #333;">enable</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ena</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="n" style="color: #333;">system</span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"><span class="n" style="color: #333;">someVar</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">let</span> <span class="o" style="font-weight: 600;">?</span><span class="n" style="color: #333;">enable</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="LC26" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="n" style="color: #333;">system</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/d09e7e41cf79fe981a61eae46a93d8881859ff1f...64ab97bfdae8ca094d677ad27aecf514e7acafd0#fb99e471747eafcf334c714ee478740a4b9f4198"><strong>testsuite/tests/simplCore/should_compile/T18649.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">==================== Tidy Core rules ====================</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/d09e7e41cf79fe981a61eae46a93d8881859ff1f...64ab97bfdae8ca094d677ad27aecf514e7acafd0#fc07c260b75644727a8cdc1af5c861a44d4bfb5e"><strong>testsuite/tests/simplCore/should_compile/all.T</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">@@ -336,3 +336,6 @@ test('T18589', normal, compile, ['-dcore-lint -O'])</td>
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<pre style="margin: 0;"> <span id="LC336" class="line" lang="perl"></span>
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<pre style="margin: 0;"> <span id="LC337" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18747A</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC338" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18747B</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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339
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<pre style="margin: 0;">+<span id="LC339" class="line" lang="perl"></span>
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<pre style="margin: 0;">+<span id="LC340" class="line" lang="perl"><span class="c1" style="color: #998; font-style: italic;"># T18649 should /not/ generate a specialisation rule</span></span>
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<pre style="margin: 0;">+<span id="LC341" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18649</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">-O -ddump-rules -Wno-simplifiable-class-constraints</span><span class="p">'])</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/d09e7e41cf79fe981a61eae46a93d8881859ff1f...64ab97bfdae8ca094d677ad27aecf514e7acafd0#6f33783c8d13aee2994cdd57addf2f97a4f8b849"><strong>testsuite/tests/typecheck/should_run/T18627.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE DataKinds #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE ImplicitParams #-}</span></span>
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3
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE MultiParamTypeClasses #-}</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">Main</span> <span class="kr" style="font-weight: 600;">where</span></span>
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5
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"></span>
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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Classes</span></span>
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7
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"></span>
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8
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">IP</span> <span class="s" style="color: #d14;">"x"</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<td class="diff-line-num new new_line" data-linenumber="9" 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">
9
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"> <span class="n" style="color: #333;">ip</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">21</span></span>
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10
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"></span>
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11
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="n" style="color: #333;">baz</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="o" style="font-weight: 600;">?</span><span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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12
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="n" style="color: #333;">baz</span> <span class="o" style="font-weight: 600;">=</span> <span class="o" style="font-weight: 600;">?</span><span class="n" style="color: #333;">x</span></span>
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13
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"></span>
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14
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="n" style="color: #333;">main</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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15
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><span class="n" style="color: #333;">main</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">let</span> <span class="o" style="font-weight: 600;">?</span><span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">42</span></span>
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16
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="n" style="color: #333;">print</span> <span class="n" style="color: #333;">baz</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/d09e7e41cf79fe981a61eae46a93d8881859ff1f...64ab97bfdae8ca094d677ad27aecf514e7acafd0#25acb6208a3348d849f692d01e26d759ac4e8979"><strong>testsuite/tests/typecheck/should_run/T18627.stdout</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">42</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/d09e7e41cf79fe981a61eae46a93d8881859ff1f...64ab97bfdae8ca094d677ad27aecf514e7acafd0#8db0e99055bd439c988ea726deb76570d8736a55"><strong>testsuite/tests/typecheck/should_run/all.T</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="146" 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="146" 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">@@ -146,3 +146,4 @@ test('UnliftedNewtypesDependentFamilyRun', normal, compile_and_run, [''])</td>
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146
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146
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<pre style="margin: 0;"> <span id="LC146" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">UnliftedNewtypesIdentityRun</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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147
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147
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<pre style="margin: 0;"> <span id="LC147" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">UnliftedNewtypesCoerceRun</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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148
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148
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<pre style="margin: 0;"> <span id="LC148" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17104</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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<td class="diff-line-num new new_line" data-linenumber="149" 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">
149
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<pre style="margin: 0;">+<span id="LC149" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18627</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">-O</span><span class="p">'])</span> <span class="c1" style="color: #998; font-style: italic;"># Optimisation shows up the bug</span></span></pre>
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