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<h3>
Simon Peyton Jones pushed to branch wip/T18649
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f0789d995cd92304f8ddcbfba90da5b75f83754d">f0789d99</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-09-11T09:14:58+01:00</i>
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<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.
</pre>
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<h4>16 changed files:</h4>
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<li class="file-stats">
<a href="#ab22d7ae4d245581b701367e386d7e886e416e76">
compiler/GHC/Core/Opt/Specialise.hs
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<li class="file-stats">
<a href="#0ca1508e5b0cedec2f19fe10e414597184209573">
compiler/GHC/Core/Predicate.hs
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<li class="file-stats">
<a href="#aebe2c3d616f6843166d2657bed048898add6bc9">
compiler/GHC/Tc/Instance/Class.hs
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<li class="file-stats">
<a href="#e65390fa5a32c453a81a1c9a3e1c4464d155ca4a">
compiler/GHC/Tc/Module.hs
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<li class="file-stats">
<a href="#54436e21ea530a66a8a71bcc01c836f4740b8f02">
compiler/GHC/Tc/Solver.hs
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<li class="file-stats">
<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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<li class="file-stats">
<a href="#e63425e031ffe9350ee6b1687e506aaea75d11e1">
compiler/GHC/Tc/TyCl/Instance.hs
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<li class="file-stats">
<a href="#5461e7beeb7ae73d7c01f720cbaa3fa2c5333590">
compiler/GHC/Tc/Utils/TcType.hs
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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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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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<a href="#6f33783c8d13aee2994cdd57addf2f97a4f8b849">
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testsuite/tests/typecheck/should_run/T18627.hs
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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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<h4>Changes:</h4>
<li id="ab22d7ae4d245581b701367e386d7e886e416e76">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f0789d995cd92304f8ddcbfba90da5b75f83754d#ab22d7ae4d245581b701367e386d7e886e416e76"><strong>compiler/GHC/Core/Opt/Specialise.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2514" 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">@@ -2514,9 +2514,12 @@ mkCallUDs' env f args</td>
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<pre style="margin: 0;"> <span id="LC2514" 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="LC2515" 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="LC2516" 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="LC2517" 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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<td class="diff-line-num old old_line" data-linenumber="2518" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC2518" 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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<td class="diff-line-num new old_line" data-linenumber="2519" 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="LC2517" 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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<td class="diff-line-num new new_line" data-linenumber="2518" 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="LC2518" 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="LC2519" 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="LC2520" 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="LC2521" 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="LC2522" class="line" lang="haskell"></span>
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<td class="diff-line-num new_line" data-linenumber="2523" 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="LC2523" 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="LC2524" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2525" 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="diff-line-num unfold js-unfold new_line" data-linenumber="2532" 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">@@ -2529,41 +2532,18 @@ mkCallUDs' env f args</td>
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<pre style="margin: 0;"> <span id="LC2532" 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="LC2533" 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="LC2534" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2532" 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="LC2533" 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="LC2534" 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="LC2535" 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="LC2536" 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="LC2537" 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="LC2538" 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="LC2539" class="line" lang="haskell"></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;">{-</span></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 [Type determines value]</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;">Only specialise on non-IP *class* params, because these are the ones</span></span>
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<pre style="margin: 0;">-<span id="LC2544" 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="LC2545" 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="LC2546" 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="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-impicit-parameter predicates, because these</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;">are the ones whose *type* determines their *value*. In particular,</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;">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="LC2540" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">implicit param is! See #7101.</span></span>
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2541
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<pre style="margin: 0;"> <span id="LC2541" class="line" lang="haskell"></span>
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2548
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2542
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<pre style="margin: 0;"> <span id="LC2542" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So we treat implicit params just like ordinary arguments for the</span></span>
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2549
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2543
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<pre style="margin: 0;"> <span id="LC2543" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">purposes of specialisation. Note that we still want to specialise</span></span>
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2550
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2544
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<pre style="margin: 0;"> <span id="LC2544" 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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2551
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2545
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<pre style="margin: 0;"> <span id="LC2545" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">class params; see #17930.</span></span>
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2552
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2546
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<pre style="margin: 0;"> <span id="LC2546" class="line" lang="haskell"></span>
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2553
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<pre style="margin: 0;">-<span id="LC2553" 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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2554
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<pre style="margin: 0;">-<span id="LC2554" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">example, consider</span></span>
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2555
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<pre style="margin: 0;">-<span id="LC2555" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type family D (v::*->*) :: Constraint</span></span>
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2556
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<pre style="margin: 0;">-<span id="LC2556" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type instance D [] = ()</span></span>
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2557
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<pre style="margin: 0;">-<span id="LC2557" 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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2558
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<pre style="margin: 0;">-<span id="LC2558" 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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2559
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<pre style="margin: 0;">-<span id="LC2559" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> () |> (g :: () ~ D [])</span></span>
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2560
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<pre style="margin: 0;">-<span id="LC2560" 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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2561
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<pre style="margin: 0;">-<span id="LC2561" class="line" lang="haskell"></span>
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2562
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<pre style="margin: 0;">-<span id="LC2562" 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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2563
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<pre style="margin: 0;">-<span id="LC2563" 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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2564
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<pre style="margin: 0;">-<span id="LC2564" 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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2565
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<pre style="margin: 0;">-<span id="LC2565" 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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2566
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<pre style="margin: 0;">-<span id="LC2566" class="line" lang="haskell"></span>
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2567
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2547
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<pre style="margin: 0;"> <span id="LC2547" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Interesting dictionary arguments]</span></span>
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2568
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2548
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<pre style="margin: 0;"> <span id="LC2548" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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2569
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2549
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<pre style="margin: 0;"> <span id="LC2549" 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/-/commit/f0789d995cd92304f8ddcbfba90da5b75f83754d#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">@@ -39,12 +40,10 @@ import GHC.Core.Multiplicity ( scaledThing )</td>
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<pre style="margin: 0;"> <span id="LC40" 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.Builtin.Names</span></span>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="haskell"></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.Data.FastString</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.Outputable</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.Utils.Misc</span></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Panic</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="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="LC47" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC48" 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="LC49" 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">@@ -95,6 +94,26 @@ getClassPredTys_maybe ty = case splitTyConApp_maybe ty of</td>
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<pre style="margin: 0;"> <span id="LC94" 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="LC95" 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="LC96" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC97" 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="LC98" 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="LC99" 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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<pre style="margin: 0;">+<span id="LC100" 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="LC101" 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="LC102" 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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<pre style="margin: 0;">+<span id="LC103" 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;">$</span> <span class="c1" style="color: #998; font-style: italic;">-- meth_ty</span></span>
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<pre style="margin: 0;">+<span id="LC104" class="line" lang="haskell"> <span class="n" style="color: #333;">dropForAlls</span> <span class="o" style="font-weight: 600;">$</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="LC105" 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="LC106" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC107" 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="LC108" 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="LC109" 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="LC110" 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="LC111" 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="LC112" 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="LC113" 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="LC114" 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="LC115" 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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<pre style="margin: 0;">+<span id="LC116" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC117" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- --------------------- Equality predicates ---------------------------------</span></span>
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118
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<pre style="margin: 0;"> <span id="LC118" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC119" 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">@@ -170,7 +189,7 @@ isEqPredClass :: Class -> Bool</td>
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<pre style="margin: 0;"> <span id="LC189" 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="LC190" 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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<pre style="margin: 0;"> <span id="LC191" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC173" 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="LC192" 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="LC193" 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="LC194" 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="LC195" 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">@@ -186,9 +205,15 @@ isEqPred ty -- True of (a ~ b) and (a ~~ b)</td>
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<pre style="margin: 0;"> <span id="LC205" 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="LC206" 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="LC207" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC189" 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="LC190" 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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191
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<pre style="margin: 0;">-<span id="LC191" 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="LC208" 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="LC209" 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="LC210" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC211" class="line" lang="haskell"></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;">* *</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;"> Implicit parameters</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 class="cm" style="color: #998; font-style: italic;">********************************************************************* -}</span></span>
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<pre style="margin: 0;"> <span id="LC217" class="line" lang="haskell"></span>
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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="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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<pre style="margin: 0;"> <span id="LC219" 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">@@ -197,31 +222,103 @@ isIPTyCon tc = tc `hasKey` ipClassKey</td>
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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="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="LC223" 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="LC224" class="line" lang="haskell"></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="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="LC201" 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="LC225" 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="LC226" 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="LC227" 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="LC228" class="line" lang="haskell"></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="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="LC204" 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="LC205" 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="LC206" 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="LC207" 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="LC208" 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="LC209" class="line" lang="haskell"></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="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="LC211" 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="LC212" 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="LC213" 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="LC214" 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="LC215" 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="LC216" 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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<pre style="margin: 0;"> <span id="LC229" class="line" lang="haskell"></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="LC219" 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="LC230" 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="LC231" 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="LC232" 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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<pre style="margin: 0;">+<span id="LC233" 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="LC234" 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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<pre style="margin: 0;">+<span id="LC235" 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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<pre style="margin: 0;">+<span id="LC236" 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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237
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<pre style="margin: 0;">+<span id="LC237" 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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238
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<pre style="margin: 0;">+<span id="LC238" class="line" lang="haskell"></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="n" style="color: #333;">otherwise</span></span>
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240
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<pre style="margin: 0;">+<span id="LC240" 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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241
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<pre style="margin: 0;">+<span id="LC241" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- a Constraint-ranged family; #7785</span></span>
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242
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<pre style="margin: 0;">+<span id="LC242" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC243" 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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244
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<pre style="margin: 0;">+<span id="LC244" 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="LC245" 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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246
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<pre style="margin: 0;">+<span id="LC246" class="line" lang="haskell"></span>
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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="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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<pre style="margin: 0;">+<span id="LC248" 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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249
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<pre style="margin: 0;">+<span id="LC249" 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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250
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<pre style="margin: 0;">+<span id="LC250" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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251
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<pre style="margin: 0;">+<span id="LC251" 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="LC252" 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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253
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<pre style="margin: 0;">+<span id="LC253" 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="LC254" 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="LC255" class="line" lang="haskell"></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="kt" style="color: #458; font-weight: 600;">RecTcChecker</span></span>
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257
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<pre style="margin: 0;">+<span id="LC257" 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="LC258" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC259" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Local implicit parameters]</span></span>
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260
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<pre style="margin: 0;">+<span id="LC260" 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="LC261" 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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262
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<pre style="margin: 0;">+<span id="LC262" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">superclasses, is an implicit parameter.</span></span>
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263
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<pre style="margin: 0;">+<span id="LC263" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC264" 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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<pre style="margin: 0;">+<span id="LC265" 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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<pre style="margin: 0;">+<span id="LC266" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> let ?x = True in ...</span></span>
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<pre style="margin: 0;">+<span id="LC267" 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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<pre style="margin: 0;">+<span id="LC268" 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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<pre style="margin: 0;">+<span id="LC269" 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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<pre style="margin: 0;">+<span id="LC270" 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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<pre style="margin: 0;">+<span id="LC271" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC272" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Several wrinkles</span></span>
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<pre style="margin: 0;">+<span id="LC273" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC274" 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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<pre style="margin: 0;">+<span id="LC275" 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="LC276" 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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<pre style="margin: 0;">+<span id="LC277" 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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<pre style="margin: 0;">+<span id="LC278" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (% Eq a, ?x::Int %)</span></span>
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<pre style="margin: 0;">+<span id="LC279" 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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<pre style="margin: 0;">+<span id="LC280" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> implicit parameter.</span></span>
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<pre style="margin: 0;">+<span id="LC281" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC282" 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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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;"> class sc => C sc where ...</span></span>
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<pre style="margin: 0;">+<span id="LC284" 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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285
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<pre style="margin: 0;">+<span id="LC285" 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="LC286" 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="LC287" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC288" 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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289
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<pre style="margin: 0;">+<span id="LC289" 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="LC290" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC291" 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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<pre style="margin: 0;">+<span id="LC292" 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="LC293" 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="LC294" 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="LC295" 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="LC296" 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="LC297" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> () |> (g :: () ~ D [])</span></span>
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298
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<pre style="margin: 0;">+<span id="LC298" 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="LC299" class="line" lang="haskell"></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;">So the question is: can an implicit parameter "hide inside" a</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-family constraint like (D a). Well, no. We don't allow</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;"> type instance D Maybe = ?x:Int</span></span>
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<pre style="margin: 0;">+<span id="LC303" 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="LC304" class="line" lang="haskell"></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;">Small worries (Sept 20):</span></span>
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<pre style="margin: 0;">+<span id="LC306" 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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<pre style="margin: 0;">+<span id="LC307" 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="LC308" 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="LC309" 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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<pre style="margin: 0;">+<span id="LC310" 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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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;"> obscure anyway.</span></span>
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312
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<pre style="margin: 0;">+<span id="LC312" 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="LC313" 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="LC314" 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="LC315" 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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<pre style="margin: 0;">+<span id="LC316" class="line" lang="haskell"></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;">* *</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;"> Evidence variables</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="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="LC224" 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 class="cm" style="color: #998; font-style: italic;">********************************************************************* -}</span></span>
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<pre style="margin: 0;"> <span id="LC322" class="line" lang="haskell"></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="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="LC324" 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/-/commit/f0789d995cd92304f8ddcbfba90da5b75f83754d#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">@@ -388,10 +388,9 @@ makeLitDict clas ty et</td>
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388
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<pre style="margin: 0;"> <span id="LC388" 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="LC389" 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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<pre style="margin: 0;"> <span id="LC390" 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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391
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<pre style="margin: 0;">-<span id="LC391" 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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392
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<pre style="margin: 0;">-<span id="LC392" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">funResultTy</span> <span class="c1" style="color: #998; font-style: italic;">-- SNat n</span></span>
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393
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<pre style="margin: 0;">-<span id="LC393" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">dropForAlls</span> <span class="c1" style="color: #998; font-style: italic;">-- KnownNat n => SNat n</span></span>
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394
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<pre style="margin: 0;">-<span id="LC394" 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="LC391" 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="LC392" 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="LC393" 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="LC394" 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="LC395" 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="LC396" 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/-/commit/f0789d995cd92304f8ddcbfba90da5b75f83754d#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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<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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<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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<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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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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<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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<pre style="margin: 0;"> <span id="LC1020" class="line" lang="haskell"></span>
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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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<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/-/commit/f0789d995cd92304f8ddcbfba90da5b75f83754d#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">@@ -1377,7 +1377,7 @@ growThetaTyVars theta tcvs</td>
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<pre style="margin: 0;"> <span id="LC1377" 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="LC1378" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC1379" 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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<pre style="margin: 0;">-<span id="LC1380" 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="LC1380" 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="LC1381" 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="LC1382" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1383" 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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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f0789d995cd92304f8ddcbfba90da5b75f83754d#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">@@ -542,7 +542,7 @@ mk_strict_superclasses rec_clss (CtGiven { ctev_evar = evar, ctev_loc = loc })</td>
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<pre style="margin: 0;"> <span id="LC542" 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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<pre style="margin: 0;"> <span id="LC543" 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="LC544" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC545" 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="LC545" 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="LC546" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC547" 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="LC548" 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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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -566,10 +566,10 @@ solveOneFromTheOther ev_i ev_w</td>
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<pre style="margin: 0;"> <span id="LC566" 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="LC567" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC568" 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="LC569" 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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570
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<pre style="margin: 0;">-<span id="LC570" 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="LC569" 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="LC570" 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="LC571" 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="LC572" 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="LC572" 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="LC573" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC574" 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="LC575" 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">@@ -1071,6 +1071,8 @@ shortCutSolver dflags ev_w ev_i</td>
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<pre style="margin: 0;"> <span id="LC1071" 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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1072
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1072
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<pre style="margin: 0;"> <span id="LC1072" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- not. See Note [Shortcut solving]</span></span>
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<pre style="margin: 0;"> <span id="LC1073" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1074" 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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1075
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<pre style="margin: 0;">+<span id="LC1075" class="line" lang="haskell"></span>
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1076
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<pre style="margin: 0;"> <span id="LC1076" 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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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;">-- If IncoherentInstances is on then we cannot rely on coherence of proofs</span></span>
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1076
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1078
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<pre style="margin: 0;"> <span id="LC1078" 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">@@ -1079,6 +1081,7 @@ shortCutSolver dflags ev_w ev_i</td>
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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>
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1082
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<pre style="margin: 0;"> <span id="LC1082" 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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1081
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1083
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<pre style="margin: 0;"> <span id="LC1083" 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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1084
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<pre style="margin: 0;">+<span id="LC1084" class="line" lang="haskell"></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="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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1083
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1086
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<pre style="margin: 0;"> <span id="LC1086" 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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1084
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1087
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<pre style="margin: 0;"> <span id="LC1087" 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/-/commit/f0789d995cd92304f8ddcbfba90da5b75f83754d#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">@@ -2527,8 +2527,7 @@ emptyDictMap = emptyTcAppMap</td>
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<pre style="margin: 0;"> <span id="LC2527" class="line" lang="haskell"></span>
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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="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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2529
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2529
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<pre style="margin: 0;"> <span id="LC2529" 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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2530
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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="n" style="color: #333;">isCTupleClass</span> <span class="n" style="color: #333;">cls</span></span>
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2531
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<pre style="margin: 0;">-<span id="LC2531" 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="LC2530" 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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2532
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<pre style="margin: 0;"> <span id="LC2531" 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="LC2532" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2533" 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/-/commit/f0789d995cd92304f8ddcbfba90da5b75f83754d#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">@@ -54,6 +54,7 @@ import GHC.Core.Make ( nO_METHOD_BINDING_ERROR_ID )</td>
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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.Make</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.SimpleOpt</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.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="LC58" 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="LC59" 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="LC60" 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">@@ -1634,7 +1635,7 @@ tcMethods dfun_id clas tyvars dfun_ev_vars inst_tys</td>
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<pre style="margin: 0;"> <span id="LC1635" 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="LC1636" 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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<pre style="margin: 0;"> <span id="LC1637" 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="LC1637" 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="LC1638" 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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<pre style="margin: 0;"> <span id="LC1639" 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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<pre style="margin: 0;"> <span id="LC1640" 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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<pre style="margin: 0;"> <span id="LC1641" 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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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f0789d995cd92304f8ddcbfba90da5b75f83754d#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">@@ -1747,7 +1747,7 @@ pickCapturedPreds</td>
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1747
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<pre style="margin: 0;"> <span id="LC1747" 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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1748
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<pre style="margin: 0;"> <span id="LC1748" 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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1749
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1749
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<pre style="margin: 0;"> <span id="LC1749" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC1750" 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="LC1750" 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="LC1751" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1752" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1753" 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/-/commit/f0789d995cd92304f8ddcbfba90da5b75f83754d#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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<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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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="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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<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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<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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<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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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# NOINLINE a #-}</span></span>
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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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<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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<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="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/-/commit/f0789d995cd92304f8ddcbfba90da5b75f83754d#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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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f0789d995cd92304f8ddcbfba90da5b75f83754d#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">@@ -333,3 +333,7 @@ test('T18347', normal, compile, ['-dcore-lint -O'])</td>
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<pre style="margin: 0;"> <span id="LC333" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18355</span><span class="p">',</span> <span class="p">[</span> <span class="nv" style="color: #008080;">grep_errmsg</span><span class="p">(</span><span class="nv" style="color: #008080;">r</span><span class="p">'</span><span class="s1" style="color: #d14;">OneShot</span><span class="p">')</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-simpl -dsuppress-uniques</span><span class="p">'])</span></span>
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<pre style="margin: 0;"> <span id="LC334" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18399</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;">-dcore-lint -O</span><span class="p">'])</span></span>
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<pre style="margin: 0;"> <span id="LC335" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18589</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;">-dcore-lint -O</span><span class="p">'])</span></span>
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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="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="LC338" 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>
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<pre style="margin: 0;">+<span id="LC339" class="line" lang="perl"></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f0789d995cd92304f8ddcbfba90da5b75f83754d#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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<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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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"></span>
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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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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"></span>
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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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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/-/commit/f0789d995cd92304f8ddcbfba90da5b75f83754d#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/-/commit/f0789d995cd92304f8ddcbfba90da5b75f83754d#8db0e99055bd439c988ea726deb76570d8736a55"><strong>testsuite/tests/typecheck/should_run/all.T</strong></a>
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<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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<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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