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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:
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<ul>
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2292eeab80ac065ac33c155908b7883898f98be9">2292eeab</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-09-09T10:28:57+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Care with implicit-parameter superclasses
Two bugs, #18627 and #18649, had the same cause: we were not
account for the fact that a constaint tuple might hide an implicit
parameter.
The solution is not hard: look for implicit parameters in
superclasses. See Note [Local implicit parameters] in
GHC.Core.Predicate.
Then we use this new function in two places
* The "short-cut solver" in GHC.Tc.Solver.Interact.shortCutSolver
which simply didn't handle implicit parameters properly at all.
This fixes #18627
* The specialiser, which should not specialise on implicit parameters
This fixes #18649
There are some lingering worries (see Note [Local implicit
parameters]) but things are much better.
</pre>
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<h4>12 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="#54436e21ea530a66a8a71bcc01c836f4740b8f02">
compiler/GHC/Tc/Solver.hs
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<li class="file-stats">
<a href="#f639b0b31b7245cb7d34ac190b798f5ec1c7da2e">
compiler/GHC/Tc/Solver/Interact.hs
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<li class="file-stats">
<a href="#0c6b585a8a21f8340a85ca2cef89c4b1bf5a8953">
compiler/GHC/Tc/Solver/Monad.hs
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<li class="file-stats">
<a href="#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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<li class="file-stats">
<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/2292eeab80ac065ac33c155908b7883898f98be9#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="2510" 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">@@ -2510,9 +2510,12 @@ mkCallUDs' env f args</td>
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<pre style="margin: 0;"> <span id="LC2510" 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="LC2511" 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="LC2512" 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="LC2513" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">type_determines_value</span> <span class="p">(</span><span class="n" style="color: #333;">scaledThing</span> <span class="n" style="color: #333;">pred</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC2514" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">interestingDict</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">arg</span> <span class="c1" style="color: #998; font-style: italic;">-- Note [Interesting dictionary arguments]</span></span>
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<pre style="margin: 0;">+<span id="LC2513" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isIPLikePred</span> <span class="p">(</span><span class="n" style="color: #333;">scaledThing</span> <span class="n" style="color: #333;">pred</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC2514" 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="LC2515" 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="LC2516" 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="LC2517" 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="LC2518" class="line" lang="haskell"></span>
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<td class="diff-line-num new_line" data-linenumber="2519" 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="LC2519" 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="LC2520" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2521" 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="2528" 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">@@ -2525,41 +2528,18 @@ mkCallUDs' env f args</td>
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<pre style="margin: 0;"> <span id="LC2528" 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="LC2529" 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="LC2530" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2528" 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="LC2529" 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="LC2530" 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="LC2531" 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="LC2532" 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="LC2533" 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="LC2534" 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="LC2535" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2536" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</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;">Note [Type determines value]</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;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~</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;">Only specialise on non-IP *class* params, because these are the ones</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;">whose *type* determines their *value*. In particular, with implicit</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;">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="LC2542" 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="LC2531" 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="LC2532" 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="LC2533" 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="LC2534" 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="LC2535" 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="LC2536" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">implicit param is! See #7101.</span></span>
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<pre style="margin: 0;"> <span id="LC2537" class="line" lang="haskell"></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;">So we treat implicit params just like ordinary arguments for the</span></span>
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2545
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2539
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<pre style="margin: 0;"> <span id="LC2539" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">purposes of specialisation. Note that we still want to specialise</span></span>
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2546
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2540
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<pre style="margin: 0;"> <span id="LC2540" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">functions with implicit params if they have *other* dicts which are</span></span>
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2547
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2541
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<pre style="margin: 0;"> <span id="LC2541" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">class params; see #17930.</span></span>
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2542
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<pre style="margin: 0;"> <span id="LC2542" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2549" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">One apparent additional complexity involves type families. For</span></span>
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2550
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<pre style="margin: 0;">-<span id="LC2550" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">example, consider</span></span>
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2551
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<pre style="margin: 0;">-<span id="LC2551" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type family D (v::*->*) :: Constraint</span></span>
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2552
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<pre style="margin: 0;">-<span id="LC2552" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type instance D [] = ()</span></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;"> f :: D v => v Char -> Int</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;">If we see a call (f "foo"), we'll pass a "dictionary"</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;"> () |> (g :: () ~ D [])</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;">and it's good to specialise f at this dictionary.</span></span>
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2557
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<pre style="margin: 0;">-<span id="LC2557" class="line" lang="haskell"></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;">So the question is: can an implicit parameter "hide inside" a</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;">type-family constraint like (D a). Well, no. We don't allow</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;"> type instance D Maybe = ?x:Int</span></span>
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2561
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<pre style="margin: 0;">-<span id="LC2561" 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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2562
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<pre style="margin: 0;">-<span id="LC2562" class="line" lang="haskell"></span>
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2543
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<pre style="margin: 0;"> <span id="LC2543" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Interesting dictionary arguments]</span></span>
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2564
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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;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</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;">Consider this</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2292eeab80ac065ac33c155908b7883898f98be9#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">@@ -22,7 +22,7 @@ module GHC.Core.Predicate (</td>
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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>
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<pre style="margin: 0;"> <span id="LC24" 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="LC25" 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="LC26" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Evidence variables</span></span>
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<pre style="margin: 0;"> <span id="LC28" 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 +39,10 @@ import GHC.Core.Multiplicity ( scaledThing )</td>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Builtin.Names</span></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="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="LC42" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Outputable</span></span>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Misc</span></span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Panic</span></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="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="LC46" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="haskell"><span class="cd">-- | A predicate in the solver. The solver tries to prove Wanted predicates</span></span>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- from Given ones.</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -170,7 +168,7 @@ isEqPredClass :: Class -> Bool</td>
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<pre style="margin: 0;"> <span id="LC168" 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="LC169" 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="LC170" 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="LC171" 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="LC172" 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="LC173" 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="LC174" 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 +184,15 @@ isEqPred ty -- True of (a ~ b) and (a ~~ b)</td>
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<pre style="margin: 0;"> <span id="LC184" 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="LC185" 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="LC186" 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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<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="LC187" 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="LC188" 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="LC189" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC191" 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="LC192" 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="LC193" 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="LC194" 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="LC195" 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="LC196" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC197" 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="LC198" 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 +201,105 @@ isIPTyCon tc = tc `hasKey` ipClassKey</td>
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<pre style="margin: 0;"> <span id="LC201" 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="LC202" 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="LC203" 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="LC204" 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="LC205" 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="LC206" 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="LC207" 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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208
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<pre style="margin: 0;"> <span id="LC208" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="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="LC209" 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="LC210" 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="LC211" 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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212
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<pre style="margin: 0;">+<span id="LC212" 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="LC213" 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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214
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<pre style="margin: 0;">+<span id="LC214" 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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215
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<pre style="margin: 0;">+<span id="LC215" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">cls</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tyConClass_maybe</span> <span class="n" style="color: #333;">tc</span></span>
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<pre style="margin: 0;">+<span id="LC216" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isIPClass</span> <span class="n" style="color: #333;">cls</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">has_ip_super_classes</span> <span class="n" style="color: #333;">rec_clss'</span> <span class="n" style="color: #333;">cls</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;">+<span id="LC217" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC218" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<pre style="margin: 0;">+<span id="LC219" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="c1" style="color: #998; font-style: italic;">-- Includes things like (D []) where D is</span></span>
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<pre style="margin: 0;">+<span id="LC220" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- a Constraint-ranged family; #7785</span></span>
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<pre style="margin: 0;">+<span id="LC221" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC222" 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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<pre style="margin: 0;">+<span id="LC223" 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="LC224" 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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<pre style="margin: 0;">+<span id="LC225" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC226" 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="LC227" 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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<pre style="margin: 0;">+<span id="LC228" 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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<pre style="margin: 0;">+<span id="LC229" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC230" 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="LC231" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- sc_sel_id :: forall a b. C a b -> <superclass type></span></span>
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<pre style="margin: 0;">+<span id="LC232" 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;">$</span></span>
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<pre style="margin: 0;">+<span id="LC233" class="line" lang="haskell"> <span class="n" style="color: #333;">funResultTy</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC234" 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;">sc_sel_id</span><span class="p">)</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;">+<span id="LC235" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC236" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC237" class="line" lang="haskell"><span class="n" style="color: #333;">initIPRecTc</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">RecTcChecker</span></span>
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<pre style="margin: 0;">+<span id="LC238" 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="LC239" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC240" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Local implicit parameters]</span></span>
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<pre style="margin: 0;">+<span id="LC241" 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="LC242" 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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<pre style="margin: 0;">+<span id="LC243" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">superclasses, is an implicit parameter.</span></span>
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<pre style="margin: 0;">+<span id="LC244" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC245" 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="LC246" 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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247
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<pre style="margin: 0;">+<span id="LC247" 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="LC248" 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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249
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<pre style="margin: 0;">+<span id="LC249" 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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250
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<pre style="margin: 0;">+<span id="LC250" 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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251
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<pre style="margin: 0;">+<span id="LC251" 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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252
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<pre style="margin: 0;">+<span id="LC252" class="line" lang="haskell"></span>
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253
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<pre style="margin: 0;">+<span id="LC253" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Several wrinkles</span></span>
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254
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<pre style="margin: 0;">+<span id="LC254" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC255" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* We must be careful with superclasses, as #18649 showed. Haskell</span></span>
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256
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<pre style="margin: 0;">+<span id="LC256" 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="LC257" 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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258
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<pre style="margin: 0;">+<span id="LC258" 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="LC259" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (% Eq a, ?x::Int %)</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;"> and /its/ superclasses, namely (Eq a) and (?x::Int), /do/ include an</span></span>
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261
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<pre style="margin: 0;">+<span id="LC261" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> implicit parameter.</span></span>
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<pre style="margin: 0;">+<span id="LC262" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC263" 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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264
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<pre style="margin: 0;">+<span id="LC264" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> class sc => C sc where ...</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;"> Then (C (?x::Int)) has (?x::Int) as a superclass. So we must</span></span>
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266
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<pre style="margin: 0;">+<span id="LC266" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instantiate and check each superclass, one by one, in</span></span>
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267
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<pre style="margin: 0;">+<span id="LC267" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> hasIPSuperClasses.</span></span>
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268
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<pre style="margin: 0;">+<span id="LC268" class="line" lang="haskell"></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;">* With -XRecursiveSuperClasses, the superclass hunt can go on forever,</span></span>
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270
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<pre style="margin: 0;">+<span id="LC270" 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="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;">* Another apparent additional complexity involves type families. For</span></span>
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273
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<pre style="margin: 0;">+<span id="LC273" 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="LC274" 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="LC275" 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="LC276" 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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277
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<pre style="margin: 0;">+<span id="LC277" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> If we see a call (f "foo"), we'll pass a "dictionary"</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;"> () |> (g :: () ~ D [])</span></span>
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279
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<pre style="margin: 0;">+<span id="LC279" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> and it's good to specialise f at this dictionary.</span></span>
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<pre style="margin: 0;">+<span id="LC280" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC281" 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="LC282" 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="LC283" 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="LC284" 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="LC285" class="line" lang="haskell"></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;">Small worries (Sept 20):</span></span>
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<pre style="margin: 0;">+<span id="LC287" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* 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="LC288" 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="LC289" 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="LC290" 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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291
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<pre style="margin: 0;">+<span id="LC291" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> matters in the cases for which isIPLikePred is used, and it's pretty</span></span>
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292
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<pre style="margin: 0;">+<span id="LC292" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> obscure anyway.</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;">* The superclass hunt stops when it encounters the same class again,</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;"> but in principle we could have the same class, differently instantiated,</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;"> and the second time it could have an implicit parameter</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;">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="LC297" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC298" 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="LC299" 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="LC300" 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="LC301" 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="LC302" 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="LC303" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC304" 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="LC305" 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/2292eeab80ac065ac33c155908b7883898f98be9#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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1377
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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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1380
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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/2292eeab80ac065ac33c155908b7883898f98be9#f639b0b31b7245cb7d34ac190b798f5ec1c7da2e"><strong>compiler/GHC/Tc/Solver/Interact.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -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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<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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<pre style="margin: 0;">+<span id="LC1075" class="line" lang="haskell"></span>
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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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<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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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/2292eeab80ac065ac33c155908b7883898f98be9#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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<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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<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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2533
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2532
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<pre style="margin: 0;"> <span id="LC2532" class="line" lang="haskell"></span>
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2534
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2533
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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/2292eeab80ac065ac33c155908b7883898f98be9#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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83
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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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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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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/2292eeab80ac065ac33c155908b7883898f98be9#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="LC20" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"><span class="n" style="color: #333;">topEntity</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"><span class="n" style="color: #333;">topEntity</span> <span class="n" style="color: #333;">ena</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">let</span> <span class="o" style="font-weight: 600;">?</span><span class="n" style="color: #333;">enable</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ena</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="n" style="color: #333;">system</span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"><span class="n" style="color: #333;">someVar</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">let</span> <span class="o" style="font-weight: 600;">?</span><span class="n" style="color: #333;">enable</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span> <span class="n" style="color: #333;">system</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2292eeab80ac065ac33c155908b7883898f98be9#fb99e471747eafcf334c714ee478740a4b9f4198"><strong>testsuite/tests/simplCore/should_compile/T18649.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">==================== Tidy Core rules ====================</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2292eeab80ac065ac33c155908b7883898f98be9#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;"># T18648 should /not/ generate a specialisation rule</span></span>
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338
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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/2292eeab80ac065ac33c155908b7883898f98be9#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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5
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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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<td class="diff-line-num new new_line" data-linenumber="9" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
9
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"> <span class="n" style="color: #333;">ip</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">21</span></span>
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10
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"></span>
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11
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="n" style="color: #333;">baz</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="o" style="font-weight: 600;">?</span><span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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12
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="n" style="color: #333;">baz</span> <span class="o" style="font-weight: 600;">=</span> <span class="o" style="font-weight: 600;">?</span><span class="n" style="color: #333;">x</span></span>
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13
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"></span>
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14
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="n" style="color: #333;">main</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<td class="diff-line-num new new_line" data-linenumber="15" 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">
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/2292eeab80ac065ac33c155908b7883898f98be9#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/2292eeab80ac065ac33c155908b7883898f98be9#8db0e99055bd439c988ea726deb76570d8736a55"><strong>testsuite/tests/typecheck/should_run/all.T</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="146" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="146" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -146,3 +146,4 @@ test('UnliftedNewtypesDependentFamilyRun', normal, compile_and_run, [''])</td>
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146
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146
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<pre style="margin: 0;"> <span id="LC146" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">UnliftedNewtypesIdentityRun</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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147
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147
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<pre style="margin: 0;"> <span id="LC147" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">UnliftedNewtypesCoerceRun</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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148
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<pre style="margin: 0;"> <span id="LC148" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17104</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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<td class="diff-line-num new new_line" data-linenumber="149" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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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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