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<h3>
Marge Bot pushed to branch master
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a2a9006b068ba9af9d41711307a8d597d2bb03d7">a2a9006b</a></strong>
<div>
<span>by Xavier Denis</span>
<i>at 2020-06-23T22:48:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix issue #18262 by zonking constraints after solving
Zonk residual constraints in checkForExistence to reveal user type
errors.
Previously when `:instances` was used with instances that have TypeError
constraints the result would look something like:
instance [safe] s0 => Err 'A -- Defined at ../Bug2.hs:8:10
whereas after zonking, `:instances` now sees the `TypeError` and
properly eliminates the constraint from the results.
</pre>
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<h4>6 changed files:</h4>
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<li class="file-stats">
<a href="#173c7eb846a4e9b5fee79688a72cbf6a326e4e1e">
compiler/GHC/Runtime/Eval.hs
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<a href="#b02c1c6109c60b8f685234b0dbaabf6c79fed2a2">
docs/users_guide/ghci.rst
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<a href="#af99879104ce011abb94f023987f8a2416a5e73b">
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+
testsuite/tests/ghci/T18262/T18262.hs
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<a href="#bc783f8d4fc0eaa8349748c02a01f18f33dedf52">
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+
testsuite/tests/ghci/T18262/T18262.script
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testsuite/tests/ghci/T18262/T18262.stdout
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<a href="#32b919b9b2880d6e6eccfec5a3800c8de52b0950">
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testsuite/tests/ghci/T18262/all.T
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<h4>Changes:</h4>
<li id="173c7eb846a4e9b5fee79688a72cbf6a326e4e1e">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a2a9006b068ba9af9d41711307a8d597d2bb03d7#173c7eb846a4e9b5fee79688a72cbf6a326e4e1e"><strong>compiler/GHC/Runtime/Eval.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="118" 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">@@ -118,11 +118,8 @@ import GHC.Tc.Module ( runTcInteractive, tcRnType, loadUnqualIfaces )</td>
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118
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<pre style="margin: 0;"> <span id="LC118" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Zonk</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">ZonkFlexi</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SkolemiseFlexi</span><span class="p">)</span> <span class="p">)</span></span>
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<td class="diff-line-num old_line" data-linenumber="119" 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="LC119" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Env</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">tcGetInstEnvs</span><span class="p">)</span></span>
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<td class="diff-line-num old_line" data-linenumber="120" 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="LC120" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Instantiate</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">instDFunType</span><span class="p">)</span></span>
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121
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<pre style="margin: 0;">-<span id="LC121" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Solver</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">s<span class="idiff left right">olveWanteds</span></span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC121" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Solver</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">s<span class="idiff left right">implifyWantedsTcM</span></span><span class="p">)</span></span>
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122
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<pre style="margin: 0;"> <span id="LC122" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Monad</span></span>
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<pre style="margin: 0;">-<span id="LC123" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types.Evidence</span></span>
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<pre style="margin: 0;">-<span id="LC124" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Bifunctor</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">second</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC125" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Solver.Monad</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">runTcS</span><span class="p">)</span></span>
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<td class="diff-line-num old_line" data-linenumber="126" 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="LC123" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Class</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">classTyCon</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC124" class="line" lang="haskell"></span>
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<td class="diff-line-num old_line" data-linenumber="128" 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="LC125" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- -----------------------------------------------------------------------------</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1069" 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="1066" 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">@@ -1069,24 +1066,22 @@ parseInstanceHead str = withSession $ \hsc_env0 -> do</td>
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1069
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1066
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<pre style="margin: 0;"> <span id="LC1066" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">ty</span></span>
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<td class="diff-line-num old_line" data-linenumber="1070" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<td class="diff-line-num new_line" data-linenumber="1067" 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="LC1067" class="line" lang="haskell"></span>
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<td class="diff-line-num new_line" data-linenumber="1068" 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="LC1068" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Get all the constraints required of a dictionary binding</span></span>
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1072
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<pre style="margin: 0;">-<span id="LC1072" class="line" lang="haskell"><span class="n" style="color: #333;">getDictionaryBindings</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;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">WantedConstraints</span></span></span>
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<pre style="margin: 0;">+<span id="LC1069" class="line" lang="haskell"><span class="n" style="color: #333;">getDictionaryBindings</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;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CtEvidence</span></span></span>
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<pre style="margin: 0;"> <span id="LC1070" class="line" lang="haskell"><span class="n" style="color: #333;">getDictionaryBindings</span> <span class="n" style="color: #333;">theta</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;"> <span id="LC1071" class="line" lang="haskell"> <span class="n" style="color: #333;">dictName</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newName</span> <span class="p">(</span><span class="n" style="color: #333;">mkDictOcc</span> <span class="p">(</span><span class="n" style="color: #333;">mkVarOcc</span> <span class="s" style="color: #d14;">"magic"</span><span class="p">))</span></span>
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1075
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<pre style="margin: 0;"> <span id="LC1072" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">dict_var</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkVanillaGlobal</span> <span class="n" style="color: #333;">dictName</span> <span class="n" style="color: #333;">theta</span></span>
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1076
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<pre style="margin: 0;"> <span id="LC1073" class="line" lang="haskell"> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getCtLocM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">GivenOrigin</span> <span class="kt" style="color: #458; font-weight: 600;">UnkSkol</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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1077
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1074
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<pre style="margin: 0;"> <span id="LC1074" class="line" lang="haskell"></span>
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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;">-- Generate a wanted <span class="idiff left right">constraint </span>here because at the end of constraint</span></span>
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<pre style="margin: 0;">+<span id="LC1075" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Generate a wanted here because at the end of constraint</span></span>
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<pre style="margin: 0;"> <span id="LC1076" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- solving, most derived constraints get thrown away, which in certain</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;">-- cases, notably with quantified constraints makes it impossible to rule</span></span>
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<pre style="margin: 0;"> <span id="LC1078" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- out instances as invalid. (See #18071)</span></span>
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<pre style="margin: 0;">-<span id="LC1082" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;"><span class="idiff left">let</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">wCs</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">mkSimpleWC</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">[</span></span><span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC1079" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">return</span></span><span class="idiff right"> </span><span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC1080" class="line" lang="haskell"> <span class="n" style="color: #333;">ctev_pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">varType</span> <span class="n" style="color: #333;">dict_var</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC1081" class="line" lang="haskell"> <span class="n" style="color: #333;">ctev_dest</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">EvVarDest</span> <span class="n" style="color: #333;">dict_var</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC1082" class="line" lang="haskell"> <span class="n" style="color: #333;">ctev_nosh</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">WDeriv</span><span class="p">,</span></span>
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1086
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<pre style="margin: 0;"> <span id="LC1083" class="line" lang="haskell"> <span class="n" style="color: #333;">ctev_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">loc</span></span>
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<pre style="margin: 0;">-<span id="LC1087" class="line" lang="haskell"> <span class="p">}]</span></span>
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<pre style="margin: 0;">-<span id="LC1088" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1089" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">wCs</span></span>
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<pre style="margin: 0;">+<span id="LC1084" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1085" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1086" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Find instances where the head unifies with the provided type</span></span>
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<pre style="margin: 0;"> <span id="LC1087" class="line" lang="haskell"><span class="n" style="color: #333;">findMatchingInstances</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;">TcM</span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">ClsInst</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">DFunInstType</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">@@ -1142,17 +1137,18 @@ checkForExistence clsInst mb_inst_tys = do</td>
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<pre style="margin: 0;"> <span id="LC1137" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- thetas of clsInst.</span></span>
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<pre style="margin: 0;"> <span id="LC1138" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">tys</span><span class="p">,</span> <span class="n" style="color: #333;">thetas</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">instDFunType</span> <span class="p">(</span><span class="n" style="color: #333;">is_dfun</span> <span class="n" style="color: #333;">clsInst</span><span class="p">)</span> <span class="n" style="color: #333;">mb_inst_tys</span></span>
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<pre style="margin: 0;"> <span id="LC1139" class="line" lang="haskell"> <span class="n" style="color: #333;">wanteds</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">getDictionaryBindings</span> <span class="n" style="color: #333;">thetas</span></span>
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<pre style="margin: 0;">-<span id="LC1145" class="line" lang="haskell"> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">residuals</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">second</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">evBindMapBinds</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><$></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">runTcS</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">solveWanteds</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">unionsWC</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">wanteds</span></span><span class="p"><span class="idiff right">))</span></span></span>
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<pre style="margin: 0;">-<span id="LC1146" class="line" lang="haskell"></span>
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1147
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<pre style="margin: 0;">-<span id="LC1147" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;"><span class="idiff left">let</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">WC</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">wc_simple</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">simples</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">wc_impl</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">impls</span></span><span class="idiff"> </span><span class="p"><span class="idiff">}</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">dropDerivedWC</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">residuals</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC1140" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">-- It's important to zonk constraints after solving in order to expose things like TypeErrors</span></span></span>
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<pre style="margin: 0;">+<span id="LC1141" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- which otherwise appear as opaque type variables. (See #18262).</span></span>
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<pre style="margin: 0;">+<span id="LC1142" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">WC</span></span><span class="idiff"> </span><span class="p"><span class="idiff">{</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">wc_simple</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">simples</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">wc_impl</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">impls</span></span><span class="idiff"> </span><span class="p"><span class="idiff">}</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><-</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">simplifyWantedsTcM</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">wanteds</span></span></span>
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<pre style="margin: 0;"> <span id="LC1143" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1149" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">resPreds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapBag</span> <span class="n" style="color: #333;">ctPred</span> <span class="n" style="color: #333;">simples</span></span>
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<pre style="margin: 0;">-<span id="LC1150" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1151" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">allBag</span> <span class="n" style="color: #333;">isSatisfiablePred</span> <span class="n" style="color: #333;">resPreds</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">solvedImplics</span> <span class="n" style="color: #333;">impls</span></span>
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<pre style="margin: 0;">-<span id="LC1152" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">substInstArgs</span> <span class="n" style="color: #333;">tys</span> <span class="p">(</span><span class="n" style="color: #333;">bagToList</span> <span class="n" style="color: #333;">resPreds</span><span class="p">)</span> <span class="n" style="color: #333;">clsInst</span></span>
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<pre style="margin: 0;">+<span id="LC1144" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">allBag</span> <span class="n" style="color: #333;">allowedSimple</span> <span class="n" style="color: #333;">simples</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">solvedImplics</span> <span class="n" style="color: #333;">impls</span></span>
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<pre style="margin: 0;">+<span id="LC1145" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">substInstArgs</span> <span class="n" style="color: #333;">tys</span> <span class="p">(</span><span class="n" style="color: #333;">bagToList</span> <span class="p">(</span><span class="n" style="color: #333;">mapBag</span> <span class="n" style="color: #333;">ctPred</span> <span class="n" style="color: #333;">simples</span><span class="p">))</span> <span class="n" style="color: #333;">clsInst</span></span>
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<pre style="margin: 0;"> <span id="LC1146" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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1154
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1147
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<pre style="margin: 0;"> <span id="LC1147" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1148" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC1149" class="line" lang="haskell"> <span class="n" style="color: #333;">allowedSimple</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</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="LC1150" class="line" lang="haskell"> <span class="n" style="color: #333;">allowedSimple</span> <span class="n" style="color: #333;">ct</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isSatisfiablePred</span> <span class="p">(</span><span class="n" style="color: #333;">ctPred</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span></span>
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1151
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<pre style="margin: 0;">+<span id="LC1151" class="line" lang="haskell"></span>
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1156
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<pre style="margin: 0;"> <span id="LC1152" class="line" lang="haskell"> <span class="n" style="color: #333;">solvedImplics</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bag</span> <span class="kt" style="color: #458; font-weight: 600;">Implication</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="LC1153" class="line" lang="haskell"> <span class="n" style="color: #333;">solvedImplics</span> <span class="n" style="color: #333;">impls</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">allBag</span> <span class="p">(</span><span class="n" style="color: #333;">isSolvedStatus</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">ic_status</span><span class="p">)</span> <span class="n" style="color: #333;">impls</span></span>
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1158
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<pre style="margin: 0;"> <span id="LC1154" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2518,6 +2518,25 @@ commonly used commands.</td>
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<pre style="margin: 0;"> <span id="LC2518" class="line" lang="plaintext"> instance Show _ => Show (Maybe _) -- Defined in ‘GHC.Show’</span>
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<pre style="margin: 0;"> <span id="LC2519" class="line" lang="plaintext"> instance Read _ => Read (Maybe _) -- Defined in ‘GHC.Read’</span>
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<pre style="margin: 0;"> <span id="LC2520" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC2521" class="line" lang="plaintext"> Only instances which could potentially be used will be displayed in the results.</span>
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<pre style="margin: 0;">+<span id="LC2522" class="line" lang="plaintext"> Instances which require unsatisfiable constraints such as ``TypeError`` will not be</span>
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<pre style="margin: 0;">+<span id="LC2523" class="line" lang="plaintext"> included. In the following example, the instance for ``A`` is not shown because it cannot</span>
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<pre style="margin: 0;">+<span id="LC2524" class="line" lang="plaintext"> be used.</span>
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<pre style="margin: 0;">+<span id="LC2525" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC2526" class="line" lang="plaintext"> .. code-block:: none</span>
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<pre style="margin: 0;">+<span id="LC2527" class="line" lang="plaintext"> ghci>:set -XDataKinds -XUndecidableInstances</span>
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<pre style="margin: 0;">+<span id="LC2528" class="line" lang="plaintext"> ghci>import GHC.TypeLits</span>
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<pre style="margin: 0;">+<span id="LC2529" class="line" lang="plaintext"> ghci>class A a</span>
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<pre style="margin: 0;">+<span id="LC2530" class="line" lang="plaintext"> ghci>instance (TypeError (Text "Not possible")) => A Bool</span>
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<pre style="margin: 0;">+<span id="LC2531" class="line" lang="plaintext"> ghci>:instances Bool</span>
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<pre style="margin: 0;">+<span id="LC2532" class="line" lang="plaintext"> instance Eq Bool -- Defined in ‘GHC.Classes’</span>
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<pre style="margin: 0;">+<span id="LC2533" class="line" lang="plaintext"> instance Ord Bool -- Defined in ‘GHC.Classes’</span>
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<pre style="margin: 0;">+<span id="LC2534" class="line" lang="plaintext"> instance Enum Bool -- Defined in ‘GHC.Enum’</span>
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<pre style="margin: 0;">+<span id="LC2535" class="line" lang="plaintext"> instance Show Bool -- Defined in ‘GHC.Show’</span>
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<pre style="margin: 0;">+<span id="LC2536" class="line" lang="plaintext"> instance Read Bool -- Defined in ‘GHC.Read’</span>
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<pre style="margin: 0;">+<span id="LC2537" class="line" lang="plaintext"> instance Bounded Bool -- Defined in ‘GHC.Enum’</span>
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<pre style="margin: 0;">+<span id="LC2538" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC2539" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC2540" class="line" lang="plaintext">.. ghci-cmd:: :issafe; [⟨module⟩]</span>
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<pre style="margin: 0;"> <span id="LC2541" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC2542" class="line" lang="plaintext"> Displays Safe Haskell information about the given module (or the</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a2a9006b068ba9af9d41711307a8d597d2bb03d7#af99879104ce011abb94f023987f8a2416a5e73b"><strong>testsuite/tests/ghci/T18262/T18262.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 TypeFamilies, FlexibleInstances, DataKinds, UndecidableInstances #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.TypeLits</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;">data</span> <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">A</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">B</span></span>
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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">Err</span> <span class="p">(</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;">C</span><span class="p">)</span></span>
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8
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"></span>
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9
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TypeError</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">'Text</span> <span class="s" style="color: #d14;">"uh-oh"</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Err</span> <span class="sc" style="color: #d14;">'A</span></span>
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10
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="err" style="color: #a61717; background-color: #e3d2d2;">i</span><span class="n" style="color: #333;">nstance</span> <span class="kt" style="color: #458; font-weight: 600;">Err</span> <span class="sc" style="color: #d14;">'B</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a2a9006b068ba9af9d41711307a8d597d2bb03d7#bc783f8d4fc0eaa8349748c02a01f18f33dedf52"><strong>testsuite/tests/ghci/T18262/T18262.script</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">:load T18262.hs</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">:set -XDataKinds</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext">-- Should report no instances</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext">:instances 'A</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext">-- Should report an instance with no constraints</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext">:instances 'B</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a2a9006b068ba9af9d41711307a8d597d2bb03d7#29c92ab3eeb914a8d94e70b5d875c6521c5cdb52"><strong>testsuite/tests/ghci/T18262/T18262.stdout</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">instance [safe] Err 'B -- Defined at T18262.hs:10:10</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a2a9006b068ba9af9d41711307a8d597d2bb03d7#32b919b9b2880d6e6eccfec5a3800c8de52b0950"><strong>testsuite/tests/ghci/T18262/all.T</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18262</span><span class="p">',</span> <span class="p">[</span><span class="nv" style="color: #008080;">extra_files</span><span class="p">(['</span><span class="s1" style="color: #d14;">T18262.hs</span><span class="p">'])],</span> <span class="nv" style="color: #008080;">ghci_script</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">T18262.script</span><span class="p">'])</span></span></pre>
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