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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/dc5f004c4dc27d78d3415adc54e9b6694b865145">dc5f004c</a></strong>
<div>
<span>by Xavier Denis</span>
<i>at 2020-05-28T16:24:37-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #18071
Run the core linter on candidate instances to ensure they are
well-kinded.
Better handle quantified constraints by using a CtWanted to avoid
having unsolved constraints thrown away at the end by the solver.
</pre>
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<h4>5 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="#80d443b8a7da0bff38040f4d6507ac48ac2ec40a">
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+
testsuite/tests/ghci/T18071/T18071.hs
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<a href="#4b303c6602551b7637cae8957eef02fc88c2643b">
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testsuite/tests/ghci/T18071/T18071.script
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testsuite/tests/ghci/T18071/T18071.stdout
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testsuite/tests/ghci/T18071/all.T
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<h4>Changes:</h4>
<li id="173c7eb846a4e9b5fee79688a72cbf6a326e4e1e">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dc5f004c4dc27d78d3415adc54e9b6694b865145#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="64" 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">@@ -64,6 +64,7 @@ import GHC.Core.FamInstEnv ( FamInst )</td>
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<td class="diff-line-num old_line" data-linenumber="64" 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">
64
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<td class="diff-line-num new_line" data-linenumber="64" 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="LC64" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.FVs</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">orphNamesOfFamInst</span> <span class="p">)</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="65" 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="65" 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="LC65" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCon</span></span>
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<td class="diff-line-num old_line" data-linenumber="66" 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="66" 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="LC66" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Type</span> <span class="n" style="color: #333;">hiding</span><span class="p">(</span> <span class="n" style="color: #333;">typeKind</span> <span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="67" 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="LC67" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="k" style="font-weight: 600;">qualified</span> <span class="nn" style="color: #555;">GHC.Core.Type</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">Type</span></span>
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67
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<pre style="margin: 0;"> <span id="LC68" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.RepType</span></span>
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<pre style="margin: 0;"> <span id="LC69" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.TcType</span></span>
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<td class="diff-line-num new_line" data-linenumber="70" 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="LC70" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types.Constraint</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="115" 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="116" 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">@@ -115,16 +116,14 @@ import Unsafe.Coerce ( unsafeCoerce )</td>
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<pre style="margin: 0;"> <span id="LC116" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="116" 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="LC117" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Module</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">runTcInteractive</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcRnType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">loadUnqualIfaces</span> <span class="p">)</span></span>
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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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<pre style="margin: 0;">-<span id="LC118" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC119" class="line" lang="haskell"><span class="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 old_line" data-linenumber="120" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC120" class="line" lang="haskell"></span>
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<td class="diff-line-num old_line" data-linenumber="121" 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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<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;">solveWanteds</span><span class="p">)</span></span>
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<td class="diff-line-num old_line" data-linenumber="123" 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="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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<td class="diff-line-num old_line" data-linenumber="124" 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="123" 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.Tc.Types.Evidence</span></span>
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<td class="diff-line-num old_line" data-linenumber="125" 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="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="LC126" class="line" lang="haskell"></span>
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127
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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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<pre style="margin: 0;">+<span id="LC126" 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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128
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127
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<pre style="margin: 0;"> <span id="LC127" class="line" lang="haskell"></span>
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129
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128
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<pre style="margin: 0;"> <span id="LC128" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- -----------------------------------------------------------------------------</span></span>
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130
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129
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<pre style="margin: 0;"> <span id="LC129" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- running a statement interactively</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1056" 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="1055" 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">@@ -1056,6 +1055,7 @@ getInstancesForType ty = withSession $ \hsc_env -> do</td>
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1056
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1055
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<pre style="margin: 0;"> <span id="LC1055" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Bring class and instances from unqualified modules into scope, this fixes #16793.</span></span>
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1057
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1056
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<pre style="margin: 0;"> <span id="LC1056" class="line" lang="haskell"> <span class="n" style="color: #333;">loadUnqualIfaces</span> <span class="n" style="color: #333;">hsc_env</span> <span class="p">(</span><span class="n" style="color: #333;">hsc_IC</span> <span class="n" style="color: #333;">hsc_env</span><span class="p">)</span></span>
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1058
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1057
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<pre style="margin: 0;"> <span id="LC1057" class="line" lang="haskell"> <span class="n" style="color: #333;">matches</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">findMatchingInstances</span> <span class="n" style="color: #333;">ty</span></span>
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1058
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<pre style="margin: 0;">+<span id="LC1058" class="line" lang="haskell"></span>
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1059
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1059
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<pre style="margin: 0;"> <span id="LC1059" class="line" lang="haskell"> <span class="n" style="color: #333;">fmap</span> <span class="n" style="color: #333;">catMaybes</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">forM</span> <span class="n" style="color: #333;">matches</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">uncurry</span> <span class="n" style="color: #333;">checkForExistence</span></span>
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1060
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1060
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<pre style="margin: 0;"> <span id="LC1060" class="line" lang="haskell"></span>
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1061
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1061
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<pre style="margin: 0;"> <span id="LC1061" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Parse a type string and turn any holes into skolems</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1074" 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">@@ -1074,13 +1074,41 @@ getDictionaryBindings theta = do</td>
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1074
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1074
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<pre style="margin: 0;"> <span id="LC1074" 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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1075
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<pre style="margin: 0;"> <span id="LC1075" 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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1076
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<pre style="margin: 0;"> <span id="LC1076" 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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<pre style="margin: 0;">-<span id="LC1077" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">wCs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkSimpleWC</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CtDerived</span></span>
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1078
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<pre style="margin: 0;">-<span id="LC1078" class="line" lang="haskell"> <span class="p">{</span> <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>
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1079
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<pre style="margin: 0;">-<span id="LC1079" class="line" lang="haskell"> <span class="p">,</span> <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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1080
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<pre style="margin: 0;">-<span id="LC1080" class="line" lang="haskell"> <span class="p">}]</span></span>
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1077
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<pre style="margin: 0;">+<span id="LC1077" class="line" lang="haskell"></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;">-- Generate a wanted constraint here because at the end of constraint</span></span>
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<pre style="margin: 0;">+<span id="LC1079" 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="LC1080" 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="LC1081" 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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1082
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<pre style="margin: 0;">+<span id="LC1082" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">wCs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkSimpleWC</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <span class="p">{</span></span>
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1083
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<pre style="margin: 0;">+<span id="LC1083" 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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1084
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<pre style="margin: 0;">+<span id="LC1084" 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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1085
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<pre style="margin: 0;">+<span id="LC1085" 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="LC1086" 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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1087
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<pre style="margin: 0;">+<span id="LC1087" class="line" lang="haskell"> <span class="p">}]</span></span>
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1088
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<pre style="margin: 0;"> <span id="LC1088" class="line" lang="haskell"></span>
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1082
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1089
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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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1083
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1090
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<pre style="margin: 0;"> <span id="LC1090" class="line" lang="haskell"></span>
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1091
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<pre style="margin: 0;">+<span id="LC1091" 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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1092
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<pre style="margin: 0;">+<span id="LC1092" 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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1093
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<pre style="margin: 0;">+<span id="LC1093" class="line" lang="haskell"><span class="n" style="color: #333;">findMatchingInstances</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1094
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<pre style="margin: 0;">+<span id="LC1094" class="line" lang="haskell"> <span class="n" style="color: #333;">ies</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">InstEnvs</span> <span class="p">{</span><span class="n" style="color: #333;">ie_global</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ie_global</span><span class="p">,</span> <span class="n" style="color: #333;">ie_local</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ie_local</span><span class="p">})</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcGetInstEnvs</span></span>
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1095
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<pre style="margin: 0;">+<span id="LC1095" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">allClasses</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">instEnvClasses</span> <span class="n" style="color: #333;">ie_global</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">instEnvClasses</span> <span class="n" style="color: #333;">ie_local</span></span>
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1096
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<pre style="margin: 0;">+<span id="LC1096" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">concatMap</span> <span class="p">(</span><span class="n" style="color: #333;">try_cls</span> <span class="n" style="color: #333;">ies</span><span class="p">)</span> <span class="n" style="color: #333;">allClasses</span></span>
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1097
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<pre style="margin: 0;">+<span id="LC1097" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1098
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<pre style="margin: 0;">+<span id="LC1098" class="line" lang="haskell"> <span class="cm" style="color: #998; font-style: italic;">{- Check that a class instance is well-kinded.</span></span>
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1099
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<pre style="margin: 0;">+<span id="LC1099" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Since `:instances` only works for unary classes, we're looking for instances of kind</span></span>
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1100
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<pre style="margin: 0;">+<span id="LC1100" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> k -> Constraint where k is the type of the queried type.</span></span>
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1101
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<pre style="margin: 0;">+<span id="LC1101" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -}</span></span>
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1102
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<pre style="margin: 0;">+<span id="LC1102" class="line" lang="haskell"> <span class="n" style="color: #333;">try_cls</span> <span class="n" style="color: #333;">ies</span> <span class="n" style="color: #333;">cls</span></span>
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1103
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<pre style="margin: 0;">+<span id="LC1103" 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;">arg_kind</span><span class="p">,</span> <span class="n" style="color: #333;">res_kind</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">splitFunTy_maybe</span> <span class="p">(</span><span class="n" style="color: #333;">tyConKind</span> <span class="o" style="font-weight: 600;">$</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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1104
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<pre style="margin: 0;">+<span id="LC1104" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcIsConstraintKind</span> <span class="n" style="color: #333;">res_kind</span></span>
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1105
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<pre style="margin: 0;">+<span id="LC1105" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">typeKind</span> <span class="n" style="color: #333;">ty</span> <span class="p">`</span><span class="n" style="color: #333;">eqType</span><span class="p">`</span> <span class="n" style="color: #333;">arg_kind</span></span>
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1106
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<pre style="margin: 0;">+<span id="LC1106" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">matches</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupInstEnv</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="n" style="color: #333;">ies</span> <span class="n" style="color: #333;">cls</span> <span class="p">[</span><span class="n" style="color: #333;">ty</span><span class="p">]</span></span>
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1107
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<pre style="margin: 0;">+<span id="LC1107" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">matches</span></span>
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1108
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<pre style="margin: 0;">+<span id="LC1108" 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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1109
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<pre style="margin: 0;">+<span id="LC1109" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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1110
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<pre style="margin: 0;">+<span id="LC1110" class="line" lang="haskell"></span>
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1111
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<pre style="margin: 0;">+<span id="LC1111" class="line" lang="haskell"></span>
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1084
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1112
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<pre style="margin: 0;"> <span id="LC1112" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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1085
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1113
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<pre style="margin: 0;"> <span id="LC1113" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> When we've found an instance that a query matches against, we still need to</span></span>
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1086
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1114
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<pre style="margin: 0;"> <span id="LC1114" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> check that all the instance's constraints are satisfiable. checkForExistence</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">@@ -1105,19 +1133,28 @@ getDictionaryBindings theta = do</td>
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1133
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<pre style="margin: 0;"> <span id="LC1133" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1106
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1134
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<pre style="margin: 0;"> <span id="LC1134" class="line" lang="haskell"></span>
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1107
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1135
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<pre style="margin: 0;"> <span id="LC1135" class="line" lang="haskell"><span class="n" style="color: #333;">checkForExistence</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ClsInst</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">DFunInstType</span><span class="p">]</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;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">ClsInst</span><span class="p">)</span></span>
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1108
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<pre style="margin: 0;">-<span id="LC1108" class="line" lang="haskell"><span class="n" style="color: #333;">checkForExistence</span> <span class="n" style="color: #333;">res</span> <span class="n" style="color: #333;">mb_inst_tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1109
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<pre style="margin: 0;">-<span id="LC1109" 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;">res</span><span class="p">)</span> <span class="n" style="color: #333;">mb_inst_tys</span></span>
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1110
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<pre style="margin: 0;">-<span id="LC1110" class="line" lang="haskell"></span>
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1111
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<pre style="margin: 0;">-<span id="LC1111" 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;">forM</span> <span class="n" style="color: #333;">thetas</span> <span class="n" style="color: #333;">getDictionaryBindings</span></span>
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1136
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<pre style="margin: 0;">+<span id="LC1136" class="line" lang="haskell"><span class="n" style="color: #333;">checkForExistence</span> <span class="n" style="color: #333;">clsInst</span> <span class="n" style="color: #333;">mb_inst_tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1137
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<pre style="margin: 0;">+<span id="LC1137" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We want to force the solver to attempt to solve the constraints for clsInst.</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1138" 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">
1138
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<pre style="margin: 0;">+<span id="LC1138" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Usually, this isn't a problem since there should only be a single instance</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1139" 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">
1139
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<pre style="margin: 0;">+<span id="LC1139" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- for a type. However, when we have overlapping instances, the solver will give up</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1140" 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">
1140
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<pre style="margin: 0;">+<span id="LC1140" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- since it can't decide which instance to use. To get around this restriction, instead</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1141" 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">
1141
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<pre style="margin: 0;">+<span id="LC1141" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- of asking the solver to solve a constraint for clsInst, we ask it to solve the</span></span>
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1142
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<pre style="margin: 0;">+<span id="LC1142" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- thetas of clsInst.</span></span>
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1143
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<pre style="margin: 0;">+<span id="LC1143" 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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1144
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<pre style="margin: 0;">+<span id="LC1144" 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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1112
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1145
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<pre style="margin: 0;"> <span id="LC1145" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">residuals</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">second</span> <span class="n" style="color: #333;">evBindMapBinds</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">runTcS</span> <span class="p">(</span><span class="n" style="color: #333;">solveWanteds</span> <span class="p">(</span><span class="n" style="color: #333;">unionsWC</span> <span class="n" style="color: #333;">wanteds</span><span class="p">))</span></span>
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1113
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1146
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<pre style="margin: 0;"> <span id="LC1146" class="line" lang="haskell"></span>
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1114
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<pre style="margin: 0;">-<span id="LC1114" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">all_residual_constraints</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bagToList</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">wc_simple</span> <span class="n" style="color: #333;">residuals</span></span>
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1115
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<pre style="margin: 0;">-<span id="LC1115" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">preds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">ctPred</span> <span class="n" style="color: #333;">all_residual_constraints</span></span>
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1116
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<pre style="margin: 0;">-<span id="LC1116" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">all</span> <span class="n" style="color: #333;">isSatisfiablePred</span> <span class="n" style="color: #333;">preds</span> <span class="o" style="font-weight: 600;">&&</span> <span class="p">(</span><span class="n" style="color: #333;">null</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">wc_impl</span> <span class="n" style="color: #333;">residuals</span><span class="p">)</span></span>
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1117
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<pre style="margin: 0;">-<span id="LC1117" 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="n" style="color: #333;">preds</span> <span class="n" style="color: #333;">res</span></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;">let</span> <span class="kt" style="color: #458; font-weight: 600;">WC</span> <span class="p">{</span> <span class="n" style="color: #333;">wc_simple</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">simples</span><span class="p">,</span> <span class="n" style="color: #333;">wc_impl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">impls</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">dropDerivedWC</span> <span class="n" style="color: #333;">residuals</span><span class="p">)</span></span>
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1148
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<pre style="margin: 0;">+<span id="LC1148" class="line" lang="haskell"></span>
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1149
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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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1150
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<pre style="margin: 0;">+<span id="LC1150" class="line" lang="haskell"></span>
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1151
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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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1152
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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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1118
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1153
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<pre style="margin: 0;"> <span id="LC1153" 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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1119
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1154
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<pre style="margin: 0;"> <span id="LC1154" class="line" lang="haskell"></span>
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1120
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1155
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<pre style="margin: 0;"> <span id="LC1155" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1156
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<pre style="margin: 0;">+<span id="LC1156" 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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1157
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<pre style="margin: 0;">+<span id="LC1157" 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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1121
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1158
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<pre style="margin: 0;"> <span id="LC1158" class="line" lang="haskell"></span>
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1122
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1159
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<pre style="margin: 0;"> <span id="LC1159" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Stricter version of isTyVarClassPred that requires all TyConApps to have at least</span></span>
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1123
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1160
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<pre style="margin: 0;"> <span id="LC1160" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- one argument or for the head to be a TyVar. The reason is that we want to ensure</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1129" 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="1166" 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">@@ -1129,7 +1166,7 @@ checkForExistence res mb_inst_tys = do</td>
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1129
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1166
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<pre style="margin: 0;"> <span id="LC1166" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">tys</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="o" style="font-weight: 600;">:</span><span class="kr" style="font-weight: 600;">_</span><span class="p">))</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">all</span> <span class="n" style="color: #333;">isTyVarTy</span> <span class="n" style="color: #333;">tys</span></span>
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1130
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1167
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<pre style="margin: 0;"> <span id="LC1167" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">isTyVarTy</span> <span class="n" style="color: #333;">ty</span></span>
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1131
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1168
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<pre style="margin: 0;"> <span id="LC1168" class="line" lang="haskell"></span>
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1132
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<pre style="margin: 0;">-<span id="LC1132" class="line" lang="haskell"> <span class="n" style="color: #333;">empty_subst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkEmptyTCvSubst</span> <span class="p">(</span><span class="n" style="color: #333;">mkInScopeSet</span> <span class="p">(</span><span class="n" style="color: #333;">tyCoVarsOfType</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">is_dfun</span> <span class="n" style="color: #333;"><span class="idiff left right">res</span></span><span class="p">)))</span></span>
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1169
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<pre style="margin: 0;">+<span id="LC1169" class="line" lang="haskell"> <span class="n" style="color: #333;">empty_subst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkEmptyTCvSubst</span> <span class="p">(</span><span class="n" style="color: #333;">mkInScopeSet</span> <span class="p">(</span><span class="n" style="color: #333;">tyCoVarsOfType</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">is_dfun</span> <span class="n" style="color: #333;"><span class="idiff left right">clsInst</span></span><span class="p">)))</span></span>
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1133
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1170
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<pre style="margin: 0;"> <span id="LC1170" class="line" lang="haskell"></span>
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1134
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1171
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<pre style="margin: 0;"> <span id="LC1171" class="line" lang="haskell"> <span class="cm" style="color: #998; font-style: italic;">{- Create a ClsInst with instantiated arguments and constraints.</span></span>
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1135
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1172
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<pre style="margin: 0;"> <span id="LC1172" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1186" 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">@@ -1149,16 +1186,6 @@ checkForExistence res mb_inst_tys = do</td>
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1149
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1186
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<pre style="margin: 0;"> <span id="LC1186" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1150
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1187
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<pre style="margin: 0;"> <span id="LC1187" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">dfun_tvs</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">cls</span><span class="p">,</span> <span class="n" style="color: #333;">args</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">instanceSig</span> <span class="n" style="color: #333;">inst</span></span>
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1151
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1188
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<pre style="margin: 0;"> <span id="LC1188" class="line" lang="haskell"></span>
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1152
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<pre style="margin: 0;">-<span id="LC1152" 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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1153
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<pre style="margin: 0;">-<span id="LC1153" 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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1154
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<pre style="margin: 0;">-<span id="LC1154" class="line" lang="haskell"><span class="n" style="color: #333;">findMatchingInstances</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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1155
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<pre style="margin: 0;">-<span id="LC1155" class="line" lang="haskell"> <span class="n" style="color: #333;">ies</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">InstEnvs</span> <span class="p">{</span><span class="n" style="color: #333;">ie_global</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ie_global</span><span class="p">,</span> <span class="n" style="color: #333;">ie_local</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ie_local</span><span class="p">})</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcGetInstEnvs</span></span>
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1156
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<pre style="margin: 0;">-<span id="LC1156" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">allClasses</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">instEnvClasses</span> <span class="n" style="color: #333;">ie_global</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">instEnvClasses</span> <span class="n" style="color: #333;">ie_local</span></span>
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1157
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<pre style="margin: 0;">-<span id="LC1157" class="line" lang="haskell"></span>
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1158
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<pre style="margin: 0;">-<span id="LC1158" class="line" lang="haskell"> <span class="n" style="color: #333;">concatMapM</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">cls</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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1159
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<pre style="margin: 0;">-<span id="LC1159" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">matches</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lookupInstEnv</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="n" style="color: #333;">ies</span> <span class="n" style="color: #333;">cls</span> <span class="p">[</span><span class="n" style="color: #333;">ty</span><span class="p">]</span></span>
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1160
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<pre style="margin: 0;">-<span id="LC1160" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">matches</span><span class="p">)</span> <span class="n" style="color: #333;">allClasses</span></span>
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1161
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<pre style="margin: 0;">-<span id="LC1161" class="line" lang="haskell"></span>
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1162
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1189
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<pre style="margin: 0;"> <span id="LC1189" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-----------------------------------------------------------------------------</span></span>
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1163
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1190
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<pre style="margin: 0;"> <span id="LC1190" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Compile an expression, run it, and deliver the result</span></span>
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1164
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1191
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<pre style="margin: 0;"> <span id="LC1191" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dc5f004c4dc27d78d3415adc54e9b6694b865145#80d443b8a7da0bff38040f4d6507ac48ac2ec40a"><strong>testsuite/tests/ghci/T18071/T18071.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 FlexibleInstances #-}</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 PolyKinds #-}</span></span>
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3
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE QuantifiedConstraints #-}</span></span>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE UndecidableInstances #-}</span></span>
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5
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE FlexibleContexts #-}</span></span>
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6
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<pre style="margin: 0;">+<span id="LC6" 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="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">Bug</span> <span class="kr" style="font-weight: 600;">where</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;">import</span> <span class="nn" style="color: #555;">Data.Kind</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Proxy</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">MyShow</span> <span class="n" style="color: #333;">a</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"> <span class="n" style="color: #333;">show</span> <span class="o" style="font-weight: 600;">::</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;">String</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="p">(</span><span class="n" style="color: #333;">forall</span> <span class="p">(</span><span class="n" style="color: #333;">z</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">k</span><span class="p">)</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">MyShow</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Proxy</span> <span class="n" style="color: #333;">z</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">MyShowProxy</span> <span class="p">(</span><span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="p">(</span><span class="n" style="color: #333;">forall</span> <span class="p">(</span><span class="n" style="color: #333;">z</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">k</span><span class="p">)</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">MyShow</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Proxy</span> <span class="n" style="color: #333;">z</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">MyShowProxy</span> <span class="p">(</span><span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span></span>
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17
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">T</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;">Type</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">U</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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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="n" style="color: #333;">forall</span> <span class="p">(</span><span class="n" style="color: #333;">z</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">U</span><span class="p">)</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">MyShow</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Proxy</span> <span class="p">(</span><span class="n" style="color: #333;">z</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">U</span><span class="p">))</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"> <span class="n" style="color: #333;">show</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="s" style="color: #d14;">"U"</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="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">U2</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">A2</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">B2</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="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">MyShow</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Proxy</span> <span class="kt" style="color: #458; font-weight: 600;">A2</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"> <span class="n" style="color: #333;">show</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="s" style="color: #d14;">"A2"</span></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">MyShow</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Proxy</span> <span class="kt" style="color: #458; font-weight: 600;">B2</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"> <span class="n" style="color: #333;">show</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="s" style="color: #d14;">"B2"</span></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"></span></pre>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">:set -Wno-simplifiable-class-constraints</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">:load T18071.hs</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext">-- Should report no instances since it is ill-kinded for T</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext">:instances T</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext">-- U should report a match for ShowProxy</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext">:instances U</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext">-- U2 should not report a match for ShowProxy</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext">:instances U2</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dc5f004c4dc27d78d3415adc54e9b6694b865145#6f47268b91ee1fe4d3cb453d07b2368c89427281"><strong>testsuite/tests/ghci/T18071/T18071.stdout</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">instance [safe] MyShowProxy U -- Defined at T18071.hs:16:10</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dc5f004c4dc27d78d3415adc54e9b6694b865145#0b9e8b683996a45db2ae94a778902473228a3723"><strong>testsuite/tests/ghci/T18071/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;">T18071</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;">T18071.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;">T18071.script</span><span class="p">'])</span></span></pre>
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