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<h3>
Richard Eisenberg pushed to branch wip/derived-refactor
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/e8581f1bd8d30f355b18bb9459dd701f58582203">e8581f1b</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-06-20T22:14:24+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Checkpoint. About to never report WRW errors
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ef71e5ce9ddf894b51553d513e92bd043c012d5f">ef71e5ce</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-06-25T11:38:37+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Suppress errors using RewriterSet
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5d3804aec65f0801363c28ca3bb8a15f4ef3e6db">5d3804ae</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-06-25T14:13:43+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">More propagation of rewriters
</pre>
</li>
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<h4>16 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#039e8f5676356ef05c90af828aae48aac7296e47">
compiler/GHC/Core/TyCo/FVs.hs
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</li>
<li class="file-stats">
<a href="#578c7c3857d66d963736ff6742f3433a0e8d01b7">
compiler/GHC/Core/TyCo/Rep.hs
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<li class="file-stats">
<a href="#84c9d3ba34173297e7d7747e02caa2e004b164fc">
compiler/GHC/Core/Type.hs
</a>
</li>
<li class="file-stats">
<a href="#e4b9d5e9d2de37561bfd06a2c97a5c924a1bab76">
compiler/GHC/Tc/Errors.hs
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<li class="file-stats">
<a href="#9355bef855426caf5f526925edf351b20f9a86c4">
compiler/GHC/Tc/Gen/HsType.hs
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<li class="file-stats">
<a href="#54436e21ea530a66a8a71bcc01c836f4740b8f02">
compiler/GHC/Tc/Solver.hs
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<li class="file-stats">
<a href="#f018e77421f495c6f75733fee4a511cfe57bebe8">
compiler/GHC/Tc/Solver/Canonical.hs
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<li class="file-stats">
<a href="#81707f1fe21087531cefd70879aa09c2be5c1d22">
compiler/GHC/Tc/Solver/Flatten.hs
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<li class="file-stats">
<a href="#f639b0b31b7245cb7d34ac190b798f5ec1c7da2e">
compiler/GHC/Tc/Solver/Interact.hs
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<li class="file-stats">
<a href="#0c6b585a8a21f8340a85ca2cef89c4b1bf5a8953">
compiler/GHC/Tc/Solver/Monad.hs
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<li class="file-stats">
<a href="#3b6d78a50c8462304f843b952a88e531718dbbd2">
compiler/GHC/Tc/Types/Constraint.hs
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<li class="file-stats">
<a href="#94c96afe1bb3b771ffbcfeeca34ce43ebbe76ccb">
compiler/GHC/Tc/Utils/TcMType.hs
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<li class="file-stats">
<a href="#3f09f54f5246ba5ea580755fff657723a4077bea">
testsuite/tests/partial-sigs/should_fail/T10999.stderr
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<li class="file-stats">
<a href="#4c5de4968cdc95ac52e3a556a04a81ac8c2db89b">
testsuite/tests/typecheck/should_fail/T12785b.stderr
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</li>
<li class="file-stats">
<a href="#79d888b8ac34c7cc936b21885c2d61f40d3e8bf3">
testsuite/tests/typecheck/should_fail/T15648.stderr
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<li class="file-stats">
<a href="#b166026a124e4ed0cfeb367ad0745c803ab612ff">
testsuite/tests/typecheck/should_fail/T8450.stderr
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</ul>
<h4>Changes:</h4>
<li id="039e8f5676356ef05c90af828aae48aac7296e47">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/f5433f0bc06f65deb96a44b62d47875ec4bc5b38...5d3804aec65f0801363c28ca3bb8a15f4ef3e6db#039e8f5676356ef05c90af828aae48aac7296e47"><strong>compiler/GHC/Core/TyCo/FVs.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="266" 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="266" 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">@@ -266,9 +266,6 @@ runTyCoVars :: Endo TyCoVarSet -> TyCoVarSet</td>
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<td class="diff-line-num old_line" data-linenumber="266" 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="266" 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="LC266" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# INLINE runTyCoVars #-}</span></span>
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<td class="diff-line-num old_line" data-linenumber="267" 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="267" 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="LC267" class="line" lang="haskell"><span class="n" style="color: #333;">runTyCoVars</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">appEndo</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">emptyVarSet</span></span>
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<td class="diff-line-num old_line" data-linenumber="268" 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="268" 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="LC268" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="269" 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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<td class="diff-line-num new_line old" data-linenumber="269" 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="LC269" class="line" lang="haskell"><span class="n" style="color: #333;">noView</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span></span>
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<td class="diff-line-num old old_line" data-linenumber="270" 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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<td class="diff-line-num new_line old" data-linenumber="269" 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="LC270" class="line" lang="haskell"><span class="n" style="color: #333;">noView</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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<td class="diff-line-num old old_line" data-linenumber="271" 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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<td class="diff-line-num new_line old" data-linenumber="269" 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="LC271" class="line" lang="haskell"></span>
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<td class="diff-line-num old_line" data-linenumber="272" 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="269" 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="LC269" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *********************************************************************</span></span>
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<td class="diff-line-num old_line" data-linenumber="273" 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="270" 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="LC270" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<td class="diff-line-num old_line" data-linenumber="274" 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="271" 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="LC271" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Deep free variables</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="379" 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="376" 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">@@ -379,8 +376,8 @@ shallowTcvFolder = TyCoFolder { tcf_view = noView</td>
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<td class="diff-line-num new_line" data-linenumber="376" 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="LC376" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">********************************************************************* -}</span></span>
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<td class="diff-line-num new_line" data-linenumber="377" 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="LC377" class="line" lang="haskell"></span>
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<td class="diff-line-num old_line" data-linenumber="381" 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="378" 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="LC378" class="line" lang="haskell"></span>
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<td class="diff-line-num old old_line" data-linenumber="382" 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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<td class="diff-line-num new_line old" data-linenumber="379" 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="LC382" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Finding free coercion varibles]</span></span>
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<td class="diff-line-num old old_line" data-linenumber="383" 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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<td class="diff-line-num new_line old" data-linenumber="379" 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="LC383" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<td class="diff-line-num new old_line" data-linenumber="384" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="379" 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="LC379" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Finding free coercion vari<span class="idiff left right">a</span>bles]</span></span>
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<td class="diff-line-num new old_line" data-linenumber="384" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="380" 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="LC380" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<span class="idiff left right">~</span></span></span>
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<td class="diff-line-num old_line" data-linenumber="384" 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="LC381" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here we are only interested in the free /coercion/ variables.</span></span>
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385
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382
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<pre style="margin: 0;"> <span id="LC382" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We can achieve this through a slightly differnet TyCo folder.</span></span>
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386
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383
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<pre style="margin: 0;"> <span id="LC383" 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">@@ -389,6 +386,7 @@ Notice that we look deeply, into kinds.</td>
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389
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386
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<pre style="margin: 0;"> <span id="LC386" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See #14880.</span></span>
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390
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387
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<pre style="margin: 0;"> <span id="LC387" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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391
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388
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<pre style="margin: 0;"> <span id="LC388" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC389" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Finding free coercion variables]</span></span>
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392
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390
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<pre style="margin: 0;"> <span id="LC390" class="line" lang="haskell"><span class="n" style="color: #333;">coVarsOfType</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;">CoVarSet</span></span>
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393
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391
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<pre style="margin: 0;"> <span id="LC391" class="line" lang="haskell"><span class="n" style="color: #333;">coVarsOfTypes</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoVarSet</span></span>
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394
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392
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<pre style="margin: 0;"> <span id="LC392" class="line" lang="haskell"><span class="n" style="color: #333;">coVarsOfCo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoVarSet</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">@@ -429,7 +427,6 @@ deepCoVarFolder = TyCoFolder { tcf_view = noView</td>
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429
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427
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<pre style="margin: 0;"> <span id="LC427" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [CoercionHoles and coercion free variables]</span></span>
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430
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428
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<pre style="margin: 0;"> <span id="LC428" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in GHC.Core.TyCo.Rep</span></span>
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431
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429
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<pre style="margin: 0;"> <span id="LC429" class="line" lang="haskell"></span>
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432
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<pre style="margin: 0;">-<span id="LC432" class="line" lang="haskell"></span>
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433
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430
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<pre style="margin: 0;"> <span id="LC430" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *********************************************************************</span></span>
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434
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431
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<pre style="margin: 0;"> <span id="LC431" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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435
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432
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<pre style="margin: 0;"> <span id="LC432" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Closing over kinds</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">@@ -981,4 +978,3 @@ tyCoVarsOfTypeWellScoped = scopedSort . tyCoVarsOfTypeList</td>
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981
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978
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<pre style="margin: 0;"> <span id="LC978" class="line" lang="haskell"><span class="cd">-- | Get the free vars of types in scoped order</span></span>
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982
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979
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<pre style="margin: 0;"> <span id="LC979" class="line" lang="haskell"><span class="n" style="color: #333;">tyCoVarsOfTypesWellScoped</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span></span>
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983
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980
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<pre style="margin: 0;"> <span id="LC980" class="line" lang="haskell"><span class="n" style="color: #333;">tyCoVarsOfTypesWellScoped</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">scopedSort</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">tyCoVarsOfTypesList</span></span></pre>
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984
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<pre style="margin: 0;">-<span id="LC984" class="line" lang="haskell"></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/f5433f0bc06f65deb96a44b62d47875ec4bc5b38...5d3804aec65f0801363c28ca3bb8a15f4ef3e6db#578c7c3857d66d963736ff6742f3433a0e8d01b7"><strong>compiler/GHC/Core/TyCo/Rep.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -62,7 +62,7 @@ module GHC.Core.TyCo.Rep (</td>
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<pre style="margin: 0;"> <span id="LC62" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">pickLR</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC63" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC64" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ** Analyzing types</span></span>
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<pre style="margin: 0;">-<span id="LC65" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TyCoFolder</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">foldTyCo</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC65" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TyCoFolder</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">foldTyCo</span><span class="p">,</span><span class="idiff left"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">noView</span></span><span class="p"><span class="idiff right">,</span></span></span>
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<pre style="margin: 0;"> <span id="LC66" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC67" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- * Sizes</span></span>
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<pre style="margin: 0;"> <span id="LC68" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">typeSize</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">coercionSize</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">provSize</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">@@ -87,6 +87,7 @@ import GHC.Core.TyCon</td>
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<pre style="margin: 0;"> <span id="LC87" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Coercion.Axiom</span></span>
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<pre style="margin: 0;"> <span id="LC88" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC89" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- others</span></span>
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<pre style="margin: 0;">+<span id="LC90" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Unique</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Uniquable</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC91" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Basic</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">LeftOrRight</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">pickLR</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC92" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Outputable</span></span>
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<pre style="margin: 0;"> <span id="LC93" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.FastString</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1567,6 +1568,9 @@ instance Data.Data CoercionHole where</td>
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1567
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<pre style="margin: 0;"> <span id="LC1568" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">CoercionHole</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC1569" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoercionHole</span> <span class="p">{</span> <span class="n" style="color: #333;">ch_co_var</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cv</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">braces</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cv</span><span class="p">)</span></span>
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1569
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<pre style="margin: 0;"> <span id="LC1570" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1571" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Uniquable</span> <span class="kt" style="color: #458; font-weight: 600;">CoercionHole</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC1572" class="line" lang="haskell"> <span class="n" style="color: #333;">getUnique</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CoercionHole</span> <span class="p">{</span> <span class="n" style="color: #333;">ch_co_var</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">v</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">getUnique</span> <span class="n" style="color: #333;">v</span></span>
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1573
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<pre style="margin: 0;">+<span id="LC1573" class="line" lang="haskell"></span>
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1570
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1574
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<pre style="margin: 0;"> <span id="LC1574" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">BlockSubstFlag</span> <span class="kr" style="font-weight: 600;">where</span></span>
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1571
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1575
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<pre style="margin: 0;"> <span id="LC1575" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">YesBlockSubst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"YesBlockSubst"</span></span>
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1572
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1576
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<pre style="margin: 0;"> <span id="LC1576" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">NoBlockSubst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"NoBlockSubst"</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">@@ -1775,7 +1779,7 @@ We were also worried about</td>
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1775
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1779
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<pre style="margin: 0;"> <span id="LC1779" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> `extendVarSet` tv</span></span>
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1776
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1780
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<pre style="margin: 0;"> <span id="LC1780" class="line" lang="haskell"></span>
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1781
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<pre style="margin: 0;"> <span id="LC1781" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here deep_fvs and deep_tcf are mutually recursive, unlike fvs and tcf.</span></span>
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1778
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<pre style="margin: 0;">-<span id="LC1778" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But, amazingly, we get good code here too. GHC is careful not to ma<span class="idiff left right">kr</span></span></span>
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<pre style="margin: 0;">+<span id="LC1782" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But, amazingly, we get good code here too. GHC is careful not to ma<span class="idiff left right">rk</span></span></span>
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<pre style="margin: 0;"> <span id="LC1783" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">TyCoFolder data constructor for deep_tcf as a loop breaker, so the</span></span>
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1784
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<pre style="margin: 0;"> <span id="LC1784" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">record selections still cancel. And eta expansion still happens too.</span></span>
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1785
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<pre style="margin: 0;"> <span id="LC1785" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</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">@@ -1784,8 +1788,8 @@ data TyCoFolder env a</td>
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<pre style="margin: 0;"> <span id="LC1788" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TyCoFolder</span></span>
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<pre style="margin: 0;"> <span id="LC1789" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">tcf_view</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="c1" style="color: #998; font-style: italic;">-- Optional "view" function</span></span>
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1786
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1790
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<pre style="margin: 0;"> <span id="LC1790" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- E.g. expand synonyms</span></span>
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<pre style="margin: 0;">-<span id="LC1787" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcf_tyvar</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">-<span id="LC1788" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcf_covar</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC1791" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcf_tyvar</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span><span class="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- Does not automatically recur</span></span></span>
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<pre style="margin: 0;">+<span id="LC1792" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcf_covar</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span><span class="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- into kinds of variables</span></span></span>
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1793
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<pre style="margin: 0;"> <span id="LC1793" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcf_hole</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoercionHole</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span></span>
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1790
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1794
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<pre style="margin: 0;"> <span id="LC1794" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ What to do with coercion holes.</span></span>
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1791
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1795
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<pre style="margin: 0;"> <span id="LC1795" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Coercion holes] in GHC.Core.TyCo.Rep.</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">@@ -1854,6 +1858,10 @@ foldTyCo (TyCoFolder { tcf_view = view</td>
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1854
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1858
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<pre style="margin: 0;"> <span id="LC1858" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ProofIrrelProv</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go_co</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">co</span></span>
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1855
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1859
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<pre style="margin: 0;"> <span id="LC1859" class="line" lang="haskell"> <span class="n" style="color: #333;">go_prov</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PluginProv</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;">mempty</span></span>
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1856
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1860
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<pre style="margin: 0;"> <span id="LC1860" class="line" lang="haskell"></span>
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1861
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<pre style="margin: 0;">+<span id="LC1861" class="line" lang="haskell"><span class="cd">-- | A view function that looks through nothing.</span></span>
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1862
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<pre style="margin: 0;">+<span id="LC1862" class="line" lang="haskell"><span class="n" style="color: #333;">noView</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span></span>
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1863
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<pre style="margin: 0;">+<span id="LC1863" class="line" lang="haskell"><span class="n" style="color: #333;">noView</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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1864
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<pre style="margin: 0;">+<span id="LC1864" class="line" lang="haskell"></span>
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1865
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<pre style="margin: 0;"> <span id="LC1865" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *********************************************************************</span></span>
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1858
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1866
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<pre style="margin: 0;"> <span id="LC1866" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<pre style="margin: 0;"> <span id="LC1867" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> typeSize, coercionSize</span></span>
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<li id="84c9d3ba34173297e7d7747e02caa2e004b164fc">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/f5433f0bc06f65deb96a44b62d47875ec4bc5b38...5d3804aec65f0801363c28ca3bb8a15f4ef3e6db#84c9d3ba34173297e7d7747e02caa2e004b164fc"><strong>compiler/GHC/Core/Type.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -83,7 +83,7 @@ module GHC.Core.Type (</td>
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<pre style="margin: 0;"> <span id="LC83" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC84" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ** Analyzing types</span></span>
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<pre style="margin: 0;"> <span id="LC85" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TyCoMapper</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">mapTyCo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mapTyCoX</span><span class="p">,</span></span>
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86
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<pre style="margin: 0;">-<span id="LC86" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TyCoFolder</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">foldTyCo</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC86" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TyCoFolder</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">foldTyCo</span><span class="p">,</span><span class="idiff left"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">noView</span></span><span class="p"><span class="idiff right">,</span></span></span>
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<pre style="margin: 0;"> <span id="LC87" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC88" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (Newtypes)</span></span>
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<pre style="margin: 0;"> <span id="LC89" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">newTyConInstRhs</span><span class="p">,</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/f5433f0bc06f65deb96a44b62d47875ec4bc5b38...5d3804aec65f0801363c28ca3bb8a15f4ef3e6db#e4b9d5e9d2de37561bfd06a2c97a5c924a1bab76"><strong>compiler/GHC/Tc/Errors.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -22,8 +22,7 @@ import GHC.Tc.Utils.Monad</td>
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<pre style="margin: 0;"> <span id="LC22" 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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<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Predicate</span></span>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.TcMType</span></span>
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<pre style="margin: 0;">-<span id="LC25" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Unify</span><span class="p">(</span> <span class="n" style="color: #333;">occCheckForErrors</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">MetaTyVarUpdateResult</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="n" style="color: #333;">swapOverTyVars</span></span>
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<pre style="margin: 0;">-<span id="LC26" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">canSolveByUnification</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Unify</span><span class="p">(</span> <span class="n" style="color: #333;">occCheckForErrors</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">MetaTyVarUpdateResult</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC26" 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="n" style="color: #333;">tcInitTidyEnv</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC27" 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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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types.Origin</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">@@ -51,7 +50,6 @@ import GHC.Types.Id</td>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var</span></span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var.Set</span></span>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var.Env</span></span>
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<pre style="margin: 0;">-<span id="LC54" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Unique.Set</span></span>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Name.Set</span></span>
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.Bag</span></span>
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Error</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">ErrMsg</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">errDoc</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pprLocErrMsg</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">@@ -236,8 +234,7 @@ report_unsolved type_errors expr_holes</td>
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<pre style="margin: 0;"> <span id="LC234" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See #15539 and c.f. setting ic_status</span></span>
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<pre style="margin: 0;"> <span id="LC235" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in GHC.Tc.Solver.setImplicationStatus</span></span>
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<pre style="margin: 0;"> <span id="LC236" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cec_warn_redundant</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">warn_redundant</span></span>
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<pre style="margin: 0;">-<span id="LC239" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cec_binds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">binds_var</span></span>
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<pre style="margin: 0;">-<span id="LC240" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cec_already_reported</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyUniqSet</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC237" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cec_binds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">binds_var</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC238" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC239" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tc_lvl</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getTcLevel</span></span>
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<pre style="margin: 0;"> <span id="LC240" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">reportWanteds</span> <span class="n" style="color: #333;">err_ctxt</span> <span class="n" style="color: #333;">tc_lvl</span> <span class="n" style="color: #333;">wanted</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">@@ -345,8 +342,6 @@ data ReportErrCtxt</td>
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<pre style="margin: 0;"> <span id="LC342" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- so create bindings if need be, but</span></span>
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<pre style="margin: 0;"> <span id="LC343" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- don't issue any more errors/warnings</span></span>
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<pre style="margin: 0;"> <span id="LC344" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Suppressing error messages]</span></span>
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<pre style="margin: 0;">-<span id="LC348" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cec_already_reported</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">UniqSet</span> <span class="kt" style="color: #458; font-weight: 600;">Unique</span></span>
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<pre style="margin: 0;">-<span id="LC349" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Avoid reporting duplicates]</span></span>
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<pre style="margin: 0;"> <span id="LC345" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC346" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC347" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">ReportErrCtxt</span> <span class="kr" style="font-weight: 600;">where</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">@@ -531,66 +526,47 @@ This only matters in instance declarations..</td>
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<pre style="margin: 0;"> <span id="LC526" class="line" lang="haskell"><span class="cd">-- | A predicate with its arising location; used to encapsulate a constraint</span></span>
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<pre style="margin: 0;"> <span id="LC527" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- that will give rise to a warning.</span></span>
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<pre style="margin: 0;"> <span id="LC528" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">ErrorItem</span></span>
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<pre style="margin: 0;">-<span id="LC534" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">EI</span> <span class="p">{</span> <span class="n" style="color: #333;">ei_pred</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PredType</span> <span class="c1" style="color: #998; font-style: italic;">-- report about this</span></span>
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<pre style="margin: 0;">+<span id="LC529" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">EI</span> <span class="p">{</span> <span class="n" style="color: #333;">ei_pred</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PredType</span> <span class="c1" style="color: #998; font-style: italic;">-- report about this</span></span>
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<pre style="margin: 0;"> <span id="LC530" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The ei_pred field will never be an unboxed equality with</span></span>
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<pre style="margin: 0;">-<span id="LC536" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- a (casted) tyvar on the right; these are reoriented in mkErrorItem,</span></span>
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<pre style="margin: 0;">-<span id="LC537" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- so that the filtering in e.g. reportWanteds can be simpler</span></span>
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<pre style="margin: 0;">-<span id="LC538" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ei_type</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="c1" style="color: #998; font-style: italic;">-- produce evidence of this type</span></span>
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<pre style="margin: 0;">-<span id="LC539" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- see Note [Evidence types]</span></span>
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<pre style="margin: 0;">-<span id="LC540" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ei_evdest</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">TcEvDest</span> <span class="c1" style="color: #998; font-style: italic;">-- for Wanteds, where to put evidence</span></span>
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<pre style="margin: 0;">-<span id="LC541" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ei_flavour</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtFlavour</span></span>
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<pre style="margin: 0;">-<span id="LC542" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ei_loc</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span></span>
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<pre style="margin: 0;">-<span id="LC543" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ei_unique</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Unique</span></span>
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<pre style="margin: 0;">-<span id="LC544" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- for deduplication; see Note [Avoid reporting duplicates]</span></span>
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<pre style="margin: 0;">+<span id="LC531" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- a (casted) tyvar on the right; this is guaranteed by the solver</span></span>
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<pre style="margin: 0;">+<span id="LC532" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ei_evdest</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">TcEvDest</span> <span class="c1" style="color: #998; font-style: italic;">-- for Wanteds, where to put evidence</span></span>
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<pre style="margin: 0;">+<span id="LC533" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ei_flavour</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtFlavour</span></span>
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<pre style="margin: 0;">+<span id="LC534" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ei_loc</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span></span>
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<pre style="margin: 0;">+<span id="LC535" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ei_suppress</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="c1" style="color: #998; font-style: italic;">-- Suppress because of Note [Wanteds rewrite Wanteds]</span></span>
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<pre style="margin: 0;">+<span id="LC536" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in GHC.Tc.Constraint</span></span>
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<pre style="margin: 0;"> <span id="LC537" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC538" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC539" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">ErrorItem</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC548" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EI</span> <span class="p">{</span> <span class="n" style="color: #333;">ei_pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pred</span></span>
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<pre style="margin: 0;">-<span id="LC549" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ei_evdest</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">m_evdest</span></span>
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<pre style="margin: 0;">-<span id="LC550" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ei_flavour</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">flav</span> <span class="p">})</span></span>
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<pre style="margin: 0;">-<span id="LC551" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">flav</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pp_dest</span> <span class="n" style="color: #333;">m_evdest</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">pred</span></span>
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<pre style="margin: 0;">+<span id="LC540" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EI</span> <span class="p">{</span> <span class="n" style="color: #333;">ei_pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pred</span></span>
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<pre style="margin: 0;">+<span id="LC541" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ei_evdest</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">m_evdest</span></span>
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<pre style="margin: 0;">+<span id="LC542" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ei_flavour</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">flav</span></span>
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<pre style="margin: 0;">+<span id="LC543" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ei_suppress</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">supp</span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC544" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pp_supp</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">flav</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pp_dest</span> <span class="n" style="color: #333;">m_evdest</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">pred</span></span>
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<pre style="margin: 0;"> <span id="LC545" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC546" class="line" lang="haskell"> <span class="n" style="color: #333;">pp_dest</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">empty</span></span>
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<pre style="margin: 0;"> <span id="LC547" class="line" lang="haskell"> <span class="n" style="color: #333;">pp_dest</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">ev</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ev</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">dcolon</span></span>
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<pre style="margin: 0;"> <span id="LC548" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC549" class="line" lang="haskell"> <span class="n" style="color: #333;">pp_supp</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">supp</span> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"suppress:"</span> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">empty</span></span>
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<pre style="margin: 0;">+<span id="LC550" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC551" class="line" lang="haskell"><span class="cd">-- | Makes an error item based on the predicate-at-birth of the provided</span></span>
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<pre style="margin: 0;"> <span id="LC552" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- constraint. This should be rewritten w.r.t. givens before reported.</span></span>
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<pre style="margin: 0;">-<span id="LC558" class="line" lang="haskell"><span class="n" style="color: #333;">mkErrorItem</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;">ErrorItem</span></span>
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<pre style="margin: 0;">-<span id="LC559" class="line" lang="haskell"><span class="n" style="color: #333;">mkErrorItem</span> <span class="n" style="color: #333;">ct</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">EI</span> <span class="p">{</span> <span class="n" style="color: #333;">ei_pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyvar_first</span> <span class="n" style="color: #333;">pred</span></span>
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<pre style="margin: 0;">-<span id="LC560" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ei_type</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctPred</span> <span class="n" style="color: #333;">ct</span></span>
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<pre style="margin: 0;">-<span id="LC561" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ei_evdest</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">m_evdest</span></span>
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<pre style="margin: 0;">-<span id="LC562" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ei_flavour</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctFlavour</span> <span class="n" style="color: #333;">ct</span></span>
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<pre style="margin: 0;">-<span id="LC563" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ei_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="LC564" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ei_unique</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unique</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC565" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC566" 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;">ctLoc</span> <span class="n" style="color: #333;">ct</span></span>
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<pre style="margin: 0;">-<span id="LC567" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">m_evdest</span><span class="p">,</span> <span class="n" style="color: #333;">pred</span><span class="p">,</span> <span class="n" style="color: #333;">unique</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC568" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_dest</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dest</span></span>
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<pre style="margin: 0;">-<span id="LC569" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_report_as</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">report_as</span></span>
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570
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<pre style="margin: 0;">-<span id="LC570" 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;">ct_pred</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ctEvidence</span> <span class="n" style="color: #333;">ct</span></span>
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571
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<pre style="margin: 0;">-<span id="LC571" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">u</span><span class="p">,</span> <span class="n" style="color: #333;">p</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ctPredToReport</span> <span class="n" style="color: #333;">dest</span> <span class="n" style="color: #333;">ct_pred</span> <span class="n" style="color: #333;">report_as</span></span>
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572
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<pre style="margin: 0;">-<span id="LC572" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">dest</span><span class="p">,</span> <span class="n" style="color: #333;">p</span><span class="p">,</span> <span class="n" style="color: #333;">u</span><span class="p">)</span></span>
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573
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<pre style="margin: 0;">-<span id="LC573" class="line" lang="haskell"></span>
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574
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<pre style="margin: 0;">-<span id="LC574" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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575
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<pre style="margin: 0;">-<span id="LC575" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Nothing</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 class="n" style="color: #333;">ctUnique</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span></span>
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576
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<pre style="margin: 0;">-<span id="LC576" class="line" lang="haskell"></span>
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577
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<pre style="margin: 0;">-<span id="LC577" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We reorient any tyvar equalities to put the tyvar first; this</span></span>
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578
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<pre style="margin: 0;">-<span id="LC578" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- allows fewer cases when choosing how to treat errors. Forgetting</span></span>
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579
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<pre style="margin: 0;">-<span id="LC579" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to do this causes mischaracterization of errors.</span></span>
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580
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<pre style="margin: 0;">-<span id="LC580" class="line" lang="haskell"> <span class="n" style="color: #333;">tyvar_first</span> <span class="n" style="color: #333;">pred</span></span>
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581
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<pre style="margin: 0;">-<span id="LC581" 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;">r</span><span class="p">,</span> <span class="n" style="color: #333;">ty1</span><span class="p">,</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getEqPredTys_maybe</span> <span class="n" style="color: #333;">pred</span></span>
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582
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<pre style="margin: 0;">-<span id="LC582" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">tv2</span><span class="p">,</span> <span class="n" style="color: #333;">co2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getCastedTyVar_maybe</span> <span class="n" style="color: #333;">ty2</span></span>
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583
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<pre style="margin: 0;">-<span id="LC583" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">swapped_pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkPrimEqPredRole</span> <span class="n" style="color: #333;">r</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">tv2</span><span class="p">)</span></span>
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584
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<pre style="margin: 0;">-<span id="LC584" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ty1</span> <span class="p">`</span><span class="n" style="color: #333;">mkCastTy</span><span class="p">`</span> <span class="n" style="color: #333;">mkSymCo</span> <span class="n" style="color: #333;">co2</span><span class="p">)</span></span>
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585
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<pre style="margin: 0;">-<span id="LC585" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">in</span></span>
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586
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<pre style="margin: 0;">-<span id="LC586" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">getCastedTyVar_maybe</span> <span class="n" style="color: #333;">ty1</span> <span class="kr" style="font-weight: 600;">of</span></span>
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587
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<pre style="margin: 0;">-<span id="LC587" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- tyvar originally on right; non-tyvar originally on left: swap</span></span>
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588
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<pre style="margin: 0;">-<span id="LC588" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">swapped_pred</span></span>
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589
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<pre style="margin: 0;">-<span id="LC589" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">tv1</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span></span>
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590
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<pre style="margin: 0;">-<span id="LC590" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">swapOverTyVars</span> <span class="n" style="color: #333;">tv1</span> <span class="n" style="color: #333;">tv2</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">swapped_pred</span></span>
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591
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<pre style="margin: 0;">-<span id="LC591" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pred</span></span>
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592
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<pre style="margin: 0;">-<span id="LC592" 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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593
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<pre style="margin: 0;">-<span id="LC593" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pred</span></span>
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553
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<pre style="margin: 0;">+<span id="LC553" class="line" lang="haskell"><span class="n" style="color: #333;">mkErrorItem</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;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">ErrorItem</span></span>
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<pre style="margin: 0;">+<span id="LC554" class="line" lang="haskell"><span class="n" style="color: #333;">mkErrorItem</span> <span class="n" style="color: #333;">ct</span></span>
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<pre style="margin: 0;">+<span id="LC555" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctLoc</span> <span class="n" style="color: #333;">ct</span></span>
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556
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<pre style="margin: 0;">+<span id="LC556" class="line" lang="haskell"> <span class="n" style="color: #333;">flav</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctFlavour</span> <span class="n" style="color: #333;">ct</span></span>
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557
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<pre style="margin: 0;">+<span id="LC557" class="line" lang="haskell"></span>
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558
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<pre style="margin: 0;">+<span id="LC558" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">suppress</span><span class="p">,</span> <span class="n" style="color: #333;">m_evdest</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">ctEvidence</span> <span class="n" style="color: #333;">ct</span> <span class="kr" style="font-weight: 600;">of</span></span>
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559
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<pre style="margin: 0;">+<span id="LC559" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CtGiven</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">)</span></span>
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560
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<pre style="margin: 0;">+<span id="LC560" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_rewriters</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rewriters</span><span class="p">,</span> <span class="n" style="color: #333;">ctev_dest</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dest</span> <span class="p">}</span></span>
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561
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<pre style="margin: 0;">+<span id="LC561" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">supp</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">anyUnfilledCoercionHoles</span> <span class="n" style="color: #333;">rewriters</span></span>
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562
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<pre style="margin: 0;">+<span id="LC562" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">supp</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">dest</span><span class="p">)</span> <span class="p">}</span></span>
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563
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<pre style="margin: 0;">+<span id="LC563" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CtDerived</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC564" class="line" lang="haskell"></span>
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565
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<pre style="margin: 0;">+<span id="LC565" class="line" lang="haskell"> <span class="p">;</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;">EI</span> <span class="p">{</span> <span class="n" style="color: #333;">ei_pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctPred</span> <span class="n" style="color: #333;">ct</span></span>
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566
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<pre style="margin: 0;">+<span id="LC566" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ei_evdest</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">m_evdest</span></span>
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567
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<pre style="margin: 0;">+<span id="LC567" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ei_flavour</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">flav</span></span>
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<pre style="margin: 0;">+<span id="LC568" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ei_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="LC569" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ei_suppress</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">suppress</span> <span class="p">}}</span></span>
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<pre style="margin: 0;"> <span id="LC570" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC571" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- "RAE"</span></span>
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<pre style="margin: 0;"> <span id="LC572" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">tidyErrorItem :: TidyEnv -> ErrorItem -> ErrorItem</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">@@ -607,10 +583,7 @@ errorItemEqRel = predTypeEqRel . ei_pred</td>
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<pre style="margin: 0;"> <span id="LC583" class="line" lang="haskell"><span class="n" style="color: #333;">reportWanteds</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ReportErrCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcLevel</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC584" class="line" lang="haskell"><span class="n" style="color: #333;">reportWanteds</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">tc_lvl</span> <span class="p">(</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;">implics</span></span>
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585
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<pre style="margin: 0;"> <span id="LC585" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">wc_holes</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">holes</span> <span class="p">})</span></span>
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<pre style="margin: 0;">-<span id="LC610" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"reportWanteds 1"</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Simples ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">simples</span></span>
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<pre style="margin: 0;">-<span id="LC611" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Suppress ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">cec_suppress</span> <span class="n" style="color: #333;">ctxt</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC612" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"tidy_items ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tidy_items</span></span>
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<pre style="margin: 0;">-<span id="LC613" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"tidy_holes ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tidy_holes</span> <span class="p">])</span></span>
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<pre style="margin: 0;">+<span id="LC586" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC587" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- "RAE"</span></span>
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<pre style="margin: 0;"> <span id="LC588" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- rewrite all the errors with respect to the givens</span></span>
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<pre style="margin: 0;"> <span id="LC589" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; let givens = errCtxtGivens ctxt</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">@@ -629,6 +602,14 @@ reportWanteds ctxt tc_lvl (WC { wc_simple = simples, wc_impl = implics</td>
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<pre style="margin: 0;"> <span id="LC602" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; traceTc "reportWanteds 2" (vcat [ text "tidy_items =" <+> ppr tidy_items</span></span>
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<pre style="margin: 0;"> <span id="LC603" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> , text "tidy_holes =" <+> ppr tidy_holes ])</span></span>
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<pre style="margin: 0;"> <span id="LC604" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;">+<span id="LC605" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC606" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tidy_items</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">mkErrorItem</span> <span class="n" style="color: #333;">tidy_cts</span></span>
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607
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<pre style="margin: 0;">+<span id="LC607" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"reportWanteds 1"</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Simples ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">simples</span></span>
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608
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<pre style="margin: 0;">+<span id="LC608" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Suppress ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">cec_suppress</span> <span class="n" style="color: #333;">ctxt</span><span class="p">)</span></span>
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609
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<pre style="margin: 0;">+<span id="LC609" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"tidy_cts ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tidy_cts</span></span>
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610
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<pre style="margin: 0;">+<span id="LC610" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"tidy_items ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tidy_items</span></span>
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611
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<pre style="margin: 0;">+<span id="LC611" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"tidy_holes ="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tidy_holes</span> <span class="p">])</span></span>
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612
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<pre style="margin: 0;">+<span id="LC612" class="line" lang="haskell"></span>
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613
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<pre style="margin: 0;"> <span id="LC613" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- First, deal with any out-of-scope errors:</span></span>
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614
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<pre style="margin: 0;"> <span id="LC614" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">out_of_scope</span><span class="p">,</span> <span class="n" style="color: #333;">other_holes</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">partition</span> <span class="n" style="color: #333;">isOutOfScopeHole</span> <span class="n" style="color: #333;">tidy_holes</span></span>
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615
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<pre style="margin: 0;"> <span id="LC615" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- don't suppress out-of-scope errors</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">@@ -646,8 +627,7 @@ reportWanteds ctxt tc_lvl (WC { wc_simple = simples, wc_impl = implics</td>
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627
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<pre style="margin: 0;"> <span id="LC627" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- holes never suppress</span></span>
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628
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<pre style="margin: 0;"> <span id="LC628" class="line" lang="haskell"></span>
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629
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<pre style="margin: 0;"> <span id="LC629" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Suppressing confusing errors]</span></span>
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<pre style="margin: 0;">-<span id="LC649" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getDynFlags</span></span>
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650
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<pre style="margin: 0;">-<span id="LC650" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">suppressed_items</span><span class="p">,</span> <span class="n" style="color: #333;">items0</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">partition</span> <span class="p">(</span><span class="n" style="color: #333;">suppress</span> <span class="n" style="color: #333;">dflags</span><span class="p">)</span> <span class="n" style="color: #333;">tidy_items</span></span>
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<pre style="margin: 0;">+<span id="LC630" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">suppressed_items</span><span class="p">,</span> <span class="n" style="color: #333;">items0</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">partition</span> <span class="n" style="color: #333;">suppress</span> <span class="n" style="color: #333;">tidy_items</span></span>
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<pre style="margin: 0;"> <span id="LC631" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"reportWanteds suppressed:"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">suppressed_items</span><span class="p">)</span></span>
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632
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<pre style="margin: 0;"> <span id="LC632" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">ctxt1</span><span class="p">,</span> <span class="n" style="color: #333;">items1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tryReporters</span> <span class="n" style="color: #333;">ctxt_for_insols</span> <span class="n" style="color: #333;">report1</span> <span class="n" style="color: #333;">items0</span></span>
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<pre style="margin: 0;"> <span id="LC633" 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">@@ -663,13 +643,11 @@ reportWanteds ctxt tc_lvl (WC { wc_simple = simples, wc_impl = implics</td>
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<pre style="margin: 0;"> <span id="LC643" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to report unsolved Derived goals as errors</span></span>
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<pre style="margin: 0;"> <span id="LC644" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Do not report derived but soluble errors]</span></span>
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<pre style="margin: 0;"> <span id="LC645" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC666" class="line" lang="haskell"> <span class="p">;</span> <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">inner_ctxt</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">ctxt2</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">cec_already_reported</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">cec_already_reported</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ctxt3</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">}</span></span></span>
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<pre style="margin: 0;">+<span id="LC646" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;"><span class="idiff left">mapBagM_</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">reportImplic</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ctxt2</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">implics</span></span></span>
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<pre style="margin: 0;"> <span id="LC647" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB ctxt2: don't suppress inner insolubles if there's only a</span></span>
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<pre style="margin: 0;"> <span id="LC648" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- wanted insoluble here; but do suppress inner insolubles</span></span>
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<pre style="margin: 0;"> <span id="LC649" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- if there's a *given* insoluble here (= inaccessible code)</span></span>
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<pre style="margin: 0;"> <span id="LC650" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC671" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mapBagM_</span> <span class="p">(</span><span class="n" style="color: #333;">reportImplic</span> <span class="n" style="color: #333;">inner_ctxt</span><span class="p">)</span> <span class="n" style="color: #333;">implics</span></span>
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<pre style="margin: 0;">-<span id="LC672" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC651" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Only now, if there are no errors, do we report suppressed ones</span></span>
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<pre style="margin: 0;"> <span id="LC652" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Suppressing confusing errors]</span></span>
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<pre style="margin: 0;"> <span id="LC653" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We don't need to update the context further because of the</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -679,30 +657,12 @@ reportWanteds ctxt tc_lvl (WC { wc_simple = simples, wc_impl = implics</td>
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<pre style="margin: 0;"> <span id="LC657" class="line" lang="haskell"> <span class="p">;</span> <span class="kt" style="color: #458; font-weight: 600;">MASSERT2</span><span class="p">(</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">more_leftovers</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">more_leftovers</span> <span class="p">)</span> <span class="p">}</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC658" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC659" class="line" lang="haskell"> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cec_tidy</span> <span class="n" style="color: #333;">ctxt</span></span>
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<pre style="margin: 0;">-<span id="LC682" class="line" lang="haskell"> <span class="n" style="color: #333;">tidy_<span class="idiff left">items</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">bagToList</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">mapBag</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">mkErrorItem</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">.</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">tidyCt</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">simples</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC660" class="line" lang="haskell"> <span class="n" style="color: #333;">tidy_<span class="idiff left">cts</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">bagToList</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">mapBag</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">(</span></span><span class="n" style="color: #333;">tidyCt</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">simples</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC661" class="line" lang="haskell"> <span class="n" style="color: #333;">tidy_holes</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bagToList</span> <span class="p">(</span><span class="n" style="color: #333;">mapBag</span> <span class="p">(</span><span class="n" style="color: #333;">tidyHole</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="n" style="color: #333;">holes</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC662" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC663" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Suppressing confusing errors]</span></span>
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<pre style="margin: 0;">-<span id="LC686" class="line" lang="haskell"> <span class="n" style="color: #333;">suppress</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ErrorItem</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="LC687" class="line" lang="haskell"> <span class="n" style="color: #333;">suppress</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">item</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EI</span> <span class="p">{</span> <span class="n" style="color: #333;">ei_pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pred</span> <span class="p">})</span></span>
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<pre style="margin: 0;">-<span id="LC688" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">badCoercionHole</span> <span class="n" style="color: #333;">pred</span></span>
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689
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<pre style="margin: 0;">-<span id="LC689" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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690
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<pre style="margin: 0;">-<span id="LC690" class="line" lang="haskell"></span>
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691
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<pre style="margin: 0;">-<span id="LC691" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Equalities with incompatible kinds] in GHC.Tc.Solver.Canonical;</span></span>
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692
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<pre style="margin: 0;">-<span id="LC692" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- point (4c)</span></span>
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693
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<pre style="margin: 0;">-<span id="LC693" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">ty1</span><span class="p">,</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getEqPredTys_maybe</span> <span class="n" style="color: #333;">pred</span></span>
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694
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<pre style="margin: 0;">-<span id="LC694" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">tv1</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getTyVar_maybe</span> <span class="n" style="color: #333;">ty1</span></span>
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695
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<pre style="margin: 0;">-<span id="LC695" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">canSolveByUnification</span> <span class="n" style="color: #333;">tc_lvl</span> <span class="n" style="color: #333;">tv1</span> <span class="n" style="color: #333;">ty2</span></span>
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696
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<pre style="margin: 0;">-<span id="LC696" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">MTVU_OK</span> <span class="nb" style="color: #0086b3;">()</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">occCheckForErrors</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">tv1</span> <span class="n" style="color: #333;">ty2</span></span>
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697
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<pre style="margin: 0;">-<span id="LC697" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- this last line checks for e.g. impredicative situations; we don't</span></span>
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698
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<pre style="margin: 0;">-<span id="LC698" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- want to suppress an error if the problem is impredicativity</span></span>
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699
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<pre style="margin: 0;">-<span id="LC699" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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700
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<pre style="margin: 0;">-<span id="LC700" class="line" lang="haskell"></span>
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701
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<pre style="margin: 0;">-<span id="LC701" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">is_ww_fundep_item</span> <span class="n" style="color: #333;">item</span></span>
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702
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<pre style="margin: 0;">-<span id="LC702" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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703
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<pre style="margin: 0;">-<span id="LC703" class="line" lang="haskell"></span>
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704
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<pre style="margin: 0;">-<span id="LC704" 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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705
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<pre style="margin: 0;">-<span id="LC705" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">+<span id="LC664" class="line" lang="haskell"> <span class="n" style="color: #333;">suppress</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ErrorItem</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="LC665" class="line" lang="haskell"> <span class="n" style="color: #333;">suppress</span> <span class="n" style="color: #333;">item</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">is_ww_fundep_item</span> <span class="n" style="color: #333;">item</span></span>
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666
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<pre style="margin: 0;"> <span id="LC666" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC667" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- report1: ones that should *not* be suppressed by</span></span>
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<pre style="margin: 0;"> <span id="LC668" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- an insoluble somewhere else in the tree</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">@@ -734,8 +694,7 @@ reportWanteds ctxt tc_lvl (WC { wc_simple = simples, wc_impl = implics</td>
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734
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694
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<pre style="margin: 0;"> <span id="LC694" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC695" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- report3: suppressed errors should be reported as categorized by either report1</span></span>
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736
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696
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<pre style="margin: 0;"> <span id="LC696" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- or report2.</span></span>
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737
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<pre style="margin: 0;">-<span id="LC737" class="line" lang="haskell"> <span class="n" style="color: #333;">report3</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span> <span class="p">(</span><span class="s" style="color: #d14;">"wanted/wanted fundeps"</span><span class="p">,</span> <span class="n" style="color: #333;">is_ww_fundep</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">,</span> <span class="n" style="color: #333;">mkGroupReporter</span> <span class="n" style="color: #333;">mkEqErr</span><span class="p">)</span></span>
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738
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<pre style="margin: 0;">-<span id="LC738" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="s" style="color: #d14;">"Blocked eqs"</span><span class="p">,</span> <span class="n" style="color: #333;">is_equality</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">,</span> <span class="n" style="color: #333;">mkGroupReporter</span> <span class="n" style="color: #333;">mkBlockedEqErr</span><span class="p">)</span> <span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC697" class="line" lang="haskell"> <span class="n" style="color: #333;">report3</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span> <span class="p">(</span><span class="s" style="color: #d14;">"wanted/wanted fundeps"</span><span class="p">,</span> <span class="n" style="color: #333;">is_ww_fundep</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">,</span> <span class="n" style="color: #333;">mkGroupReporter</span> <span class="n" style="color: #333;">mkEqErr</span><span class="p">)</span> <span class="p">]</span></span>
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698
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<pre style="margin: 0;"> <span id="LC698" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC699" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- rigid_nom_eq, rigid_nom_tv_eq,</span></span>
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741
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700
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<pre style="margin: 0;"> <span id="LC700" class="line" lang="haskell"> <span class="n" style="color: #333;">is_dict</span><span class="p">,</span> <span class="n" style="color: #333;">is_equality</span><span class="p">,</span> <span class="n" style="color: #333;">is_ip</span><span class="p">,</span> <span class="n" style="color: #333;">is_irred</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ErrorItem</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Pred</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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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -828,12 +787,9 @@ isTyFun_maybe ty = case tcSplitTyConApp_maybe ty of</td>
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828
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<pre style="margin: 0;"> <span id="LC787" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Certain errors we might encounter are potentially confusing to users.</span></span>
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829
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<pre style="margin: 0;"> <span id="LC788" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If there are any other errors to report, at all, we want to suppress these.</span></span>
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789
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<pre style="margin: 0;"> <span id="LC789" class="line" lang="haskell"></span>
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831
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<pre style="margin: 0;">-<span id="LC831" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Which errors:</span></span>
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790
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<pre style="margin: 0;">+<span id="LC790" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Which errors<span class="idiff left right"> (right now, only 1, but this may grow)</span>:</span></span>
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832
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791
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<pre style="margin: 0;"> <span id="LC791" class="line" lang="haskell"></span>
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833
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<pre style="margin: 0;">-<span id="LC833" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">1) Errors which are blocked by a coercion hole. This is described</span></span>
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<pre style="margin: 0;">-<span id="LC834" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in point (4) of Note [Equalities with incompatible kinds] in Tc.Solver.Canonical.</span></span>
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<pre style="margin: 0;">-<span id="LC835" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC836" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">2) Errors which arise from the interaction of two Wanted fun-dep constraints.</span></span>
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<pre style="margin: 0;">+<span id="LC792" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Errors which arise from the interaction of two Wanted fun-dep constraints.</span></span>
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<pre style="margin: 0;"> <span id="LC793" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Example:</span></span>
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794
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<pre style="margin: 0;"> <span id="LC794" class="line" lang="haskell"></span>
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795
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<pre style="margin: 0;"> <span id="LC795" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> class C a b | a -> b where</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">@@ -867,27 +823,6 @@ We use the `suppress` function within reportWanteds to filter out these two</td>
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<pre style="margin: 0;"> <span id="LC823" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">cases, then report all other errors. Lastly, we return to these suppressed</span></span>
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<pre style="margin: 0;"> <span id="LC824" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">ones and report them only if there have been no errors so far.</span></span>
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<pre style="margin: 0;"> <span id="LC825" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC870" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Avoid reporting duplicates]</span></span>
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<pre style="margin: 0;">-<span id="LC871" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC872" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">It would be embarrassing to report two identical errors to the user. We</span></span>
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<pre style="margin: 0;">-<span id="LC873" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">avoid doing so by logging a Unique associated with every error, in the</span></span>
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<pre style="margin: 0;">-<span id="LC874" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">cec_already_reported field of a ReportErrCtxt. These Uniques come from:</span></span>
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<pre style="margin: 0;">-<span id="LC875" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC876" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * For Givens: it's the Unique on the ctev_evar storing the Given evidence.</span></span>
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<pre style="margin: 0;">-<span id="LC877" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC878" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * For Wanteds with CtReportAsSame: it's the Unique associated with the</span></span>
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879
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<pre style="margin: 0;">-<span id="LC879" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> TcEvDest.</span></span>
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<pre style="margin: 0;">-<span id="LC880" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC881" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * For Wanteds with CtReportAsOther: it's the Unique in the CtReportAsOther,</span></span>
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882
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<pre style="margin: 0;">-<span id="LC882" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> which in turn comes from the TcEvDest of the originating Wanted, as placed</span></span>
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883
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<pre style="margin: 0;">-<span id="LC883" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> there in updateReportAs.</span></span>
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<pre style="margin: 0;">-<span id="LC884" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC885" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We still must be sure to process all errors, including duplicates, because</span></span>
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886
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<pre style="margin: 0;">-<span id="LC886" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of the possibility of -fdefer-type-errors; each duplicate may carry its own</span></span>
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887
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<pre style="margin: 0;">-<span id="LC887" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">evidence (in the case of several constraints sharing the same CtReportAsOther).</span></span>
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888
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<pre style="margin: 0;">-<span id="LC888" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But when an error appears already in the cec_already_reported, we suppress</span></span>
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889
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<pre style="margin: 0;">-<span id="LC889" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the user-visible error report.</span></span>
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<pre style="margin: 0;">-<span id="LC890" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC826" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;"> <span id="LC827" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC828" 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">@@ -1089,12 +1024,11 @@ maybeReportError ctxt items err</td>
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<pre style="margin: 0;"> <span id="LC1024" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">cec_suppress</span> <span class="n" style="color: #333;">ctxt</span> <span class="c1" style="color: #998; font-style: italic;">-- Some worse error has occurred;</span></span>
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1025
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<pre style="margin: 0;"> <span id="LC1025" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span> <span class="c1" style="color: #998; font-style: italic;">-- so suppress this error/warning</span></span>
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1091
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1026
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<pre style="margin: 0;"> <span id="LC1026" class="line" lang="haskell"></span>
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1092
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<pre style="margin: 0;">-<span id="LC1092" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">any</span> <span class="p">((`</span><span class="n" style="color: #333;">elementOfUniqSet</span><span class="p">`</span> <span class="n" style="color: #333;">cec_already_reported</span> <span class="n" style="color: #333;">ctxt</span><span class="p">)</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">ei_unique</span><span class="p">)</span> <span class="n" style="color: #333;">items</span></span>
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1027
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<pre style="margin: 0;">+<span id="LC1027" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">all</span> <span class="n" style="color: #333;">ei_suppress</span> <span class="n" style="color: #333;">items</span> <span class="c1" style="color: #998; font-style: italic;">-- if they're all to be suppressed, report nothing</span></span>
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1028
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<pre style="margin: 0;">+<span id="LC1028" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- if at least one is not suppressed, do report:</span></span>
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1029
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<pre style="margin: 0;">+<span id="LC1029" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the function that generates the error message</span></span>
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1030
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<pre style="margin: 0;">+<span id="LC1030" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- should look for an unsuppressed error item</span></span>
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1093
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1031
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<pre style="margin: 0;"> <span id="LC1031" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1094
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<pre style="margin: 0;">-<span id="LC1094" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- suppress the group if any have been reported. Ideally, we'd like</span></span>
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1095
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<pre style="margin: 0;">-<span id="LC1095" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to suppress exactly those that have been reported, but this is</span></span>
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1096
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<pre style="margin: 0;">-<span id="LC1096" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- awkward, and it's more embarrassing to report the same error</span></span>
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1097
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<pre style="margin: 0;">-<span id="LC1097" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- twice than to suppress too eagerly</span></span>
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1098
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1032
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<pre style="margin: 0;"> <span id="LC1032" class="line" lang="haskell"></span>
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1099
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1033
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<pre style="margin: 0;"> <span id="LC1033" 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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1100
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1034
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<pre style="margin: 0;"> <span id="LC1034" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">cec_defer_type_errors</span> <span class="n" style="color: #333;">ctxt</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1038" 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">@@ -1104,8 +1038,7 @@ maybeReportError ctxt items err</td>
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1104
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1038
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<pre style="margin: 0;"> <span id="LC1038" class="line" lang="haskell"></span>
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1105
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1039
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<pre style="margin: 0;"> <span id="LC1039" class="line" lang="haskell"><span class="n" style="color: #333;">addDeferredBinding</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ReportErrCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ErrMsg</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ErrorItem</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1106
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1040
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<pre style="margin: 0;"> <span id="LC1040" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Deferring coercion errors to runtime]</span></span>
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1107
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<pre style="margin: 0;">-<span id="LC1107" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Evidence types]</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;">addDeferredBinding</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">err</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EI</span> <span class="p">{</span> <span class="n" style="color: #333;">ei_evdest</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">dest</span><span class="p">,</span> <span class="n" style="color: #333;">ei_type</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">item_ty</span> <span class="p">})</span></span>
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1041
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<pre style="margin: 0;">+<span id="LC1041" class="line" lang="haskell"><span class="n" style="color: #333;">addDeferredBinding</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">err</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EI</span> <span class="p">{</span> <span class="n" style="color: #333;">ei_evdest</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">dest</span><span class="p">,</span> <span class="n" style="color: #333;">ei_pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">item_ty</span> <span class="p">})</span></span>
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1109
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1042
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<pre style="margin: 0;"> <span id="LC1042" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- if evdest is Just, then the constraint was from a wanted</span></span>
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1110
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1043
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<pre style="margin: 0;"> <span id="LC1043" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">deferringAnyBindings</span> <span class="n" style="color: #333;">ctxt</span></span>
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1044
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<pre style="margin: 0;"> <span id="LC1044" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getDynFlags</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1175" 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>
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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">@@ -1175,15 +1108,9 @@ tryReporter ctxt (str, keep_me, suppress_after, reporter) items</td>
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1175
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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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1176
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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="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tryReporter{ "</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="n" style="color: #333;">str</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">yeses</span><span class="p">)</span></span>
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1177
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1110
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<pre style="margin: 0;"> <span id="LC1110" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">no_errs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">askNoErrs</span> <span class="p">(</span><span class="n" style="color: #333;">reporter</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">yeses</span><span class="p">)</span></span>
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1178
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<pre style="margin: 0;">-<span id="LC1178" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">suppress_these</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cec_suppress</span> <span class="n" style="color: #333;">ctxt</span></span>
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1179
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<pre style="margin: 0;">-<span id="LC1179" class="line" lang="haskell"> <span class="n" style="color: #333;">suppress_now</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">no_errs</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">suppress_after</span></span>
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1111
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<pre style="margin: 0;">+<span id="LC1111" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">suppress_now</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">no_errs</span> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">suppress_after</span></span>
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1112
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<pre style="margin: 0;"> <span id="LC1112" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Suppressing error messages]</span></span>
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<pre style="margin: 0;">-<span id="LC1181" class="line" lang="haskell"> <span class="n" style="color: #333;">already_reported</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cec_already_reported</span> <span class="n" style="color: #333;">ctxt</span></span>
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1182
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<pre style="margin: 0;">-<span id="LC1182" class="line" lang="haskell"> <span class="n" style="color: #333;">already_reported'</span></span>
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1183
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<pre style="margin: 0;">-<span id="LC1183" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">suppress_these</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">already_reported</span></span>
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1184
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<pre style="margin: 0;">-<span id="LC1184" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addListToUniqSet</span> <span class="n" style="color: #333;">already_reported</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">ei_unique</span> <span class="n" style="color: #333;">yeses</span><span class="p">)</span></span>
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1185
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<pre style="margin: 0;">-<span id="LC1185" class="line" lang="haskell"> <span class="n" style="color: #333;">ctxt'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctxt</span> <span class="p">{</span> <span class="n" style="color: #333;">cec_suppress</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">suppress_now</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">suppress_these</span></span>
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1186
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<pre style="margin: 0;">-<span id="LC1186" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cec_already_reported</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">already_reported'</span> <span class="p">}</span></span>
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1113
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<pre style="margin: 0;">+<span id="LC1113" class="line" lang="haskell"> <span class="n" style="color: #333;">ctxt'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctxt</span> <span class="p">{</span> <span class="n" style="color: #333;">cec_suppress</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">suppress_now</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">cec_suppress</span> <span class="n" style="color: #333;">ctxt</span> <span class="p">}</span></span>
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1187
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1114
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<pre style="margin: 0;"> <span id="LC1114" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tryReporter end }"</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="n" style="color: #333;">str</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">cec_suppress</span> <span class="n" style="color: #333;">ctxt</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">suppress_after</span><span class="p">)</span></span>
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1188
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1115
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<pre style="margin: 0;"> <span id="LC1115" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">ctxt'</span><span class="p">,</span> <span class="n" style="color: #333;">nos</span><span class="p">)</span> <span class="p">}</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;">where</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">@@ -1269,16 +1196,6 @@ from that EvVar, filling the hole with that coercion. Because coercions'</td>
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1269
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1196
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<pre style="margin: 0;"> <span id="LC1196" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">types are unlifted, the error is guaranteed to be hit before we get to the</span></span>
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1197
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<pre style="margin: 0;"> <span id="LC1197" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">coercion.</span></span>
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1271
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1198
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<pre style="margin: 0;"> <span id="LC1198" class="line" lang="haskell"></span>
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1272
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<pre style="margin: 0;">-<span id="LC1272" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Evidence types]</span></span>
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1273
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<pre style="margin: 0;">-<span id="LC1273" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~</span></span>
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1274
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<pre style="margin: 0;">-<span id="LC1274" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">As explained in Note [Wanteds rewrite Wanteds] in GHC.Tc.Types.Constraint,</span></span>
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1275
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<pre style="margin: 0;">-<span id="LC1275" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we report errors about predicates that have been rewritten only with respect</span></span>
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1276
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<pre style="margin: 0;">-<span id="LC1276" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to givens, never wanteds. However, when we are generating evidence for</span></span>
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1277
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<pre style="margin: 0;">-<span id="LC1277" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">deferred errors in addDeferredBinding, we need this evidence to have the</span></span>
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1278
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<pre style="margin: 0;">-<span id="LC1278" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">type that the context expects, which is the one rewritten w.r.t. all other</span></span>
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1279
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<pre style="margin: 0;">-<span id="LC1279" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">constraints, including Wanteds. So we keep this type in ErrorItem and</span></span>
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<pre style="margin: 0;">-<span id="LC1280" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">use it in addDeferredBinding. Nothing hard, but it's easy to forget to do.</span></span>
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<pre style="margin: 0;">-<span id="LC1281" class="line" lang="haskell"></span>
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1199
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<pre style="margin: 0;"> <span id="LC1199" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [No ancestors in addDeferredBinding]</span></span>
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1200
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<pre style="margin: 0;"> <span id="LC1200" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1201
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<pre style="margin: 0;"> <span id="LC1201" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Generally, we wish to report errors about the *ancestors* of constraints, not</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">@@ -1348,12 +1265,20 @@ mkIrredErr :: ReportErrCtxt -> [ErrorItem] -> TcM ErrMsg</td>
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1348
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<pre style="margin: 0;"> <span id="LC1265" class="line" lang="haskell"><span class="n" style="color: #333;">mkIrredErr</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">items</span></span>
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1349
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1266
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<pre style="margin: 0;"> <span id="LC1266" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">ctxt</span><span class="p">,</span> <span class="n" style="color: #333;">binds_msg</span><span class="p">,</span> <span class="n" style="color: #333;">item1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">relevantBindings</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">item1</span></span>
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1267
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<pre style="margin: 0;"> <span id="LC1267" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">orig</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">errorItemOrigin</span> <span class="n" style="color: #333;">item1</span></span>
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1351
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<pre style="margin: 0;">-<span id="LC1351" class="line" lang="haskell"> <span class="n" style="color: #333;">msg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">couldNotDeduce</span> <span class="p">(</span><span class="n" style="color: #333;">getUserGivens</span> <span class="n" style="color: #333;">ctxt</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">map</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ei_pred</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">item</span>s</span><span class="p">,</span> <span class="n" style="color: #333;">orig</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1268" class="line" lang="haskell"> <span class="n" style="color: #333;">msg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">couldNotDeduce</span> <span class="p">(</span><span class="n" style="color: #333;">getUserGivens</span> <span class="n" style="color: #333;">ctxt</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left right">pred</span>s</span><span class="p">,</span> <span class="n" style="color: #333;">orig</span><span class="p">)</span></span>
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1352
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1269
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<pre style="margin: 0;"> <span id="LC1269" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mkErrorMsgFromItem</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">item1</span> <span class="o" style="font-weight: 600;">$</span></span>
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1353
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1270
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<pre style="margin: 0;"> <span id="LC1270" class="line" lang="haskell"> <span class="n" style="color: #333;">important</span> <span class="n" style="color: #333;">msg</span> <span class="p">`</span><span class="n" style="color: #333;">mappend</span><span class="p">`</span> <span class="n" style="color: #333;">mk_relevant_bindings</span> <span class="n" style="color: #333;">binds_msg</span> <span class="p">}</span></span>
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1354
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1271
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<pre style="margin: 0;"> <span id="LC1271" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1355
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<pre style="margin: 0;"> <span id="LC1272" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">item1</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;">items</span></span>
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1356
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1273
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<pre style="margin: 0;"> <span id="LC1273" class="line" lang="haskell"></span>
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1274
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<pre style="margin: 0;">+<span id="LC1274" class="line" lang="haskell"> <span class="n" style="color: #333;">filtered_preds</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span> <span class="n" style="color: #333;">pred</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">item</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">items</span></span>
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1275
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<pre style="margin: 0;">+<span id="LC1275" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">ei_suppress</span> <span class="n" style="color: #333;">item</span><span class="p">)</span></span>
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1276
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<pre style="margin: 0;">+<span id="LC1276" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ei_pred</span> <span class="n" style="color: #333;">item</span> <span class="p">]</span></span>
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1277
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<pre style="margin: 0;">+<span id="LC1277" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1278" class="line" lang="haskell"> <span class="n" style="color: #333;">preds</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">filtered_preds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">ei_pred</span> <span class="n" style="color: #333;">items</span></span>
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1279
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<pre style="margin: 0;">+<span id="LC1279" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- they're all suppressed; must report *something*</span></span>
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1280
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<pre style="margin: 0;">+<span id="LC1280" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filtered_preds</span></span>
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1281
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<pre style="margin: 0;">+<span id="LC1281" class="line" lang="haskell"></span>
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1357
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1282
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<pre style="margin: 0;"> <span id="LC1282" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">----------------</span></span>
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1358
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1283
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<pre style="margin: 0;"> <span id="LC1283" class="line" lang="haskell"><span class="n" style="color: #333;">mkHoleError</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">ErrorItem</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ReportErrCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Hole</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;">ErrMsg</span></span>
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1359
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1284
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<pre style="margin: 0;"> <span id="LC1284" class="line" lang="haskell"><span class="n" style="color: #333;">mkHoleError</span> <span class="n" style="color: #333;">_tidy_simples</span> <span class="n" style="color: #333;">_ctxt</span> <span class="n" style="color: #333;">hole</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Hole</span> <span class="p">{</span> <span class="n" style="color: #333;">hole_occ</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">occ</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">@@ -1482,7 +1407,7 @@ validHoleFits ctxt@(CEC { cec_encl = implics</td>
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1482
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1407
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<pre style="margin: 0;"> <span id="LC1407" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_dest</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dest</span></span>
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1483
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1408
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<pre style="margin: 0;"> <span id="LC1408" class="line" lang="haskell"> <span class="p">,</span> <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>
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1484
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1409
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<pre style="margin: 0;"> <span id="LC1409" 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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1485
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<pre style="margin: 0;">-<span id="LC1485" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_re<span class="idiff left">port_as</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">CtReportAsSame</span></span> <span class="p">}</span></span>
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1410
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<pre style="margin: 0;">+<span id="LC1410" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_re<span class="idiff left">writers</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 right">emptyRewriterSet</span></span> <span class="p">}</span></span>
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1486
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1411
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<pre style="margin: 0;"> <span id="LC1411" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_wanted</span> <span class="n" style="color: #333;">item</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"validHoleFits no evdest"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">item</span><span class="p">)</span></span>
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1487
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1412
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<pre style="margin: 0;"> <span id="LC1412" class="line" lang="haskell"></span>
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1488
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1413
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<pre style="margin: 0;"> <span id="LC1413" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Constraints include ...]</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1428" 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">@@ -1503,6 +1428,9 @@ givenConstraintsMsg ctxt =</td>
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1503
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1428
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<pre style="margin: 0;"> <span id="LC1428" class="line" lang="haskell"></span>
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1504
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1429
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<pre style="margin: 0;"> <span id="LC1429" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">----------------</span></span>
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1505
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1430
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<pre style="margin: 0;"> <span id="LC1430" class="line" lang="haskell"><span class="n" style="color: #333;">mkIPErr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ReportErrCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">ErrorItem</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="kt" style="color: #458; font-weight: 600;">ErrMsg</span></span>
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1431
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<pre style="margin: 0;">+<span id="LC1431" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- What would happen if an item is suppressed because of</span></span>
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1432
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<pre style="margin: 0;">+<span id="LC1432" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note [Wanteds rewrite Wanteds] in GHC.Tc.Types.Constraint? Very unclear</span></span>
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1433
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<pre style="margin: 0;">+<span id="LC1433" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- what's best. Let's not worry about this.</span></span>
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1506
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1434
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<pre style="margin: 0;"> <span id="LC1434" class="line" lang="haskell"><span class="n" style="color: #333;">mkIPErr</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">items</span></span>
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1507
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1435
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<pre style="margin: 0;"> <span id="LC1435" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">ctxt</span><span class="p">,</span> <span class="n" style="color: #333;">binds_msg</span><span class="p">,</span> <span class="n" style="color: #333;">item1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">relevantBindings</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">item1</span></span>
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1508
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1436
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<pre style="margin: 0;"> <span id="LC1436" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">orig</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">errorItemOrigin</span> <span class="n" style="color: #333;">item1</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">@@ -1580,8 +1508,16 @@ any more. So we don't assert that it is.</td>
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1580
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1508
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<pre style="margin: 0;"> <span id="LC1508" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Don't have multiple equality errors from the same location</span></span>
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1581
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1509
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<pre style="margin: 0;"> <span id="LC1509" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- E.g. (Int,Bool) ~ (Bool,Int) one error will do!</span></span>
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1582
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1510
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<pre style="margin: 0;"> <span id="LC1510" class="line" lang="haskell"><span class="n" style="color: #333;">mkEqErr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ReportErrCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">ErrorItem</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="kt" style="color: #458; font-weight: 600;">ErrMsg</span></span>
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1583
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<pre style="margin: 0;">-<span id="LC1583" class="line" lang="haskell"><span class="n" style="color: #333;">mkEqErr</span> <span class="n" style="color: #333;">ctxt</span> <span class="p">(</span><span class="n" style="color: #333;">item</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;">mkEqErr1</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">item</span></span>
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1584
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<pre style="margin: 0;">-<span id="LC1584" class="line" lang="haskell"><span class="n" style="color: #333;">mkEqErr</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"mkEqErr"</span></span>
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1511
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<pre style="margin: 0;">+<span id="LC1511" class="line" lang="haskell"><span class="n" style="color: #333;">mkEqErr</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">items</span></span>
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1512
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<pre style="margin: 0;">+<span id="LC1512" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">item</span><span class="o" style="font-weight: 600;">:</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">filter</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">ei_suppress</span><span class="p">)</span> <span class="n" style="color: #333;">items</span></span>
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1513
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<pre style="margin: 0;">+<span id="LC1513" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkEqErr1</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">item</span></span>
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1514
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<pre style="margin: 0;">+<span id="LC1514" class="line" lang="haskell"></span>
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1515
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<pre style="margin: 0;">+<span id="LC1515" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">item</span><span class="o" style="font-weight: 600;">:</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">items</span> <span class="c1" style="color: #998; font-style: italic;">-- they're all suppressed. still need an error message</span></span>
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1516
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<pre style="margin: 0;">+<span id="LC1516" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- for -fdefer-type-errors though</span></span>
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1517
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<pre style="margin: 0;">+<span id="LC1517" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkEqErr1</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">item</span></span>
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1518
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<pre style="margin: 0;">+<span id="LC1518" class="line" lang="haskell"></span>
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1519
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<pre style="margin: 0;">+<span id="LC1519" 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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1520
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<pre style="margin: 0;">+<span id="LC1520" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"mkEqErr"</span> <span class="c1" style="color: #998; font-style: italic;">-- guaranteed to have at least one item</span></span>
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1585
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1521
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<pre style="margin: 0;"> <span id="LC1521" class="line" lang="haskell"></span>
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1586
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1522
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<pre style="margin: 0;"> <span id="LC1522" class="line" lang="haskell"><span class="n" style="color: #333;">mkEqErr1</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ReportErrCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ErrorItem</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;">ErrMsg</span></span>
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1587
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1523
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<pre style="margin: 0;"> <span id="LC1523" class="line" lang="haskell"><span class="n" style="color: #333;">mkEqErr1</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">item</span> <span class="c1" style="color: #998; font-style: italic;">-- Wanted or derived;</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1794" 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="1730" 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">@@ -1794,6 +1730,11 @@ mkTyVarEqErr' dflags ctxt report item oriented tv1 ty2</td>
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1794
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1730
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<pre style="margin: 0;"> <span id="LC1730" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to be helpful since this is just an unimplemented feature.</span></span>
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1795
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1731
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<pre style="margin: 0;"> <span id="LC1731" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mkErrorMsgFromItem</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">item</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">report</span> <span class="p">{</span> <span class="n" style="color: #333;">report_important</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="n" style="color: #333;">msg</span><span class="p">]</span> <span class="p">}</span> <span class="p">}</span></span>
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1796
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1732
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<pre style="margin: 0;"> <span id="LC1732" class="line" lang="haskell"></span>
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1733
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<pre style="margin: 0;">+<span id="LC1733" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This is wrinkle (4) in Note [Equalities with incompatible kinds] in</span></span>
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1734
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<pre style="margin: 0;">+<span id="LC1734" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- GHC.Tc.Solver.Canonical</span></span>
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1735
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<pre style="margin: 0;">+<span id="LC1735" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">MTVU_HoleBlocker</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">occ_check_expand</span></span>
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1736
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<pre style="margin: 0;">+<span id="LC1736" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkBlockedEqErr</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">item</span></span>
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1737
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<pre style="margin: 0;">+<span id="LC1737" class="line" lang="haskell"></span>
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1797
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1738
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<pre style="margin: 0;"> <span id="LC1738" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If the immediately-enclosing implication has 'tv' a skolem, and</span></span>
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1798
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1739
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<pre style="margin: 0;"> <span id="LC1739" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we know by now its an InferSkol kind of skolem, then presumably</span></span>
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1799
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1740
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<pre style="margin: 0;"> <span id="LC1740" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- it started life as a TyVarTv, else it'd have been unified, given</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">@@ -1945,8 +1886,8 @@ pp_givens givens</td>
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1945
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1886
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<pre style="margin: 0;"> <span id="LC1886" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- always be another unsolved wanted around, which will ordinarily suppress</span></span>
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1946
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1887
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<pre style="margin: 0;"> <span id="LC1887" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- this message. But this can still be printed out with -fdefer-type-errors</span></span>
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1947
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1888
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<pre style="margin: 0;"> <span id="LC1888" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (sigh), so we must produce a message.</span></span>
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1948
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<pre style="margin: 0;">-<span id="LC1948" class="line" lang="haskell"><span class="n" style="color: #333;">mkBlockedEqErr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ReportErrCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="p"><span class="idiff left">[</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">ErrorItem</span></span><span class="p"><span class="idiff right">]</span></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;">ErrMsg</span></span>
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1949
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<pre style="margin: 0;">-<span id="LC1949" class="line" lang="haskell"><span class="n" style="color: #333;">mkBlockedEqErr</span> <span class="n" style="color: #333;">ctxt</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">item</span></span><span class="o" style="font-weight: 600;"><span class="idiff">:</span></span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="p"><span class="idiff right">)</span></span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkErrorMsgFromItem</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">item</span> <span class="n" style="color: #333;">report</span></span>
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1889
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<pre style="margin: 0;">+<span id="LC1889" class="line" lang="haskell"><span class="n" style="color: #333;">mkBlockedEqErr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ReportErrCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">ErrorItem</span></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;">ErrMsg</span></span>
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<pre style="margin: 0;">+<span id="LC1890" class="line" lang="haskell"><span class="n" style="color: #333;">mkBlockedEqErr</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;"><span class="idiff left right">item</span></span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkErrorMsgFromItem</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">item</span> <span class="n" style="color: #333;">report</span></span>
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1950
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1891
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<pre style="margin: 0;"> <span id="LC1891" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1951
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1892
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<pre style="margin: 0;"> <span id="LC1892" class="line" lang="haskell"> <span class="n" style="color: #333;">report</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">important</span> <span class="n" style="color: #333;">msg</span></span>
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1952
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1893
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<pre style="margin: 0;"> <span id="LC1893" class="line" lang="haskell"> <span class="n" style="color: #333;">msg</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Cannot use equality for substitution:"</span><span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1956" 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="1897" 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">@@ -1956,7 +1897,6 @@ mkBlockedEqErr ctxt (item:_) = mkErrorMsgFromItem ctxt item report</td>
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1956
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1897
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<pre style="margin: 0;"> <span id="LC1897" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- has -fprint-explicit-kinds on, they will see that the two</span></span>
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1957
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1898
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<pre style="margin: 0;"> <span id="LC1898" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- sides have the same kind, as there is an invisible cast.</span></span>
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1958
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1899
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<pre style="margin: 0;"> <span id="LC1899" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- I really don't know how to do better.</span></span>
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1959
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<pre style="margin: 0;">-<span id="LC1959" class="line" lang="haskell"><span class="n" style="color: #333;">mkBlockedEqErr</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"mkBlockedEqErr no constraints"</span></span>
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1960
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1900
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<pre style="margin: 0;"> <span id="LC1900" class="line" lang="haskell"></span>
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1961
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1901
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<pre style="margin: 0;"> <span id="LC1901" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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1962
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1902
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<pre style="margin: 0;"> <span id="LC1902" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Suppress redundant givens during error reporting]</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2430" 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">@@ -2490,7 +2430,7 @@ Warn of loopy local equalities that were dropped.</td>
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2490
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2430
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<pre style="margin: 0;"> <span id="LC2430" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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2491
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2431
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<pre style="margin: 0;"> <span id="LC2431" class="line" lang="haskell"></span>
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2492
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2432
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<pre style="margin: 0;"> <span id="LC2432" class="line" lang="haskell"><span class="n" style="color: #333;">mkDictErr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ReportErrCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">ErrorItem</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="kt" style="color: #458; font-weight: 600;">ErrMsg</span></span>
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2493
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<pre style="margin: 0;">-<span id="LC2493" class="line" lang="haskell"><span class="n" style="color: #333;">mkDictErr</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">items</span></span>
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2433
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<pre style="margin: 0;">+<span id="LC2433" class="line" lang="haskell"><span class="n" style="color: #333;">mkDictErr</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;"><span class="idiff left right">orig_</span>items</span></span>
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2494
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2434
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<pre style="margin: 0;"> <span id="LC2434" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">items</span><span class="p">)</span> <span class="p">)</span></span>
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2495
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2435
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<pre style="margin: 0;"> <span id="LC2435" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">inst_envs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcGetInstEnvs</span></span>
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2496
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2436
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<pre style="margin: 0;"> <span id="LC2436" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">item1</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;">items</span> <span class="c1" style="color: #998; font-style: italic;">-- ct1 just for its location</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2446" 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">@@ -2506,6 +2446,11 @@ mkDictErr ctxt items</td>
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2506
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2446
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<pre style="margin: 0;"> <span id="LC2446" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">ctxt</span><span class="p">,</span> <span class="n" style="color: #333;">err</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mk_dict_err</span> <span class="n" style="color: #333;">ctxt</span> <span class="p">(</span><span class="n" style="color: #333;">head</span> <span class="p">(</span><span class="n" style="color: #333;">no_inst_items</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">overlap_items</span><span class="p">))</span></span>
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2447
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<pre style="margin: 0;"> <span id="LC2447" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mkErrorMsgFromItem</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">item1</span> <span class="p">(</span><span class="n" style="color: #333;">important</span> <span class="n" style="color: #333;">err</span><span class="p">)</span> <span class="p">}</span></span>
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2448
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<pre style="margin: 0;"> <span id="LC2448" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2449
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<pre style="margin: 0;">+<span id="LC2449" class="line" lang="haskell"> <span class="n" style="color: #333;">filtered_items</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filter</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">ei_suppress</span><span class="p">)</span> <span class="n" style="color: #333;">orig_items</span></span>
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2450
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<pre style="margin: 0;">+<span id="LC2450" class="line" lang="haskell"> <span class="n" style="color: #333;">items</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">filtered_items</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">orig_items</span> <span class="c1" style="color: #998; font-style: italic;">-- all suppressed, but must report</span></span>
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2451
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<pre style="margin: 0;">+<span id="LC2451" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- something for -fdefer-type-errors</span></span>
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2452
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<pre style="margin: 0;">+<span id="LC2452" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filtered_items</span> <span class="c1" style="color: #998; font-style: italic;">-- common case</span></span>
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<pre style="margin: 0;">+<span id="LC2453" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2454" class="line" lang="haskell"> <span class="n" style="color: #333;">no_givens</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">null</span> <span class="p">(</span><span class="n" style="color: #333;">getUserGivens</span> <span class="n" style="color: #333;">ctxt</span><span class="p">)</span></span>
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2455
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<pre style="margin: 0;"> <span id="LC2455" class="line" lang="haskell"></span>
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2456
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<pre style="margin: 0;"> <span id="LC2456" class="line" lang="haskell"> <span class="n" style="color: #333;">is_no_inst</span> <span class="p">(</span><span class="n" style="color: #333;">item</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">matches</span><span class="p">,</span> <span class="n" style="color: #333;">unifiers</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">))</span></span>
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<li id="9355bef855426caf5f526925edf351b20f9a86c4">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/f5433f0bc06f65deb96a44b62d47875ec4bc5b38...5d3804aec65f0801363c28ca3bb8a15f4ef3e6db#9355bef855426caf5f526925edf351b20f9a86c4"><strong>compiler/GHC/Tc/Gen/HsType.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="48" 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">@@ -48,7 +48,6 @@ module GHC.Tc.Gen.HsType (</td>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcHsLiftedTypeNC</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcHsOpenTypeNC</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcLHsType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcLHsTypeUnsaturated</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcCheckLHsType</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcHsMbContext</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcHsContext</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcLHsPredType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcInferApps</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC51" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">failIfEmitsConstraints</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">solveEqualities</span><span class="p">,</span> <span class="c1" style="color: #998; font-style: italic;">-- useful re-export</span></span>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">typeLevelMode</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">kindLevelMode</span><span class="p">,</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="83" 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">@@ -84,7 +83,6 @@ import GHC.Tc.Solver</td>
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84
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<pre style="margin: 0;"> <span id="LC83" 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>
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<pre style="margin: 0;"> <span id="LC84" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCo.Rep</span></span>
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<pre style="margin: 0;"> <span id="LC85" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCo.Ppr</span></span>
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87
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<pre style="margin: 0;">-<span id="LC87" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Errors</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">reportAllUnsolved</span> <span class="p">)</span></span>
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88
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86
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<pre style="margin: 0;"> <span id="LC86" 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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89
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<pre style="margin: 0;"> <span id="LC87" 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;">tcInstInvisibleTyBinders</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcInstInvisibleTyBinder</span> <span class="p">)</span></span>
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88
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<pre style="margin: 0;"> <span id="LC88" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Type</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -3513,19 +3511,6 @@ promotionErr name err</td>
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3513
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3511
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<pre style="margin: 0;"> <span id="LC3511" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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3514
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3512
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<pre style="margin: 0;"> <span id="LC3512" class="line" lang="haskell"></span>
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3515
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3513
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<pre style="margin: 0;"> <span id="LC3513" class="line" lang="haskell"></span>
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3516
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<pre style="margin: 0;">-<span id="LC3516" class="line" lang="haskell"><span class="cd">-- | If the inner action emits constraints, report them as errors and fail;</span></span>
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3517
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<pre style="margin: 0;">-<span id="LC3517" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- otherwise, propagates the return value. Useful as a wrapper around</span></span>
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3518
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<pre style="margin: 0;">-<span id="LC3518" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'tcImplicitTKBndrs', which uses solveLocalEqualities, when there won't be</span></span>
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3519
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<pre style="margin: 0;">-<span id="LC3519" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- another chance to solve constraints</span></span>
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3520
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<pre style="margin: 0;">-<span id="LC3520" class="line" lang="haskell"><span class="n" style="color: #333;">failIfEmitsConstraints</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcM</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;">TcM</span> <span class="n" style="color: #333;">a</span></span>
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3521
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<pre style="margin: 0;">-<span id="LC3521" class="line" lang="haskell"><span class="n" style="color: #333;">failIfEmitsConstraints</span> <span class="n" style="color: #333;">thing_inside</span></span>
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3522
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<pre style="margin: 0;">-<span id="LC3522" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">checkNoErrs</span> <span class="o" style="font-weight: 600;">$</span> <span class="c1" style="color: #998; font-style: italic;">-- We say that we fail if there are constraints!</span></span>
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3523
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<pre style="margin: 0;">-<span id="LC3523" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- c.f same checkNoErrs in solveEqualities</span></span>
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3524
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<pre style="margin: 0;">-<span id="LC3524" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">res</span><span class="p">,</span> <span class="n" style="color: #333;">lie</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">captureConstraints</span> <span class="n" style="color: #333;">thing_inside</span></span>
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3525
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<pre style="margin: 0;">-<span id="LC3525" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">reportAllUnsolved</span> <span class="n" style="color: #333;">lie</span></span>
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3526
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<pre style="margin: 0;">-<span id="LC3526" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">res</span></span>
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3527
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<pre style="margin: 0;">-<span id="LC3527" class="line" lang="haskell"> <span class="p">}</span></span>
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3528
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<pre style="margin: 0;">-<span id="LC3528" class="line" lang="haskell"></span>
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3529
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<pre style="margin: 0;"> <span id="LC3514" class="line" lang="haskell"><span class="cd">-- | Make an appropriate message for an error in a function argument.</span></span>
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<pre style="margin: 0;"> <span id="LC3515" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Used for both expressions and types.</span></span>
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<pre style="margin: 0;"> <span id="LC3516" class="line" lang="haskell"><span class="n" style="color: #333;">funAppCtxt</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="n" style="color: #333;">fun</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="n" style="color: #333;">arg</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=></span> <span class="n" style="color: #333;">fun</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">arg</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/f5433f0bc06f65deb96a44b62d47875ec4bc5b38...5d3804aec65f0801363c28ca3bb8a15f4ef3e6db#54436e21ea530a66a8a71bcc01c836f4740b8f02"><strong>compiler/GHC/Tc/Solver.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -814,7 +814,7 @@ simplifyInfer rhs_tclvl infer_mode sigs name_taus wanteds</td>
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<pre style="margin: 0;"> <span id="LC814" class="line" lang="haskell"> <span class="p">,</span> <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;">psig_theta_var</span></span>
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<pre style="margin: 0;"> <span id="LC815" class="line" lang="haskell"> <span class="p">,</span> <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>
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<pre style="margin: 0;"> <span id="LC816" 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;">ct_loc</span></span>
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<pre style="margin: 0;">-<span id="LC817" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_re<span class="idiff left">port_as</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">CtReportAsSame</span></span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC817" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_re<span class="idiff left">writers</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 right">emptyRewriterSet</span></span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC818" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">psig_theta_var</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">psig_theta_vars</span> <span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC819" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC820" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Now construct the residual constraint</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">@@ -2647,13 +2647,12 @@ disambigGroup (default_ty:default_tys) group@(the_tv, wanteds)</td>
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<pre style="margin: 0;"> <span id="LC2647" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">lcl_env</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">getLclEnv</span></span>
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<pre style="margin: 0;"> <span id="LC2648" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tc_lvl</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">getTcLevel</span></span>
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<pre style="margin: 0;"> <span id="LC2649" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkGivenLoc</span> <span class="n" style="color: #333;">tc_lvl</span> <span class="kt" style="color: #458; font-weight: 600;">UnkSkol</span> <span class="n" style="color: #333;">lcl_env</span></span>
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<pre style="margin: 0;">-<span id="LC2650" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">wanted_evs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">sequence</span> <span class="p">[</span> <span class="n" style="color: #333;">newWantedEvVarNC</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">port_as'</span></span> <span class="n" style="color: #333;">pred'</span></span>
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<pre style="margin: 0;">+<span id="LC2650" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">wanted_evs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">sequence</span> <span class="p">[</span> <span class="n" style="color: #333;">newWantedEvVarNC</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">writers</span></span> <span class="n" style="color: #333;">pred'</span></span>
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<pre style="margin: 0;"> <span id="LC2651" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">wanted</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">wanteds</span></span>
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<pre style="margin: 0;"> <span id="LC2652" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <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;">pred</span></span>
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<pre style="margin: 0;">-<span id="LC2653" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_re<span class="idiff left">port_as</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 right">report_a</span>s</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC2653" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_re<span class="idiff left">writers</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 right">rewriter</span>s</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC2654" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvidence</span> <span class="n" style="color: #333;">wanted</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC2655" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">pred'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substTy</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">pred</span></span>
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<pre style="margin: 0;">-<span id="LC2656" class="line" lang="haskell"> <span class="n" style="color: #333;">report_as'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substCtReportAs</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">report_as</span> <span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC2655" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">pred'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substTy</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">pred</span> <span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC2656" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">fmap</span> <span class="n" style="color: #333;">isEmptyWC</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC2657" class="line" lang="haskell"> <span class="n" style="color: #333;">solveSimpleWanteds</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">listToBag</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC2658" class="line" lang="haskell"> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">mkNonCanonical</span> <span class="n" style="color: #333;">wanted_evs</span> <span class="p">}</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/f5433f0bc06f65deb96a44b62d47875ec4bc5b38...5d3804aec65f0801363c28ca3bb8a15f4ef3e6db#f018e77421f495c6f75733fee4a511cfe57bebe8"><strong>compiler/GHC/Tc/Solver/Canonical.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -3,7 +3,7 @@</td>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.Tc.Solver.Canonical</span><span class="p">(</span></span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="haskell"> <span class="n" style="color: #333;">canonicalize</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="haskell"> <span class="n" style="color: #333;">unify<span class="idiff left right">Deriv</span>ed</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"> <span class="n" style="color: #333;">unify<span class="idiff left right">Want</span>ed</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="haskell"> <span class="n" style="color: #333;">makeSuperClasses</span><span class="p">,</span> <span class="n" style="color: #333;">maybeSym</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">StopOrContinue</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="n" style="color: #333;">stopWith</span><span class="p">,</span> <span class="n" style="color: #333;">continueWith</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="haskell"> <span class="n" style="color: #333;">solveCallStack</span> <span class="c1" style="color: #998; font-style: italic;">-- For GHC.Tc.Solver</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">@@ -154,7 +154,7 @@ canClassNC ev cls tys</td>
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<pre style="margin: 0;"> <span id="LC154" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">emitWork</span> <span class="n" style="color: #333;">sc_cts</span></span>
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<pre style="margin: 0;"> <span id="LC155" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">canClass</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">cls</span> <span class="n" style="color: #333;">tys</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC156" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC157" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_re<span class="idiff left">port_as</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 right">report_a</span>s</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ev</span></span>
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157
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<pre style="margin: 0;">+<span id="LC157" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_re<span class="idiff left">writers</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 right">rewriter</span>s</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ev</span></span>
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158
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158
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<pre style="margin: 0;"> <span id="LC158" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">ip_name</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">isCallStackPred</span> <span class="n" style="color: #333;">cls</span> <span class="n" style="color: #333;">tys</span></span>
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159
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159
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<pre style="margin: 0;"> <span id="LC159" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">OccurrenceOf</span> <span class="n" style="color: #333;">func</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ctLocOrigin</span> <span class="n" style="color: #333;">loc</span></span>
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160
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160
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<pre style="margin: 0;"> <span id="LC160" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If we're given a CallStack constraint that arose from a function</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="169" 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="169" 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">@@ -169,7 +169,7 @@ canClassNC ev cls tys</td>
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169
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169
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<pre style="margin: 0;"> <span id="LC169" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- this rule does not fire again.</span></span>
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170
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170
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<pre style="margin: 0;"> <span id="LC170" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Overview of implicit CallStacks]</span></span>
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171
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171
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<pre style="margin: 0;"> <span id="LC171" class="line" lang="haskell"></span>
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172
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<pre style="margin: 0;">-<span id="LC172" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">new_ev</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newWantedEvVarNC</span> <span class="n" style="color: #333;">new_loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">port_a</span>s</span> <span class="n" style="color: #333;">pred</span></span>
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172
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<pre style="margin: 0;">+<span id="LC172" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">new_ev</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newWantedEvVarNC</span> <span class="n" style="color: #333;">new_loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">writer</span>s</span> <span class="n" style="color: #333;">pred</span></span>
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173
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173
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<pre style="margin: 0;"> <span id="LC173" class="line" lang="haskell"></span>
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174
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174
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<pre style="margin: 0;"> <span id="LC174" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Then we solve the wanted by pushing the call-site</span></span>
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175
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175
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<pre style="margin: 0;"> <span id="LC175" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- onto the newly emitted CallStack</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">@@ -205,7 +205,7 @@ canClass :: CtEvidence</td>
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205
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205
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<pre style="margin: 0;"> <span id="LC205" class="line" lang="haskell"><span class="n" style="color: #333;">canClass</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">cls</span> <span class="n" style="color: #333;">tys</span> <span class="n" style="color: #333;">pend_sc</span></span>
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206
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206
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<pre style="margin: 0;"> <span id="LC206" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- all classes do *nominal* matching</span></span>
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207
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<pre style="margin: 0;"> <span id="LC207" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ASSERT2</span><span class="p">(</span> <span class="n" style="color: #333;">ctEvRole</span> <span class="n" style="color: #333;">ev</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ev</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">cls</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tys</span> <span class="p">)</span></span>
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208
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<pre style="margin: 0;">-<span id="LC208" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">xis</span><span class="p">,</span> <span class="n" style="color: #333;">cos</span><span class="p">,</span> <span class="n" style="color: #333;">_kind_co</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left right">wrw</span></span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">flattenArgsNom</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">cls_tc</span> <span class="n" style="color: #333;">tys</span></span>
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208
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<pre style="margin: 0;">+<span id="LC208" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">xis</span><span class="p">,</span> <span class="n" style="color: #333;">cos</span><span class="p">,</span> <span class="n" style="color: #333;">_kind_co</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left right">rewriters</span></span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">flattenArgsNom</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">cls_tc</span> <span class="n" style="color: #333;">tys</span></span>
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209
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209
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<pre style="margin: 0;"> <span id="LC209" class="line" lang="haskell"> <span class="p">;</span> <span class="kt" style="color: #458; font-weight: 600;">MASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">isTcReflCo</span> <span class="n" style="color: #333;">_kind_co</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC210" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTcTyConAppCo</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">cls_tc</span> <span class="n" style="color: #333;">cos</span></span>
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<pre style="margin: 0;"> <span id="LC211" class="line" lang="haskell"> <span class="n" style="color: #333;">xi</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkClassPred</span> <span class="n" style="color: #333;">cls</span> <span class="n" style="color: #333;">xis</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">@@ -213,7 +213,7 @@ canClass ev cls tys pend_sc</td>
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213
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<pre style="margin: 0;"> <span id="LC213" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cc_tyargs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">xis</span></span>
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214
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<pre style="margin: 0;"> <span id="LC214" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cc_class</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cls</span></span>
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215
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<pre style="margin: 0;"> <span id="LC215" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cc_pend_sc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pend_sc</span> <span class="p">}</span></span>
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216
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<pre style="margin: 0;">-<span id="LC216" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mb</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rewriteEvidence</span> <span class="n" style="color: #333;"><span class="idiff left right">wrw</span></span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">xi</span> <span class="n" style="color: #333;">co</span></span>
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216
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<pre style="margin: 0;">+<span id="LC216" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mb</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rewriteEvidence</span> <span class="n" style="color: #333;"><span class="idiff left right">rewriters</span></span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">xi</span> <span class="n" style="color: #333;">co</span></span>
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217
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<pre style="margin: 0;"> <span id="LC217" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"canClass"</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ev</span></span>
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<pre style="margin: 0;"> <span id="LC218" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">xi</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">mb</span> <span class="p">])</span></span>
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<pre style="margin: 0;"> <span id="LC219" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">fmap</span> <span class="n" style="color: #333;">mk_ct</span> <span class="n" style="color: #333;">mb</span><span class="p">)</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">@@ -598,7 +598,7 @@ mk_strict_superclasses rec_clss ev tvs theta cls tys</td>
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598
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<pre style="margin: 0;"> <span id="LC598" 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;">ctEvLoc</span> <span class="n" style="color: #333;">ev</span></span>
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599
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599
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<pre style="margin: 0;"> <span id="LC599" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC600" class="line" lang="haskell"> <span class="n" style="color: #333;">do_one_derived</span> <span class="n" style="color: #333;">sc_pred</span></span>
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601
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<pre style="margin: 0;">-<span id="LC601" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">sc_ev</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newDerivedNC</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">sc_pred</span></span>
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<pre style="margin: 0;">+<span id="LC601" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">sc_ev</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newDerivedNC</span> <span class="n" style="color: #333;">loc</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">ctEvRewriters</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ev</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">sc_pred</span></span>
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602
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<pre style="margin: 0;"> <span id="LC602" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mk_superclasses</span> <span class="n" style="color: #333;">rec_clss</span> <span class="n" style="color: #333;">sc_ev</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">sc_pred</span> <span class="p">}</span></span>
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603
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<pre style="margin: 0;"> <span id="LC603" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC604" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Improvement from Ground Wanteds]</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="705" 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="705" 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">@@ -705,8 +705,8 @@ canIrred :: CtIrredStatus -> CtEvidence -> TcS (StopOrContinue Ct)</td>
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<pre style="margin: 0;"> <span id="LC705" class="line" lang="haskell"><span class="n" style="color: #333;">canIrred</span> <span class="n" style="color: #333;">status</span> <span class="n" style="color: #333;">ev</span></span>
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<pre style="margin: 0;"> <span id="LC706" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctEvPred</span> <span class="n" style="color: #333;">ev</span></span>
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<pre style="margin: 0;"> <span id="LC707" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"can_pred"</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"IrredPred = "</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">pred</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC708" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">xi</span><span class="p">,</span><span class="n" style="color: #333;">co</span><span class="p">,</span><span class="n" style="color: #333;"><span class="idiff left right">wrw</span></span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">flatten</span> <span class="kt" style="color: #458; font-weight: 600;">FM_FlattenAll</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">pred</span> <span class="c1" style="color: #998; font-style: italic;">-- co :: xi ~ pred</span></span>
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<pre style="margin: 0;">-<span id="LC709" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rewriteEvidence</span> <span class="n" style="color: #333;"><span class="idiff left right">wrw</span></span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">xi</span> <span class="n" style="color: #333;">co</span> <span class="p">`</span><span class="n" style="color: #333;">andWhenContinue</span><span class="p">`</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">new_ev</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC708" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">xi</span><span class="p">,</span><span class="n" style="color: #333;">co</span><span class="p">,</span><span class="n" style="color: #333;"><span class="idiff left right">rewriters</span></span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">flatten</span> <span class="kt" style="color: #458; font-weight: 600;">FM_FlattenAll</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">pred</span> <span class="c1" style="color: #998; font-style: italic;">-- co :: xi ~ pred</span></span>
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<pre style="margin: 0;">+<span id="LC709" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rewriteEvidence</span> <span class="n" style="color: #333;"><span class="idiff left right">rewriters</span></span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">xi</span> <span class="n" style="color: #333;">co</span> <span class="p">`</span><span class="n" style="color: #333;">andWhenContinue</span><span class="p">`</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">new_ev</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;"> <span id="LC710" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="c1" style="color: #998; font-style: italic;">-- Re-classify, in case flattening has improved its shape</span></span>
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<pre style="margin: 0;"> <span id="LC711" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">classifyPredType</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvPred</span> <span class="n" style="color: #333;">new_ev</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC712" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ClassPred</span> <span class="n" style="color: #333;">cls</span> <span class="n" style="color: #333;">tys</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">canClassNC</span> <span class="n" style="color: #333;">new_ev</span> <span class="n" style="color: #333;">cls</span> <span class="n" style="color: #333;">tys</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">@@ -815,8 +815,8 @@ canForAll ev pend_sc</td>
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<pre style="margin: 0;"> <span id="LC815" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- do them under a forall anyway (c.f. Flatten.flatten_one</span></span>
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<pre style="margin: 0;"> <span id="LC816" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- on a forall type)</span></span>
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<pre style="margin: 0;"> <span id="LC817" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctEvPred</span> <span class="n" style="color: #333;">ev</span></span>
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<pre style="margin: 0;">-<span id="LC818" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">xi</span><span class="p">,</span><span class="n" style="color: #333;">co</span><span class="p">,</span><span class="n" style="color: #333;"><span class="idiff left right">wrw</span></span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">flatten</span> <span class="kt" style="color: #458; font-weight: 600;">FM_SubstOnly</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">pred</span> <span class="c1" style="color: #998; font-style: italic;">-- co :: xi ~ pred</span></span>
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<pre style="margin: 0;">-<span id="LC819" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rewriteEvidence</span> <span class="n" style="color: #333;"><span class="idiff left right">wrw</span></span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">xi</span> <span class="n" style="color: #333;">co</span> <span class="p">`</span><span class="n" style="color: #333;">andWhenContinue</span><span class="p">`</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">new_ev</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC818" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">xi</span><span class="p">,</span><span class="n" style="color: #333;">co</span><span class="p">,</span><span class="n" style="color: #333;"><span class="idiff left right">rewriters</span></span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">flatten</span> <span class="kt" style="color: #458; font-weight: 600;">FM_SubstOnly</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">pred</span> <span class="c1" style="color: #998; font-style: italic;">-- co :: xi ~ pred</span></span>
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<pre style="margin: 0;">+<span id="LC819" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rewriteEvidence</span> <span class="n" style="color: #333;"><span class="idiff left right">rewriters</span></span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">xi</span> <span class="n" style="color: #333;">co</span> <span class="p">`</span><span class="n" style="color: #333;">andWhenContinue</span><span class="p">`</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">new_ev</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;"> <span id="LC820" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC821" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="c1" style="color: #998; font-style: italic;">-- Now decompose into its pieces and solve it</span></span>
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<pre style="margin: 0;"> <span id="LC822" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (It takes a lot less code to flatten before decomposing.)</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">@@ -829,7 +829,7 @@ canForAll ev pend_sc</td>
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<pre style="margin: 0;"> <span id="LC829" class="line" lang="haskell"><span class="n" style="color: #333;">solveForAll</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcThetaType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PredType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<pre style="margin: 0;"> <span id="LC830" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StopOrContinue</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC831" class="line" lang="haskell"><span class="n" style="color: #333;">solveForAll</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">theta</span> <span class="n" style="color: #333;">pred</span> <span class="n" style="color: #333;">pend_sc</span></span>
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<pre style="margin: 0;">-<span id="LC832" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_dest</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dest</span><span class="p">,</span> <span class="n" style="color: #333;">ctev_re<span class="idiff left">port_as</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 right">report_a</span>s</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ev</span></span>
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<pre style="margin: 0;">+<span id="LC832" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_dest</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dest</span><span class="p">,</span> <span class="n" style="color: #333;">ctev_re<span class="idiff left">writers</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 right">rewriter</span>s</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ev</span></span>
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<pre style="margin: 0;"> <span id="LC833" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Solving a Wanted forall-constraint]</span></span>
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834
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<pre style="margin: 0;"> <span id="LC834" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">skol_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">QuantCtxtSkol</span></span>
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835
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<pre style="margin: 0;"> <span id="LC835" 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="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkInScopeSet</span> <span class="o" style="font-weight: 600;">$</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">@@ -839,7 +839,7 @@ solveForAll ev tvs theta pred pend_sc</td>
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<pre style="margin: 0;"> <span id="LC839" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC840" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">lvl</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">w_id</span><span class="p">,</span> <span class="n" style="color: #333;">wanteds</span><span class="p">))</span></span>
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841
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841
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<pre style="margin: 0;"> <span id="LC841" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pushLevelNoWorkList</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">skol_info</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC842" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">wanted_ev</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newWantedEvVarNC</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">port_a</span>s</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC842" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">wanted_ev</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newWantedEvVarNC</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">writer</span>s</span> <span class="o" style="font-weight: 600;">$</span></span>
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843
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<pre style="margin: 0;"> <span id="LC843" class="line" lang="haskell"> <span class="n" style="color: #333;">substTy</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">pred</span></span>
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844
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<pre style="margin: 0;"> <span id="LC844" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span> <span class="n" style="color: #333;">ctEvEvId</span> <span class="n" style="color: #333;">wanted_ev</span></span>
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845
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845
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<pre style="margin: 0;"> <span id="LC845" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">unitBag</span> <span class="p">(</span><span class="n" style="color: #333;">mkNonCanonical</span> <span class="n" style="color: #333;">wanted_ev</span><span class="p">))</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">@@ -1030,9 +1030,9 @@ can_eq_nc' True _rdr_env _envs ev eq_rel ty1 _ (AppTy t2 s2) _</td>
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<pre style="margin: 0;"> <span id="LC1030" class="line" lang="haskell"></span>
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1031
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1031
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<pre style="margin: 0;"> <span id="LC1031" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- No similarity in type structure detected. Flatten and try again.</span></span>
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1032
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1032
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<pre style="margin: 0;"> <span id="LC1032" class="line" lang="haskell"><span class="n" style="color: #333;">can_eq_nc'</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="n" style="color: #333;">rdr_env</span> <span class="n" style="color: #333;">envs</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">eq_rel</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ps_ty1</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">ps_ty2</span></span>
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1033
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<pre style="margin: 0;">-<span id="LC1033" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">xi1</span><span class="p">,</span> <span class="n" style="color: #333;">co1</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left right">wrw</span>1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">flatten</span> <span class="kt" style="color: #458; font-weight: 600;">FM_FlattenAll</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">ps_ty1</span></span>
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1034
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<pre style="margin: 0;">-<span id="LC1034" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">xi2</span><span class="p">,</span> <span class="n" style="color: #333;">co2</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left right">wrw</span>2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">flatten</span> <span class="kt" style="color: #458; font-weight: 600;">FM_FlattenAll</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">ps_ty2</span></span>
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1035
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<pre style="margin: 0;">-<span id="LC1035" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">new_ev</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rewriteEqEvidence</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">wrw1</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">S</span></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 right">wrw</span>2</span><span class="p">)</span> <span class="n" style="color: #333;">ev</span> <span class="kt" style="color: #458; font-weight: 600;">NotSwapped</span> <span class="n" style="color: #333;">xi1</span> <span class="n" style="color: #333;">xi2</span> <span class="n" style="color: #333;">co1</span> <span class="n" style="color: #333;">co2</span></span>
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1033
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<pre style="margin: 0;">+<span id="LC1033" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">xi1</span><span class="p">,</span> <span class="n" style="color: #333;">co1</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left right">rewriters</span>1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">flatten</span> <span class="kt" style="color: #458; font-weight: 600;">FM_FlattenAll</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">ps_ty1</span></span>
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1034
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<pre style="margin: 0;">+<span id="LC1034" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">xi2</span><span class="p">,</span> <span class="n" style="color: #333;">co2</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left right">rewriters</span>2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">flatten</span> <span class="kt" style="color: #458; font-weight: 600;">FM_FlattenAll</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">ps_ty2</span></span>
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1035
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<pre style="margin: 0;">+<span id="LC1035" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">new_ev</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rewriteEqEvidence</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">rewriters1</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">S</span></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 right">rewriters</span>2</span><span class="p">)</span> <span class="n" style="color: #333;">ev</span> <span class="kt" style="color: #458; font-weight: 600;">NotSwapped</span> <span class="n" style="color: #333;">xi1</span> <span class="n" style="color: #333;">xi2</span> <span class="n" style="color: #333;">co1</span> <span class="n" style="color: #333;">co2</span></span>
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1036
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1036
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<pre style="margin: 0;"> <span id="LC1036" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">can_eq_nc'</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="n" style="color: #333;">rdr_env</span> <span class="n" style="color: #333;">envs</span> <span class="n" style="color: #333;">new_ev</span> <span class="n" style="color: #333;">eq_rel</span> <span class="n" style="color: #333;">xi1</span> <span class="n" style="color: #333;">xi1</span> <span class="n" style="color: #333;">xi2</span> <span class="n" style="color: #333;">xi2</span> <span class="p">}</span></span>
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1037
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1037
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<pre style="margin: 0;"> <span id="LC1037" class="line" lang="haskell"></span>
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1038
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1038
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<pre style="margin: 0;"> <span id="LC1038" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We've flattened and the types don't match. Give up.</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">@@ -1066,7 +1066,7 @@ can_eq_nc_forall :: CtEvidence -> EqRel</td>
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1066
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1066
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<pre style="margin: 0;"> <span id="LC1066" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- so we must proceed one binder at a time (#13879)</span></span>
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1067
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1067
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<pre style="margin: 0;"> <span id="LC1067" class="line" lang="haskell"></span>
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1068
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1068
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<pre style="margin: 0;"> <span id="LC1068" class="line" lang="haskell"><span class="n" style="color: #333;">can_eq_nc_forall</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">eq_rel</span> <span class="n" style="color: #333;">s1</span> <span class="n" style="color: #333;">s2</span></span>
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1069
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<pre style="margin: 0;">-<span id="LC1069" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <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 class="p">,</span> <span class="n" style="color: #333;">ctev_dest</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">orig_dest</span><span class="p">,</span> <span class="n" style="color: #333;">ctev_re<span class="idiff left">port_as</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 right">report_a</span>s</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ev</span></span>
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<pre style="margin: 0;">+<span id="LC1069" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <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 class="p">,</span> <span class="n" style="color: #333;">ctev_dest</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">orig_dest</span><span class="p">,</span> <span class="n" style="color: #333;">ctev_re<span class="idiff left">writers</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 right">rewriter</span>s</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ev</span></span>
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1070
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1070
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<pre style="margin: 0;"> <span id="LC1070" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">free_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyCoVarsOfTypes</span> <span class="p">[</span><span class="n" style="color: #333;">s1</span><span class="p">,</span><span class="n" style="color: #333;">s2</span><span class="p">]</span></span>
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1071
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1071
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<pre style="margin: 0;"> <span id="LC1071" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">bndrs1</span><span class="p">,</span> <span class="n" style="color: #333;">phi1</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcSplitForAllVarBndrs</span> <span class="n" style="color: #333;">s1</span></span>
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1072
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1072
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<pre style="margin: 0;"> <span id="LC1072" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">bndrs2</span><span class="p">,</span> <span class="n" style="color: #333;">phi2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcSplitForAllVarBndrs</span> <span class="n" style="color: #333;">s2</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">@@ -1090,7 +1090,7 @@ can_eq_nc_forall ev eq_rel s1 s2</td>
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1090
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1090
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<pre style="margin: 0;"> <span id="LC1090" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcCoercion</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Cts</span><span class="p">)</span></span>
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1091
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1091
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<pre style="margin: 0;"> <span id="LC1091" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="n" style="color: #333;">skol_tv</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">skol_tvs</span><span class="p">)</span> <span class="n" style="color: #333;">subst</span> <span class="p">(</span><span class="n" style="color: #333;">bndr2</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">bndrs2</span><span class="p">)</span></span>
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1092
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1092
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<pre style="margin: 0;"> <span id="LC1092" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">tv2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">binderVar</span> <span class="n" style="color: #333;">bndr2</span></span>
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1093
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<pre style="margin: 0;">-<span id="LC1093" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">kind_co</span><span class="p">,</span> <span class="n" style="color: #333;">wanteds1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unify</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">port_a</span>s</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="p">(</span><span class="n" style="color: #333;">tyVarKind</span> <span class="n" style="color: #333;">skol_tv</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="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">kind_co</span><span class="p">,</span> <span class="n" style="color: #333;">wanteds1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unify</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">writer</span>s</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="p">(</span><span class="n" style="color: #333;">tyVarKind</span> <span class="n" style="color: #333;">skol_tv</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1094" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">substTy</span> <span class="n" style="color: #333;">subst</span> <span class="p">(</span><span class="n" style="color: #333;">tyVarKind</span> <span class="n" style="color: #333;">tv2</span><span class="p">))</span></span>
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1095
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1095
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<pre style="margin: 0;"> <span id="LC1095" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">subst'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendTvSubstAndInScope</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tv2</span></span>
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1096
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1096
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<pre style="margin: 0;"> <span id="LC1096" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">mkCastTy</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">skol_tv</span><span class="p">)</span> <span class="n" style="color: #333;">kind_co</span><span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1103" 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>
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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">@@ -1103,7 +1103,7 @@ can_eq_nc_forall ev eq_rel s1 s2</td>
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1103
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1103
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<pre style="margin: 0;"> <span id="LC1103" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Done: unify phi1 ~ phi2</span></span>
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1104
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1104
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<pre style="margin: 0;"> <span id="LC1104" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">bndrs2</span></span>
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1105
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1105
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<pre style="margin: 0;"> <span id="LC1105" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">bndrs2</span> <span class="p">)</span></span>
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1106
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<pre style="margin: 0;">-<span id="LC1106" class="line" lang="haskell"> <span class="n" style="color: #333;">unify</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">port_a</span>s</span> <span class="p">(</span><span class="n" style="color: #333;">eqRelRole</span> <span class="n" style="color: #333;">eq_rel</span><span class="p">)</span> <span class="n" style="color: #333;">phi1'</span> <span class="p">(</span><span class="n" style="color: #333;">substTyUnchecked</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">phi2</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1106" class="line" lang="haskell"> <span class="n" style="color: #333;">unify</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">writer</span>s</span> <span class="p">(</span><span class="n" style="color: #333;">eqRelRole</span> <span class="n" style="color: #333;">eq_rel</span><span class="p">)</span> <span class="n" style="color: #333;">phi1'</span> <span class="p">(</span><span class="n" style="color: #333;">substTyUnchecked</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">phi2</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1107" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1108" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"cna_eq_nc_forall"</span> <span class="c1" style="color: #998; font-style: italic;">-- case (s:ss) []</span></span>
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<pre style="margin: 0;"> <span id="LC1109" 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">@@ -1122,14 +1122,14 @@ can_eq_nc_forall ev eq_rel s1 s2</td>
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<pre style="margin: 0;"> <span id="LC1122" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">stopWith</span> <span class="n" style="color: #333;">ev</span> <span class="s" style="color: #d14;">"Discard given polytype equality"</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1123" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1124" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1125
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<pre style="margin: 0;">-<span id="LC1125" class="line" lang="haskell"> <span class="n" style="color: #333;">unify</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CtReportAs</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Role</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcCoercion</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Cts</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1125" class="line" lang="haskell"> <span class="n" style="color: #333;">unify</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">RewriterSet</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Role</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcCoercion</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Cts</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1126" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This version returns the wanted constraint rather</span></span>
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<pre style="margin: 0;"> <span id="LC1127" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- than putting it in the work list</span></span>
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<pre style="margin: 0;">-<span id="LC1128" class="line" lang="haskell"> <span class="n" style="color: #333;">unify</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">port_a</span>s</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;">+<span id="LC1128" class="line" lang="haskell"> <span class="n" style="color: #333;">unify</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">writer</span>s</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;"> <span id="LC1129" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">ty1</span> <span class="p">`</span><span class="n" style="color: #333;">tcEqType</span><span class="p">`</span> <span class="n" style="color: #333;">ty2</span></span>
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1130
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<pre style="margin: 0;"> <span id="LC1130" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkTcReflCo</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">ty1</span><span class="p">,</span> <span class="n" style="color: #333;">emptyBag</span><span class="p">)</span></span>
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1131
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1131
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<pre style="margin: 0;"> <span id="LC1131" 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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1132
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<pre style="margin: 0;">-<span id="LC1132" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">wanted</span><span class="p">,</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newWantedEq</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">port_a</span>s</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;">+<span id="LC1132" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">wanted</span><span class="p">,</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newWantedEq</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">writer</span>s</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span></span>
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1133
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1133
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<pre style="margin: 0;"> <span id="LC1133" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">co</span><span class="p">,</span> <span class="n" style="color: #333;">unitBag</span> <span class="p">(</span><span class="n" style="color: #333;">mkNonCanonical</span> <span class="n" style="color: #333;">wanted</span><span class="p">))</span> <span class="p">}</span></span>
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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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<pre style="margin: 0;"> <span id="LC1135" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">---------------------------------</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">@@ -1364,7 +1364,7 @@ can_eq_newtype_nc ev swapped ty1 ((gres, co), ty1') ty2 ps_ty2</td>
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<pre style="margin: 0;"> <span id="LC1364" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- module, don't warn about it being unused.</span></span>
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<pre style="margin: 0;"> <span id="LC1365" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Tracking unused binding and imports] in GHC.Tc.Utils.</span></span>
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<pre style="margin: 0;"> <span id="LC1366" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1367" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">new_ev</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rewriteEqEvidence</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">NoWRW</span></span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">swapped</span> <span class="n" style="color: #333;">ty1'</span> <span class="n" style="color: #333;">ps_ty2</span></span>
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<pre style="margin: 0;">+<span id="LC1367" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">new_ev</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rewriteEqEvidence</span> <span class="n" style="color: #333;"><span class="idiff left right">emptyRewriterSet</span></span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">swapped</span> <span class="n" style="color: #333;">ty1'</span> <span class="n" style="color: #333;">ps_ty2</span></span>
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<pre style="margin: 0;"> <span id="LC1368" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">mkTcSymCo</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">mkTcReflCo</span> <span class="kt" style="color: #458; font-weight: 600;">Representational</span> <span class="n" style="color: #333;">ps_ty2</span><span class="p">)</span></span>
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1369
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<pre style="margin: 0;"> <span id="LC1369" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">can_eq_nc</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="n" style="color: #333;">new_ev</span> <span class="kt" style="color: #458; font-weight: 600;">ReprEq</span> <span class="n" style="color: #333;">ty1'</span> <span class="n" style="color: #333;">ty1'</span> <span class="n" style="color: #333;">ty2</span> <span class="n" style="color: #333;">ps_ty2</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1370" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</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">@@ -1387,12 +1387,12 @@ can_eq_app ev s1 t1 s2 t2</td>
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<pre style="margin: 0;"> <span id="LC1387" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">unifyDeriveds</span> <span class="n" style="color: #333;">loc</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Nominal</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span><span class="p">]</span> <span class="p">[</span><span class="n" style="color: #333;">s1</span><span class="p">,</span> <span class="n" style="color: #333;">t1</span><span class="p">]</span> <span class="p">[</span><span class="n" style="color: #333;">s2</span><span class="p">,</span> <span class="n" style="color: #333;">t2</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC1388" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">stopWith</span> <span class="n" style="color: #333;">ev</span> <span class="s" style="color: #d14;">"Decomposed [D] AppTy"</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1389" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1390" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_dest</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dest</span><span class="p">,</span> <span class="n" style="color: #333;">ctev_re<span class="idiff left">port_as</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 right">report_a</span>s</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ev</span></span>
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<pre style="margin: 0;">-<span id="LC1391" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">co_s</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unifyWanted</span> <span class="n" style="color: #333;">re<span class="idiff left right">port_a</span>s</span> <span class="n" style="color: #333;">loc</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">s1</span> <span class="n" style="color: #333;">s2</span></span>
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<pre style="margin: 0;">+<span id="LC1390" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_dest</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dest</span><span class="p">,</span> <span class="n" style="color: #333;">ctev_re<span class="idiff left">writers</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 right">rewriter</span>s</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ev</span></span>
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<pre style="margin: 0;">+<span id="LC1391" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">co_s</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unifyWanted</span> <span class="n" style="color: #333;">re<span class="idiff left right">writer</span>s</span> <span class="n" style="color: #333;">loc</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">s1</span> <span class="n" style="color: #333;">s2</span></span>
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<pre style="margin: 0;"> <span id="LC1392" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">arg_loc</span></span>
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<pre style="margin: 0;"> <span id="LC1393" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isNextArgVisible</span> <span class="n" style="color: #333;">s1</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">loc</span></span>
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1394
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<pre style="margin: 0;"> <span id="LC1394" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">updateCtLocOrigin</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">toInvisibleOrigin</span></span>
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<pre style="margin: 0;">-<span id="LC1395" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">co_t</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unifyWanted</span> <span class="n" style="color: #333;">re<span class="idiff left right">port_a</span>s</span> <span class="n" style="color: #333;">arg_loc</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">t1</span> <span class="n" style="color: #333;">t2</span></span>
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<pre style="margin: 0;">+<span id="LC1395" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">co_t</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unifyWanted</span> <span class="n" style="color: #333;">re<span class="idiff left right">writer</span>s</span> <span class="n" style="color: #333;">arg_loc</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">t1</span> <span class="n" style="color: #333;">t2</span></span>
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<pre style="margin: 0;"> <span id="LC1396" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkAppCo</span> <span class="n" style="color: #333;">co_s</span> <span class="n" style="color: #333;">co_t</span></span>
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<pre style="margin: 0;"> <span id="LC1397" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">setWantedEq</span> <span class="n" style="color: #333;">dest</span> <span class="n" style="color: #333;">co</span></span>
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1398
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1398
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<pre style="margin: 0;"> <span id="LC1398" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">stopWith</span> <span class="n" style="color: #333;">ev</span> <span class="s" style="color: #d14;">"Decomposed [W] AppTy"</span> <span class="p">}</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1440" 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="1440" 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">@@ -1440,7 +1440,7 @@ canEqCast flat ev eq_rel swapped ty1 co1 ty2 ps_ty2</td>
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<pre style="margin: 0;"> <span id="LC1440" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"Decomposing cast"</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ev</span></span>
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<pre style="margin: 0;"> <span id="LC1441" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty1</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"|>"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">co1</span></span>
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1442
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1442
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<pre style="margin: 0;"> <span id="LC1442" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ps_ty2</span> <span class="p">])</span></span>
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1443
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<pre style="margin: 0;">-<span id="LC1443" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">new_ev</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rewriteEqEvidence</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">NoWRW</span></span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">swapped</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ps_ty2</span></span>
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<pre style="margin: 0;">+<span id="LC1443" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">new_ev</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rewriteEqEvidence</span> <span class="n" style="color: #333;"><span class="idiff left right">emptyRewriterSet</span></span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">swapped</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ps_ty2</span></span>
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<pre style="margin: 0;"> <span id="LC1444" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">mkTcGReflRightCo</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">co1</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1445" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">mkTcReflCo</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">ps_ty2</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1446" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">can_eq_nc</span> <span class="n" style="color: #333;">flat</span> <span class="n" style="color: #333;">new_ev</span> <span class="n" style="color: #333;">eq_rel</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span> <span class="n" style="color: #333;">ps_ty2</span> <span class="p">}</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1682" 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>
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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">@@ -1682,11 +1682,11 @@ canDecomposableTyConAppOK ev eq_rel tc tys1 tys2</td>
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1682
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<pre style="margin: 0;"> <span id="LC1682" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CtDerived</span> <span class="p">{}</span></span>
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<pre style="margin: 0;"> <span id="LC1683" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">unifyDeriveds</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">tc_roles</span> <span class="n" style="color: #333;">tys1</span> <span class="n" style="color: #333;">tys2</span></span>
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<pre style="margin: 0;"> <span id="LC1684" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1685" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_dest</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dest</span><span class="p">,</span> <span class="n" style="color: #333;">ctev_re<span class="idiff left">port_as</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 right">report_a</span>s</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1685" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_dest</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dest</span><span class="p">,</span> <span class="n" style="color: #333;">ctev_re<span class="idiff left">writers</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 right">rewriter</span>s</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1686" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- new_locs and tc_roles are both infinite, so</span></span>
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1687
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<pre style="margin: 0;"> <span id="LC1687" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we are guaranteed that cos has the same length</span></span>
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<pre style="margin: 0;"> <span id="LC1688" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- as tys1 and tys2</span></span>
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<pre style="margin: 0;">-<span id="LC1689" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">cos</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zipWith4M</span> <span class="p">(</span><span class="n" style="color: #333;">unifyWanted</span> <span class="n" style="color: #333;">re<span class="idiff left right">port_a</span>s</span><span class="p">)</span> <span class="n" style="color: #333;">new_locs</span> <span class="n" style="color: #333;">tc_roles</span> <span class="n" style="color: #333;">tys1</span> <span class="n" style="color: #333;">tys2</span></span>
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<pre style="margin: 0;">+<span id="LC1689" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">cos</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zipWith4M</span> <span class="p">(</span><span class="n" style="color: #333;">unifyWanted</span> <span class="n" style="color: #333;">re<span class="idiff left right">writer</span>s</span><span class="p">)</span> <span class="n" style="color: #333;">new_locs</span> <span class="n" style="color: #333;">tc_roles</span> <span class="n" style="color: #333;">tys1</span> <span class="n" style="color: #333;">tys2</span></span>
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<pre style="margin: 0;"> <span id="LC1690" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">setWantedEq</span> <span class="n" style="color: #333;">dest</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyConAppCo</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">cos</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1691" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1692" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CtGiven</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_evar</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">evar</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">@@ -1733,14 +1733,14 @@ canEqFailure :: CtEvidence -> EqRel</td>
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<pre style="margin: 0;"> <span id="LC1733" class="line" lang="haskell"><span class="n" style="color: #333;">canEqFailure</span> <span class="n" style="color: #333;">ev</span> <span class="kt" style="color: #458; font-weight: 600;">NomEq</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;"> <span id="LC1734" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">canEqHardFailure</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;"> <span id="LC1735" class="line" lang="haskell"><span class="n" style="color: #333;">canEqFailure</span> <span class="n" style="color: #333;">ev</span> <span class="kt" style="color: #458; font-weight: 600;">ReprEq</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;">-<span id="LC1736" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">xi1</span><span class="p">,</span> <span class="n" style="color: #333;">co1</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left right">wrw</span>1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">flatten</span> <span class="kt" style="color: #458; font-weight: 600;">FM_FlattenAll</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">ty1</span></span>
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<pre style="margin: 0;">-<span id="LC1737" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">xi2</span><span class="p">,</span> <span class="n" style="color: #333;">co2</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left right">wrw</span>2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">flatten</span> <span class="kt" style="color: #458; font-weight: 600;">FM_FlattenAll</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;">+<span id="LC1736" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">xi1</span><span class="p">,</span> <span class="n" style="color: #333;">co1</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left right">rewriters</span>1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">flatten</span> <span class="kt" style="color: #458; font-weight: 600;">FM_FlattenAll</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">ty1</span></span>
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<pre style="margin: 0;">+<span id="LC1737" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">xi2</span><span class="p">,</span> <span class="n" style="color: #333;">co2</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left right">rewriters</span>2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">flatten</span> <span class="kt" style="color: #458; font-weight: 600;">FM_FlattenAll</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;"> <span id="LC1738" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We must flatten the types before putting them in the</span></span>
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<pre style="margin: 0;"> <span id="LC1739" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- inert set, so that we are sure to kick them out when</span></span>
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<pre style="margin: 0;"> <span id="LC1740" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- new equalities become available</span></span>
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<pre style="margin: 0;"> <span id="LC1741" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"canEqFailure with ReprEq"</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC1742" class="line" lang="haskell"> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ev</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty1</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty2</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">xi1</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">xi2</span> <span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC1743" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">new_ev</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rewriteEqEvidence</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">wrw1</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">S</span></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 right">wrw</span>2</span><span class="p">)</span> <span class="n" style="color: #333;">ev</span> <span class="kt" style="color: #458; font-weight: 600;">NotSwapped</span> <span class="n" style="color: #333;">xi1</span> <span class="n" style="color: #333;">xi2</span> <span class="n" style="color: #333;">co1</span> <span class="n" style="color: #333;">co2</span></span>
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<pre style="margin: 0;">+<span id="LC1743" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">new_ev</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rewriteEqEvidence</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">rewriters1</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">S</span></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 right">rewriters</span>2</span><span class="p">)</span> <span class="n" style="color: #333;">ev</span> <span class="kt" style="color: #458; font-weight: 600;">NotSwapped</span> <span class="n" style="color: #333;">xi1</span> <span class="n" style="color: #333;">xi2</span> <span class="n" style="color: #333;">co1</span> <span class="n" style="color: #333;">co2</span></span>
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<pre style="margin: 0;"> <span id="LC1744" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">continueWith</span> <span class="p">(</span><span class="n" style="color: #333;">mkIrredCt</span> <span class="kt" style="color: #458; font-weight: 600;">OtherCIS</span> <span class="n" style="color: #333;">new_ev</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1745" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1746" class="line" lang="haskell"><span class="cd">-- | Call when canonicalizing an equality fails with utterly no hope.</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">@@ -1748,9 +1748,9 @@ canEqHardFailure :: CtEvidence</td>
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<pre style="margin: 0;"> <span id="LC1748" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">StopOrContinue</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1749" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Make sure that insolubles are fully rewritten]</span></span>
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<pre style="margin: 0;"> <span id="LC1750" class="line" lang="haskell"><span class="n" style="color: #333;">canEqHardFailure</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;">-<span id="LC1751" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">s1</span><span class="p">,</span> <span class="n" style="color: #333;">co1</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left right">wrw</span>1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">flatten</span> <span class="kt" style="color: #458; font-weight: 600;">FM_SubstOnly</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">ty1</span></span>
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<pre style="margin: 0;">-<span id="LC1752" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">s2</span><span class="p">,</span> <span class="n" style="color: #333;">co2</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left right">wrw</span>2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">flatten</span> <span class="kt" style="color: #458; font-weight: 600;">FM_SubstOnly</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;">-<span id="LC1753" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">new_ev</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rewriteEqEvidence</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">wrw1</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">S</span></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 right">wrw</span>2</span><span class="p">)</span> <span class="n" style="color: #333;">ev</span> <span class="kt" style="color: #458; font-weight: 600;">NotSwapped</span> <span class="n" style="color: #333;">s1</span> <span class="n" style="color: #333;">s2</span> <span class="n" style="color: #333;">co1</span> <span class="n" style="color: #333;">co2</span></span>
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<pre style="margin: 0;">+<span id="LC1751" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">s1</span><span class="p">,</span> <span class="n" style="color: #333;">co1</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left right">rewriters</span>1</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">flatten</span> <span class="kt" style="color: #458; font-weight: 600;">FM_SubstOnly</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">ty1</span></span>
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<pre style="margin: 0;">+<span id="LC1752" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">s2</span><span class="p">,</span> <span class="n" style="color: #333;">co2</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left right">rewriters</span>2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">flatten</span> <span class="kt" style="color: #458; font-weight: 600;">FM_SubstOnly</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;">+<span id="LC1753" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">new_ev</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rewriteEqEvidence</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">rewriters1</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">S</span></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 right">rewriters</span>2</span><span class="p">)</span> <span class="n" style="color: #333;">ev</span> <span class="kt" style="color: #458; font-weight: 600;">NotSwapped</span> <span class="n" style="color: #333;">s1</span> <span class="n" style="color: #333;">s2</span> <span class="n" style="color: #333;">co1</span> <span class="n" style="color: #333;">co2</span></span>
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<pre style="margin: 0;"> <span id="LC1754" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">continueWith</span> <span class="p">(</span><span class="n" style="color: #333;">mkIrredCt</span> <span class="kt" style="color: #458; font-weight: 600;">InsolubleCIS</span> <span class="n" style="color: #333;">new_ev</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1755" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1756" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</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">@@ -1885,7 +1885,7 @@ canCFunEqCan :: CtEvidence</td>
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<pre style="margin: 0;"> <span id="LC1885" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Instead, flatten the args. The RHS is an fsk, which we</span></span>
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<pre style="margin: 0;"> <span id="LC1886" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- must *not* substitute.</span></span>
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<pre style="margin: 0;"> <span id="LC1887" class="line" lang="haskell"><span class="n" style="color: #333;">canCFunEqCan</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">fn</span> <span class="n" style="color: #333;">tys</span> <span class="n" style="color: #333;">fsk</span></span>
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<pre style="margin: 0;">-<span id="LC1888" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">tys'</span><span class="p">,</span> <span class="n" style="color: #333;">cos</span><span class="p">,</span> <span class="n" style="color: #333;">kind_co</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left right">wrw</span></span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">flattenArgsNom</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">fn</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;">+<span id="LC1888" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">tys'</span><span class="p">,</span> <span class="n" style="color: #333;">cos</span><span class="p">,</span> <span class="n" style="color: #333;">kind_co</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left right">new_rewriters</span></span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">flattenArgsNom</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">fn</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;"> <span id="LC1889" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- cos :: tys' ~ tys</span></span>
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<pre style="margin: 0;"> <span id="LC1890" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1891" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">lhs_co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTcTyConAppCo</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">fn</span> <span class="n" style="color: #333;">cos</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">@@ -1894,12 +1894,12 @@ canCFunEqCan ev fn tys fsk</td>
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<pre style="margin: 0;"> <span id="LC1894" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1895" class="line" lang="haskell"> <span class="n" style="color: #333;">flav</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctEvFlavour</span> <span class="n" style="color: #333;">ev</span></span>
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<pre style="margin: 0;"> <span id="LC1896" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1897" class="line" lang="haskell"> <span class="n" style="color: #333;">re<span class="idiff left">port_as</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">updateReportAs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">wrw</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">ctEvUnique</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ev</span></span><span class="p"><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">ctEvPred</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ev</span></span><span class="p"><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">ctEvReportAs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ev</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC1897" class="line" lang="haskell"> <span class="n" style="color: #333;">re<span class="idiff left">writers</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">ctEvRewriters</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ev</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">S</span></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 right">new_rewriters</span></span></span>
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<pre style="margin: 0;"> <span id="LC1898" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">ev'</span><span class="p">,</span> <span class="n" style="color: #333;">fsk'</span><span class="p">)</span></span>
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1899
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1899
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<pre style="margin: 0;"> <span id="LC1899" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">isTcReflexiveCo</span> <span class="n" style="color: #333;">kind_co</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [canCFunEqCan]</span></span>
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1900
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1900
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<pre style="margin: 0;"> <span id="LC1900" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"canCFunEqCan: refl"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">new_lhs</span><span class="p">)</span></span>
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1901
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1901
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<pre style="margin: 0;"> <span id="LC1901" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">fsk_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">fsk</span></span>
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1902
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<pre style="margin: 0;">-<span id="LC1902" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">ev'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rewriteEqEvidence</span> <span class="n" style="color: #333;"><span class="idiff left right">wrw</span></span> <span class="n" style="color: #333;">ev</span> <span class="kt" style="color: #458; font-weight: 600;">NotSwapped</span> <span class="n" style="color: #333;">new_lhs</span> <span class="n" style="color: #333;">fsk_ty</span></span>
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1902
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<pre style="margin: 0;">+<span id="LC1902" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">ev'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rewriteEqEvidence</span> <span class="n" style="color: #333;"><span class="idiff left right">new_rewriters</span></span> <span class="n" style="color: #333;">ev</span> <span class="kt" style="color: #458; font-weight: 600;">NotSwapped</span> <span class="n" style="color: #333;">new_lhs</span> <span class="n" style="color: #333;">fsk_ty</span></span>
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1903
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1903
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<pre style="margin: 0;"> <span id="LC1903" class="line" lang="haskell"> <span class="n" style="color: #333;">lhs_co</span> <span class="p">(</span><span class="n" style="color: #333;">mkTcNomReflCo</span> <span class="n" style="color: #333;">fsk_ty</span><span class="p">)</span></span>
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1904
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1904
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<pre style="margin: 0;"> <span id="LC1904" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">ev'</span><span class="p">,</span> <span class="n" style="color: #333;">fsk</span><span class="p">)</span> <span class="p">}</span></span>
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1905
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1905
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<pre style="margin: 0;"> <span id="LC1905" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"canCFunEqCan: non-refl"</span> <span class="o" style="font-weight: 600;">$</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1910" 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="1910" 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">@@ -1910,7 +1910,7 @@ canCFunEqCan ev fn tys fsk</td>
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1910
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1910
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<pre style="margin: 0;"> <span id="LC1910" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"New LHS"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">new_lhs</span><span class="p">)</span></span>
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1911
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1911
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<pre style="margin: 0;"> <span id="LC1911" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">tcTypeKind</span> <span class="n" style="color: #333;">new_lhs</span><span class="p">))</span> <span class="p">]</span></span>
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1912
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1912
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<pre style="margin: 0;"> <span id="LC1912" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">ev'</span><span class="p">,</span> <span class="n" style="color: #333;">new_co</span><span class="p">,</span> <span class="n" style="color: #333;">new_fsk</span><span class="p">)</span></span>
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1913
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<pre style="margin: 0;">-<span id="LC1913" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newFlattenSkolem</span> <span class="n" style="color: #333;">flav</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvLoc</span> <span class="n" style="color: #333;">ev</span><span class="p">)</span> <span class="n" style="color: #333;">re<span class="idiff left right">port_a</span>s</span> <span class="n" style="color: #333;">fn</span> <span class="n" style="color: #333;">tys'</span></span>
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1913
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<pre style="margin: 0;">+<span id="LC1913" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newFlattenSkolem</span> <span class="n" style="color: #333;">flav</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvLoc</span> <span class="n" style="color: #333;">ev</span><span class="p">)</span> <span class="n" style="color: #333;">re<span class="idiff left right">writer</span>s</span> <span class="n" style="color: #333;">fn</span> <span class="n" style="color: #333;">tys'</span></span>
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1914
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1914
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<pre style="margin: 0;"> <span id="LC1914" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">xi</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">new_fsk</span> <span class="p">`</span><span class="n" style="color: #333;">mkCastTy</span><span class="p">`</span> <span class="n" style="color: #333;">kind_co</span></span>
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1915
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<pre style="margin: 0;"> <span id="LC1915" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- sym lhs_co :: F tys ~ F tys'</span></span>
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1916
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1916
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<pre style="margin: 0;"> <span id="LC1916" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- new_co :: F tys' ~ new_fsk</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1968" 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="1968" 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">@@ -1968,11 +1968,12 @@ canEqTyVarHetero ev eq_rel swapped tv1 ps_tv1 ki1 xi2 ps_xi2 ki2</td>
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1968
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1968
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<pre style="margin: 0;"> <span id="LC1968" class="line" lang="haskell"> <span class="n" style="color: #333;">lhs'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">tv1</span> <span class="c1" style="color: #998; font-style: italic;">-- same as old lhs</span></span>
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1969
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1969
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<pre style="margin: 0;"> <span id="LC1969" class="line" lang="haskell"> <span class="n" style="color: #333;">lhs_co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTcReflCo</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">lhs'</span></span>
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1970
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1970
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<pre style="margin: 0;"> <span id="LC1970" class="line" lang="haskell"></span>
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1971
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<pre style="margin: 0;">+<span id="LC1971" class="line" lang="haskell"> <span class="n" style="color: #333;">rewriters</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rewriterSetFromCo</span> <span class="n" style="color: #333;">kind_co</span></span>
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1972
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<pre style="margin: 0;">+<span id="LC1972" class="line" lang="haskell"></span>
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1971
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1973
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<pre style="margin: 0;"> <span id="LC1973" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"Hetero equality gives rise to kind equality"</span></span>
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1972
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1974
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<pre style="margin: 0;"> <span id="LC1974" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">kind_co</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">sep</span> <span class="p">[</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ki2</span><span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"~#"</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ki1</span> <span class="p">])</span></span>
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1973
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<pre style="margin: 0;">-<span id="LC1973" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- YesWRW: we've just emitted a new wanted and rewrote with it</span></span>
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1974
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1975
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<pre style="margin: 0;"> <span id="LC1975" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Equalities with incompatible kinds]</span></span>
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1975
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<pre style="margin: 0;">-<span id="LC1975" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">type_ev</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rewriteEqEvidence</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">YesWRW</span></span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">swapped</span> <span class="n" style="color: #333;">lhs'</span> <span class="n" style="color: #333;">rhs'</span> <span class="n" style="color: #333;">lhs_co</span> <span class="n" style="color: #333;">rhs_co</span></span>
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1976
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<pre style="margin: 0;">+<span id="LC1976" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">type_ev</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rewriteEqEvidence</span> <span class="n" style="color: #333;"><span class="idiff left right">rewriters</span></span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">swapped</span> <span class="n" style="color: #333;">lhs'</span> <span class="n" style="color: #333;">rhs'</span> <span class="n" style="color: #333;">lhs_co</span> <span class="n" style="color: #333;">rhs_co</span></span>
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1976
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1977
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<pre style="margin: 0;"> <span id="LC1977" class="line" lang="haskell"></span>
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1977
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1978
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<pre style="margin: 0;"> <span id="LC1978" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- rewriteEqEvidence carries out the swap, so we're NotSwapped any more</span></span>
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1978
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1979
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<pre style="margin: 0;"> <span id="LC1979" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">canEqTyVarHomo</span> <span class="n" style="color: #333;">type_ev</span> <span class="n" style="color: #333;">eq_rel</span> <span class="kt" style="color: #458; font-weight: 600;">NotSwapped</span> <span class="n" style="color: #333;">tv1</span> <span class="n" style="color: #333;">ps_tv1</span> <span class="n" style="color: #333;">rhs'</span> <span class="n" style="color: #333;">ps_rhs'</span> <span class="p">}</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1985" 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="1986" 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">@@ -1985,11 +1986,11 @@ canEqTyVarHetero ev eq_rel swapped tv1 ps_tv1 ki1 xi2 ps_xi2 ki2</td>
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1985
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1986
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<pre style="margin: 0;"> <span id="LC1986" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">emitWorkNC</span> <span class="p">[</span><span class="n" style="color: #333;">kind_ev</span><span class="p">]</span></span>
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1986
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1987
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<pre style="margin: 0;"> <span id="LC1987" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvCoercion</span> <span class="n" style="color: #333;">kind_ev</span><span class="p">)</span> <span class="p">}</span></span>
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1987
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1988
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<pre style="margin: 0;"> <span id="LC1988" class="line" lang="haskell"></span>
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1988
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<pre style="margin: 0;">-<span id="LC1988" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_re<span class="idiff left">port_as</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 right">report_a</span>s</span> <span class="p">}</span></span>
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1989
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<pre style="margin: 0;">-<span id="LC1989" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">unifyWanted</span> <span class="n" style="color: #333;">re<span class="idiff left right">port_a</span>s</span> <span class="n" style="color: #333;">kind_loc</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">ki2</span> <span class="n" style="color: #333;">ki1</span></span>
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1989
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<pre style="margin: 0;">+<span id="LC1989" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_re<span class="idiff left">writers</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 right">rewriter</span>s</span> <span class="p">}</span></span>
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1990
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<pre style="margin: 0;">+<span id="LC1990" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">unifyWanted</span> <span class="n" style="color: #333;">re<span class="idiff left right">writer</span>s</span> <span class="n" style="color: #333;">kind_loc</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">ki2</span> <span class="n" style="color: #333;">ki1</span></span>
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1990
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1991
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<pre style="margin: 0;"> <span id="LC1991" class="line" lang="haskell"></span>
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1991
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1992
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<pre style="margin: 0;"> <span id="LC1992" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CtDerived</span> <span class="p">{}</span></span>
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1992
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<pre style="margin: 0;">-<span id="LC1992" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">unifyWanted</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CtReportAsSame</span></span> <span class="n" style="color: #333;">kind_loc</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">ki2</span> <span class="n" style="color: #333;">ki1</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1993" 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">
1993
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<pre style="margin: 0;">+<span id="LC1993" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">unifyWanted</span> <span class="n" style="color: #333;"><span class="idiff left right">emptyRewriterSet</span></span> <span class="n" style="color: #333;">kind_loc</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">ki2</span> <span class="n" style="color: #333;">ki1</span></span>
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1993
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1994
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<pre style="margin: 0;"> <span id="LC1994" class="line" lang="haskell"></span>
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1994
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1995
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<pre style="margin: 0;"> <span id="LC1995" 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;">ctev_loc</span> <span class="n" style="color: #333;">ev</span></span>
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1995
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1996
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<pre style="margin: 0;"> <span id="LC1996" class="line" lang="haskell"> <span class="n" style="color: #333;">role</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eqRelRole</span> <span class="n" style="color: #333;">eq_rel</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2027" 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="2028" 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">@@ -2027,7 +2028,7 @@ canEqTyVarHomo ev eq_rel swapped tv1 ps_xi1 xi2 _</td>
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2027
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2028
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<pre style="margin: 0;"> <span id="LC2028" class="line" lang="haskell"> <span class="n" style="color: #333;">new_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">tv2</span></span>
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2028
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2029
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<pre style="margin: 0;"> <span id="LC2029" class="line" lang="haskell"> <span class="n" style="color: #333;">rhs_co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTcGReflRightCo</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">new_rhs</span> <span class="n" style="color: #333;">co2</span></span>
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2029
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2030
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<pre style="margin: 0;"> <span id="LC2030" class="line" lang="haskell"></span>
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2030
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<pre style="margin: 0;">-<span id="LC2030" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">new_ev</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rewriteEqEvidence</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">NoWRW</span></span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">swapped</span> <span class="n" style="color: #333;">new_lhs</span> <span class="n" style="color: #333;">new_rhs</span> <span class="n" style="color: #333;">lhs_co</span> <span class="n" style="color: #333;">rhs_co</span></span>
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2031
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<pre style="margin: 0;">+<span id="LC2031" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">new_ev</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rewriteEqEvidence</span> <span class="n" style="color: #333;"><span class="idiff left right">emptyRewriterSet</span></span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">swapped</span> <span class="n" style="color: #333;">new_lhs</span> <span class="n" style="color: #333;">new_rhs</span> <span class="n" style="color: #333;">lhs_co</span> <span class="n" style="color: #333;">rhs_co</span></span>
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2031
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2032
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<pre style="margin: 0;"> <span id="LC2032" class="line" lang="haskell"></span>
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2032
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2033
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<pre style="margin: 0;"> <span id="LC2033" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getDynFlags</span></span>
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2033
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2034
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<pre style="margin: 0;"> <span id="LC2034" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">canEqTyVar2</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">new_ev</span> <span class="n" style="color: #333;">eq_rel</span> <span class="kt" style="color: #458; font-weight: 600;">IsSwapped</span> <span class="n" style="color: #333;">tv2</span> <span class="p">(</span><span class="n" style="color: #333;">ps_xi1</span> <span class="p">`</span><span class="n" style="color: #333;">mkCastTy</span><span class="p">`</span> <span class="n" style="color: #333;">sym_co2</span><span class="p">)</span> <span class="p">}</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2059" 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="2060" 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">@@ -2059,14 +2060,16 @@ canEqTyVar2 dflags ev eq_rel swapped tv1 rhs</td>
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2059
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2060
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<pre style="margin: 0;"> <span id="LC2060" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- equalities, in case have x ~ (y :: ..x...)</span></span>
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2060
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2061
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<pre style="margin: 0;"> <span id="LC2061" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- #12593</span></span>
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2061
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2062
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<pre style="margin: 0;"> <span id="LC2062" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- guarantees (TyEq:OC), (TyEq:F), and (TyEq:H)</span></span>
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2062
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<pre style="margin: 0;">-<span id="LC2062" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">new_ev</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rewriteEqEvidence</span> <span class="kt" style="color: #458; font-weight: 600;">NoWRW</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">swapped</span> <span class="n" style="color: #333;">lhs</span> <span class="n" style="color: #333;">rhs'</span> <span class="n" style="color: #333;">rewrite_co1</span> <span class="n" style="color: #333;">rewrite_co2</span></span>
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<pre style="margin: 0;">+<span id="LC2063" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">new_ev</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rewriteEqEvidence</span> <span class="n" style="color: #333;">emptyRewriterSet</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">swapped</span> <span class="n" style="color: #333;">lhs</span> <span class="n" style="color: #333;">rhs'</span></span>
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2064
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<pre style="margin: 0;">+<span id="LC2064" class="line" lang="haskell"> <span class="n" style="color: #333;">rewrite_co1</span> <span class="n" style="color: #333;">rewrite_co2</span></span>
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2063
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2065
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<pre style="margin: 0;"> <span id="LC2065" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">continueWith</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CTyEqCan</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">new_ev</span><span class="p">,</span> <span class="n" style="color: #333;">cc_tyvar</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tv1</span></span>
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2064
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2066
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<pre style="margin: 0;"> <span id="LC2066" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cc_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs'</span><span class="p">,</span> <span class="n" style="color: #333;">cc_eq_rel</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eq_rel</span> <span class="p">})</span> <span class="p">}</span></span>
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2065
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2067
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<pre style="margin: 0;"> <span id="LC2067" class="line" lang="haskell"></span>
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2066
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2068
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<pre style="margin: 0;"> <span id="LC2068" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="c1" style="color: #998; font-style: italic;">-- For some reason (occurs check, or forall) we can't unify</span></span>
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2067
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2069
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<pre style="margin: 0;"> <span id="LC2069" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We must not use it for further rewriting!</span></span>
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2068
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2070
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<pre style="margin: 0;"> <span id="LC2070" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"canEqTyVar2 can't unify"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tv1</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span></span>
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2069
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<pre style="margin: 0;">-<span id="LC2069" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">new_ev</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rewriteEqEvidence</span> <span class="kt" style="color: #458; font-weight: 600;">NoWRW</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">swapped</span> <span class="n" style="color: #333;">lhs</span> <span class="n" style="color: #333;">rhs</span> <span class="n" style="color: #333;">rewrite_co1</span> <span class="n" style="color: #333;">rewrite_co2</span></span>
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2071
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<pre style="margin: 0;">+<span id="LC2071" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">new_ev</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rewriteEqEvidence</span> <span class="n" style="color: #333;">emptyRewriterSet</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">swapped</span> <span class="n" style="color: #333;">lhs</span> <span class="n" style="color: #333;">rhs</span></span>
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2072
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<pre style="margin: 0;">+<span id="LC2072" class="line" lang="haskell"> <span class="n" style="color: #333;">rewrite_co1</span> <span class="n" style="color: #333;">rewrite_co2</span></span>
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2070
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2073
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<pre style="margin: 0;"> <span id="LC2073" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">status</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isInsolubleOccursCheck</span> <span class="n" style="color: #333;">eq_rel</span> <span class="n" style="color: #333;">tv1</span> <span class="n" style="color: #333;">rhs</span></span>
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2071
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2074
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<pre style="margin: 0;"> <span id="LC2074" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">InsolubleCIS</span></span>
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2072
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2075
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<pre style="margin: 0;"> <span id="LC2075" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- If we have a ~ [a], it is not canonical, and in particular</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2298" 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>
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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">@@ -2298,8 +2301,7 @@ andWhenContinue tcs1 tcs2</td>
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2298
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2301
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<pre style="margin: 0;"> <span id="LC2301" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ContinueWith</span> <span class="n" style="color: #333;">ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">tcs2</span> <span class="n" style="color: #333;">ct</span> <span class="p">}</span></span>
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2299
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2302
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<pre style="margin: 0;"> <span id="LC2302" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">infixr</span> <span class="mi" style="color: #099;">0</span> <span class="p">`</span><span class="n" style="color: #333;">andWhenContinue</span><span class="p">`</span> <span class="c1" style="color: #998; font-style: italic;">-- allow chaining with ($)</span></span>
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2300
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2303
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<pre style="margin: 0;"> <span id="LC2303" class="line" lang="haskell"></span>
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2301
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<pre style="margin: 0;">-<span id="LC2301" class="line" lang="haskell"><span class="n" style="color: #333;">rewriteEvidence</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">WRWFlag</span> <span class="c1" style="color: #998; font-style: italic;">-- did wanteds rewrite wanteds?</span></span>
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2302
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<pre style="margin: 0;">-<span id="LC2302" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Wanteds rewrite Wanteds]</span></span>
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<pre style="margin: 0;">+<span id="LC2304" class="line" lang="haskell"><span class="n" style="color: #333;">rewriteEvidence</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">RewriterSet</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Wanteds rewrite Wanteds]</span></span>
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<pre style="margin: 0;"> <span id="LC2305" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in GHC.Tc.Types.Constraint</span></span>
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<pre style="margin: 0;"> <span id="LC2306" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span> <span class="c1" style="color: #998; font-style: italic;">-- old evidence</span></span>
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<pre style="margin: 0;"> <span id="LC2307" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcPredType</span> <span class="c1" style="color: #998; font-style: italic;">-- new predicate</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">@@ -2339,7 +2341,7 @@ as well as in old_pred; that is important for good error messages.</td>
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<pre style="margin: 0;"> <span id="LC2341" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -}</span></span>
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<pre style="margin: 0;"> <span id="LC2342" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2343" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2342" class="line" lang="haskell"><span class="n" style="color: #333;">rewriteEvidence</span> <span class="n" style="color: #333;">_<span class="idiff left right">wrw</span></span> <span class="n" style="color: #333;">old_ev</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CtDerived</span> <span class="p">{})</span> <span class="n" style="color: #333;">new_pred</span> <span class="n" style="color: #333;">_co</span></span>
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<pre style="margin: 0;">+<span id="LC2344" class="line" lang="haskell"><span class="n" style="color: #333;">rewriteEvidence</span> <span class="n" style="color: #333;">_<span class="idiff left right">rewriters</span></span> <span class="n" style="color: #333;">old_ev</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CtDerived</span> <span class="p">{})</span> <span class="n" style="color: #333;">new_pred</span> <span class="n" style="color: #333;">_co</span></span>
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<pre style="margin: 0;"> <span id="LC2345" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- If derived, don't even look at the coercion.</span></span>
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<pre style="margin: 0;"> <span id="LC2346" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This is very important, DO NOT re-order the equations for</span></span>
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<pre style="margin: 0;"> <span id="LC2347" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- rewriteEvidence to put the isTcReflCo test first!</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">@@ -2349,12 +2351,12 @@ rewriteEvidence _wrw old_ev@(CtDerived {}) new_pred _co</td>
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<pre style="margin: 0;"> <span id="LC2351" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (Getting this wrong caused #7384.)</span></span>
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<pre style="margin: 0;"> <span id="LC2352" class="line" lang="haskell"> <span class="n" style="color: #333;">continueWith</span> <span class="p">(</span><span class="n" style="color: #333;">old_ev</span> <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;">new_pred</span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC2353" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2352" class="line" lang="haskell"><span class="n" style="color: #333;">rewriteEvidence</span> <span class="n" style="color: #333;">_<span class="idiff left right">wrw</span></span> <span class="n" style="color: #333;">old_ev</span> <span class="n" style="color: #333;">new_pred</span> <span class="n" style="color: #333;">co</span></span>
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<pre style="margin: 0;">+<span id="LC2354" class="line" lang="haskell"><span class="n" style="color: #333;">rewriteEvidence</span> <span class="n" style="color: #333;">_<span class="idiff left right">rewriters</span></span> <span class="n" style="color: #333;">old_ev</span> <span class="n" style="color: #333;">new_pred</span> <span class="n" style="color: #333;">co</span></span>
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<pre style="margin: 0;"> <span id="LC2355" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTcReflCo</span> <span class="n" style="color: #333;">co</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Rewriting with Refl]</span></span>
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<pre style="margin: 0;"> <span id="LC2356" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">continueWith</span> <span class="p">(</span><span class="n" style="color: #333;">old_ev</span> <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;">new_pred</span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC2357" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2356" class="line" lang="haskell"><span class="n" style="color: #333;">rewriteEvidence</span> <span class="n" style="color: #333;"><span class="idiff left right">wrw</span></span> <span class="n" style="color: #333;">ev</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CtGiven</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_evar</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">old_evar</span><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 class="p">})</span> <span class="n" style="color: #333;">new_pred</span> <span class="n" style="color: #333;">co</span></span>
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2357
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<pre style="margin: 0;">-<span id="LC2357" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;"><span class="idiff left">wrw</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">==</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">NoWRW</span></span> <span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- this is a Given, not a wanted</span></span>
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2358
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<pre style="margin: 0;">+<span id="LC2358" class="line" lang="haskell"><span class="n" style="color: #333;">rewriteEvidence</span> <span class="n" style="color: #333;"><span class="idiff left right">rewriters</span></span> <span class="n" style="color: #333;">ev</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CtGiven</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_evar</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">old_evar</span><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 class="p">})</span> <span class="n" style="color: #333;">new_pred</span> <span class="n" style="color: #333;">co</span></span>
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2359
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<pre style="margin: 0;">+<span id="LC2359" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;"><span class="idiff left">isEmptyRewriterSet</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">rewriters</span></span> <span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- this is a Given, not a wanted</span></span>
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2358
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2360
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<pre style="margin: 0;"> <span id="LC2360" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">new_ev</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newGivenEvVar</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="n" style="color: #333;">new_pred</span><span class="p">,</span> <span class="n" style="color: #333;">new_tm</span><span class="p">)</span></span>
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2359
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2361
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<pre style="margin: 0;"> <span id="LC2361" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">continueWith</span> <span class="n" style="color: #333;">new_ev</span> <span class="p">}</span></span>
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2360
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2362
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<pre style="margin: 0;"> <span id="LC2362" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</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">@@ -2363,12 +2365,12 @@ rewriteEvidence wrw ev@(CtGiven { ctev_evar = old_evar, ctev_loc = loc }) new_pr</td>
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2363
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2365
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<pre style="margin: 0;"> <span id="LC2365" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ctEvRole</span> <span class="n" style="color: #333;">ev</span><span class="p">)</span></span>
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2364
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2366
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<pre style="margin: 0;"> <span id="LC2366" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">mkTcSymCo</span> <span class="n" style="color: #333;">co</span><span class="p">))</span></span>
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2367
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<pre style="margin: 0;"> <span id="LC2367" class="line" lang="haskell"></span>
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2366
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<pre style="margin: 0;">-<span id="LC2366" class="line" lang="haskell"><span class="n" style="color: #333;">rewriteEvidence</span> <span class="n" style="color: #333;"><span class="idiff left">wrw</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ev</span></span><span class="o" style="font-weight: 600;"><span class="idiff">@</span></span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">CtWanted</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">ctev_pred</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 right">old_pred</span></span></span>
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2367
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<pre style="margin: 0;">-<span id="LC2367" class="line" lang="haskell"> <span class="idiff left"> </span><span class="p"><span class="idiff right">,</span></span> <span class="n" style="color: #333;">ctev_dest</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dest</span></span>
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2368
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<pre style="margin: 0;">-<span id="LC2368" class="line" lang="haskell"> <span class="idiff left right"> </span><span class="p">,</span> <span class="n" style="color: #333;">ctev_nosh</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">si</span></span>
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2369
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<pre style="margin: 0;">-<span id="LC2369" class="line" lang="haskell"> <span class="idiff left right"> </span><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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2370
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<pre style="margin: 0;">-<span id="LC2370" class="line" lang="haskell"> <span class="idiff left"> </span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ctev_report_as</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 right">report_a</span>s</span> <span class="p">})</span> <span class="n" style="color: #333;">new_pred</span> <span class="n" style="color: #333;">co</span></span>
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2371
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<pre style="margin: 0;">-<span id="LC2371" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">mb_new_ev</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newWanted_SI</span> <span class="n" style="color: #333;">si</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">port_a</span>s'</span> <span class="n" style="color: #333;">new_pred</span></span>
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<pre style="margin: 0;">+<span id="LC2368" class="line" lang="haskell"><span class="n" style="color: #333;">rewriteEvidence</span> <span class="n" style="color: #333;"><span class="idiff left right">new_rewriters</span></span></span>
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<pre style="margin: 0;">+<span id="LC2369" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">ev</span></span><span class="o" style="font-weight: 600;"><span class="idiff">@</span></span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">CtWanted</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">{</span></span> <span class="n" style="color: #333;">ctev_dest</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dest</span></span>
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<pre style="margin: 0;">+<span id="LC2370" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_nosh</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">si</span></span>
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<pre style="margin: 0;">+<span id="LC2371" 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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<pre style="margin: 0;">+<span id="LC2372" class="line" lang="haskell"> <span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ctev_rewriters</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 right">rewriter</span>s</span> <span class="p">})</span> <span class="n" style="color: #333;">new_pred</span> <span class="n" style="color: #333;">co</span></span>
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<pre style="margin: 0;">+<span id="LC2373" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">mb_new_ev</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newWanted_SI</span> <span class="n" style="color: #333;">si</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">writer</span>s'</span> <span class="n" style="color: #333;">new_pred</span></span>
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<pre style="margin: 0;"> <span id="LC2374" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The "_SI" variant ensures that we make a new Wanted</span></span>
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<pre style="margin: 0;"> <span id="LC2375" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- with the same shadow-info as the existing one</span></span>
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<pre style="margin: 0;"> <span id="LC2376" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- with the same shadow-info as the existing one (#16735)</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">@@ -2380,10 +2382,11 @@ rewriteEvidence wrw ev@(CtWanted { ctev_pred = old_pred</td>
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<pre style="margin: 0;"> <span id="LC2382" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Fresh</span> <span class="n" style="color: #333;">new_ev</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">continueWith</span> <span class="n" style="color: #333;">new_ev</span></span>
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<pre style="margin: 0;"> <span id="LC2383" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Cached</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">stopWith</span> <span class="n" style="color: #333;">ev</span> <span class="s" style="color: #d14;">"Cached wanted"</span> <span class="p">}</span></span>
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2384
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<pre style="margin: 0;"> <span id="LC2384" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2383
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<pre style="margin: 0;">-<span id="LC2383" class="line" lang="haskell"> <span class="n" style="color: #333;">re<span class="idiff left">port_as'</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">updateReportAs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">wrw</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">tcEvDestUnique</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">dest</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">old_pred</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">report_a</span>s</span></span>
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<pre style="margin: 0;">+<span id="LC2385" class="line" lang="haskell"> <span class="n" style="color: #333;">re<span class="idiff left">writers'</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">rewriters</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">S</span></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 right">new_rewriter</span>s</span></span>
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<pre style="margin: 0;"> <span id="LC2386" class="line" lang="haskell"></span>
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2387
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<pre style="margin: 0;"> <span id="LC2387" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2386" class="line" lang="haskell"><span class="n" style="color: #333;">rewriteEqEvidence</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">WRWFlag</span> <span class="c1" style="color: #998; font-style: italic;">-- YesWRW <=> a wanted rewrote a wanted</span></span>
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<pre style="margin: 0;">+<span id="LC2388" class="line" lang="haskell"><span class="n" style="color: #333;">rewriteEqEvidence</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">RewriterSet</span> <span class="c1" style="color: #998; font-style: italic;">-- See GHC.Tc.Types.Constraint</span></span>
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<pre style="margin: 0;">+<span id="LC2389" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Wanteds rewrite Wanteds]</span></span>
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<pre style="margin: 0;"> <span id="LC2390" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span> <span class="c1" style="color: #998; font-style: italic;">-- Old evidence :: olhs ~ orhs (not swapped)</span></span>
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<pre style="margin: 0;"> <span id="LC2391" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- or orhs ~ olhs (swapped)</span></span>
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<pre style="margin: 0;"> <span id="LC2392" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SwapFlag</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">@@ -2406,7 +2409,7 @@ rewriteEqEvidence :: WRWFlag -- YesWRW <=> a wanted rewrote a wanted</td>
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<pre style="margin: 0;"> <span id="LC2409" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- w : orhs ~ olhs = sym rhs_co ; sym w1 ; lhs_co</span></span>
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<pre style="margin: 0;"> <span id="LC2410" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;"> <span id="LC2411" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- It's all a form of rewwriteEvidence, specialised for equalities</span></span>
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<pre style="margin: 0;">-<span id="LC2409" class="line" lang="haskell"><span class="n" style="color: #333;">rewriteEqEvidence</span> <span class="n" style="color: #333;"><span class="idiff left right">wrw</span></span> <span class="n" style="color: #333;">old_ev</span> <span class="n" style="color: #333;">swapped</span> <span class="n" style="color: #333;">nlhs</span> <span class="n" style="color: #333;">nrhs</span> <span class="n" style="color: #333;">lhs_co</span> <span class="n" style="color: #333;">rhs_co</span></span>
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<pre style="margin: 0;">+<span id="LC2412" class="line" lang="haskell"><span class="n" style="color: #333;">rewriteEqEvidence</span> <span class="n" style="color: #333;"><span class="idiff left right">new_rewriters</span></span> <span class="n" style="color: #333;">old_ev</span> <span class="n" style="color: #333;">swapped</span> <span class="n" style="color: #333;">nlhs</span> <span class="n" style="color: #333;">nrhs</span> <span class="n" style="color: #333;">lhs_co</span> <span class="n" style="color: #333;">rhs_co</span></span>
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2413
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<pre style="margin: 0;"> <span id="LC2413" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">CtDerived</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">old_ev</span> <span class="c1" style="color: #998; font-style: italic;">-- Don't force the evidence for a Derived</span></span>
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2414
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<pre style="margin: 0;"> <span id="LC2414" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">old_ev</span> <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;">new_pred</span> <span class="p">})</span></span>
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2415
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<pre style="margin: 0;"> <span id="LC2415" 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">@@ -2421,14 +2424,13 @@ rewriteEqEvidence wrw old_ev swapped nlhs nrhs lhs_co rhs_co</td>
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<pre style="margin: 0;"> <span id="LC2424" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">mkTcTransCo</span><span class="p">`</span> <span class="n" style="color: #333;">mkTcSymCo</span> <span class="n" style="color: #333;">rhs_co</span><span class="p">)</span></span>
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2425
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<pre style="margin: 0;"> <span id="LC2425" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">newGivenEvVar</span> <span class="n" style="color: #333;">loc'</span> <span class="p">(</span><span class="n" style="color: #333;">new_pred</span><span class="p">,</span> <span class="n" style="color: #333;">new_tm</span><span class="p">)</span> <span class="p">}</span></span>
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2426
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<pre style="margin: 0;"> <span id="LC2426" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2424" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <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;">old_pred</span></span>
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<pre style="margin: 0;">-<span id="LC2425" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_dest</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dest</span></span>
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<pre style="margin: 0;">+<span id="LC2427" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_dest</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dest</span></span>
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<pre style="margin: 0;"> <span id="LC2428" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_nosh</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">si</span></span>
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<pre style="margin: 0;">-<span id="LC2427" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_re<span class="idiff left">port_as</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 right">report_a</span>s</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">old_ev</span></span>
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<pre style="margin: 0;">-<span id="LC2428" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">re<span class="idiff left">port_as'</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">updateReportAs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">wrw</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">tcEvDestUnique</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">dest</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">old_pred</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">report_a</span>s</span></span>
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<pre style="margin: 0;">+<span id="LC2429" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_re<span class="idiff left">writers</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 right">rewriter</span>s</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">old_ev</span></span>
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<pre style="margin: 0;">+<span id="LC2430" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">re<span class="idiff left">writers'</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">rewriters</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">S</span></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 right">new_rewriter</span>s</span></span>
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<pre style="margin: 0;"> <span id="LC2431" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">dest</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2430
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2432
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<pre style="margin: 0;"> <span id="LC2432" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HoleDest</span> <span class="n" style="color: #333;">hole</span> <span class="o" style="font-weight: 600;">-></span></span>
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2431
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<pre style="margin: 0;">-<span id="LC2431" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">new_ev</span><span class="p">,</span> <span class="n" style="color: #333;">hole_co</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newWantedEq_SI</span> <span class="p">(</span><span class="n" style="color: #333;">ch_blocker</span> <span class="n" style="color: #333;">hole</span><span class="p">)</span> <span class="n" style="color: #333;">si</span> <span class="n" style="color: #333;">loc'</span> <span class="n" style="color: #333;">re<span class="idiff left right">port_a</span>s'</span></span>
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2433
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<pre style="margin: 0;">+<span id="LC2433" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">new_ev</span><span class="p">,</span> <span class="n" style="color: #333;">hole_co</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newWantedEq_SI</span> <span class="p">(</span><span class="n" style="color: #333;">ch_blocker</span> <span class="n" style="color: #333;">hole</span><span class="p">)</span> <span class="n" style="color: #333;">si</span> <span class="n" style="color: #333;">loc'</span> <span class="n" style="color: #333;">re<span class="idiff left right">writer</span>s'</span></span>
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2432
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2434
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<pre style="margin: 0;"> <span id="LC2434" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">ctEvRole</span> <span class="n" style="color: #333;">old_ev</span><span class="p">)</span> <span class="n" style="color: #333;">nlhs</span> <span class="n" style="color: #333;">nrhs</span></span>
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2433
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2435
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<pre style="margin: 0;"> <span id="LC2435" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The "_SI" variant ensures that we make a new Wanted</span></span>
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2436
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<pre style="margin: 0;"> <span id="LC2436" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- with the same shadow-info as the existing one (#16735)</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">@@ -2468,31 +2470,31 @@ But where it succeeds in finding common structure, it just builds a coercion</td>
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2470
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<pre style="margin: 0;"> <span id="LC2470" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to reflect it.</span></span>
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<pre style="margin: 0;"> <span id="LC2471" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;"> <span id="LC2472" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2471" class="line" lang="haskell"><span class="n" style="color: #333;">unifyWanted</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CtReportAs</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span></span>
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<pre style="margin: 0;">+<span id="LC2473" class="line" lang="haskell"><span class="n" style="color: #333;">unifyWanted</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">RewriterSet</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span></span>
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<pre style="margin: 0;"> <span id="LC2474" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Role</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span></span>
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2473
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2475
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<pre style="margin: 0;"> <span id="LC2475" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Return coercion witnessing the equality of the two types,</span></span>
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2476
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<pre style="margin: 0;"> <span id="LC2476" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- emitting new work equalities where necessary to achieve that</span></span>
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2477
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<pre style="margin: 0;"> <span id="LC2477" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Very good short-cut when the two types are equal, or nearly so</span></span>
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2478
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<pre style="margin: 0;"> <span id="LC2478" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [unifyWanted and unifyDerived]</span></span>
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2479
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<pre style="margin: 0;"> <span id="LC2479" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The returned coercion's role matches the input parameter</span></span>
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<pre style="margin: 0;">-<span id="LC2478" class="line" lang="haskell"><span class="n" style="color: #333;">unifyWanted</span> <span class="n" style="color: #333;">re<span class="idiff left right">port_a</span>s</span> <span class="n" style="color: #333;">loc</span> <span class="kt" style="color: #458; font-weight: 600;">Phantom</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;">-<span id="LC2479" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">kind_co</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unifyWanted</span> <span class="n" style="color: #333;">re<span class="idiff left right">port_a</span>s</span> <span class="n" style="color: #333;">loc</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="p">(</span><span class="n" style="color: #333;">tcTypeKind</span> <span class="n" style="color: #333;">ty1</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">tcTypeKind</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2480" class="line" lang="haskell"><span class="n" style="color: #333;">unifyWanted</span> <span class="n" style="color: #333;">re<span class="idiff left right">writer</span>s</span> <span class="n" style="color: #333;">loc</span> <span class="kt" style="color: #458; font-weight: 600;">Phantom</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;">+<span id="LC2481" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">kind_co</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unifyWanted</span> <span class="n" style="color: #333;">re<span class="idiff left right">writer</span>s</span> <span class="n" style="color: #333;">loc</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="p">(</span><span class="n" style="color: #333;">tcTypeKind</span> <span class="n" style="color: #333;">ty1</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">tcTypeKind</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2482" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkPhantomCo</span> <span class="n" style="color: #333;">kind_co</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC2483" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2482" class="line" lang="haskell"><span class="n" style="color: #333;">unifyWanted</span> <span class="n" style="color: #333;">re<span class="idiff left right">port_a</span>s</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">orig_ty1</span> <span class="n" style="color: #333;">orig_ty2</span></span>
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<pre style="margin: 0;">+<span id="LC2484" class="line" lang="haskell"><span class="n" style="color: #333;">unifyWanted</span> <span class="n" style="color: #333;">re<span class="idiff left right">writer</span>s</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">orig_ty1</span> <span class="n" style="color: #333;">orig_ty2</span></span>
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<pre style="margin: 0;"> <span id="LC2485" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">orig_ty1</span> <span class="n" style="color: #333;">orig_ty2</span></span>
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<pre style="margin: 0;"> <span id="LC2486" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2487
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<pre style="margin: 0;"> <span id="LC2487" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">ty1'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcView</span> <span class="n" style="color: #333;">ty1</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty1'</span> <span class="n" style="color: #333;">ty2</span></span>
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2488
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<pre style="margin: 0;"> <span id="LC2488" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">ty2'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcView</span> <span class="n" style="color: #333;">ty2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2'</span></span>
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<pre style="margin: 0;"> <span id="LC2489" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2490" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FunTy</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">s1</span> <span class="n" style="color: #333;">t1</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FunTy</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">s2</span> <span class="n" style="color: #333;">t2</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC2489" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">co_s</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unifyWanted</span> <span class="n" style="color: #333;">re<span class="idiff left right">port_a</span>s</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">s1</span> <span class="n" style="color: #333;">s2</span></span>
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<pre style="margin: 0;">-<span id="LC2490" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">co_t</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unifyWanted</span> <span class="n" style="color: #333;">re<span class="idiff left right">port_a</span>s</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">t1</span> <span class="n" style="color: #333;">t2</span></span>
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<pre style="margin: 0;">+<span id="LC2491" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">co_s</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unifyWanted</span> <span class="n" style="color: #333;">re<span class="idiff left right">writer</span>s</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">s1</span> <span class="n" style="color: #333;">s2</span></span>
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<pre style="margin: 0;">+<span id="LC2492" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">co_t</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unifyWanted</span> <span class="n" style="color: #333;">re<span class="idiff left right">writer</span>s</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">t1</span> <span class="n" style="color: #333;">t2</span></span>
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<pre style="margin: 0;"> <span id="LC2493" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkFunCo</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">co_s</span> <span class="n" style="color: #333;">co_t</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC2494" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyConApp</span> <span class="n" style="color: #333;">tc1</span> <span class="n" style="color: #333;">tys1</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyConApp</span> <span class="n" style="color: #333;">tc2</span> <span class="n" style="color: #333;">tys2</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2495" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">tc1</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">tc2</span><span class="p">,</span> <span class="n" style="color: #333;">tys1</span> <span class="p">`</span><span class="n" style="color: #333;">equalLength</span><span class="p">`</span> <span class="n" style="color: #333;">tys2</span></span>
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2494
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2496
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<pre style="margin: 0;"> <span id="LC2496" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">isInjectiveTyCon</span> <span class="n" style="color: #333;">tc1</span> <span class="n" style="color: #333;">role</span> <span class="c1" style="color: #998; font-style: italic;">-- don't look under newtypes at Rep equality</span></span>
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2495
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<pre style="margin: 0;">-<span id="LC2495" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">cos</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zipWith3M</span> <span class="p">(</span><span class="n" style="color: #333;">unifyWanted</span> <span class="n" style="color: #333;">re<span class="idiff left right">port_a</span>s</span> <span class="n" style="color: #333;">loc</span><span class="p">)</span></span>
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2497
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<pre style="margin: 0;">+<span id="LC2497" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">cos</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zipWith3M</span> <span class="p">(</span><span class="n" style="color: #333;">unifyWanted</span> <span class="n" style="color: #333;">re<span class="idiff left right">writer</span>s</span> <span class="n" style="color: #333;">loc</span><span class="p">)</span></span>
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2496
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2498
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<pre style="margin: 0;"> <span id="LC2498" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">tyConRolesX</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">tc1</span><span class="p">)</span> <span class="n" style="color: #333;">tys1</span> <span class="n" style="color: #333;">tys2</span></span>
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2497
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2499
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<pre style="margin: 0;"> <span id="LC2499" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyConAppCo</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">tc1</span> <span class="n" style="color: #333;">cos</span><span class="p">)</span> <span class="p">}</span></span>
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2498
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2500
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<pre style="margin: 0;"> <span id="LC2500" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2517" 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">@@ -2515,16 +2517,12 @@ unifyWanted report_as loc role orig_ty1 orig_ty2</td>
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2515
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2517
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<pre style="margin: 0;"> <span id="LC2517" class="line" lang="haskell"> <span class="n" style="color: #333;">bale_out</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span></span>
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2516
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2518
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<pre style="margin: 0;"> <span id="LC2518" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">ty1</span> <span class="p">`</span><span class="n" style="color: #333;">tcEqType</span><span class="p">`</span> <span class="n" style="color: #333;">ty2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkTcReflCo</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">ty1</span><span class="p">)</span></span>
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2517
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<td class="diff-line-num new_line" data-linenumber="2519" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2519
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<pre style="margin: 0;"> <span id="LC2519" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Check for equality; e.g. a ~ a, or (m a) ~ (m a)</span></span>
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2518
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<pre style="margin: 0;">-<span id="LC2518" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emitNewWantedEq</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">port_a</span>s</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">orig_ty1</span> <span class="n" style="color: #333;">orig_ty2</span></span>
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2520
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<pre style="margin: 0;">+<span id="LC2520" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emitNewWantedEq</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">writer</span>s</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">orig_ty1</span> <span class="n" style="color: #333;">orig_ty2</span></span>
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2519
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2521
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<pre style="margin: 0;"> <span id="LC2521" class="line" lang="haskell"></span>
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2520
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2522
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<pre style="margin: 0;"> <span id="LC2522" class="line" lang="haskell"><span class="n" style="color: #333;">unifyDeriveds</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Role</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="nb" style="color: #0086b3;">()</span></span>
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2521
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2523
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<pre style="margin: 0;"> <span id="LC2523" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [unifyWanted and unifyDerived]</span></span>
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2522
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2524
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<pre style="margin: 0;"> <span id="LC2524" class="line" lang="haskell"><span class="n" style="color: #333;">unifyDeriveds</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">roles</span> <span class="n" style="color: #333;">tys1</span> <span class="n" style="color: #333;">tys2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">zipWith3M_</span> <span class="p">(</span><span class="n" style="color: #333;">unify_derived</span> <span class="n" style="color: #333;">loc</span><span class="p">)</span> <span class="n" style="color: #333;">roles</span> <span class="n" style="color: #333;">tys1</span> <span class="n" style="color: #333;">tys2</span></span>
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2523
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2525
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<pre style="margin: 0;"> <span id="LC2525" class="line" lang="haskell"></span>
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2524
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<pre style="margin: 0;">-<span id="LC2524" class="line" lang="haskell"><span class="n" style="color: #333;">unifyDerived</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Role</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Pair</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="nb" style="color: #0086b3;">()</span></span>
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2525
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<pre style="margin: 0;">-<span id="LC2525" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [unifyWanted and unifyDerived]</span></span>
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<pre style="margin: 0;">-<span id="LC2526" class="line" lang="haskell"><span class="n" style="color: #333;">unifyDerived</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">role</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Pair</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unify_derived</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;">-<span id="LC2527" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2526" class="line" lang="haskell"><span class="n" style="color: #333;">unify_derived</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Role</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC2527" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Create new Derived and put it in the work list</span></span>
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<pre style="margin: 0;"> <span id="LC2528" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Should do nothing if the two types are equal</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/f5433f0bc06f65deb96a44b62d47875ec4bc5b38...5d3804aec65f0801363c28ca3bb8a15f4ef3e6db#81707f1fe21087531cefd70879aa09c2be5c1d22"><strong>compiler/GHC/Tc/Solver/Flatten.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -456,13 +456,13 @@ wanteds, we will</td>
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<pre style="margin: 0;"> <span id="LC456" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">FlatWorkListRef</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TcRef</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Ct</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [The flattening work list]</span></span>
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<pre style="margin: 0;"> <span id="LC457" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC458" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">FlattenEnv</span></span>
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<pre style="margin: 0;">-<span id="LC459" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FE</span> <span class="p">{</span> <span class="n" style="color: #333;">fe_mode</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">FlattenMode</span></span>
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<pre style="margin: 0;">-<span id="LC460" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fe_loc</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Flattener CtLoc]</span></span>
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<pre style="margin: 0;">+<span id="LC459" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FE</span> <span class="p">{</span> <span class="n" style="color: #333;">fe_mode</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">FlattenMode</span></span>
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<pre style="margin: 0;">+<span id="LC460" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fe_loc</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Flattener CtLoc]</span></span>
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<pre style="margin: 0;"> <span id="LC461" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- unbanged because it's bogus in rewriteTyVar</span></span>
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<pre style="margin: 0;">-<span id="LC462" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fe_flavour</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">CtFlavour</span></span>
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<pre style="margin: 0;">-<span id="LC463" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fe_eq_rel</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">EqRel</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Flattener EqRels]</span></span>
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<pre style="margin: 0;">-<span id="LC464" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fe_work</span> <span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">FlatWorkListRef</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [The flattening work list]</span></span>
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<pre style="margin: 0;">-<span id="LC465" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fe_<span class="idiff left">wrw</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">!</span></span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TcRef</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">WRWFlag</span></span><span class="p">)</span> <span class="p">}</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Flattening wanteds]</span></span>
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<pre style="margin: 0;">+<span id="LC462" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fe_flavour</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">CtFlavour</span></span>
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<pre style="margin: 0;">+<span id="LC463" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fe_eq_rel</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">EqRel</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Flattener EqRels]</span></span>
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<pre style="margin: 0;">+<span id="LC464" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fe_work</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">::</span> <span class="o" style="font-weight: 600;">!</span><span class="kt" style="color: #458; font-weight: 600;">FlatWorkListRef</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [The flattening work list]</span></span>
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465
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<pre style="margin: 0;">+<span id="LC465" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fe_<span class="idiff left">rewriters</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">!</span></span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TcRef</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">RewriterSet</span></span><span class="p">)</span> <span class="p">}</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Flattening wanteds]</span></span>
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<pre style="margin: 0;"> <span id="LC466" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC467" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">FlattenMode</span> <span class="c1" style="color: #998; font-style: italic;">-- Postcondition for all three: inert wrt the type substitution</span></span>
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<pre style="margin: 0;"> <span id="LC468" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FM_FlattenAll</span> <span class="c1" style="color: #998; font-style: italic;">-- Postcondition: function-free</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">@@ -512,7 +512,7 @@ emitFlatWork ct = FlatM $ \env -> updTcRef (fe_work env) (ct :)</td>
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<pre style="margin: 0;"> <span id="LC512" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC513" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- convenient wrapper when you have a CtEvidence describing</span></span>
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<pre style="margin: 0;"> <span id="LC514" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the flattening operation</span></span>
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<pre style="margin: 0;">-<span id="LC515" class="line" lang="haskell"><span class="n" style="color: #333;">runFlattenCtEv</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FlattenMode</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FlatM</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;">TcS</span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">WRWFlag</span></span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC515" class="line" lang="haskell"><span class="n" style="color: #333;">runFlattenCtEv</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FlattenMode</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FlatM</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;">TcS</span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">RewriterSet</span></span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC516" class="line" lang="haskell"><span class="n" style="color: #333;">runFlattenCtEv</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">ev</span></span>
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<pre style="margin: 0;"> <span id="LC517" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">runFlatten</span> <span class="n" style="color: #333;">mode</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvLoc</span> <span class="n" style="color: #333;">ev</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvFlavour</span> <span class="n" style="color: #333;">ev</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvEqRel</span> <span class="n" style="color: #333;">ev</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC518" 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">@@ -520,22 +520,23 @@ runFlattenCtEv mode ev</td>
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<pre style="margin: 0;"> <span id="LC520" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the work it generates onto the main work list</span></span>
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<pre style="margin: 0;"> <span id="LC521" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [The flattening work list]</span></span>
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<pre style="margin: 0;"> <span id="LC522" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Also returns whether a wanted rewrote a wanted; see Note [Flattening wanteds]</span></span>
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<pre style="margin: 0;">-<span id="LC523" class="line" lang="haskell"><span class="n" style="color: #333;">runFlatten</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FlattenMode</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtFlavour</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">EqRel</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FlatM</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;">TcS</span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">WRWFlag</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC523" class="line" lang="haskell"><span class="n" style="color: #333;">runFlatten</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FlattenMode</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtFlavour</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">EqRel</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FlatM</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC524" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">RewriterSet</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC525" class="line" lang="haskell"><span class="n" style="color: #333;">runFlatten</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">flav</span> <span class="n" style="color: #333;">eq_rel</span> <span class="n" style="color: #333;">thing_inside</span></span>
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<pre style="margin: 0;"> <span id="LC526" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">flat_ref</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newTcRef</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;">-<span id="LC526" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;"><span class="idiff left">wrw_ref</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">newTcRef</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">NoWRW</span></span></span>
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<pre style="margin: 0;">+<span id="LC527" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;"><span class="idiff left">rewriters_ref</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">newTcRef</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">emptyRewriterSet</span></span></span>
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<pre style="margin: 0;"> <span id="LC528" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">fmode</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FE</span> <span class="p">{</span> <span class="n" style="color: #333;">fe_mode</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mode</span></span>
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<pre style="margin: 0;"> <span id="LC529" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fe_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">bumpCtLocDepth</span> <span class="n" style="color: #333;">loc</span></span>
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<pre style="margin: 0;"> <span id="LC530" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Flatten when discharging CFunEqCan]</span></span>
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<pre style="margin: 0;"> <span id="LC531" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fe_flavour</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">flav</span></span>
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<pre style="margin: 0;"> <span id="LC532" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fe_eq_rel</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eq_rel</span></span>
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<pre style="margin: 0;"> <span id="LC533" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fe_work</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">flat_ref</span></span>
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<pre style="margin: 0;">-<span id="LC533" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fe_<span class="idiff left">wrw</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 right">wrw</span>_ref</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC534" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fe_<span class="idiff left">rewriters</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 right">rewriters</span>_ref</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC535" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">res</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">runFlatM</span> <span class="n" style="color: #333;">thing_inside</span> <span class="n" style="color: #333;">fmode</span></span>
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<pre style="margin: 0;"> <span id="LC536" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">new_flats</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">readTcRef</span> <span class="n" style="color: #333;">flat_ref</span></span>
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<pre style="margin: 0;"> <span id="LC537" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">updWorkListTcS</span> <span class="p">(</span><span class="n" style="color: #333;">add_flats</span> <span class="n" style="color: #333;">new_flats</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC537" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;"><span class="idiff left">wrw</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">readTcRef</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">wrw</span>_ref</span></span>
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<pre style="margin: 0;">-<span id="LC538" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">res</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left right">wrw</span></span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC538" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;"><span class="idiff left">rewriters</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">readTcRef</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">rewriters</span>_ref</span></span>
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<pre style="margin: 0;">+<span id="LC539" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">res</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left right">rewriters</span></span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC540" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC541" class="line" lang="haskell"> <span class="n" style="color: #333;">add_flats</span> <span class="n" style="color: #333;">new_flats</span> <span class="n" style="color: #333;">wl</span></span>
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<pre style="margin: 0;"> <span id="LC542" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wl</span> <span class="p">{</span> <span class="n" style="color: #333;">wl_funeqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">add_funeqs</span> <span class="n" style="color: #333;">new_flats</span> <span class="p">(</span><span class="n" style="color: #333;">wl_funeqs</span> <span class="n" style="color: #333;">wl</span><span class="p">)</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">@@ -617,9 +618,11 @@ bumpDepth (FlatM thing_inside)</td>
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<pre style="margin: 0;"> <span id="LC618" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">thing_inside</span> <span class="n" style="color: #333;">env'</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC619" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC620" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Flattening wanteds]</span></span>
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<pre style="margin: 0;">-<span id="LC620" class="line" lang="haskell"><span class="n" style="color: #333;">recordWRW</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">WRWFlag</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FlatM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">-<span id="LC621" class="line" lang="haskell"><span class="n" style="color: #333;">recordWRW</span> <span class="kt" style="color: #458; font-weight: 600;">YesWRW</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FlatM</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">writeTcRef</span> <span class="p">(</span><span class="n" style="color: #333;">fe_wrw</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">YesWRW</span></span>
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<pre style="margin: 0;">-<span id="LC622" class="line" lang="haskell"><span class="n" style="color: #333;">recordWRW</span> <span class="kt" style="color: #458; font-weight: 600;">NoWRW</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC621" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Precondition: the CtEvidence is a CtWanted of an equality</span></span>
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<pre style="margin: 0;">+<span id="LC622" class="line" lang="haskell"><span class="n" style="color: #333;">recordRewriter</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FlatM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC623" class="line" lang="haskell"><span class="n" style="color: #333;">recordRewriter</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <span class="p">{</span> <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;">HoleDest</span> <span class="n" style="color: #333;">hole</span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC624" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FlatM</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">updTcRef</span> <span class="p">(</span><span class="n" style="color: #333;">fe_rewriters</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="p">(`</span><span class="n" style="color: #333;">addRewriterSet</span><span class="p">`</span> <span class="n" style="color: #333;">hole</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC625" class="line" lang="haskell"><span class="n" style="color: #333;">recordRewriter</span> <span class="n" style="color: #333;">other</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"recordRewriter"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">other</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC626" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC627" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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<pre style="margin: 0;"> <span id="LC628" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [The flattening work list]</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">@@ -787,23 +790,20 @@ when trying to find derived equalities arising from injectivity.</td>
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<pre style="margin: 0;"> <span id="LC790" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;"> <span id="LC791" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC792" class="line" lang="haskell"><span class="cd">-- | See Note [Flattening].</span></span>
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<pre style="margin: 0;">-<span id="LC790" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If (xi, co, <span class="idiff left right">wrw</span>) <- flatten mode ev ty, then co :: xi ~r ty</span></span>
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<pre style="margin: 0;">+<span id="LC793" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If (xi, co, <span class="idiff left right">rewriters</span>) <- flatten mode ev ty, then co :: xi ~r ty</span></span>
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<pre style="margin: 0;"> <span id="LC794" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- where r is the role in @ev@. If @mode@ is 'FM_FlattenAll',</span></span>
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<pre style="margin: 0;"> <span id="LC795" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- then 'xi' is almost function-free (Note [Almost function-free]</span></span>
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<pre style="margin: 0;"> <span id="LC796" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- in GHC.Tc.Types).</span></span>
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<pre style="margin: 0;">-<span id="LC794" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">wrw is True <=> a wanted rewrote a wanted.</span></span></span>
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<pre style="margin: 0;">+<span id="LC797" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">rewriters is the set of coercion holes that have been used to rewrite</span></span></span>
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<pre style="margin: 0;"> <span id="LC798" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Wanteds rewrite wanteds] in GHC.Tc.Types.Constraint</span></span>
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<pre style="margin: 0;"> <span id="LC799" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- and Note [Flattening wanteds]</span></span>
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<pre style="margin: 0;"> <span id="LC800" class="line" lang="haskell"><span class="n" style="color: #333;">flatten</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FlattenMode</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span></span>
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<pre style="margin: 0;">-<span id="LC798" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Xi</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcCoercion</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">WRWFlag</span></span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC801" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Xi</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcCoercion</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">RewriterSet</span></span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC802" class="line" lang="haskell"><span class="n" style="color: #333;">flatten</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC803" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"flatten {"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">mode</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC801" class="line" lang="haskell"> <span class="p">;</span> <span class="p">((</span><span class="n" style="color: #333;">ty'</span><span class="p">,</span> <span class="n" style="color: #333;">co</span><span class="p">),</span> <span class="n" style="color: #333;">wrw</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">runFlattenCtEv</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">ev</span> <span class="p">(</span><span class="n" style="color: #333;">flatten_one</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC802" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"flatten }"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty'</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">pp_wrw</span> <span class="n" style="color: #333;">wrw</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC803" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">ty'</span><span class="p">,</span> <span class="n" style="color: #333;">co</span><span class="p">,</span> <span class="n" style="color: #333;">wrw</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC804" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC805" class="line" lang="haskell"> <span class="n" style="color: #333;">pp_wrw</span> <span class="kt" style="color: #458; font-weight: 600;">YesWRW</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"YesWRW: wanted rewrote wanted"</span></span>
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<pre style="margin: 0;">-<span id="LC806" class="line" lang="haskell"> <span class="n" style="color: #333;">pp_wrw</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">empty</span></span>
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<pre style="margin: 0;">+<span id="LC804" class="line" lang="haskell"> <span class="p">;</span> <span class="p">((</span><span class="n" style="color: #333;">ty'</span><span class="p">,</span> <span class="n" style="color: #333;">co</span><span class="p">),</span> <span class="n" style="color: #333;">rewriters</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">runFlattenCtEv</span> <span class="n" style="color: #333;">mode</span> <span class="n" style="color: #333;">ev</span> <span class="p">(</span><span class="n" style="color: #333;">flatten_one</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC805" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"flatten }"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty'</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">rewriters</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC806" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">ty'</span><span class="p">,</span> <span class="n" style="color: #333;">co</span><span class="p">,</span> <span class="n" style="color: #333;">rewriters</span><span class="p">)</span> <span class="p">}</span></span>
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807
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<pre style="margin: 0;"> <span id="LC807" class="line" lang="haskell"></span>
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808
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<pre style="margin: 0;"> <span id="LC808" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Apply the inert set as an *inert generalised substitution* to</span></span>
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<pre style="margin: 0;"> <span id="LC809" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- a variable, zonking along the way.</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">@@ -825,7 +825,7 @@ rewriteTyVar tv</td>
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<pre style="margin: 0;"> <span id="LC825" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC826" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Flattening]</span></span>
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<pre style="margin: 0;"> <span id="LC827" class="line" lang="haskell"><span class="n" style="color: #333;">flattenArgsNom</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">]</span></span>
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828
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<pre style="margin: 0;">-<span id="LC828" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">Xi</span><span class="p">],</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcCoercion</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">TcCoercionN</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">WRWFlag</span></span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC828" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">Xi</span><span class="p">],</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcCoercion</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">TcCoercionN</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">RewriterSet</span></span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC829" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Externally-callable, hence runFlatten</span></span>
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<pre style="margin: 0;"> <span id="LC830" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Flatten a vector of types all at once; in fact they are</span></span>
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<pre style="margin: 0;"> <span id="LC831" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- always the arguments of type family or class, so</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">@@ -841,10 +841,10 @@ flattenArgsNom :: CtEvidence -> TyCon -> [TcType]</td>
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<pre style="margin: 0;"> <span id="LC841" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Flattening wanteds]</span></span>
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<pre style="margin: 0;"> <span id="LC842" class="line" lang="haskell"><span class="n" style="color: #333;">flattenArgsNom</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">tys</span></span>
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843
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<pre style="margin: 0;"> <span id="LC843" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"flatten_args {"</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tys</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC844" class="line" lang="haskell"> <span class="p">;</span> <span class="p">((</span><span class="n" style="color: #333;">tys'</span><span class="p">,</span> <span class="n" style="color: #333;">cos</span><span class="p">,</span> <span class="n" style="color: #333;">kind_co</span><span class="p">),</span> <span class="n" style="color: #333;"><span class="idiff left right">wrw</span></span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC844" class="line" lang="haskell"> <span class="p">;</span> <span class="p">((</span><span class="n" style="color: #333;">tys'</span><span class="p">,</span> <span class="n" style="color: #333;">cos</span><span class="p">,</span> <span class="n" style="color: #333;">kind_co</span><span class="p">),</span> <span class="n" style="color: #333;"><span class="idiff left right">rewriters</span></span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC845" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">runFlattenCtEv</span> <span class="kt" style="color: #458; font-weight: 600;">FM_FlattenAll</span> <span class="n" style="color: #333;">ev</span> <span class="p">(</span><span class="n" style="color: #333;">flatten_args_tc</span> <span class="n" style="color: #333;">tc</span> <span class="p">(</span><span class="n" style="color: #333;">repeat</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span><span class="p">)</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC846" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"flatten }"</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tys'</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC847" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">tys'</span><span class="p">,</span> <span class="n" style="color: #333;">cos</span><span class="p">,</span> <span class="n" style="color: #333;">kind_co</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left right">wrw</span></span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC847" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">tys'</span><span class="p">,</span> <span class="n" style="color: #333;">cos</span><span class="p">,</span> <span class="n" style="color: #333;">kind_co</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left right">rewriters</span></span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC848" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC849" class="line" lang="haskell"><span class="cd">-- | Flatten a type w.r.t. nominal equality. This is useful to rewrite</span></span>
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<pre style="margin: 0;"> <span id="LC850" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- a type w.r.t. any givens. It does not do type-family reduction. This</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">@@ -1461,7 +1461,7 @@ flatten_exact_fam_app_fully tc tys</td>
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<pre style="margin: 0;"> <span id="LC1461" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;"> <span id="LC1462" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getLoc</span></span>
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<pre style="margin: 0;"> <span id="LC1463" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">ev</span><span class="p">,</span> <span class="n" style="color: #333;">co</span><span class="p">,</span> <span class="n" style="color: #333;">fsk</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">liftTcS</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC1464" class="line" lang="haskell"> <span class="n" style="color: #333;">newFlattenSkolem</span> <span class="n" style="color: #333;">cur_flav</span> <span class="n" style="color: #333;">loc</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CtReportAsSame</span></span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">xis</span></span>
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<pre style="margin: 0;">+<span id="LC1464" class="line" lang="haskell"> <span class="n" style="color: #333;">newFlattenSkolem</span> <span class="n" style="color: #333;">cur_flav</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;"><span class="idiff left right">emptyRewriterSet</span></span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">xis</span></span>
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<pre style="margin: 0;"> <span id="LC1465" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1466" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The new constraint (F xis ~ fsk) is not</span></span>
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<pre style="margin: 0;"> <span id="LC1467" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- necessarily inert (e.g. the LHS may be a</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">@@ -1660,7 +1660,7 @@ flatten_tyvar2 tv fr@(_, eq_rel)</td>
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<pre style="margin: 0;"> <span id="LC1660" class="line" lang="haskell"> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">sep</span> <span class="p">[</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">mode</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tv</span><span class="p">,</span> <span class="n" style="color: #333;">equals</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">rhs_ty</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC1661" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ctev</span></span>
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1662
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<pre style="margin: 0;"> <span id="LC1662" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"wanted_rewrite_wanted:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">wrw</span> <span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC1663" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;"><span class="idiff left">recordWRW</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">wrw</span></span></span>
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<pre style="margin: 0;">+<span id="LC1663" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;"><span class="idiff left">when</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">wrw</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">recordRewriter</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">ctev</span></span></span>
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1664
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<pre style="margin: 0;"> <span id="LC1664" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1665" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">rewrite_co1</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkSymCo</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvCoercion</span> <span class="n" style="color: #333;">ctev</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1666" class="line" lang="haskell"> <span class="n" style="color: #333;">rewrite_co</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="p">(</span><span class="n" style="color: #333;">ct_eq_rel</span><span class="p">,</span> <span class="n" style="color: #333;">eq_rel</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/f5433f0bc06f65deb96a44b62d47875ec4bc5b38...5d3804aec65f0801363c28ca3bb8a15f4ef3e6db#f639b0b31b7245cb7d34ac190b798f5ec1c7da2e"><strong>compiler/GHC/Tc/Solver/Interact.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -52,6 +52,7 @@ import Data.List( partition, deleteFirstsBy )</td>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.SrcLoc</span></span>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var.Env</span></span>
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC55" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="k" style="font-weight: 600;">qualified</span> <span class="nn" style="color: #555;">Data.Semigroup</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">S</span></span>
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Monad</span></span>
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<pre style="margin: 0;"> <span id="LC57" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.Maybe</span><span class="p">(</span> <span class="n" style="color: #333;">isJust</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC58" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.Pair</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Pair</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">))</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1124,7 +1125,7 @@ shortCutSolver dflags ev_w ev_i</td>
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<pre style="margin: 0;"> <span id="LC1125" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">lift</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"shortCutSolver: found instance"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">preds</span><span class="p">)</span></span>
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1126
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<pre style="margin: 0;"> <span id="LC1126" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">loc'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lift</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">checkInstanceOK</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">what</span> <span class="n" style="color: #333;">pred</span></span>
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1126
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1127
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<pre style="margin: 0;"> <span id="LC1127" class="line" lang="haskell"></span>
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1127
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<pre style="margin: 0;">-<span id="LC1127" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">evc_vs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">new_wanted_cached</span> <span class="n" style="color: #333;">loc'</span> <span class="n" style="color: #333;">solved_dicts'</span><span class="p">)</span> <span class="n" style="color: #333;">preds</span></span>
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<pre style="margin: 0;">+<span id="LC1128" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">evc_vs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">new_wanted_cached</span> <span class="n" style="color: #333;"><span class="idiff left">ev</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">loc'</span> <span class="n" style="color: #333;">solved_dicts'</span><span class="p">)</span> <span class="n" style="color: #333;">preds</span></span>
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1128
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1129
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<pre style="margin: 0;"> <span id="LC1129" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Emit work for subgoals but use our local cache</span></span>
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1129
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1130
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<pre style="margin: 0;"> <span id="LC1130" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- so we can solve recursive dictionaries.</span></span>
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1131
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<pre style="margin: 0;"> <span id="LC1131" 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">@@ -1143,12 +1144,13 @@ shortCutSolver dflags ev_w ev_i</td>
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<pre style="margin: 0;"> <span id="LC1144" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Use a local cache of solved dicts while emitting EvVars for new work</span></span>
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1145
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<pre style="margin: 0;"> <span id="LC1145" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We bail out of the entire computation if we need to emit an EvVar for</span></span>
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<pre style="margin: 0;"> <span id="LC1146" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- a subgoal that isn't a ClassPred.</span></span>
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<pre style="margin: 0;">-<span id="LC1146" class="line" lang="haskell"> <span class="n" style="color: #333;">new_wanted_cached</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DictMap</span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcPredType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeNew</span></span>
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<pre style="margin: 0;">-<span id="LC1147" class="line" lang="haskell"> <span class="n" style="color: #333;">new_wanted_cached</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">cache</span> <span class="n" style="color: #333;">pty</span></span>
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<pre style="margin: 0;">+<span id="LC1147" class="line" lang="haskell"> <span class="n" style="color: #333;">new_wanted_cached</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span></span>
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<pre style="margin: 0;">+<span id="LC1148" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">DictMap</span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcPredType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeT</span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeNew</span></span>
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<pre style="margin: 0;">+<span id="LC1149" class="line" lang="haskell"> <span class="n" style="color: #333;">new_wanted_cached</span> <span class="n" style="color: #333;">ev_w</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">cache</span> <span class="n" style="color: #333;">pty</span></span>
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1150
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<pre style="margin: 0;"> <span id="LC1150" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ClassPred</span> <span class="n" style="color: #333;">cls</span> <span class="n" style="color: #333;">tys</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">classifyPredType</span> <span class="n" style="color: #333;">pty</span></span>
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1151
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<pre style="margin: 0;"> <span id="LC1151" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">lift</span> <span class="o" style="font-weight: 600;">$</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">findDict</span> <span class="n" style="color: #333;">cache</span> <span class="n" style="color: #333;">loc_w</span> <span class="n" style="color: #333;">cls</span> <span class="n" style="color: #333;">tys</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1150
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1152
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<pre style="margin: 0;"> <span id="LC1152" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">ctev</span> <span class="o" style="font-weight: 600;">-></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;">Cached</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvExpr</span> <span class="n" style="color: #333;">ctev</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 class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Fresh</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">newWantedNC</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">pty</span></span>
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<pre style="margin: 0;">+<span id="LC1153" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Fresh</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">newWantedNC</span> <span class="n" style="color: #333;">loc</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">ctEvRewriters</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ev_w</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">pty</span></span>
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1152
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1154
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<pre style="margin: 0;"> <span id="LC1154" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mzero</span></span>
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1155
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<pre style="margin: 0;"> <span id="LC1155" class="line" lang="haskell"></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;">addFunDepWork</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">InertCans</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Class</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1174" 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="1176" 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">@@ -1174,8 +1176,8 @@ addFunDepWork inerts work_ev cls</td>
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1174
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1176
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<pre style="margin: 0;"> <span id="LC1176" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">pprCtLoc</span> <span class="n" style="color: #333;">inert_loc</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">isGivenLoc</span> <span class="n" style="color: #333;">inert_loc</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1177" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">pprCtLoc</span> <span class="n" style="color: #333;">derived_loc</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">isGivenLoc</span> <span class="n" style="color: #333;">derived_loc</span><span class="p">)</span> <span class="p">])</span> <span class="p">;</span></span>
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1176
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1178
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<pre style="margin: 0;"> <span id="LC1178" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1177" class="line" lang="haskell"> <span class="n" style="color: #333;">emitFunDepDeriveds</span> <span class="o" style="font-weight: 600;">$</span></span>
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1178
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<pre style="margin: 0;">-<span id="LC1178" class="line" lang="haskell"> <span class="n" style="color: #333;">improveFromAnother</span> <span class="n" style="color: #333;"><span class="idiff left right">derived_loc</span></span> <span class="n" style="color: #333;">inert_pred</span> <span class="n" style="color: #333;">work_pred</span></span>
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1179
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<pre style="margin: 0;">+<span id="LC1179" class="line" lang="haskell"> <span class="n" style="color: #333;">emitFunDepDeriveds</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">ctEvRewriters</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">work_ev</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff right"> </span><span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC1180" class="line" lang="haskell"> <span class="n" style="color: #333;">improveFromAnother</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">derived_loc</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inert_rewriters</span></span><span class="p"><span class="idiff right">)</span></span> <span class="n" style="color: #333;">inert_pred</span> <span class="n" style="color: #333;">work_pred</span></span>
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1179
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1181
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<pre style="margin: 0;"> <span id="LC1181" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We don't really rewrite tys2, see below _rewritten_tys2, so that's ok</span></span>
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1180
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1182
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<pre style="margin: 0;"> <span id="LC1182" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: We do create FDs for given to report insoluble equations that arise</span></span>
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1181
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1183
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<pre style="margin: 0;"> <span id="LC1183" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- from pairs of Givens, and also because of floating when we approximate</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1189" 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">@@ -1187,6 +1189,7 @@ addFunDepWork inerts work_ev cls</td>
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1187
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1189
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<pre style="margin: 0;"> <span id="LC1189" class="line" lang="haskell"> <span class="n" style="color: #333;">inert_ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctEvidence</span> <span class="n" style="color: #333;">inert_ct</span></span>
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1188
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1190
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<pre style="margin: 0;"> <span id="LC1190" class="line" lang="haskell"> <span class="n" style="color: #333;">inert_pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctEvPred</span> <span class="n" style="color: #333;">inert_ev</span></span>
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1191
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<pre style="margin: 0;"> <span id="LC1191" class="line" lang="haskell"> <span class="n" style="color: #333;">inert_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctEvLoc</span> <span class="n" style="color: #333;">inert_ev</span></span>
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1192
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<pre style="margin: 0;">+<span id="LC1192" class="line" lang="haskell"> <span class="n" style="color: #333;">inert_rewriters</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctRewriters</span> <span class="n" style="color: #333;">inert_ct</span></span>
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1190
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1193
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<pre style="margin: 0;"> <span id="LC1193" class="line" lang="haskell"> <span class="n" style="color: #333;">derived_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">work_loc</span> <span class="p">{</span> <span class="n" style="color: #333;">ctl_depth</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctl_depth</span> <span class="n" style="color: #333;">work_loc</span> <span class="p">`</span><span class="n" style="color: #333;">maxSubGoalDepth</span><span class="p">`</span></span>
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1191
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1194
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<pre style="margin: 0;"> <span id="LC1194" class="line" lang="haskell"> <span class="n" style="color: #333;">ctl_depth</span> <span class="n" style="color: #333;">inert_loc</span></span>
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1192
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1195
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<pre style="margin: 0;"> <span id="LC1195" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctl_origin</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FunDepOrigin1</span> <span class="n" style="color: #333;">work_pred</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1355" 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="1358" 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">@@ -1355,7 +1358,7 @@ improveLocalFunEqs work_ev inerts fam_tc args fsk</td>
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1355
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1358
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<pre style="margin: 0;"> <span id="LC1358" class="line" lang="haskell"> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Eqns:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">eqns</span></span>
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1356
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1359
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<pre style="margin: 0;"> <span id="LC1359" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Candidates:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">funeqs_for_tc</span></span>
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1357
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1360
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<pre style="margin: 0;"> <span id="LC1360" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Inert eqs:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">inert_eqs</span> <span class="n" style="color: #333;">inerts</span><span class="p">)</span> <span class="p">]</span></span>
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1358
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<pre style="margin: 0;">-<span id="LC1358" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">emitFunDepDeriveds</span> <span class="n" style="color: #333;">eqns</span> <span class="p">}</span></span>
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1361
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<pre style="margin: 0;">+<span id="LC1361" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">emitFunDepDeriveds</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">ctEvRewriters</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">work_ev</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">eqns</span> <span class="p">}</span></span>
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1359
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1362
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<pre style="margin: 0;"> <span id="LC1362" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span> <span class="p">}</span></span>
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1360
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1363
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<pre style="margin: 0;"> <span id="LC1363" class="line" lang="haskell"></span>
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1361
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1364
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<pre style="margin: 0;"> <span id="LC1364" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1369" 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">@@ -1366,7 +1369,7 @@ improveLocalFunEqs work_ev inerts fam_tc args fsk</td>
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1366
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1369
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<pre style="margin: 0;"> <span id="LC1369" class="line" lang="haskell"> <span class="n" style="color: #333;">fam_inj_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyConInjectivityInfo</span> <span class="n" style="color: #333;">fam_tc</span></span>
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1367
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1370
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<pre style="margin: 0;"> <span id="LC1370" class="line" lang="haskell"></span>
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1368
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1371
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<pre style="margin: 0;"> <span id="LC1371" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--------------------</span></span>
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1369
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<pre style="margin: 0;">-<span id="LC1369" class="line" lang="haskell"> <span class="n" style="color: #333;">improvement_eqns</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">FunDepEqn</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CtLoc</span></span><span class="p">]</span></span>
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1372
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<pre style="margin: 0;">+<span id="LC1372" class="line" lang="haskell"> <span class="n" style="color: #333;">improvement_eqns</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">FunDepEqn</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">CtLoc</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">RewriterSet</span></span><span class="p"><span class="idiff right">)</span>]</span></span>
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1370
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1373
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<pre style="margin: 0;"> <span id="LC1373" class="line" lang="haskell"> <span class="n" style="color: #333;">improvement_eqns</span></span>
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1371
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1374
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<pre style="margin: 0;"> <span id="LC1374" 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="n" style="color: #333;">ops</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">isBuiltInSynFamTyCon_maybe</span> <span class="n" style="color: #333;">fam_tc</span></span>
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1372
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1375
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<pre style="margin: 0;"> <span id="LC1375" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- Try built-in families, notably for arithmethic</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1393" 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">@@ -1390,6 +1393,7 @@ improveLocalFunEqs work_ev inerts fam_tc args fsk</td>
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1390
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1393
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<pre style="margin: 0;"> <span id="LC1393" class="line" lang="haskell"></span>
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1391
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1394
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<pre style="margin: 0;"> <span id="LC1394" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--------------------</span></span>
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1392
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<td class="diff-line-num new_line" data-linenumber="1395" 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">
1395
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<pre style="margin: 0;"> <span id="LC1395" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Type inference for type families with injectivity]</span></span>
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1396
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<pre style="margin: 0;">+<span id="LC1396" class="line" lang="haskell"> <span class="n" style="color: #333;">do_one_injective</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">FunDepEqn</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CtLoc</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">RewriterSet</span><span class="p">)]</span></span>
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1393
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1397
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<pre style="margin: 0;"> <span id="LC1397" class="line" lang="haskell"> <span class="n" style="color: #333;">do_one_injective</span> <span class="n" style="color: #333;">inj_args</span> <span class="n" style="color: #333;">rhs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CFunEqCan</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_tyargs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">inert_args</span></span>
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1394
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1398
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<pre style="margin: 0;"> <span id="LC1398" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cc_fsk</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ifsk</span><span class="p">,</span> <span class="n" style="color: #333;">cc_ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">inert_ev</span> <span class="p">})</span></span>
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1395
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1399
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<pre style="margin: 0;"> <span id="LC1399" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isImprovable</span> <span class="n" style="color: #333;">inert_ev</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">@@ -1405,15 +1409,16 @@ improveLocalFunEqs work_ev inerts fam_tc args fsk</td>
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<pre style="margin: 0;"> <span id="LC1409" class="line" lang="haskell"> <span class="n" style="color: #333;">do_one_injective</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"interactFunEq 2"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fam_tc</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1410" class="line" lang="haskell"></span>
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1411
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<pre style="margin: 0;"> <span id="LC1411" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--------------------</span></span>
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<pre style="margin: 0;">-<span id="LC1408" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_fd_eqns</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TypeEqn</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">FunDepEqn</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CtLoc</span></span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC1412" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_fd_eqns</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TypeEqn</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">FunDepEqn</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">CtLoc</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">RewriterSet</span></span><span class="p"><span class="idiff right">)</span>]</span></span>
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<pre style="margin: 0;"> <span id="LC1413" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_fd_eqns</span> <span class="n" style="color: #333;">inert_ev</span> <span class="n" style="color: #333;">eqns</span></span>
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<pre style="margin: 0;"> <span id="LC1414" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">eqns</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;"> <span id="LC1415" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span> <span class="kt" style="color: #458; font-weight: 600;">FDEqn</span> <span class="p">{</span> <span class="n" style="color: #333;">fd_qtvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span> <span class="n" style="color: #333;">fd_eqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eqns</span></span>
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<pre style="margin: 0;"> <span id="LC1416" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fd_pred1</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">work_pred</span></span>
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<pre style="margin: 0;"> <span id="LC1417" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fd_pred2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctEvPred</span> <span class="n" style="color: #333;">inert_ev</span></span>
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<pre style="margin: 0;">-<span id="LC1414" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fd_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left right">loc</span></span> <span class="p">}</span> <span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC1418" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">fd_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">loc</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inert_rewriters</span></span><span class="p"><span class="idiff right">)</span></span> <span class="p">}</span> <span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC1419" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC1416" class="line" lang="haskell"> <span class="n" style="color: #333;">inert_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctEvLoc</span> <span class="n" style="color: #333;">inert_ev</span></span>
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<pre style="margin: 0;">+<span id="LC1420" class="line" lang="haskell"> <span class="n" style="color: #333;">inert_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctEvLoc</span> <span class="n" style="color: #333;">inert_ev</span></span>
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<pre style="margin: 0;">+<span id="LC1421" class="line" lang="haskell"> <span class="n" style="color: #333;">inert_rewriters</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctEvRewriters</span> <span class="n" style="color: #333;">inert_ev</span></span>
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<pre style="margin: 0;"> <span id="LC1422" 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;">inert_loc</span> <span class="p">{</span> <span class="n" style="color: #333;">ctl_depth</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctl_depth</span> <span class="n" style="color: #333;">inert_loc</span> <span class="p">`</span><span class="n" style="color: #333;">maxSubGoalDepth</span><span class="p">`</span></span>
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<pre style="margin: 0;"> <span id="LC1423" class="line" lang="haskell"> <span class="n" style="color: #333;">ctl_depth</span> <span class="n" style="color: #333;">work_loc</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1424" 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">@@ -1784,23 +1789,26 @@ as the fundeps.</td>
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<pre style="margin: 0;"> <span id="LC1789" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">#7875 is a case in point.</span></span>
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<pre style="margin: 0;"> <span id="LC1790" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;"> <span id="LC1791" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1787" class="line" lang="haskell"><span class="n" style="color: #333;">emitFunDepDeriveds</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">FunDepEqn</span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC1792" class="line" lang="haskell"><span class="n" style="color: #333;">emitFunDepDeriveds</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">RewriterSet</span> <span class="c1" style="color: #998; font-style: italic;">-- from the work item</span></span>
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<pre style="margin: 0;">+<span id="LC1793" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">FunDepEqn</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CtLoc</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">RewriterSet</span><span class="p">)]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC1794" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [FunDep and implicit parameter reactions]</span></span>
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<pre style="margin: 0;">-<span id="LC1789" class="line" lang="haskell"><span class="n" style="color: #333;">emitFunDepDeriveds</span> <span class="n" style="color: #333;">fd_eqns</span></span>
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<pre style="margin: 0;">+<span id="LC1795" class="line" lang="haskell"><span class="n" style="color: #333;">emitFunDepDeriveds</span> <span class="n" style="color: #333;"><span class="idiff left">work_rewriters</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">fd_eqns</span></span>
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<pre style="margin: 0;"> <span id="LC1796" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapM_</span> <span class="n" style="color: #333;">do_one_FDEqn</span> <span class="n" style="color: #333;">fd_eqns</span></span>
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<pre style="margin: 0;"> <span id="LC1797" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC1792" class="line" lang="haskell"> <span class="n" style="color: #333;">do_one_FDEqn</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FDEqn</span> <span class="p">{</span> <span class="n" style="color: #333;">fd_qtvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tvs</span><span class="p">,</span> <span class="n" style="color: #333;">fd_eqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eqs</span><span class="p">,</span> <span class="n" style="color: #333;">fd_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left right">loc</span></span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC1798" class="line" lang="haskell"> <span class="n" style="color: #333;">do_one_FDEqn</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FDEqn</span> <span class="p">{</span> <span class="n" style="color: #333;">fd_qtvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tvs</span><span class="p">,</span> <span class="n" style="color: #333;">fd_eqs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eqs</span><span class="p">,</span> <span class="n" style="color: #333;">fd_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">loc</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rewriters</span></span><span class="p"><span class="idiff right">)</span></span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC1799" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">tvs</span> <span class="c1" style="color: #998; font-style: italic;">-- Common shortcut</span></span>
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<pre style="margin: 0;"> <span id="LC1800" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"emitFunDepDeriveds 1"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">ctl_depth</span> <span class="n" style="color: #333;">loc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">eqs</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">isGivenLoc</span> <span class="n" style="color: #333;">loc</span><span class="p">))</span></span>
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<pre style="margin: 0;">-<span id="LC1795" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mapM_</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">unifyDerived</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">loc</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nominal</span></span><span class="p">)</span> <span class="n" style="color: #333;">eqs</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC1801" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mapM_</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left">\</span></span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Pair</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty1</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty2</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">unifyWanted</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">all_rewriters</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">loc</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Nominal</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty1</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">ty2</span></span><span class="p">)</span> <span class="n" style="color: #333;">eqs</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1802" 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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1797
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1803
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<pre style="margin: 0;"> <span id="LC1803" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"emitFunDepDeriveds 2"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">ctl_depth</span> <span class="n" style="color: #333;">loc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tvs</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">eqs</span><span class="p">)</span></span>
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1798
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1804
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<pre style="margin: 0;"> <span id="LC1804" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">subst</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">instFlexi</span> <span class="n" style="color: #333;">tvs</span> <span class="c1" style="color: #998; font-style: italic;">-- Takes account of kind substitution</span></span>
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1799
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<pre style="margin: 0;">-<span id="LC1799" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mapM_</span> <span class="p">(</span><span class="n" style="color: #333;">do_one_eq</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">subst</span><span class="p">)</span> <span class="n" style="color: #333;">eqs</span> <span class="p">}</span></span>
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1805
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<pre style="margin: 0;">+<span id="LC1805" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mapM_</span> <span class="p">(</span><span class="n" style="color: #333;">do_one_eq</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">all_rewriters</span> <span class="n" style="color: #333;">subst</span><span class="p">)</span> <span class="n" style="color: #333;">eqs</span> <span class="p">}</span></span>
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1806
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<pre style="margin: 0;">+<span id="LC1806" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1807
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<pre style="margin: 0;">+<span id="LC1807" class="line" lang="haskell"> <span class="n" style="color: #333;">all_rewriters</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">work_rewriters</span> <span class="kt" style="color: #458; font-weight: 600;">S</span><span class="o" style="font-weight: 600;">.<></span> <span class="n" style="color: #333;">rewriters</span></span>
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1800
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1808
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<pre style="margin: 0;"> <span id="LC1808" class="line" lang="haskell"></span>
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1801
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<pre style="margin: 0;">-<span id="LC1801" class="line" lang="haskell"> <span class="n" style="color: #333;">do_one_eq</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">subst</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Pair</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span></span>
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1802
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<pre style="margin: 0;">-<span id="LC1802" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unify<span class="idiff left">Derived</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">loc</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Nominal</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff right">$</span></span></span>
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1803
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<pre style="margin: 0;">-<span id="LC1803" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Pair</span></span> <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;">substTyUnchecked</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">ty1</span><span class="p">)</span> <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;">substTyUnchecked</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span></span>
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1809
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<pre style="margin: 0;">+<span id="LC1809" class="line" lang="haskell"> <span class="n" style="color: #333;">do_one_eq</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;"><span class="idiff left">rewriters</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">subst</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Pair</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span></span>
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1810
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<pre style="margin: 0;">+<span id="LC1810" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unify<span class="idiff left">Wanted</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rewriters</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">loc</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nominal</span></span></span>
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<pre style="margin: 0;">+<span id="LC1811" class="line" lang="haskell"> <span class="idiff left right"> </span> <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;">substTyUnchecked</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">ty1</span><span class="p">)</span> <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;">substTyUnchecked</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span></span>
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1804
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1812
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<pre style="margin: 0;"> <span id="LC1812" class="line" lang="haskell"></span>
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1805
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1813
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<pre style="margin: 0;"> <span id="LC1813" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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1806
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1814
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<pre style="margin: 0;"> <span id="LC1814" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">**********************************************************************</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1985" 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="1993" 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">@@ -1985,7 +1993,7 @@ reduce_top_fun_eq old_ev fsk (ax_co, rhs_ty)</td>
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1985
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1993
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<pre style="margin: 0;"> <span id="LC1993" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT2</span><span class="p">(</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">fsk</span> <span class="p">`</span><span class="n" style="color: #333;">elemVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">tyCoVarsOfType</span> <span class="n" style="color: #333;">rhs_ty</span><span class="p">)</span></span>
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<td class="diff-line-num old_line" data-linenumber="1986" 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">
1986
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1994
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<pre style="margin: 0;"> <span id="LC1994" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">old_ev</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="p">)</span></span>
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1987
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1995
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<pre style="margin: 0;"> <span id="LC1995" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Guaranteed by Note [FunEq occurs-check principle]</span></span>
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1988
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<pre style="margin: 0;">-<span id="LC1988" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">rhs_xi</span><span class="p">,</span> <span class="n" style="color: #333;">flatten_co</span><span class="p">,</span> <span class="n" style="color: #333;">_<span class="idiff left right">wrw</span></span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">flatten</span> <span class="kt" style="color: #458; font-weight: 600;">FM_FlattenAll</span> <span class="n" style="color: #333;">old_ev</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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1996
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<pre style="margin: 0;">+<span id="LC1996" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">rhs_xi</span><span class="p">,</span> <span class="n" style="color: #333;">flatten_co</span><span class="p">,</span> <span class="n" style="color: #333;">_<span class="idiff left right">rewriters</span></span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">flatten</span> <span class="kt" style="color: #458; font-weight: 600;">FM_FlattenAll</span> <span class="n" style="color: #333;">old_ev</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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1989
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1997
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<pre style="margin: 0;"> <span id="LC1997" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- flatten_co :: rhs_xi ~ rhs_ty</span></span>
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1990
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<td class="diff-line-num new_line" data-linenumber="1998" 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">
1998
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<pre style="margin: 0;"> <span id="LC1998" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Flatten when discharging CFunEqCan]</span></span>
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1991
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<td class="diff-line-num new_line" data-linenumber="1999" 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">
1999
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<pre style="margin: 0;"> <span id="LC1999" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">total_co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ax_co</span> <span class="p">`</span><span class="n" style="color: #333;">mkTcTransCo</span><span class="p">`</span> <span class="n" style="color: #333;">mkTcSymCo</span> <span class="n" style="color: #333;">flatten_co</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2008" 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="2016" 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">@@ -2008,11 +2016,12 @@ improveTopFunEqs ev fam_tc args fsk</td>
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2008
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2016
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<pre style="margin: 0;"> <span id="LC2016" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">eqns</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">improve_top_fun_eqs</span> <span class="n" style="color: #333;">fam_envs</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">args</span> <span class="n" style="color: #333;">rhs</span></span>
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2009
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2017
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<pre style="margin: 0;"> <span id="LC2017" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"improveTopFunEqs"</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fam_tc</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">args</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">rhs</span></span>
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2010
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2018
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<pre style="margin: 0;"> <span id="LC2018" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">eqns</span> <span class="p">])</span></span>
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2011
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<pre style="margin: 0;">-<span id="LC2011" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mapM_</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">unifyDerived</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">loc</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">Nominal</span></span><span class="p">)</span> <span class="n" style="color: #333;">eqns</span> <span class="p">}</span></span>
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2019
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<pre style="margin: 0;">+<span id="LC2019" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">mapM_</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left">\</span></span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Pair</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty1</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty2</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">unifyWanted</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">rewriters</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">loc</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Nominal</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty1</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">ty2</span></span><span class="p">)</span> <span class="n" style="color: #333;">eqns</span> <span class="p">}</span></span>
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2012
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2020
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<pre style="margin: 0;"> <span id="LC2020" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2013
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2021
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<pre style="margin: 0;"> <span id="LC2021" 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;">bumpCtLocDepth</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvLoc</span> <span class="n" style="color: #333;">ev</span><span class="p">)</span></span>
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2014
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2022
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<pre style="margin: 0;"> <span id="LC2022" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ToDo: this location is wrong; it should be FunDepOrigin2</span></span>
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2015
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2023
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<pre style="margin: 0;"> <span id="LC2023" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See #14778</span></span>
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2024
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<pre style="margin: 0;">+<span id="LC2024" class="line" lang="haskell"> <span class="n" style="color: #333;">rewriters</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctEvRewriters</span> <span class="n" style="color: #333;">ev</span></span>
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2016
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2025
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<pre style="margin: 0;"> <span id="LC2025" class="line" lang="haskell"></span>
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2017
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2026
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<pre style="margin: 0;"> <span id="LC2026" class="line" lang="haskell"><span class="n" style="color: #333;">improve_top_fun_eqs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FamInstEnvs</span></span>
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2018
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2027
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<pre style="margin: 0;"> <span id="LC2027" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</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">@@ -2103,10 +2112,10 @@ shortCutReduction old_ev fsk ax_co fam_tc tc_args</td>
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2103
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2112
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<pre style="margin: 0;"> <span id="LC2112" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">evCoercion</span> <span class="p">(</span><span class="n" style="color: #333;">mkTcSymCo</span> <span class="n" style="color: #333;">ax_co</span></span>
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2104
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2113
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<pre style="margin: 0;"> <span id="LC2113" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">mkTcTransCo</span><span class="p">`</span> <span class="n" style="color: #333;">ctEvCoercion</span> <span class="n" style="color: #333;">old_ev</span><span class="p">)</span> <span class="p">)</span></span>
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2105
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2114
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<pre style="margin: 0;"> <span id="LC2114" class="line" lang="haskell"></span>
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2106
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<pre style="margin: 0;">-<span id="LC2106" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_re<span class="idiff left">port_as</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 right">report_a</span>s</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">-></span></span>
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2115
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<pre style="margin: 0;">+<span id="LC2115" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_re<span class="idiff left">writers</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 right">rewriter</span>s</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">-></span></span>
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2107
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2116
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<pre style="margin: 0;"> <span id="LC2116" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See TcCanonical Note [Equalities with incompatible kinds] about NoBlockSubst</span></span>
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2108
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2117
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<pre style="margin: 0;"> <span id="LC2117" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">new_ev</span><span class="p">,</span> <span class="n" style="color: #333;">new_co</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newWantedEq_SI</span> <span class="kt" style="color: #458; font-weight: 600;">NoBlockSubst</span> <span class="kt" style="color: #458; font-weight: 600;">WDeriv</span> <span class="n" style="color: #333;">deeper_loc</span></span>
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2109
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<pre style="margin: 0;">-<span id="LC2109" class="line" lang="haskell"> <span class="n" style="color: #333;">re<span class="idiff left right">port_a</span>s</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span></span>
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2118
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<pre style="margin: 0;">+<span id="LC2118" class="line" lang="haskell"> <span class="n" style="color: #333;">re<span class="idiff left right">writer</span>s</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span></span>
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2110
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2119
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<pre style="margin: 0;"> <span id="LC2119" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">tc_args</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">fsk</span><span class="p">)</span></span>
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2111
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2120
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<pre style="margin: 0;"> <span id="LC2120" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">setWantedEq</span> <span class="p">(</span><span class="n" style="color: #333;">ctev_dest</span> <span class="n" style="color: #333;">old_ev</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">ax_co</span> <span class="p">`</span><span class="n" style="color: #333;">mkTcTransCo</span><span class="p">`</span> <span class="n" style="color: #333;">new_co</span></span>
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2112
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2121
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<pre style="margin: 0;"> <span id="LC2121" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">new_ev</span> <span class="p">}</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2356" 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="2365" 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">@@ -2356,15 +2365,16 @@ doTopReactDict inerts work_item@(CDictCan { cc_ev = ev, cc_class = cls</td>
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2356
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2365
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<pre style="margin: 0;"> <span id="LC2365" class="line" lang="haskell"> <span class="n" style="color: #333;">try_fundep_improvement</span></span>
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2357
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2366
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<pre style="margin: 0;"> <span id="LC2366" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"try_fundeps"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">work_item</span><span class="p">)</span></span>
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2358
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2367
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<pre style="margin: 0;"> <span id="LC2367" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">instEnvs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getInstEnvs</span></span>
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2359
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<pre style="margin: 0;">-<span id="LC2359" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">emitFunDepDeriveds</span> <span class="o" style="font-weight: 600;">$</span></span>
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2368
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<pre style="margin: 0;">+<span id="LC2368" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">emitFunDepDeriveds</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">ctEvRewriters</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ev</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff right"> </span><span class="o" style="font-weight: 600;">$</span></span>
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2360
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2369
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<pre style="margin: 0;"> <span id="LC2369" class="line" lang="haskell"> <span class="n" style="color: #333;">improveFromInstEnv</span> <span class="n" style="color: #333;">instEnvs</span> <span class="n" style="color: #333;">mk_ct_loc</span> <span class="n" style="color: #333;">dict_pred</span> <span class="p">}</span></span>
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2370
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<pre style="margin: 0;"> <span id="LC2370" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2371" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_ct_loc</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PredType</span> <span class="c1" style="color: #998; font-style: italic;">-- From instance decl</span></span>
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<pre style="margin: 0;"> <span id="LC2372" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SrcSpan</span> <span class="c1" style="color: #998; font-style: italic;">-- also from instance deol</span></span>
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2364
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<pre style="margin: 0;">-<span id="LC2364" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CtLoc</span></span></span>
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<pre style="margin: 0;">+<span id="LC2373" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">CtLoc</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">RewriterSet</span></span><span class="p"><span class="idiff right">)</span></span></span>
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2374
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<pre style="margin: 0;"> <span id="LC2374" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_ct_loc</span> <span class="n" style="color: #333;">inst_pred</span> <span class="n" style="color: #333;">inst_loc</span></span>
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<pre style="margin: 0;">-<span id="LC2366" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dict_loc</span> <span class="p">{</span> <span class="n" style="color: #333;">ctl_origin</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FunDepOrigin2</span> <span class="n" style="color: #333;">dict_pred</span> <span class="n" style="color: #333;">dict_origin</span></span>
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2367
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<pre style="margin: 0;">-<span id="LC2367" class="line" lang="haskell"> <span class="n" style="color: #333;">inst_pred</span> <span class="n" style="color: #333;">inst_loc</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC2375" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span> <span class="n" style="color: #333;">dict_loc</span> <span class="p">{</span> <span class="n" style="color: #333;">ctl_origin</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FunDepOrigin2</span> <span class="n" style="color: #333;">dict_pred</span> <span class="n" style="color: #333;">dict_origin</span></span>
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<pre style="margin: 0;">+<span id="LC2376" class="line" lang="haskell"> <span class="n" style="color: #333;">inst_pred</span> <span class="n" style="color: #333;">inst_loc</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC2377" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">emptyRewriterSet</span> <span class="p">)</span></span>
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2378
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<pre style="margin: 0;"> <span id="LC2378" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2379" class="line" lang="haskell"><span class="n" style="color: #333;">doTopReactDict</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">w</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"doTopReactDict"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">w</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2380" 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">@@ -2392,7 +2402,7 @@ chooseInstance work_item</td>
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<pre style="margin: 0;"> <span id="LC2402" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Instances in no-evidence implications]</span></span>
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<pre style="margin: 0;"> <span id="LC2403" class="line" lang="haskell"> <span class="n" style="color: #333;">continueWith</span> <span class="n" style="color: #333;">work_item</span></span>
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<pre style="margin: 0;"> <span id="LC2404" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span></span>
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<pre style="margin: 0;">-<span id="LC2395" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">evc_vars</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">newWanted</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="n" style="color: #333;">ctRe<span class="idiff left right">portA</span>s</span> <span class="n" style="color: #333;">work_item</span><span class="p">))</span> <span class="n" style="color: #333;">theta</span></span>
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<pre style="margin: 0;">+<span id="LC2405" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">evc_vars</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">newWanted</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="n" style="color: #333;">ctRe<span class="idiff left right">writer</span>s</span> <span class="n" style="color: #333;">work_item</span><span class="p">))</span> <span class="n" style="color: #333;">theta</span></span>
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<pre style="margin: 0;"> <span id="LC2406" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">setEvBindIfWanted</span> <span class="n" style="color: #333;">ev</span> <span class="p">(</span><span class="n" style="color: #333;">mk_ev</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">getEvExpr</span> <span class="n" style="color: #333;">evc_vars</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC2407" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">emitWorkNC</span> <span class="p">(</span><span class="n" style="color: #333;">freshGoals</span> <span class="n" style="color: #333;">evc_vars</span><span class="p">)</span></span>
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2398
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2408
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<pre style="margin: 0;"> <span id="LC2408" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">stopWith</span> <span class="n" style="color: #333;">ev</span> <span class="s" style="color: #d14;">"Dict/Top (solved wanted)"</span> <span class="p">}</span> <span class="p">}</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/f5433f0bc06f65deb96a44b62d47875ec4bc5b38...5d3804aec65f0801363c28ca3bb8a15f4ef3e6db#0c6b585a8a21f8340a85ca2cef89c4b1bf5a8953"><strong>compiler/GHC/Tc/Solver/Monad.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -3201,10 +3201,10 @@ zonkTyCoVarKind tv = wrapTcS (TcM.zonkTyCoVarKind tv)</td>
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3201
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<pre style="margin: 0;"> <span id="LC3201" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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3202
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3202
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<pre style="margin: 0;"> <span id="LC3202" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">********************************************************************* -}</span></span>
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3203
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3203
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<pre style="margin: 0;"> <span id="LC3203" class="line" lang="haskell"></span>
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3204
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<pre style="margin: 0;">-<span id="LC3204" class="line" lang="haskell"><span class="n" style="color: #333;">newFlattenSkolem</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtFlavour</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CtReportAs</span></span></span>
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3204
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<pre style="margin: 0;">+<span id="LC3204" class="line" lang="haskell"><span class="n" style="color: #333;">newFlattenSkolem</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtFlavour</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">RewriterSet</span></span></span>
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3205
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3205
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<pre style="margin: 0;"> <span id="LC3205" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- F xis</span></span>
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3206
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3206
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<pre style="margin: 0;"> <span id="LC3206" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- [G/WD] x:: F xis ~ fsk</span></span>
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3207
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<pre style="margin: 0;">-<span id="LC3207" class="line" lang="haskell"><span class="n" style="color: #333;">newFlattenSkolem</span> <span class="n" style="color: #333;">flav</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">port_a</span>s</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">xis</span></span>
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3207
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<pre style="margin: 0;">+<span id="LC3207" class="line" lang="haskell"><span class="n" style="color: #333;">newFlattenSkolem</span> <span class="n" style="color: #333;">flav</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">writer</span>s</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">xis</span></span>
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3208
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3208
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<pre style="margin: 0;"> <span id="LC3208" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">stuff</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="n" style="color: #333;">ev</span><span class="p">,</span> <span class="n" style="color: #333;">co</span><span class="p">,</span> <span class="n" style="color: #333;">fsk</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">new_skolem</span></span>
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3209
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<pre style="margin: 0;"> <span id="LC3209" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">fsk_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">fsk</span></span>
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3210
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3210
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<pre style="margin: 0;"> <span id="LC3210" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">extendFlatCache</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">xis</span> <span class="p">(</span><span class="n" style="color: #333;">co</span><span class="p">,</span> <span class="n" style="color: #333;">fsk_ty</span><span class="p">,</span> <span class="n" style="color: #333;">ctEvFlavour</span> <span class="n" style="color: #333;">ev</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">@@ -3230,7 +3230,7 @@ newFlattenSkolem flav loc report_as tc xis</td>
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<pre style="margin: 0;"> <span id="LC3230" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">fmv</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">wrapTcS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcM</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">newFmvTyVar</span> <span class="n" style="color: #333;">fam_ty</span><span class="p">)</span></span>
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3231
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<pre style="margin: 0;"> <span id="LC3231" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See (2a) in TcCanonical</span></span>
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3232
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3232
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<pre style="margin: 0;"> <span id="LC3232" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Equalities with incompatible kinds]</span></span>
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3233
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<pre style="margin: 0;">-<span id="LC3233" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">ev</span><span class="p">,</span> <span class="n" style="color: #333;">hole_co</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newWantedEq_SI</span> <span class="kt" style="color: #458; font-weight: 600;">NoBlockSubst</span> <span class="kt" style="color: #458; font-weight: 600;">WDeriv</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">port_a</span>s</span></span>
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<pre style="margin: 0;">+<span id="LC3233" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">ev</span><span class="p">,</span> <span class="n" style="color: #333;">hole_co</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newWantedEq_SI</span> <span class="kt" style="color: #458; font-weight: 600;">NoBlockSubst</span> <span class="kt" style="color: #458; font-weight: 600;">WDeriv</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">writer</span>s</span></span>
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<pre style="margin: 0;"> <span id="LC3234" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">fam_ty</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">fmv</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC3235" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">ev</span><span class="p">,</span> <span class="n" style="color: #333;">hole_co</span><span class="p">,</span> <span class="n" style="color: #333;">fmv</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC3236" 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">@@ -3494,43 +3494,43 @@ newBoundEvVarId pred rhs</td>
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<pre style="margin: 0;"> <span id="LC3494" class="line" lang="haskell"><span class="n" style="color: #333;">newGivenEvVars</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">TcPredType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">EvTerm</span><span class="p">)]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC3495" class="line" lang="haskell"><span class="n" style="color: #333;">newGivenEvVars</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">pts</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">newGivenEvVar</span> <span class="n" style="color: #333;">loc</span><span class="p">)</span> <span class="n" style="color: #333;">pts</span></span>
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<pre style="margin: 0;"> <span id="LC3496" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC3497" class="line" lang="haskell"><span class="n" style="color: #333;">emitNewWantedEq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CtReportAs</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Role</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span></span>
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<pre style="margin: 0;">+<span id="LC3497" class="line" lang="haskell"><span class="n" style="color: #333;">emitNewWantedEq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">RewriterSet</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Role</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span></span>
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<pre style="margin: 0;"> <span id="LC3498" class="line" lang="haskell"><span class="cd">-- | Emit a new Wanted equality into the work-list</span></span>
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<pre style="margin: 0;">-<span id="LC3499" class="line" lang="haskell"><span class="n" style="color: #333;">emitNewWantedEq</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">port_a</span>s</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;">-<span id="LC3500" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">ev</span><span class="p">,</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newWantedEq</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">port_a</span>s</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;">+<span id="LC3499" class="line" lang="haskell"><span class="n" style="color: #333;">emitNewWantedEq</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">writer</span>s</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;">+<span id="LC3500" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">ev</span><span class="p">,</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newWantedEq</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">writer</span>s</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;"> <span id="LC3501" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">updWorkListTcS</span> <span class="p">(</span><span class="n" style="color: #333;">extendWorkListEq</span> <span class="p">(</span><span class="n" style="color: #333;">mkNonCanonical</span> <span class="n" style="color: #333;">ev</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC3502" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">co</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC3503" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3504" class="line" lang="haskell"><span class="cd">-- | Make a new equality CtEvidence</span></span>
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<pre style="margin: 0;">-<span id="LC3505" class="line" lang="haskell"><span class="n" style="color: #333;">newWantedEq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CtReportAs</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Role</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span></span>
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<pre style="margin: 0;">+<span id="LC3505" class="line" lang="haskell"><span class="n" style="color: #333;">newWantedEq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">RewriterSet</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Role</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span></span>
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<pre style="margin: 0;"> <span id="LC3506" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC3507" class="line" lang="haskell"><span class="n" style="color: #333;">newWantedEq</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">port_a</span>s</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;">-<span id="LC3508" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">newWantedEq_SI</span> <span class="kt" style="color: #458; font-weight: 600;">YesBlockSubst</span> <span class="kt" style="color: #458; font-weight: 600;">WDeriv</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">port_a</span>s</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;">+<span id="LC3507" class="line" lang="haskell"><span class="n" style="color: #333;">newWantedEq</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">writer</span>s</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;">+<span id="LC3508" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">newWantedEq_SI</span> <span class="kt" style="color: #458; font-weight: 600;">YesBlockSubst</span> <span class="kt" style="color: #458; font-weight: 600;">WDeriv</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">writer</span>s</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;"> <span id="LC3509" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC3510" class="line" lang="haskell"><span class="n" style="color: #333;">newWantedEq_SI</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">BlockSubstFlag</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ShadowInfo</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CtReportAs</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Role</span></span>
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<pre style="margin: 0;">+<span id="LC3510" class="line" lang="haskell"><span class="n" style="color: #333;">newWantedEq_SI</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">BlockSubstFlag</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ShadowInfo</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">RewriterSet</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Role</span></span>
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<pre style="margin: 0;"> <span id="LC3511" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span></span>
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<pre style="margin: 0;"> <span id="LC3512" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC3513" class="line" lang="haskell"><span class="n" style="color: #333;">newWantedEq_SI</span> <span class="n" style="color: #333;">blocker</span> <span class="n" style="color: #333;">si</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">port_a</span>s</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;">+<span id="LC3513" class="line" lang="haskell"><span class="n" style="color: #333;">newWantedEq_SI</span> <span class="n" style="color: #333;">blocker</span> <span class="n" style="color: #333;">si</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">writer</span>s</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span></span>
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3514
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<pre style="margin: 0;"> <span id="LC3514" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">hole</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">wrapTcS</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">newCoercionHole</span> <span class="n" style="color: #333;">blocker</span> <span class="n" style="color: #333;">pty</span></span>
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3515
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<pre style="margin: 0;"> <span id="LC3515" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"Emitting new coercion hole"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">hole</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">pty</span><span class="p">)</span></span>
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3516
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3516
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<pre style="margin: 0;"> <span id="LC3516" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <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;">pty</span></span>
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3517
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<pre style="margin: 0;"> <span id="LC3517" class="line" lang="haskell"> <span class="p">,</span> <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;">HoleDest</span> <span class="n" style="color: #333;">hole</span></span>
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3518
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3518
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<pre style="margin: 0;"> <span id="LC3518" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_nosh</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">si</span></span>
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3519
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3519
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<pre style="margin: 0;"> <span id="LC3519" 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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3520
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<pre style="margin: 0;">-<span id="LC3520" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_re<span class="idiff left">port_as</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 right">report_a</span>s</span> <span class="p">}</span></span>
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3520
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<pre style="margin: 0;">+<span id="LC3520" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_re<span class="idiff left">writers</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 right">rewriter</span>s</span> <span class="p">}</span></span>
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3521
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3521
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<pre style="margin: 0;"> <span id="LC3521" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">mkHoleCo</span> <span class="n" style="color: #333;">hole</span> <span class="p">)</span> <span class="p">}</span></span>
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3522
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3522
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<pre style="margin: 0;"> <span id="LC3522" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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3523
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3523
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<pre style="margin: 0;"> <span id="LC3523" class="line" lang="haskell"> <span class="n" style="color: #333;">pty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkPrimEqPredRole</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span></span>
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3524
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3524
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<pre style="margin: 0;"> <span id="LC3524" class="line" lang="haskell"></span>
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3525
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3525
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<pre style="margin: 0;"> <span id="LC3525" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- no equalities here. Use newWantedEq instead</span></span>
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3526
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<pre style="margin: 0;">-<span id="LC3526" class="line" lang="haskell"><span class="n" style="color: #333;">newWantedEvVarNC</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CtReportAs</span></span></span>
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3526
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<pre style="margin: 0;">+<span id="LC3526" class="line" lang="haskell"><span class="n" style="color: #333;">newWantedEvVarNC</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">RewriterSet</span></span></span>
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3527
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<pre style="margin: 0;"> <span id="LC3527" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcPredType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span></span>
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3528
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3528
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<pre style="margin: 0;"> <span id="LC3528" class="line" lang="haskell"><span class="n" style="color: #333;">newWantedEvVarNC</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">newWantedEvVarNC_SI</span> <span class="kt" style="color: #458; font-weight: 600;">WDeriv</span></span>
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3529
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3529
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<pre style="margin: 0;"> <span id="LC3529" class="line" lang="haskell"></span>
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3530
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<pre style="margin: 0;">-<span id="LC3530" class="line" lang="haskell"><span class="n" style="color: #333;">newWantedEvVarNC_SI</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ShadowInfo</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CtReportAs</span></span></span>
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3530
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<pre style="margin: 0;">+<span id="LC3530" class="line" lang="haskell"><span class="n" style="color: #333;">newWantedEvVarNC_SI</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ShadowInfo</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">RewriterSet</span></span></span>
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3531
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3531
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<pre style="margin: 0;"> <span id="LC3531" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcPredType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span></span>
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3532
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3532
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<pre style="margin: 0;"> <span id="LC3532" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Don't look up in the solved/inerts; we know it's not there</span></span>
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3533
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<pre style="margin: 0;">-<span id="LC3533" class="line" lang="haskell"><span class="n" style="color: #333;">newWantedEvVarNC_SI</span> <span class="n" style="color: #333;">si</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">port_a</span>s</span> <span class="n" style="color: #333;">pty</span></span>
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3533
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<pre style="margin: 0;">+<span id="LC3533" class="line" lang="haskell"><span class="n" style="color: #333;">newWantedEvVarNC_SI</span> <span class="n" style="color: #333;">si</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">writer</span>s</span> <span class="n" style="color: #333;">pty</span></span>
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3534
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<pre style="margin: 0;"> <span id="LC3534" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">new_ev</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newEvVar</span> <span class="n" style="color: #333;">pty</span></span>
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<pre style="margin: 0;"> <span id="LC3535" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"Emitting new wanted"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">new_ev</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">pty</span> <span class="o" style="font-weight: 600;">$$</span></span>
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<pre style="margin: 0;"> <span id="LC3536" class="line" lang="haskell"> <span class="n" style="color: #333;">pprCtLoc</span> <span class="n" style="color: #333;">loc</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">@@ -3538,48 +3538,48 @@ newWantedEvVarNC_SI si loc report_as pty</td>
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<pre style="margin: 0;"> <span id="LC3538" class="line" lang="haskell"> <span class="p">,</span> <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;">new_ev</span></span>
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<pre style="margin: 0;"> <span id="LC3539" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_nosh</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">si</span></span>
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<pre style="margin: 0;"> <span id="LC3540" 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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<pre style="margin: 0;">-<span id="LC3541" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_re<span class="idiff left">port_as</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 right">report_a</span>s</span> <span class="p">})}</span></span>
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<pre style="margin: 0;">+<span id="LC3541" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_re<span class="idiff left">writers</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 right">rewriter</span>s</span> <span class="p">})}</span></span>
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<pre style="margin: 0;"> <span id="LC3542" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC3543" class="line" lang="haskell"><span class="n" style="color: #333;">newWantedEvVar_SI</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ShadowInfo</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CtReportAs</span></span></span>
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<pre style="margin: 0;">+<span id="LC3543" class="line" lang="haskell"><span class="n" style="color: #333;">newWantedEvVar_SI</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ShadowInfo</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">RewriterSet</span></span></span>
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<pre style="margin: 0;"> <span id="LC3544" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcPredType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeNew</span></span>
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<pre style="margin: 0;"> <span id="LC3545" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- For anything except ClassPred, this is the same as newWantedEvVarNC</span></span>
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<pre style="margin: 0;">-<span id="LC3546" class="line" lang="haskell"><span class="n" style="color: #333;">newWantedEvVar_SI</span> <span class="n" style="color: #333;">si</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">port_a</span>s</span> <span class="n" style="color: #333;">pty</span></span>
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<pre style="margin: 0;">+<span id="LC3546" class="line" lang="haskell"><span class="n" style="color: #333;">newWantedEvVar_SI</span> <span class="n" style="color: #333;">si</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">writer</span>s</span> <span class="n" style="color: #333;">pty</span></span>
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<pre style="margin: 0;"> <span id="LC3547" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">mb_ct</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupInInerts</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">pty</span></span>
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<pre style="margin: 0;"> <span id="LC3548" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">mb_ct</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;"> <span id="LC3549" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">ctev</span></span>
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<pre style="margin: 0;"> <span id="LC3550" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isDerived</span> <span class="n" style="color: #333;">ctev</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC3551" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"newWantedEvVar/cache hit"</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ctev</span></span>
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<pre style="margin: 0;"> <span id="LC3552" class="line" lang="haskell"> <span class="p">;</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;">Cached</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvExpr</span> <span class="n" style="color: #333;">ctev</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC3553" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newWantedEvVarNC_SI</span> <span class="n" style="color: #333;">si</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">port_a</span>s</span> <span class="n" style="color: #333;">pty</span></span>
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3553
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<pre style="margin: 0;">+<span id="LC3553" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newWantedEvVarNC_SI</span> <span class="n" style="color: #333;">si</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">writer</span>s</span> <span class="n" style="color: #333;">pty</span></span>
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3554
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3554
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<pre style="margin: 0;"> <span id="LC3554" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Fresh</span> <span class="n" style="color: #333;">ctev</span><span class="p">)</span> <span class="p">}</span> <span class="p">}</span></span>
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3555
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3555
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<pre style="margin: 0;"> <span id="LC3555" class="line" lang="haskell"></span>
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3556
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<pre style="margin: 0;">-<span id="LC3556" class="line" lang="haskell"><span class="n" style="color: #333;">newWanted</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CtReportAs</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PredType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeNew</span></span>
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<pre style="margin: 0;">+<span id="LC3556" class="line" lang="haskell"><span class="n" style="color: #333;">newWanted</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">RewriterSet</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PredType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeNew</span></span>
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3557
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<pre style="margin: 0;"> <span id="LC3557" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Deals with both equalities and non equalities. Tries to look</span></span>
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3558
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<pre style="margin: 0;"> <span id="LC3558" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- up non-equalities in the cache</span></span>
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3559
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<pre style="margin: 0;"> <span id="LC3559" class="line" lang="haskell"><span class="n" style="color: #333;">newWanted</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">newWanted_SI</span> <span class="kt" style="color: #458; font-weight: 600;">WDeriv</span></span>
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3560
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3560
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<pre style="margin: 0;"> <span id="LC3560" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC3561" class="line" lang="haskell"><span class="n" style="color: #333;">newWanted_SI</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ShadowInfo</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CtReportAs</span></span></span>
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<pre style="margin: 0;">+<span id="LC3561" class="line" lang="haskell"><span class="n" style="color: #333;">newWanted_SI</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ShadowInfo</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">RewriterSet</span></span></span>
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<pre style="margin: 0;"> <span id="LC3562" class="line" lang="haskell"> <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;">TcS</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeNew</span></span>
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<pre style="margin: 0;">-<span id="LC3563" class="line" lang="haskell"><span class="n" style="color: #333;">newWanted_SI</span> <span class="n" style="color: #333;">si</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">port_a</span>s</span> <span class="n" style="color: #333;">pty</span></span>
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<pre style="margin: 0;">+<span id="LC3563" class="line" lang="haskell"><span class="n" style="color: #333;">newWanted_SI</span> <span class="n" style="color: #333;">si</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">writer</span>s</span> <span class="n" style="color: #333;">pty</span></span>
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3564
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<pre style="margin: 0;"> <span id="LC3564" 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;">role</span><span class="p">,</span> <span class="n" style="color: #333;">ty1</span><span class="p">,</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getEqPredTys_maybe</span> <span class="n" style="color: #333;">pty</span></span>
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3565
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<pre style="margin: 0;">-<span id="LC3565" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Fresh</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">fst</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">newWantedEq_SI</span> <span class="kt" style="color: #458; font-weight: 600;">YesBlockSubst</span> <span class="n" style="color: #333;">si</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">port_a</span>s</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;">+<span id="LC3565" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Fresh</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">fst</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">newWantedEq_SI</span> <span class="kt" style="color: #458; font-weight: 600;">YesBlockSubst</span> <span class="n" style="color: #333;">si</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">writer</span>s</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span></span>
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3566
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<pre style="margin: 0;"> <span id="LC3566" 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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3567
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<pre style="margin: 0;">-<span id="LC3567" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">newWantedEvVar_SI</span> <span class="n" style="color: #333;">si</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">port_a</span>s</span> <span class="n" style="color: #333;">pty</span></span>
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3567
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<pre style="margin: 0;">+<span id="LC3567" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">newWantedEvVar_SI</span> <span class="n" style="color: #333;">si</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">re<span class="idiff left right">writer</span>s</span> <span class="n" style="color: #333;">pty</span></span>
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3568
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3568
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<pre style="margin: 0;"> <span id="LC3568" class="line" lang="haskell"></span>
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3569
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3569
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<pre style="margin: 0;"> <span id="LC3569" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- deals with both equalities and non equalities. Doesn't do any cache lookups.</span></span>
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3570
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<pre style="margin: 0;">-<span id="LC3570" class="line" lang="haskell"><span class="n" style="color: #333;">newWantedNC</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PredType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span></span>
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3571
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<pre style="margin: 0;">-<span id="LC3571" class="line" lang="haskell"><span class="n" style="color: #333;">newWantedNC</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">pty</span></span>
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<pre style="margin: 0;">+<span id="LC3570" class="line" lang="haskell"><span class="n" style="color: #333;">newWantedNC</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">RewriterSet</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff right"> </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;">TcS</span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span></span>
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3571
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<pre style="margin: 0;">+<span id="LC3571" class="line" lang="haskell"><span class="n" style="color: #333;">newWantedNC</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;"><span class="idiff left">rewriters</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">pty</span></span>
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3572
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<pre style="margin: 0;"> <span id="LC3572" 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;">role</span><span class="p">,</span> <span class="n" style="color: #333;">ty1</span><span class="p">,</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getEqPredTys_maybe</span> <span class="n" style="color: #333;">pty</span></span>
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3573
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<pre style="margin: 0;">-<span id="LC3573" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fst</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">newWantedEq</span> <span class="n" style="color: #333;">loc</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CtReportAsSame</span></span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;">+<span id="LC3573" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fst</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">newWantedEq</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;"><span class="idiff left right">rewriters</span></span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span></span>
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3574
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<pre style="margin: 0;"> <span id="LC3574" 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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3575
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<pre style="margin: 0;">-<span id="LC3575" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">newWantedEvVarNC</span> <span class="n" style="color: #333;">loc</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">CtReportAsSame</span></span> <span class="n" style="color: #333;">pty</span></span>
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<pre style="margin: 0;">+<span id="LC3575" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">newWantedEvVarNC</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;"><span class="idiff left right">rewriters</span></span> <span class="n" style="color: #333;">pty</span></span>
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<pre style="margin: 0;"> <span id="LC3576" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3577" class="line" lang="haskell"><span class="n" style="color: #333;">emitNewDeriveds</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcPredType</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC3578" class="line" lang="haskell"><span class="n" style="color: #333;">emitNewDeriveds</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">preds</span></span>
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3579
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<pre style="margin: 0;"> <span id="LC3579" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">preds</span></span>
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<pre style="margin: 0;"> <span id="LC3580" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC3581" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<pre style="margin: 0;">-<span id="LC3582" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">evs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">newDerivedNC</span> <span class="n" style="color: #333;">loc</span><span class="p">)</span> <span class="n" style="color: #333;">preds</span></span>
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<pre style="margin: 0;">+<span id="LC3582" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">evs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">newDerivedNC</span> <span class="n" style="color: #333;">loc</span><span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff right">emptyRewriterSet</span></span><span class="p">)</span> <span class="n" style="color: #333;">preds</span></span>
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<pre style="margin: 0;"> <span id="LC3583" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"Emitting new deriveds"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">evs</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC3584" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">updWorkListTcS</span> <span class="p">(</span><span class="n" style="color: #333;">extendWorkListDeriveds</span> <span class="n" style="color: #333;">evs</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC3585" 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">@@ -3587,13 +3587,13 @@ emitNewDerivedEq :: CtLoc -> Role -> TcType -> TcType -> TcS ()</td>
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<pre style="margin: 0;"> <span id="LC3587" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Create new equality Derived and put it in the work list</span></span>
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<pre style="margin: 0;"> <span id="LC3588" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- There's no caching, no lookupInInerts</span></span>
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<pre style="margin: 0;"> <span id="LC3589" class="line" lang="haskell"><span class="n" style="color: #333;">emitNewDerivedEq</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;">-<span id="LC3590" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">ev</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newDerivedNC</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="n" style="color: #333;">mkPrimEqPredRole</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC3590" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">ev</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newDerivedNC</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;"><span class="idiff left">emptyRewriterSet</span></span><span class="idiff right"> </span><span class="p">(</span><span class="n" style="color: #333;">mkPrimEqPredRole</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC3591" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTcS</span> <span class="s" style="color: #d14;">"Emitting new derived equality"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ev</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">pprCtLoc</span> <span class="n" style="color: #333;">loc</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC3592" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">updWorkListTcS</span> <span class="p">(</span><span class="n" style="color: #333;">extendWorkListEq</span> <span class="p">(</span><span class="n" style="color: #333;">mkNonCanonical</span> <span class="n" style="color: #333;">ev</span><span class="p">))</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC3593" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Very important: put in the wl_eqs</span></span>
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<pre style="margin: 0;"> <span id="LC3594" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Prioritise equalities] (Avoiding fundep iteration)</span></span>
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<pre style="margin: 0;"> <span id="LC3595" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC3596" class="line" lang="haskell"><span class="n" style="color: #333;">newDerivedNC</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcPredType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span></span>
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<pre style="margin: 0;">+<span id="LC3596" class="line" lang="haskell"><span class="n" style="color: #333;">newDerivedNC</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtLoc</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">RewriterSet</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff right"> </span><span class="kt" style="color: #458; font-weight: 600;">TcPredType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcS</span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span></span>
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<pre style="margin: 0;"> <span id="LC3597" class="line" lang="haskell"><span class="n" style="color: #333;">newDerivedNC</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">newWantedNC</span> <span class="cm" style="color: #998; font-style: italic;">{- "RAE"</span></span>
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<pre style="margin: 0;"> <span id="LC3598" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> = do { -- checkReductionDepth loc pred</span></span>
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<pre style="margin: 0;"> <span id="LC3599" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ; return (CtDerived { ctev_pred = pred, ctev_loc = loc }) } -}</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/f5433f0bc06f65deb96a44b62d47875ec4bc5b38...5d3804aec65f0801363c28ca3bb8a15f4ef3e6db#3b6d78a50c8462304f843b952a88e531718dbbd2"><strong>compiler/GHC/Tc/Types/Constraint.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 CPP, GeneralizedNewtypeDeriving #-}</span></span>
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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 CPP, GeneralizedNewtypeDeriving<span class="idiff left right">, DerivingStrategies, TypeApplications</span> #-}</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="cp" style="color: #999; font-weight: 600;">{-# OPTIONS_GHC -Wno-incomplete-record-updates #-}</span></span>
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<pre style="margin: 0;"> <span id="LC4" 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">@@ -17,12 +17,13 @@ module GHC.Tc.Types.Constraint (</td>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isCNonCanonical</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isWantedCt</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isDerivedCt</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isGivenCt</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isUserTypeError</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">getUserTypeErrorMsg</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">ctEvidence</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">ctLoc</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">setCtLoc</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">ctPred</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">ctFlavour</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">ctEqRel</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">ctOrigin</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">ctRewriters</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">ctEvId</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkTcEqPredLikeEv</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkNonCanonical</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkNonCanonicalCt</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkGivens</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">mkIrredCt</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">ctEvPred</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">ctEvLoc</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">ctEvOrigin</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">ctEvEqRel</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">ctEvExpr</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">ctEvTerm</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">ctEvCoercion</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">ctEvEvId</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC25" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">ct<span class="idiff left">ReportAs</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">ctUnique</span></span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">ct<span class="idiff left right">EvRewriters</span></span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tyCoVarsOfCt</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tyCoVarsOfCts</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tyCoVarsOfCtList</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tyCoVarsOfCtsList</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC29" 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">@@ -51,10 +52,11 @@ module GHC.Tc.Types.Constraint (</td>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isWanted</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isGiven</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isDerived</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isGivenOrWDeriv</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">ctEvRole</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">setCtEvLoc</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">arisesFromGivens</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tyCoVarsOfCtEvList</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tyCoVarsOfCtEv</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tyCoVarsOfCtEvsList</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC54" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">ctEv<span class="idiff left">ReportAs</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">ctEv</span>Unique</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcEvDestUnique</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC55" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">ctEvUnique</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcEvDestUnique</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC56" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CtReportAs</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">ctPredToReport</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">substCtReportAs</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC57" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">updateReportAs</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">WRWFlag</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">wantedRewriteWanted</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC57" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">RewriterSet</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">emptyRewriterSet</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isEmptyRewriterSet</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC58" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- exported concretely only for anyUnfilledCoercionHoles</span></span>
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<pre style="margin: 0;">+<span id="LC59" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">wantedRewriteWanted</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">rewriterSetFromCo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">addRewriterSet</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC60" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC61" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">wrapType</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC62" 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">@@ -98,13 +100,16 @@ import GHC.Types.Var.Set</td>
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<pre style="margin: 0;"> <span id="LC100" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Driver.Session</span></span>
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<pre style="margin: 0;"> <span id="LC101" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Basic</span></span>
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<pre style="margin: 0;"> <span id="LC102" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Unique</span></span>
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<pre style="margin: 0;">+<span id="LC103" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Unique.Set</span></span>
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<pre style="margin: 0;"> <span id="LC104" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC105" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Outputable</span></span>
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<pre style="margin: 0;"> <span id="LC106" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.SrcLoc</span></span>
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<pre style="margin: 0;"> <span id="LC107" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.Bag</span></span>
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<pre style="margin: 0;"> <span id="LC108" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Misc</span></span>
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109
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<pre style="margin: 0;"> <span id="LC109" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC107" 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;">Data.Semigroup</span></span>
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<pre style="margin: 0;">+<span id="LC110" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Coerce</span></span>
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<pre style="margin: 0;">+<span id="LC111" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Monoid</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Endo</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC112" 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;">Data.Semigroup</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">S</span></span>
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<pre style="margin: 0;"> <span id="LC113" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Monad</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">msum</span> <span class="p">)</span></span>
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114
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<pre style="margin: 0;"> <span id="LC114" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC115" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</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">@@ -439,6 +444,9 @@ ctPred :: Ct -> PredType</td>
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<pre style="margin: 0;"> <span id="LC444" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Ct/evidence invariant]</span></span>
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<pre style="margin: 0;"> <span id="LC445" class="line" lang="haskell"><span class="n" style="color: #333;">ctPred</span> <span class="n" style="color: #333;">ct</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctEvPred</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvidence</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC446" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC447" class="line" lang="haskell"><span class="n" style="color: #333;">ctRewriters</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;">RewriterSet</span></span>
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<pre style="margin: 0;">+<span id="LC448" class="line" lang="haskell"><span class="n" style="color: #333;">ctRewriters</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctEvRewriters</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">ctEvidence</span></span>
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<pre style="margin: 0;">+<span id="LC449" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC450" class="line" lang="haskell"><span class="n" style="color: #333;">ctEvId</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;">EvVar</span></span>
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<pre style="margin: 0;"> <span id="LC451" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The evidence Id for this Ct</span></span>
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<pre style="margin: 0;"> <span id="LC452" class="line" lang="haskell"><span class="n" style="color: #333;">ctEvId</span> <span class="n" style="color: #333;">ct</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctEvEvId</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvidence</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="469" 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">@@ -461,17 +469,6 @@ ctFlavour = ctEvFlavour . ctEvidence</td>
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<pre style="margin: 0;"> <span id="LC469" class="line" lang="haskell"><span class="n" style="color: #333;">ctEqRel</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;">EqRel</span></span>
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<pre style="margin: 0;"> <span id="LC470" class="line" lang="haskell"><span class="n" style="color: #333;">ctEqRel</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctEvEqRel</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">ctEvidence</span></span>
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<pre style="margin: 0;"> <span id="LC471" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC464" class="line" lang="haskell"><span class="cd">-- | Extract a 'CtReportAs' from a 'Ct'. Works only for Wanteds;</span></span>
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<pre style="margin: 0;">-<span id="LC465" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- will panic on other arguments</span></span>
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<pre style="margin: 0;">-<span id="LC466" class="line" lang="haskell"><span class="n" style="color: #333;">ctReportAs</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;">CtReportAs</span></span>
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<pre style="margin: 0;">-<span id="LC467" class="line" lang="haskell"><span class="n" style="color: #333;">ctReportAs</span> <span class="n" style="color: #333;">ct</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">ctEvidence</span> <span class="n" style="color: #333;">ct</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC468" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_report_as</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">report_as</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">report_as</span></span>
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<pre style="margin: 0;">-<span id="LC469" 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;">pprPanic</span> <span class="s" style="color: #d14;">"ctReportAs"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC470" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC471" class="line" lang="haskell"><span class="cd">-- | Extract a Unique from a 'Ct'</span></span>
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<pre style="margin: 0;">-<span id="LC472" class="line" lang="haskell"><span class="n" style="color: #333;">ctUnique</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;">Unique</span></span>
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<pre style="margin: 0;">-<span id="LC473" class="line" lang="haskell"><span class="n" style="color: #333;">ctUnique</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctEvUnique</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">ctEvidence</span></span>
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<pre style="margin: 0;">-<span id="LC474" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC472" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">Ct</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC473" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ct</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvidence</span> <span class="n" style="color: #333;">ct</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">parens</span> <span class="n" style="color: #333;">pp_sort</span></span>
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<pre style="margin: 0;"> <span id="LC474" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</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">@@ -932,13 +929,8 @@ pprCts cts = vcat (map ppr (bagToList cts))</td>
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<pre style="margin: 0;"> <span id="LC929" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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<pre style="margin: 0;"> <span id="LC930" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<pre style="margin: 0;"> <span id="LC931" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Wanted constraints</span></span>
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<pre style="margin: 0;">-<span id="LC935" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> These are forced to be in GHC.Tc.Types because</span></span>
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936
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<pre style="margin: 0;">-<span id="LC936" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> TcLclEnv mentions WantedConstraints</span></span>
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937
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<pre style="margin: 0;">-<span id="LC937" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> WantedConstraint mentions CtLoc</span></span>
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<pre style="margin: 0;">-<span id="LC938" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> CtLoc mentions ErrCtxt</span></span>
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939
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<pre style="margin: 0;">-<span id="LC939" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ErrCtxt mentions TcM</span></span>
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940
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932
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<pre style="margin: 0;"> <span id="LC932" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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941
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<pre style="margin: 0;">-<span id="LC941" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">v%</span>************************************************************************</span></span>
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933
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<pre style="margin: 0;">+<span id="LC933" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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942
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934
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<pre style="margin: 0;"> <span id="LC934" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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943
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935
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<pre style="margin: 0;"> <span id="LC935" class="line" lang="haskell"></span>
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936
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<pre style="margin: 0;"> <span id="LC936" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</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">@@ -1413,24 +1405,6 @@ data TcEvDest</td>
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<pre style="margin: 0;"> <span id="LC1405" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- HoleDest is always used for type-equalities</span></span>
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<pre style="margin: 0;"> <span id="LC1406" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Coercion holes] in GHC.Core.TyCo.Rep</span></span>
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<pre style="margin: 0;"> <span id="LC1407" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1416" class="line" lang="haskell"><span class="cd">-- | What should we report to the user when reporting this Wanted?</span></span>
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<pre style="margin: 0;">-<span id="LC1417" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Wanteds rewrite Wanteds]</span></span>
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<pre style="margin: 0;">-<span id="LC1418" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAs</span></span>
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<pre style="margin: 0;">-<span id="LC1419" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAsSame</span> <span class="c1" style="color: #998; font-style: italic;">-- just report the predicate in the Ct</span></span>
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<pre style="margin: 0;">-<span id="LC1420" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAsOther</span> <span class="kt" style="color: #458; font-weight: 600;">Unique</span> <span class="kt" style="color: #458; font-weight: 600;">TcPredType</span> <span class="c1" style="color: #998; font-style: italic;">-- report this other type</span></span>
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<pre style="margin: 0;">-<span id="LC1421" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See GHC.Tc.Errors Note [Avoid reporting duplicates] about the Unique</span></span>
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<pre style="margin: 0;">-<span id="LC1422" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1423" class="line" lang="haskell"><span class="cd">-- | Did a wanted rewrite a wanted?</span></span>
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<pre style="margin: 0;">-<span id="LC1424" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Wanteds rewrite Wanteds]</span></span>
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<pre style="margin: 0;">-<span id="LC1425" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">WRWFlag</span></span>
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<pre style="margin: 0;">-<span id="LC1426" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">YesWRW</span></span>
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<pre style="margin: 0;">-<span id="LC1427" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">NoWRW</span></span>
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<pre style="margin: 0;">-<span id="LC1428" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span></span>
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1429
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<pre style="margin: 0;">-<span id="LC1429" class="line" lang="haskell"></span>
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1430
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<pre style="margin: 0;">-<span id="LC1430" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Semigroup</span> <span class="kt" style="color: #458; font-weight: 600;">WRWFlag</span> <span class="kr" style="font-weight: 600;">where</span></span>
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1431
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<pre style="margin: 0;">-<span id="LC1431" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NoWRW</span> <span class="o" style="font-weight: 600;"><></span> <span class="kt" style="color: #458; font-weight: 600;">NoWRW</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NoWRW</span></span>
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1432
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<pre style="margin: 0;">-<span id="LC1432" class="line" lang="haskell"> <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="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">YesWRW</span></span>
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1433
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<pre style="margin: 0;">-<span id="LC1433" class="line" lang="haskell"></span>
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1434
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1408
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<pre style="margin: 0;"> <span id="LC1408" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span></span>
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1435
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1409
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<pre style="margin: 0;"> <span id="LC1409" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CtGiven</span> <span class="c1" style="color: #998; font-style: italic;">-- Truly given, not depending on subgoals</span></span>
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1436
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1410
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<pre style="margin: 0;"> <span id="LC1410" 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="kt" style="color: #458; font-weight: 600;">TcPredType</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Ct/evidence invariant]</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1443" 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="1417" 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">@@ -1443,7 +1417,7 @@ data CtEvidence</td>
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1443
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1417
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<pre style="margin: 0;"> <span id="LC1417" class="line" lang="haskell"> <span class="p">,</span> <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;">TcEvDest</span></span>
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1444
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1418
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<pre style="margin: 0;"> <span id="LC1418" class="line" lang="haskell"> <span class="p">,</span> <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;">ShadowInfo</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Constraint flavours]</span></span>
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1445
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1419
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<pre style="margin: 0;"> <span id="LC1419" 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="kt" style="color: #458; font-weight: 600;">CtLoc</span></span>
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1446
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<pre style="margin: 0;">-<span id="LC1446" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_re<span class="idiff left">port_as</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">CtReportAs</span></span> <span class="p">}</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Wanteds rewrite Wanteds]</span></span>
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1420
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<pre style="margin: 0;">+<span id="LC1420" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_re<span class="idiff left">writers</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">::</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">RewriterSet</span></span> <span class="p">}</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Wanteds rewrite Wanteds]</span></span>
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1447
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1421
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<pre style="margin: 0;"> <span id="LC1421" class="line" lang="haskell"></span>
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1448
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1422
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<pre style="margin: 0;"> <span id="LC1422" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">CtDerived</span> <span class="c1" style="color: #998; font-style: italic;">-- A goal that we don't really have to solve and can't</span></span>
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1449
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1423
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<pre style="margin: 0;"> <span id="LC1423" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- immediately rewrite anything other than a derived</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">@@ -1473,6 +1447,14 @@ ctEvRole = eqRelRole . ctEvEqRel</td>
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<pre style="margin: 0;"> <span id="LC1447" class="line" lang="haskell"><span class="n" style="color: #333;">ctEvTerm</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">EvTerm</span></span>
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1474
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<pre style="margin: 0;"> <span id="LC1448" class="line" lang="haskell"><span class="n" style="color: #333;">ctEvTerm</span> <span class="n" style="color: #333;">ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">EvExpr</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvExpr</span> <span class="n" style="color: #333;">ev</span><span class="p">)</span></span>
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1449
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<pre style="margin: 0;"> <span id="LC1449" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1450" class="line" lang="haskell"><span class="cd">-- | Extract the set of rewriters from a 'CtEvidence'</span></span>
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<pre style="margin: 0;">+<span id="LC1451" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Wanteds rewrite Wanteds]</span></span>
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<pre style="margin: 0;">+<span id="LC1452" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If the provided CtEvidence is not for a Wanted, just</span></span>
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<pre style="margin: 0;">+<span id="LC1453" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- return an empty set.</span></span>
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<pre style="margin: 0;">+<span id="LC1454" class="line" lang="haskell"><span class="n" style="color: #333;">ctEvRewriters</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RewriterSet</span></span>
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<pre style="margin: 0;">+<span id="LC1455" class="line" lang="haskell"><span class="n" style="color: #333;">ctEvRewriters</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_rewriters</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rewriters</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rewriters</span></span>
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<pre style="margin: 0;">+<span id="LC1456" class="line" lang="haskell"><span class="n" style="color: #333;">ctEvRewriters</span> <span class="n" style="color: #333;">_other</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">emptyRewriterSet</span></span>
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<pre style="margin: 0;">+<span id="LC1457" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1458" class="line" lang="haskell"><span class="n" style="color: #333;">ctEvExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">EvExpr</span></span>
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<pre style="margin: 0;"> <span id="LC1459" class="line" lang="haskell"><span class="n" style="color: #333;">ctEvExpr</span> <span class="n" style="color: #333;">ev</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <span class="p">{</span> <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;">HoleDest</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC1460" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">ctEvCoercion</span> <span class="n" style="color: #333;">ev</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">@@ -1512,48 +1494,14 @@ arisesFromGivens Given _ = True</td>
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<pre style="margin: 0;"> <span id="LC1494" class="line" lang="haskell"><span class="n" style="color: #333;">arisesFromGivens</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Wanted</span> <span class="p">{})</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isGivenLoc</span> <span class="n" style="color: #333;">loc</span> <span class="c1" style="color: #998; font-style: italic;">-- could be a Given FunDep</span></span>
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<pre style="margin: 0;"> <span id="LC1495" class="line" lang="haskell"><span class="n" style="color: #333;">arisesFromGivens</span> <span class="kt" style="color: #458; font-weight: 600;">Derived</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isGivenLoc</span> <span class="n" style="color: #333;">loc</span></span>
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<pre style="margin: 0;"> <span id="LC1496" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1515" class="line" lang="haskell"><span class="cd">-- | Return a 'CtReportAs' from a 'CtEvidence'. Returns</span></span>
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<pre style="margin: 0;">-<span id="LC1516" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'CtReportAsSame' for non-wanteds.</span></span>
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<pre style="margin: 0;">-<span id="LC1517" class="line" lang="haskell"><span class="n" style="color: #333;">ctEvReportAs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAs</span></span>
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<pre style="margin: 0;">-<span id="LC1518" class="line" lang="haskell"><span class="n" style="color: #333;">ctEvReportAs</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <span class="p">{</span> <span class="n" style="color: #333;">ctev_report_as</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">report_as</span> <span class="p">})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">report_as</span></span>
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<pre style="margin: 0;">-<span id="LC1519" class="line" lang="haskell"><span class="n" style="color: #333;">ctEvReportAs</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAsSame</span></span>
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<pre style="margin: 0;">-<span id="LC1520" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1521" class="line" lang="haskell"><span class="cd">-- | Given the pred in a CtWanted and its 'CtReportAs', get</span></span>
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<pre style="margin: 0;">-<span id="LC1522" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the pred to report. See Note [Wanteds rewrite Wanteds]</span></span>
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<pre style="margin: 0;">-<span id="LC1523" class="line" lang="haskell"><span class="n" style="color: #333;">ctPredToReport</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcEvDest</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcPredType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAs</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Unique</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcPredType</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1524" class="line" lang="haskell"><span class="n" style="color: #333;">ctPredToReport</span> <span class="n" style="color: #333;">dest</span> <span class="n" style="color: #333;">pred</span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAsSame</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">tcEvDestUnique</span> <span class="n" style="color: #333;">dest</span><span class="p">,</span> <span class="n" style="color: #333;">pred</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1525" class="line" lang="haskell"><span class="n" style="color: #333;">ctPredToReport</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CtReportAsOther</span> <span class="n" style="color: #333;">u</span> <span class="n" style="color: #333;">pred</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">u</span><span class="p">,</span> <span class="n" style="color: #333;">pred</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1526" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1527" class="line" lang="haskell"><span class="cd">-- | Substitute in a 'CtReportAs'</span></span>
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<pre style="margin: 0;">-<span id="LC1528" class="line" lang="haskell"><span class="n" style="color: #333;">substCtReportAs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAs</span></span>
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<pre style="margin: 0;">-<span id="LC1529" class="line" lang="haskell"><span class="n" style="color: #333;">substCtReportAs</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAsSame</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAsSame</span></span>
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1530
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<pre style="margin: 0;">-<span id="LC1530" class="line" lang="haskell"><span class="n" style="color: #333;">substCtReportAs</span> <span class="n" style="color: #333;">subst</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CtReportAsOther</span> <span class="n" style="color: #333;">u</span> <span class="n" style="color: #333;">pred</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAsOther</span> <span class="n" style="color: #333;">u</span> <span class="p">(</span><span class="n" style="color: #333;">substTy</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">pred</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC1531" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1532" class="line" lang="haskell"><span class="cd">-- | After rewriting a Wanted, update the 'CtReportAs' for the new Wanted.</span></span>
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<pre style="margin: 0;">-<span id="LC1533" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If the old CtReportAs is CtReportAsSame and a wanted rewrote a wanted,</span></span>
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<pre style="margin: 0;">-<span id="LC1534" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- record the old pred as the new CtReportAs.</span></span>
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<pre style="margin: 0;">-<span id="LC1535" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Wanteds rewrite Wanteds]</span></span>
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<pre style="margin: 0;">-<span id="LC1536" class="line" lang="haskell"><span class="n" style="color: #333;">updateReportAs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">WRWFlag</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Unique</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcPredType</span> <span class="c1" style="color: #998; font-style: italic;">-- _old_ pred type</span></span>
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1537
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<pre style="margin: 0;">-<span id="LC1537" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAs</span></span>
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1538
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<pre style="margin: 0;">-<span id="LC1538" class="line" lang="haskell"><span class="n" style="color: #333;">updateReportAs</span> <span class="kt" style="color: #458; font-weight: 600;">YesWRW</span> <span class="n" style="color: #333;">unique</span> <span class="n" style="color: #333;">old_pred</span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAsSame</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAsOther</span> <span class="n" style="color: #333;">unique</span> <span class="n" style="color: #333;">old_pred</span></span>
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1539
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<pre style="margin: 0;">-<span id="LC1539" class="line" lang="haskell"><span class="n" style="color: #333;">updateReportAs</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">report_as</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">report_as</span></span>
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<pre style="margin: 0;">-<span id="LC1540" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1497" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">TcEvDest</span> <span class="kr" style="font-weight: 600;">where</span></span>
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1498
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<pre style="margin: 0;"> <span id="LC1498" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HoleDest</span> <span class="n" style="color: #333;">h</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"hole"</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">h</span></span>
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1543
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1499
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<pre style="margin: 0;"> <span id="LC1499" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EvVarDest</span> <span class="n" style="color: #333;">ev</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ev</span></span>
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1544
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1500
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<pre style="margin: 0;"> <span id="LC1500" class="line" lang="haskell"></span>
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1545
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<pre style="margin: 0;">-<span id="LC1545" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAs</span> <span class="kr" style="font-weight: 600;">where</span></span>
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1546
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<pre style="margin: 0;">-<span id="LC1546" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAsSame</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"CtReportAsSame"</span></span>
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1547
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<td class="diff-line-num new_line old" data-linenumber="1501" 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="LC1547" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CtReportAsOther</span> <span class="n" style="color: #333;">u</span> <span class="n" style="color: #333;">pred</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">parens</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"CtReportAsOther"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">u</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">pred</span></span>
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1548
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<pre style="margin: 0;">-<span id="LC1548" class="line" lang="haskell"></span>
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1549
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<pre style="margin: 0;">-<span id="LC1549" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">WRWFlag</span> <span class="kr" style="font-weight: 600;">where</span></span>
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1550
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<pre style="margin: 0;">-<span id="LC1550" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">NoWRW</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"NoWRW"</span></span>
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1551
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<pre style="margin: 0;">-<span id="LC1551" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">YesWRW</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"YesWRW"</span></span>
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1552
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<pre style="margin: 0;">-<span id="LC1552" class="line" lang="haskell"></span>
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1553
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1501
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<pre style="margin: 0;"> <span id="LC1501" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span> <span class="kr" style="font-weight: 600;">where</span></span>
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1554
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1502
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<pre style="margin: 0;"> <span id="LC1502" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvFlavour</span> <span class="n" style="color: #333;">ev</span><span class="p">)</span></span>
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1555
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1503
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<pre style="margin: 0;"> <span id="LC1503" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pp_ev</span></span>
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1556
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<pre style="margin: 0;">-<span id="LC1556" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">braces</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">ctl_depth</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvLoc</span> <span class="n" style="color: #333;">ev</span><span class="p">)))</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">dcolon</span></span>
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1504
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<pre style="margin: 0;">+<span id="LC1504" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">braces</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">ctl_depth</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvLoc</span> <span class="n" style="color: #333;">ev</span><span class="p">))</span><span class="idiff left"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">pp_rewriters</span></span><span class="p">)</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">dcolon</span></span>
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1557
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1505
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<pre style="margin: 0;"> <span id="LC1505" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Show the sub-goal depth too</span></span>
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1558
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1506
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<pre style="margin: 0;"> <span id="LC1506" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvPred</span> <span class="n" style="color: #333;">ev</span><span class="p">)</span></span>
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1559
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1507
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<pre style="margin: 0;"> <span id="LC1507" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1562" 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>
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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">@@ -1562,6 +1510,10 @@ instance Outputable CtEvidence where</td>
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1562
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1510
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<pre style="margin: 0;"> <span id="LC1510" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <span class="p">{</span><span class="n" style="color: #333;">ctev_dest</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">d</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">d</span></span>
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1563
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<td class="diff-line-num new_line" data-linenumber="1511" 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">
1511
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<pre style="margin: 0;"> <span id="LC1511" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CtDerived</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"_"</span></span>
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1564
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<td class="diff-line-num new_line" data-linenumber="1512" 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">
1512
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<pre style="margin: 0;"> <span id="LC1512" class="line" lang="haskell"></span>
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<td class="diff-line-num new new_line" data-linenumber="1513" 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">
1513
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<pre style="margin: 0;">+<span id="LC1513" class="line" lang="haskell"> <span class="n" style="color: #333;">rewriters</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctEvRewriters</span> <span class="n" style="color: #333;">ev</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1514" 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">
1514
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<pre style="margin: 0;">+<span id="LC1514" class="line" lang="haskell"> <span class="n" style="color: #333;">pp_rewriters</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isEmptyRewriterSet</span> <span class="n" style="color: #333;">rewriters</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">empty</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1515" 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">
1515
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<pre style="margin: 0;">+<span id="LC1515" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">semi</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">rewriters</span></span>
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1516
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<pre style="margin: 0;">+<span id="LC1516" class="line" lang="haskell"></span>
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1565
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1517
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<pre style="margin: 0;"> <span id="LC1517" class="line" lang="haskell"><span class="n" style="color: #333;">isWanted</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</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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1566
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1518
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<pre style="margin: 0;"> <span id="LC1518" class="line" lang="haskell"><span class="n" style="color: #333;">isWanted</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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1567
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1519
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<pre style="margin: 0;"> <span id="LC1519" class="line" lang="haskell"><span class="n" style="color: #333;">isWanted</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1575" 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="1527" 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">@@ -1575,11 +1527,50 @@ isDerived (CtDerived {}) = True</td>
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1575
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1527
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<pre style="margin: 0;"> <span id="LC1527" class="line" lang="haskell"><span class="n" style="color: #333;">isDerived</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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1576
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1528
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<pre style="margin: 0;"> <span id="LC1528" class="line" lang="haskell"></span>
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1577
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1529
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<pre style="margin: 0;"> <span id="LC1529" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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1578
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<pre style="margin: 0;">-<span id="LC1578" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">%************************************************************************</span></span>
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1579
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<pre style="margin: 0;">-<span id="LC1579" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">%* *</span></span>
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1580
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<pre style="margin: 0;">-<span id="LC1580" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> CtFlavour</span></span>
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1581
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<pre style="margin: 0;">-<span id="LC1581" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">%* *</span></span>
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1582
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<pre style="margin: 0;">-<span id="LC1582" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">%************************************************************************</span></span>
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1530
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<pre style="margin: 0;">+<span id="LC1530" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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1531
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<pre style="margin: 0;">+<span id="LC1531" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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1532
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<pre style="margin: 0;">+<span id="LC1532" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> RewriterSet</span></span>
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1533
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<pre style="margin: 0;">+<span id="LC1533" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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1534
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<pre style="margin: 0;">+<span id="LC1534" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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1535
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<pre style="margin: 0;">+<span id="LC1535" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1536
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<pre style="margin: 0;">+<span id="LC1536" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1537" class="line" lang="haskell"><span class="cd">-- | Stores a set of CoercionHoles that have been used to rewrite a constraint.</span></span>
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1538
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<pre style="margin: 0;">+<span id="LC1538" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Wanteds rewrite Wanteds].</span></span>
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1539
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<pre style="margin: 0;">+<span id="LC1539" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">RewriterSet</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">RewriterSet</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UniqSet</span> <span class="kt" style="color: #458; font-weight: 600;">CoercionHole</span><span class="p">)</span></span>
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1540
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<pre style="margin: 0;">+<span id="LC1540" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kr" style="font-weight: 600;">newtype</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Outputable</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Semigroup</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Monoid</span><span class="p">)</span></span>
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1541
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<pre style="margin: 0;">+<span id="LC1541" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1542" class="line" lang="haskell"><span class="n" style="color: #333;">emptyRewriterSet</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">RewriterSet</span></span>
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<pre style="margin: 0;">+<span id="LC1543" class="line" lang="haskell"><span class="n" style="color: #333;">emptyRewriterSet</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">RewriterSet</span> <span class="n" style="color: #333;">emptyUniqSet</span></span>
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1544
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<pre style="margin: 0;">+<span id="LC1544" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1545" class="line" lang="haskell"><span class="n" style="color: #333;">isEmptyRewriterSet</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">RewriterSet</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="LC1546" class="line" lang="haskell"><span class="n" style="color: #333;">isEmptyRewriterSet</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RewriterSet</span> <span class="n" style="color: #333;">set</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isEmptyUniqSet</span> <span class="n" style="color: #333;">set</span></span>
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<pre style="margin: 0;">+<span id="LC1547" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1548" class="line" lang="haskell"><span class="n" style="color: #333;">addRewriterSet</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">RewriterSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CoercionHole</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RewriterSet</span></span>
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<pre style="margin: 0;">+<span id="LC1549" class="line" lang="haskell"><span class="n" style="color: #333;">addRewriterSet</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">coerce</span> <span class="p">(</span><span class="n" style="color: #333;">addOneToUniqSet</span> <span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">CoercionHole</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1550" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1551" class="line" lang="haskell"><span class="cd">-- | Makes a 'RewriterSet' from all the coercion holes that occur in the</span></span>
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<pre style="margin: 0;">+<span id="LC1552" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- given coercion.</span></span>
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<pre style="margin: 0;">+<span id="LC1553" class="line" lang="haskell"><span class="n" style="color: #333;">rewriterSetFromCo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RewriterSet</span></span>
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<pre style="margin: 0;">+<span id="LC1554" class="line" lang="haskell"><span class="n" style="color: #333;">rewriterSetFromCo</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">appEndo</span> <span class="p">(</span><span class="n" style="color: #333;">go_co</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="n" style="color: #333;">emptyRewriterSet</span></span>
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<pre style="margin: 0;">+<span id="LC1555" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC1556" class="line" lang="haskell"> <span class="n" style="color: #333;">go_co</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Endo</span> <span class="kt" style="color: #458; font-weight: 600;">RewriterSet</span></span>
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1557
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<pre style="margin: 0;">+<span id="LC1557" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">go_ty</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">go_co</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;">foldTyCo</span> <span class="n" style="color: #333;">folder</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1558
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<pre style="margin: 0;">+<span id="LC1558" class="line" lang="haskell"></span>
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1559
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<pre style="margin: 0;">+<span id="LC1559" class="line" lang="haskell"> <span class="n" style="color: #333;">folder</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCoFolder</span> <span class="nb" style="color: #0086b3;">()</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Endo</span> <span class="kt" style="color: #458; font-weight: 600;">RewriterSet</span><span class="p">)</span></span>
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1560
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<pre style="margin: 0;">+<span id="LC1560" class="line" lang="haskell"> <span class="n" style="color: #333;">folder</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TyCoFolder</span></span>
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1561
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<pre style="margin: 0;">+<span id="LC1561" class="line" lang="haskell"> <span class="p">{</span> <span class="n" style="color: #333;">tcf_view</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">noView</span></span>
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1562
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<pre style="margin: 0;">+<span id="LC1562" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcf_tyvar</span> <span class="o" style="font-weight: 600;">=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">go_ty</span> <span class="p">(</span><span class="n" style="color: #333;">tyVarKind</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span></span>
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1563
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<pre style="margin: 0;">+<span id="LC1563" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcf_covar</span> <span class="o" style="font-weight: 600;">=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">cv</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">go_ty</span> <span class="p">(</span><span class="n" style="color: #333;">varType</span> <span class="n" style="color: #333;">cv</span><span class="p">)</span></span>
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1564
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<pre style="margin: 0;">+<span id="LC1564" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcf_hole</span> <span class="o" style="font-weight: 600;">=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">hole</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">coerce</span> <span class="p">(`</span><span class="n" style="color: #333;">addOneToUniqSet</span><span class="p">`</span> <span class="n" style="color: #333;">hole</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">S</span><span class="o" style="font-weight: 600;">.<></span></span>
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1565
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<pre style="margin: 0;">+<span id="LC1565" class="line" lang="haskell"> <span class="n" style="color: #333;">go_ty</span> <span class="p">(</span><span class="n" style="color: #333;">varType</span> <span class="p">(</span><span class="n" style="color: #333;">coHoleCoVar</span> <span class="n" style="color: #333;">hole</span><span class="p">))</span></span>
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1566
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<pre style="margin: 0;">+<span id="LC1566" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcf_tycobinder</span> <span class="o" style="font-weight: 600;">=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span> <span class="p">}</span></span>
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1567
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<pre style="margin: 0;">+<span id="LC1567" class="line" lang="haskell"></span>
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1568
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<pre style="margin: 0;">+<span id="LC1568" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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1569
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<pre style="margin: 0;">+<span id="LC1569" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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1570
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<pre style="margin: 0;">+<span id="LC1570" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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1571
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<pre style="margin: 0;">+<span id="LC1571" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> CtFlavour</span></span>
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1572
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<pre style="margin: 0;">+<span id="LC1572" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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1573
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<pre style="margin: 0;">+<span id="LC1573" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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1583
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1574
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<pre style="margin: 0;"> <span id="LC1574" class="line" lang="haskell"></span>
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1584
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1575
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<pre style="margin: 0;"> <span id="LC1575" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Constraint flavours]</span></span>
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1585
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1576
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<pre style="margin: 0;"> <span id="LC1576" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~</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">@@ -1743,9 +1734,9 @@ eqMayRewriteFR fr1 fr2 = eqCanRewriteFR fr1 fr2</td>
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<pre style="margin: 0;"> <span id="LC1734" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1735" class="line" lang="haskell"><span class="cd">-- | Checks if the first flavour rewriting the second is a wanted</span></span>
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1736
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<pre style="margin: 0;"> <span id="LC1736" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- rewriting a wanted. See Note [Wanteds rewrite Wanteds]</span></span>
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<pre style="margin: 0;">-<span id="LC1746" class="line" lang="haskell"><span class="n" style="color: #333;">wantedRewriteWanted</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtFlavourRole</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtFlavourRole</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">WRWFlag</span></span></span>
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1747
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<pre style="margin: 0;">-<span id="LC1747" class="line" lang="haskell"><span class="n" style="color: #333;">wantedRewriteWanted</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Wanted</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="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">YesWRW</span></span></span>
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1748
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<pre style="margin: 0;">-<span id="LC1748" class="line" lang="haskell"><span class="n" style="color: #333;">wantedRewriteWanted</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">NoWRW</span></span></span>
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<pre style="margin: 0;">+<span id="LC1737" class="line" lang="haskell"><span class="n" style="color: #333;">wantedRewriteWanted</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtFlavourRole</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtFlavourRole</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">Bool</span></span></span>
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1738
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<pre style="margin: 0;">+<span id="LC1738" class="line" lang="haskell"><span class="n" style="color: #333;">wantedRewriteWanted</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Wanted</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="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">True</span></span></span>
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1739
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<pre style="margin: 0;">+<span id="LC1739" class="line" lang="haskell"><span class="n" style="color: #333;">wantedRewriteWanted</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">False</span></span></span>
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<pre style="margin: 0;"> <span id="LC1740" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- It doesn't matter what the second argument is; it can only</span></span>
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<pre style="margin: 0;"> <span id="LC1741" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- be Wanted or Derived anyway</span></span>
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<pre style="margin: 0;"> <span id="LC1742" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/f5433f0bc06f65deb96a44b62d47875ec4bc5b38...5d3804aec65f0801363c28ca3bb8a15f4ef3e6db#94c96afe1bb3b771ffbcfeeca34ce43ebbe76ccb"><strong>compiler/GHC/Tc/Utils/TcMType.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -89,7 +89,11 @@ module GHC.Tc.Utils.TcMType (</td>
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<pre style="margin: 0;"> <span id="LC89" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC90" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">------------------------------</span></span>
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<pre style="margin: 0;"> <span id="LC91" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Levity polymorphism</span></span>
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<pre style="margin: 0;">-<span id="LC92" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">ensureNotLevPoly</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">checkForLevPoly</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">checkForLevPolyX</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">formatLevPolyErr</span></span>
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<pre style="margin: 0;">+<span id="LC92" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">ensureNotLevPoly</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">checkForLevPoly</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">checkForLevPolyX</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">formatLevPolyErr</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC93" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC94" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">------------------------------</span></span>
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<pre style="margin: 0;">+<span id="LC95" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Other</span></span>
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<pre style="margin: 0;">+<span id="LC96" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">anyUnfilledCoercionHoles</span></span>
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97
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<pre style="margin: 0;"> <span id="LC97" class="line" lang="haskell"> <span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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98
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<pre style="margin: 0;"> <span id="LC98" class="line" lang="haskell"></span>
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99
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<pre style="margin: 0;"> <span id="LC99" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="n" style="color: #333;">include</span> <span class="s" style="color: #d14;">"HsVersions.h"</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">@@ -190,7 +194,7 @@ newWanted orig t_or_k pty</td>
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190
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194
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<pre style="margin: 0;"> <span id="LC194" 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;">pty</span></span>
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191
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195
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<pre style="margin: 0;"> <span id="LC195" class="line" lang="haskell"> <span class="p">,</span> <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>
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192
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196
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<pre style="margin: 0;"> <span id="LC196" 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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193
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<pre style="margin: 0;">-<span id="LC193" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_re<span class="idiff left">port_as</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">CtReportAsSame</span></span> <span class="p">}</span></span>
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197
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<pre style="margin: 0;">+<span id="LC197" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_re<span class="idiff left">writers</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 right">emptyRewriterSet</span></span> <span class="p">}</span></span>
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194
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198
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<pre style="margin: 0;"> <span id="LC198" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC199" class="line" lang="haskell"><span class="n" style="color: #333;">newWanteds</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtOrigin</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ThetaType</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;">CtEvidence</span><span class="p">]</span></span>
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196
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<pre style="margin: 0;"> <span id="LC200" class="line" lang="haskell"><span class="n" style="color: #333;">newWanteds</span> <span class="n" style="color: #333;">orig</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">newWanted</span> <span class="n" style="color: #333;">orig</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</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">@@ -254,7 +258,7 @@ emitWantedEq origin t_or_k role ty1 ty2</td>
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<pre style="margin: 0;"> <span id="LC258" class="line" lang="haskell"> <span class="p">,</span> <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;">HoleDest</span> <span class="n" style="color: #333;">hole</span></span>
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<pre style="margin: 0;"> <span id="LC259" class="line" lang="haskell"> <span class="p">,</span> <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>
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<pre style="margin: 0;"> <span id="LC260" 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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<pre style="margin: 0;">-<span id="LC257" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_re<span class="idiff left">port_as</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">CtReportAsSame</span></span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC261" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_re<span class="idiff left">writers</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 right">emptyRewriterSet</span></span> <span class="p">}</span></span>
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258
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<pre style="margin: 0;"> <span id="LC262" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HoleCo</span> <span class="n" style="color: #333;">hole</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC263" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC264" class="line" lang="haskell"> <span class="n" style="color: #333;">pty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkPrimEqPredRole</span> <span class="n" style="color: #333;">role</span> <span class="n" style="color: #333;">ty1</span> <span class="n" style="color: #333;">ty2</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">@@ -269,7 +273,7 @@ emitWantedEvVar origin ty</td>
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269
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<pre style="margin: 0;"> <span id="LC273" 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;">ty</span></span>
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270
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274
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<pre style="margin: 0;"> <span id="LC274" class="line" lang="haskell"> <span class="p">,</span> <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>
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271
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275
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<pre style="margin: 0;"> <span id="LC275" 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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<pre style="margin: 0;">-<span id="LC272" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_re<span class="idiff left">port_as</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">CtReportAsSame</span></span> <span class="p">}</span></span>
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276
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<pre style="margin: 0;">+<span id="LC276" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_re<span class="idiff left">writers</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 right">emptyRewriterSet</span></span> <span class="p">}</span></span>
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273
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277
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<pre style="margin: 0;"> <span id="LC277" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">emitSimple</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkNonCanonical</span> <span class="n" style="color: #333;">ctev</span></span>
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278
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<pre style="margin: 0;"> <span id="LC278" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">new_cv</span> <span class="p">}</span></span>
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279
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<pre style="margin: 0;"> <span id="LC279" 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">@@ -2077,18 +2081,13 @@ zonkCtEvidence ctev@(CtGiven { ctev_pred = pred })</td>
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2077
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2081
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<pre style="margin: 0;"> <span id="LC2081" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">pred'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkTcType</span> <span class="n" style="color: #333;">pred</span></span>
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2078
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2082
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<pre style="margin: 0;"> <span id="LC2082" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">ctev</span> <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;">pred'</span><span class="p">})</span> <span class="p">}</span></span>
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2079
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2083
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<pre style="margin: 0;"> <span id="LC2083" class="line" lang="haskell"><span class="n" style="color: #333;">zonkCtEvidence</span> <span class="n" style="color: #333;">ctev</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <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;">pred</span></span>
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2080
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<pre style="margin: 0;">-<span id="LC2080" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_dest</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dest</span></span>
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2081
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<pre style="margin: 0;">-<span id="LC2081" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_report_as</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">report_as</span> <span class="p">})</span></span>
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<pre style="margin: 0;">+<span id="LC2084" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_dest</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dest</span> <span class="p">})</span></span>
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2082
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2085
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<pre style="margin: 0;"> <span id="LC2085" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">pred'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkTcType</span> <span class="n" style="color: #333;">pred</span></span>
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2083
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2086
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<pre style="margin: 0;"> <span id="LC2086" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">dest'</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">dest</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2084
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2087
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<pre style="margin: 0;"> <span id="LC2087" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">EvVarDest</span> <span class="n" style="color: #333;">ev</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">EvVarDest</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">setVarType</span> <span class="n" style="color: #333;">ev</span> <span class="n" style="color: #333;">pred'</span></span>
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2085
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2088
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<pre style="margin: 0;"> <span id="LC2088" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- necessary in simplifyInfer</span></span>
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<pre style="margin: 0;"> <span id="LC2089" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">HoleDest</span> <span class="n" style="color: #333;">h</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">HoleDest</span> <span class="n" style="color: #333;">h</span></span>
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<pre style="margin: 0;">-<span id="LC2087" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">report_as'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">report_as</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC2088" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CtReportAsSame</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAsSame</span></span>
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2089
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<pre style="margin: 0;">-<span id="LC2089" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">CtReportAsOther</span> <span class="n" style="color: #333;">u</span> <span class="n" style="color: #333;">report_pred</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAsOther</span> <span class="n" style="color: #333;">u</span> <span class="o" style="font-weight: 600;"><$></span> <span class="n" style="color: #333;">zonkTcType</span> <span class="n" style="color: #333;">report_pred</span></span>
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2090
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<pre style="margin: 0;">-<span id="LC2090" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">ctev</span> <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;">pred'</span><span class="p">,</span> <span class="n" style="color: #333;">ctev_dest</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dest'</span></span>
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2091
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<pre style="margin: 0;">-<span id="LC2091" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">ctev_report_as</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">report_as'</span> <span class="p">})</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC2090" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">ctev</span> <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;">pred'</span><span class="p">,</span> <span class="n" style="color: #333;">ctev_dest</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dest'</span> <span class="p">})</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC2091" class="line" lang="haskell"><span class="n" style="color: #333;">zonkCtEvidence</span> <span class="n" style="color: #333;">ctev</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CtDerived</span> <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;">pred</span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC2092" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">pred'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkTcType</span> <span class="n" style="color: #333;">pred</span></span>
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<pre style="margin: 0;"> <span id="LC2093" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">ctev</span> <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;">pred'</span> <span class="p">})</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">@@ -2103,14 +2102,11 @@ zonkSkolemInfo (InferSkol ntys) = do { ntys' <- mapM do_one ntys</td>
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<pre style="margin: 0;"> <span id="LC2102" class="line" lang="haskell"><span class="n" style="color: #333;">zonkSkolemInfo</span> <span class="n" style="color: #333;">skol_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">skol_info</span></span>
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<pre style="margin: 0;"> <span id="LC2103" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2104" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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2106
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<pre style="margin: 0;">-<span id="LC2106" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">%************************************************************************</span></span>
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<pre style="margin: 0;">-<span id="LC2107" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">%* *</span></span>
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<pre style="margin: 0;">-<span id="LC2108" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">\subsection{Zonking -- the main work-horses: zonkTcType, zonkTcTyVar}</span></span>
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<pre style="margin: 0;">+<span id="LC2105" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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<pre style="margin: 0;"> <span id="LC2106" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<pre style="margin: 0;">-<span id="LC2110" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">* For internal use only! *</span></span></span>
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<pre style="margin: 0;">+<span id="LC2107" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right"> Zonking -- the main work-horses: zonkTcType, zonkTcTyVar</span></span></span>
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<pre style="margin: 0;"> <span id="LC2108" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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2109
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<pre style="margin: 0;"> <span id="LC2109" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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<pre style="margin: 0;">-<span id="LC2113" class="line" lang="haskell"></span>
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2114
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2110
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<pre style="margin: 0;"> <span id="LC2110" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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2111
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<pre style="margin: 0;"> <span id="LC2111" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2112" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- For unbound, mutable tyvars, zonkType uses the function given to it</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">@@ -2275,12 +2271,6 @@ tidyCt env ct = ct { cc_ev = tidyCtEvidence env (ctEvidence ct) }</td>
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<pre style="margin: 0;"> <span id="LC2271" class="line" lang="haskell"><span class="n" style="color: #333;">tidyCtEvidence</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TidyEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CtEvidence</span></span>
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<pre style="margin: 0;"> <span id="LC2272" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: we do not tidy the ctev_evar field because we don't</span></span>
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<pre style="margin: 0;"> <span id="LC2273" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- show it in error messages</span></span>
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<pre style="margin: 0;">-<span id="LC2278" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- But definitely do tidy the report_as field, as that's reported.</span></span>
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2279
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<pre style="margin: 0;">-<span id="LC2279" class="line" lang="haskell"><span class="n" style="color: #333;">tidyCtEvidence</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">ctev</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CtWanted</span> <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;">pred</span><span class="p">,</span> <span class="n" style="color: #333;">ctev_report_as</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">report_as</span> <span class="p">})</span></span>
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<pre style="margin: 0;">-<span id="LC2280" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctev</span> <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;">tidyType</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">pred</span><span class="p">,</span> <span class="n" style="color: #333;">ctev_report_as</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tidy_report_as</span> <span class="n" style="color: #333;">report_as</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC2281" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">tidy_report_as</span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAsSame</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAsSame</span></span>
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<pre style="margin: 0;">-<span id="LC2282" class="line" lang="haskell"> <span class="n" style="color: #333;">tidy_report_as</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CtReportAsOther</span> <span class="n" style="color: #333;">u</span> <span class="n" style="color: #333;">report_pred</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC2283" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CtReportAsOther</span> <span class="n" style="color: #333;">u</span> <span class="p">(</span><span class="n" style="color: #333;">tidyType</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">report_pred</span><span class="p">)</span></span>
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2284
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<pre style="margin: 0;"> <span id="LC2274" class="line" lang="haskell"><span class="n" style="color: #333;">tidyCtEvidence</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">ctev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctev</span> <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;">tidyType</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">ty</span> <span class="p">}</span></span>
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2275
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<pre style="margin: 0;"> <span id="LC2275" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2286
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2276
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<pre style="margin: 0;"> <span id="LC2276" class="line" lang="haskell"> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctev_pred</span> <span class="n" style="color: #333;">ctev</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">@@ -2330,11 +2320,11 @@ tidySigSkol env cx ty tv_prs</td>
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2330
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2320
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<pre style="margin: 0;"> <span id="LC2320" class="line" lang="haskell"></span>
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2331
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2321
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<pre style="margin: 0;"> <span id="LC2321" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-------------------------------------------------------------------------</span></span>
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<pre style="margin: 0;"> <span id="LC2322" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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<pre style="margin: 0;">-<span id="LC2333" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">%</span>************************************************************************</span></span>
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<pre style="margin: 0;">-<span id="LC2334" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">%</span>* *</span></span>
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<pre style="margin: 0;">+<span id="LC2323" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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<pre style="margin: 0;">+<span id="LC2324" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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2325
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<pre style="margin: 0;"> <span id="LC2325" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Levity polymorphism checks</span></span>
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2336
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<pre style="margin: 0;">-<span id="LC2336" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* <span class="idiff left right"> </span>*</span></span>
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2337
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<pre style="margin: 0;">-<span id="LC2337" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************<span class="idiff left right">*</span></span></span>
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<pre style="margin: 0;">+<span id="LC2326" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<pre style="margin: 0;">+<span id="LC2327" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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2328
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<pre style="margin: 0;"> <span id="LC2328" class="line" lang="haskell"></span>
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2329
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<pre style="margin: 0;"> <span id="LC2329" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See Note [Levity polymorphism checking] in GHC.HsToCore.Monad</span></span>
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2330
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<pre style="margin: 0;"> <span id="LC2330" 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">@@ -2424,3 +2414,46 @@ naughtyQuantification orig_ty tv escapees</td>
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2414
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<pre style="margin: 0;"> <span id="LC2414" class="line" lang="haskell"> <span class="p">]</span></span>
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2415
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<pre style="margin: 0;"> <span id="LC2415" class="line" lang="haskell"></span>
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2426
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2416
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<pre style="margin: 0;"> <span id="LC2416" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">failWithTcM</span> <span class="p">(</span><span class="n" style="color: #333;">env</span><span class="p">,</span> <span class="n" style="color: #333;">doc</span><span class="p">)</span> <span class="p">}</span></span>
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2417
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<pre style="margin: 0;">+<span id="LC2417" class="line" lang="haskell"></span>
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2418
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<pre style="margin: 0;">+<span id="LC2418" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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2419
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<pre style="margin: 0;">+<span id="LC2419" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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2420
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<pre style="margin: 0;">+<span id="LC2420" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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2421
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<pre style="margin: 0;">+<span id="LC2421" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Checking for coercion holes</span></span>
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2422
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<pre style="margin: 0;">+<span id="LC2422" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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2423
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<pre style="margin: 0;">+<span id="LC2423" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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2424
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<pre style="margin: 0;">+<span id="LC2424" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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2425
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<pre style="margin: 0;">+<span id="LC2425" class="line" lang="haskell"></span>
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2426
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<pre style="margin: 0;">+<span id="LC2426" class="line" lang="haskell"><span class="cd">-- | Check whether any coercion hole in a RewriterSet is still unsolved.</span></span>
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2427
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<pre style="margin: 0;">+<span id="LC2427" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Does this by recursively looking through filled coercion holes until</span></span>
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2428
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<pre style="margin: 0;">+<span id="LC2428" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- one is found that is not yet filled in, at which point this aborts.</span></span>
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2429
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<pre style="margin: 0;">+<span id="LC2429" class="line" lang="haskell"><span class="n" style="color: #333;">anyUnfilledCoercionHoles</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">RewriterSet</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;">Bool</span></span>
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2430
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<pre style="margin: 0;">+<span id="LC2430" class="line" lang="haskell"><span class="n" style="color: #333;">anyUnfilledCoercionHoles</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RewriterSet</span> <span class="n" style="color: #333;">set</span><span class="p">)</span></span>
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2431
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<pre style="margin: 0;">+<span id="LC2431" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">nonDetFoldUniqSet</span> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">)</span> <span class="n" style="color: #333;">set</span></span>
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2432
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<pre style="margin: 0;">+<span id="LC2432" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2433
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<pre style="margin: 0;">+<span id="LC2433" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CoercionHole</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;">Bool</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;">Bool</span></span>
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2434
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<pre style="margin: 0;">+<span id="LC2434" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">hole</span> <span class="n" style="color: #333;">m_acc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">m_acc</span> <span class="o" style="font-weight: 600;"><||></span> <span class="n" style="color: #333;">check_hole</span> <span class="n" style="color: #333;">hole</span></span>
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2435
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<pre style="margin: 0;">+<span id="LC2435" class="line" lang="haskell"></span>
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2436
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<pre style="margin: 0;">+<span id="LC2436" class="line" lang="haskell"> <span class="n" style="color: #333;">check_hole</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CoercionHole</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;">Bool</span></span>
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2437
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<pre style="margin: 0;">+<span id="LC2437" class="line" lang="haskell"> <span class="n" style="color: #333;">check_hole</span> <span class="n" style="color: #333;">hole</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">m_co</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unpackCoercionHole_maybe</span> <span class="n" style="color: #333;">hole</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2438" 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">
2438
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<pre style="margin: 0;">+<span id="LC2438" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">m_co</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2439" 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">
2439
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<pre style="margin: 0;">+<span id="LC2439" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="c1" style="color: #998; font-style: italic;">-- unfilled hole</span></span>
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2440
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<pre style="margin: 0;">+<span id="LC2440" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">unUCHM</span> <span class="p">(</span><span class="n" style="color: #333;">check_co</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="p">}</span></span>
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2441
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<pre style="margin: 0;">+<span id="LC2441" class="line" lang="haskell"></span>
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2442
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<pre style="margin: 0;">+<span id="LC2442" class="line" lang="haskell"> <span class="n" style="color: #333;">check_ty</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;">UnfilledCoercionHoleMonoid</span></span>
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2443
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<pre style="margin: 0;">+<span id="LC2443" class="line" lang="haskell"> <span class="n" style="color: #333;">check_co</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">UnfilledCoercionHoleMonoid</span></span>
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2444
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<pre style="margin: 0;">+<span id="LC2444" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">check_ty</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">check_co</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;">foldTyCo</span> <span class="n" style="color: #333;">folder</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC2446" class="line" lang="haskell"> <span class="n" style="color: #333;">folder</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCoFolder</span> <span class="nb" style="color: #0086b3;">()</span> <span class="kt" style="color: #458; font-weight: 600;">UnfilledCoercionHoleMonoid</span></span>
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<pre style="margin: 0;">+<span id="LC2447" class="line" lang="haskell"> <span class="n" style="color: #333;">folder</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TyCoFolder</span> <span class="p">{</span> <span class="n" style="color: #333;">tcf_view</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">noView</span></span>
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<pre style="margin: 0;">+<span id="LC2448" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcf_tyvar</span> <span class="o" style="font-weight: 600;">=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">check_ty</span> <span class="p">(</span><span class="n" style="color: #333;">tyVarKind</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2449" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcf_covar</span> <span class="o" style="font-weight: 600;">=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">cv</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">check_ty</span> <span class="p">(</span><span class="n" style="color: #333;">varType</span> <span class="n" style="color: #333;">cv</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2450" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcf_hole</span> <span class="o" style="font-weight: 600;">=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">UCHM</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">check_hole</span></span>
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<pre style="margin: 0;">+<span id="LC2451" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">tcf_tycobinder</span> <span class="o" style="font-weight: 600;">=</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC2452" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2453" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">UnfilledCoercionHoleMonoid</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">UCHM</span> <span class="p">{</span> <span class="n" style="color: #333;">unUCHM</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;">Bool</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC2454" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2455" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Semigroup</span> <span class="kt" style="color: #458; font-weight: 600;">UnfilledCoercionHoleMonoid</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC2456" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">UCHM</span> <span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;"><></span> <span class="kt" style="color: #458; font-weight: 600;">UCHM</span> <span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">UCHM</span> <span class="p">(</span><span class="n" style="color: #333;">l</span> <span class="o" style="font-weight: 600;"><||></span> <span class="n" style="color: #333;">r</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2457" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2458" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Monoid</span> <span class="kt" style="color: #458; font-weight: 600;">UnfilledCoercionHoleMonoid</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC2459" class="line" lang="haskell"> <span class="n" style="color: #333;">mempty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">UCHM</span> <span class="p">(</span><span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">)</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/f5433f0bc06f65deb96a44b62d47875ec4bc5b38...5d3804aec65f0801363c28ca3bb8a15f4ef3e6db#3f09f54f5246ba5ea580755fff657723a4077bea"><strong>testsuite/tests/partial-sigs/should_fail/T10999.stderr</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -17,15 +17,15 @@ T10999.hs:5:17: error:</td>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="plaintext"> In the type signature: f :: _ => () -> _</span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="plaintext"></span>
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19
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="plaintext">T10999.hs:8:28: error:</span>
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<pre style="margin: 0;">-<span id="LC20" class="line" lang="plaintext"> • Ambiguous type variable ‘b<span class="idiff left right">0</span>’ arising from a use of ‘f’</span>
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<pre style="margin: 0;">-<span id="LC21" class="line" lang="plaintext"> prevents the constraint ‘(Ord b<span class="idiff left right">0</span>)’ from being solved.</span>
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<pre style="margin: 0;">-<span id="LC22" class="line" lang="plaintext"> Relevant bindings include g :: [b<span class="idiff left right">0</span>] (bound at T10999.hs:8:1)</span>
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<pre style="margin: 0;">-<span id="LC23" class="line" lang="plaintext"> Probable fix: use a type annotation to specify what ‘b<span class="idiff left right">0</span>’ should be.</span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="plaintext"> • Ambiguous type variable ‘b<span class="idiff left right">1</span>’ arising from a use of ‘f’</span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="plaintext"> prevents the constraint ‘(Ord b<span class="idiff left right">1</span>)’ from being solved.</span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="plaintext"> Relevant bindings include g :: [b<span class="idiff left right">1</span>] (bound at T10999.hs:8:1)</span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="plaintext"> Probable fix: use a type annotation to specify what ‘b<span class="idiff left right">1</span>’ should be.</span>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="plaintext"> These potential instances exist:</span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="plaintext"> instance Ord a => Ord (Set.Set a) -- Defined in ‘Data.Set.Internal’</span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="plaintext"> instance Ord Ordering -- Defined in ‘GHC.Classes’</span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="plaintext"> instance Ord Integer</span>
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<pre style="margin: 0;">-<span id="LC28" class="line" lang="plaintext"> -- Defined in ‘integer-gmp-1.0.<span class="idiff left right">1</span>.0:GHC.Integer.Type’</span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="plaintext"> -- Defined in ‘integer-gmp-1.0.<span class="idiff left right">3</span>.0:GHC.Integer.Type’</span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="plaintext"> ...plus 22 others</span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="plaintext"> ...plus three instances involving out-of-scope types</span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="plaintext"> (use -fprint-potential-instances to see them all)</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/f5433f0bc06f65deb96a44b62d47875ec4bc5b38...5d3804aec65f0801363c28ca3bb8a15f4ef3e6db#4c5de4968cdc95ac52e3a556a04a81ac8c2db89b"><strong>testsuite/tests/typecheck/should_fail/T12785b.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">T12785b.hs:29:65: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • Could not deduce: <span class="idiff left right">s ~ Payload ('S n) (Payload n s1)</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Could not deduce: <span class="idiff left right">Payload ('S n) (Payload n s1) ~ s</span></span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"> arising from a use of ‘SBranchX’</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> from the context: m ~ 'S n</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> bound by a pattern with constructor:</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/f5433f0bc06f65deb96a44b62d47875ec4bc5b38...5d3804aec65f0801363c28ca3bb8a15f4ef3e6db#79d888b8ac34c7cc936b21885c2d61f40d3e8bf3"><strong>testsuite/tests/typecheck/should_fail/T15648.stderr</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -11,13 +11,20 @@ T15648.hs:23:21: error:</td>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="plaintext"> legitToJank :: LegitEquality a b -> JankyEquality a b</span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="plaintext"> (bound at T15648.hs:23:1)</span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC14" class="line" lang="plaintext">T15648.hs:30:10: error:</span>
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<pre style="margin: 0;">-<span id="LC15" class="line" lang="plaintext"> • Couldn't match expected type ‘(a GHC.Prim.~# b)</span>
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<pre style="margin: 0;">-<span id="LC16" class="line" lang="plaintext"> -> b GHC.Prim.~# a’</span>
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<pre style="margin: 0;">-<span id="LC17" class="line" lang="plaintext"> with actual type ‘b GHC.Prim.~# a’</span>
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<pre style="margin: 0;">-<span id="LC18" class="line" lang="plaintext"> • In the expression: unJank $ legitToJank $ mkLegit @b @a</span>
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<pre style="margin: 0;">-<span id="LC19" class="line" lang="plaintext"> In an equation for ‘ueqSym’:</span>
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<pre style="margin: 0;">-<span id="LC20" class="line" lang="plaintext"> ueqSym = unJank $ legitToJank $ mkLegit @b @a</span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext">T15648.hs:30:33: error:</span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="plaintext"> • Couldn't match expected type ‘a’ with actual type ‘b’</span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="plaintext"> ‘b’ is a rigid type variable bound by</span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="plaintext"> the type signature for:</span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext"> ueqSym :: forall a b. (a GHC.Prim.~# b) -> b GHC.Prim.~# a</span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="plaintext"> at T15648.hs:(28,1)-(29,32)</span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="plaintext"> ‘a’ is a rigid type variable bound by</span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="plaintext"> the type signature for:</span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="plaintext"> ueqSym :: forall a b. (a GHC.Prim.~# b) -> b GHC.Prim.~# a</span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="plaintext"> at T15648.hs:(28,1)-(29,32)</span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="plaintext"> • In the second argument of ‘($)’, namely ‘mkLegit @b @a’</span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="plaintext"> In the second argument of ‘($)’, namely</span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="plaintext"> ‘legitToJank $ mkLegit @b @a’</span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="plaintext"> In the expression: unJank $ legitToJank $ mkLegit @b @a</span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="plaintext"> • Relevant bindings include</span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="plaintext"> ueqSym :: (a GHC.Prim.~# b) -> b GHC.Prim.~# a</span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="plaintext"> (bound at T15648.hs:30:1)</span></pre>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC2" class="line" lang="plaintext">T8450.hs:8:<span class="idiff left right">7</span>: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • Couldn't match <span class="idiff left right">expected type ‘a’ with actual type ‘()</span>’</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T8450.hs:8:<span class="idiff left right">20</span>: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Couldn't match <span class="idiff left right">type ‘a’ with ‘Bool</span>’</span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"> ‘a’ is a rigid type variable bound by</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> the type signature for:</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> run :: forall a. a</span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext"> at T8450.hs:7:1-18</span>
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<pre style="margin: 0;">-<span id="LC8" class="line" lang="plaintext"> • In the expression: runEffect $ (undefined :: Either a ())</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext"> Expected type: Either Bool ()</span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext"> Actual type: Either a ()</span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext"> • In the second argument of ‘($)’, namely</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext"> ‘(undefined :: Either a ())’</span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext"> In the expression: runEffect $ (undefined :: Either a ())</span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="plaintext"> In an equation for ‘run’:</span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="plaintext"> run = runEffect $ (undefined :: Either a ())</span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="plaintext"> • Relevant bindings include run :: a (bound at T8450.hs:8:1)</span></pre>
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