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GitLab

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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/bb7b331e9627c637fc7ac5f7cdacacd5b9dfc665">bb7b331e</a></strong>

<div>

<span>by Richard Eisenberg</span>

<i>at 2020-06-25T17:40:07+01:00</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Checkpoint for CI.

</pre>

</li>

</ul>

<h4>18 changed files:</h4>

<ul>

<li class="file-stats">

<a href="#e4b9d5e9d2de37561bfd06a2c97a5c924a1bab76">

compiler/GHC/Tc/Errors.hs

</a>

</li>

<li class="file-stats">

<a href="#f639b0b31b7245cb7d34ac190b798f5ec1c7da2e">

compiler/GHC/Tc/Solver/Interact.hs

</a>

</li>

<li class="file-stats">

<a href="#3b6d78a50c8462304f843b952a88e531718dbbd2">

compiler/GHC/Tc/Types/Constraint.hs

</a>

</li>

<li class="file-stats">

<a href="#94c96afe1bb3b771ffbcfeeca34ce43ebbe76ccb">

compiler/GHC/Tc/Utils/TcMType.hs

</a>

</li>

<li class="file-stats">

<a href="#1f9de42e0bb78f1ddb90ed735ee9bb960f7ff55f">

testsuite/tests/indexed-types/should_fail/ExplicitForAllFams4b.hs

</a>

</li>

<li class="file-stats">

<a href="#2fde7ac433f0aa93d0eb250c22f88389607cd467">

testsuite/tests/indexed-types/should_fail/ExplicitForAllFams4b.stderr

</a>

</li>

<li class="file-stats">

<a href="#643cdd7f1c5109029bf84ca29e7eb9f8e6aef56f">

testsuite/tests/indexed-types/should_fail/SimpleFail2a.stderr

</a>

</li>

<li class="file-stats">

<a href="#dbbedd3ff17de84fe40d4974624d5d744d7a9c4c">

testsuite/tests/indexed-types/should_fail/SimpleFail9.stderr

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<li class="file-stats">

<a href="#0e6f1fde7dd2367324e045a317061cd856425cd3">

<span class="deleted-file">

−

testsuite/tests/typecheck/should_compile/FD1.stderr

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<li class="file-stats">

<a href="#34fe7bf0e6fbf60effb28393399ba68666593909">

testsuite/tests/typecheck/should_compile/all.T

</a>

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<li class="file-stats">

<a href="#f72282051f998cf10c629b48eaa08cc0a6e3dd08">

testsuite/tests/typecheck/should_compile/hole_constraints.stderr

</a>

</li>

<li class="file-stats">

<a href="#666f7d6000ff54754c94c22deb5616f72df2a658">

testsuite/tests/typecheck/should_compile/FD1.hs

→

testsuite/tests/typecheck/should_fail/FD1.hs

</a>

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<li class="file-stats">

<a href="#3ef98634a1bdeb088e72b4c97ff5d75a30ba8198">

<span class="new-file">

+

testsuite/tests/typecheck/should_fail/FD1.stderr

</span>

</a>

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<li class="file-stats">

<a href="#e659fc9eb3ffe008ca14824a025aec80116818a6">

testsuite/tests/typecheck/should_compile/FD2.hs

→

testsuite/tests/typecheck/should_fail/FD2.hs

</a>

</li>

<li class="file-stats">

<a href="#aa0069afd943eaf94dac358f5c78d93ab7c32a2e">

testsuite/tests/typecheck/should_compile/FD2.stderr

→

testsuite/tests/typecheck/should_fail/FD2.stderr

</a>

</li>

<li class="file-stats">

<a href="#ad20f339e204ee2dba7eaae3efe1efdbaa9a3653">

testsuite/tests/typecheck/should_compile/FD3.hs

→

testsuite/tests/typecheck/should_fail/FD3.hs

</a>

</li>

<li class="file-stats">

<a href="#2dd9f1533bf22f58b7b404994ccdf1fbe3668f61">

testsuite/tests/typecheck/should_compile/FD3.stderr

→

testsuite/tests/typecheck/should_fail/FD3.stderr

</a>

</li>

<li class="file-stats">

<a href="#b9e86d897a62509b0114d81d5e736630d6f68f43">

testsuite/tests/typecheck/should_fail/all.T

</a>

</li>

</ul>

<h4>Changes:</h4>

<li id="e4b9d5e9d2de37561bfd06a2c97a5c924a1bab76">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bb7b331e9627c637fc7ac5f7cdacacd5b9dfc665#e4b9d5e9d2de37561bfd06a2c97a5c924a1bab76"><strong>compiler/GHC/Tc/Errors.hs</strong></a>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="662" 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">@@ -662,7 +662,14 @@ reportWanteds ctxt tc_lvl (WC { wc_simple = simples, wc_impl = implics</td>

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662

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<td class="diff-line-num new_line" data-linenumber="662" 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">

662

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<pre style="margin: 0;"> <span id="LC662" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="663" 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">

663

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<td class="diff-line-num new_line" data-linenumber="663" 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">

663

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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>

</pre>

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<td class="diff-line-num old_line" data-linenumber="664" 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">

664

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<td class="diff-line-num new_line" data-linenumber="664" 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">

664

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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>

</pre>

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665

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<td class="diff-line-num new_line old" data-linenumber="665" 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="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>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="665" 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">

665

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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>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="666" 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">

666

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<pre style="margin: 0;">+<span id="LC666" class="line" lang="haskell">      <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Wanted</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ei_flavour</span> <span class="n" style="color: #333;">item</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="667" 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">

667

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<pre style="margin: 0;">+<span id="LC667" 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>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="668" 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="LC668" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- "RAE"        || (not has_gadt_match_here &&</span></span>

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<td class="diff-line-num new old_line" data-linenumber="666" 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="669" 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">

669

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<pre style="margin: 0;">+<span id="LC669" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">            is_given_eq item (classifyPredType (ei_pred item)))</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="670" 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">

670

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<pre style="margin: 0;">+<span id="LC670" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="671" 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">

671

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<pre style="margin: 0;">+<span id="LC671" class="line" lang="haskell">      <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="672" 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="LC672" class="line" lang="haskell">      <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>

</pre>

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666

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<td class="diff-line-num new_line" data-linenumber="673" 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">

673

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<pre style="margin: 0;"> <span id="LC673" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;"> <span id="LC674" 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="LC675" 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">@@ -693,14 +700,16 @@ reportWanteds ctxt tc_lvl (WC { wc_simple = simples, wc_impl = implics</td>

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<pre style="margin: 0;"> <span id="LC700" class="line" lang="haskell">              <span class="p">,</span> <span class="p">(</span><span class="s" style="color: #d14;">"Dicts"</span><span class="p">,</span>           <span class="n" style="color: #333;">is_dict</span><span class="p">,</span>         <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">,</span> <span class="n" style="color: #333;">mkGroupReporter</span> <span class="n" style="color: #333;">mkDictErr</span><span class="p">)</span> <span class="p">]</span></span>

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<pre style="margin: 0;"> <span id="LC701" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC702" 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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<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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<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>

</pre>

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<pre style="margin: 0;">+<span id="LC703" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- or report2. Keep this in sync with the suppress function above</span></span>

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<pre style="margin: 0;">+<span id="LC704" 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>

</pre>

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<pre style="margin: 0;">+<span id="LC705" class="line" lang="haskell">              <span class="p">,</span> <span class="p">(</span><span class="s" style="color: #d14;">"insoluble1c"</span><span class="p">,</span> <span class="n" style="color: #333;">is_given_eq</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;">mkGivenErrorReporter</span> <span class="p">)</span> <span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- "RAE"</span></span>

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<pre style="margin: 0;"> <span id="LC706" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC707" 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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<pre style="margin: 0;"> <span id="LC708" 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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<pre style="margin: 0;"> <span id="LC709" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC710" class="line" lang="haskell">    <span class="n" style="color: #333;">is_given_eq</span> <span class="n" style="color: #333;">item</span> <span class="n" style="color: #333;">pred</span></span>

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<pre style="margin: 0;">-<span id="LC703" class="line" lang="haskell">       <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">EqPred</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">arisesFromGivens</span> <span class="p">(</span><span class="n" style="color: #333;">ei_flavour</span> <span class="n" style="color: #333;">item</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">ei_loc</span> <span class="n" style="color: #333;">item</span><span class="p">)</span></span>

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<pre style="margin: 0;">+<span id="LC711" class="line" lang="haskell">       <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Given</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ei_flavour</span> <span class="n" style="color: #333;">item</span></span>

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<td class="diff-line-num new old_line" data-linenumber="704" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="712" 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">

712

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<pre style="margin: 0;">+<span id="LC712" class="line" lang="haskell">       <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">EqPred</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pred</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="704" 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">

704

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<td class="diff-line-num new_line" data-linenumber="713" 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">

713

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<pre style="margin: 0;"> <span id="LC713" class="line" lang="haskell">       <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span>         <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>

</pre>

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<td class="diff-line-num 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">

705

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<td class="diff-line-num new_line" data-linenumber="714" 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">

714

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<pre style="margin: 0;"> <span id="LC714" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- I think all given residuals are equalities</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="706" 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">

706

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<td class="diff-line-num new_line" data-linenumber="715" 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">

715

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<pre style="margin: 0;"> <span id="LC715" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="742" 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="751" 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">@@ -742,7 +751,7 @@ reportWanteds ctxt tc_lvl (WC { wc_simple = simples, wc_impl = implics</td>

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<td class="diff-line-num old_line" data-linenumber="742" 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">

742

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<td class="diff-line-num new_line" data-linenumber="751" 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">

751

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<pre style="margin: 0;"> <span id="LC751" class="line" lang="haskell">    <span class="n" style="color: #333;">is_ww_fundep_item</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isWantedWantedFunDepOrigin</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">errorItemOrigin</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="743" 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">

743

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<td class="diff-line-num new_line" data-linenumber="752" 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">

752

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<pre style="margin: 0;"> <span id="LC752" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="744" 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">

744

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<td class="diff-line-num new_line" data-linenumber="753" 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">

753

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<pre style="margin: 0;"> <span id="LC753" class="line" lang="haskell">    <span class="n" style="color: #333;">given_eq_spec</span>  <span class="c1" style="color: #998; font-style: italic;">-- See Note [Given errors]</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="745" 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">

745

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<td class="diff-line-num new_line old" data-linenumber="754" 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="LC745" class="line" lang="haskell">      <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">has_gadt_match</span><span class="idiff left"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">cec_encl</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ctxt</span></span><span class="p"><span class="idiff right">)</span></span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="746" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="754" 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">

754

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<pre style="margin: 0;">+<span id="LC754" class="line" lang="haskell">      <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">has_gadt_match<span class="idiff left right">_here</span></span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="746" 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">

746

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<td class="diff-line-num new_line" data-linenumber="755" 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">

755

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<pre style="margin: 0;"> <span id="LC755" class="line" lang="haskell">      <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="s" style="color: #d14;">"insoluble1a"</span><span class="p">,</span> <span class="n" style="color: #333;">is_given_eq</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;">mkGivenErrorReporter</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="747" 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">

747

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<td class="diff-line-num new_line" data-linenumber="756" 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">

756

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<pre style="margin: 0;"> <span id="LC756" class="line" lang="haskell">      <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="748" 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">

748

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<td class="diff-line-num new_line" data-linenumber="757" 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">

757

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<pre style="margin: 0;"> <span id="LC757" class="line" lang="haskell">      <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="s" style="color: #d14;">"insoluble1b"</span><span class="p">,</span> <span class="n" style="color: #333;">is_given_eq</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">,</span> <span class="n" style="color: #333;">ignoreErrorReporter</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="753" 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="762" 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">@@ -753,6 +762,7 @@ reportWanteds ctxt tc_lvl (WC { wc_simple = simples, wc_impl = implics</td>

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<td class="diff-line-num old_line" data-linenumber="753" 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">

753

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<td class="diff-line-num new_line" data-linenumber="762" 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">

762

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<pre style="margin: 0;"> <span id="LC762" class="line" lang="haskell">          <span class="c1" style="color: #998; font-style: italic;">--         #13446 is an example</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="754" 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">

754

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<td class="diff-line-num new_line" data-linenumber="763" 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">

763

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<pre style="margin: 0;"> <span id="LC763" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="755" 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">

755

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<td class="diff-line-num new_line" data-linenumber="764" 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">

764

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<pre style="margin: 0;"> <span id="LC764" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- See Note [Given errors]</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="756" 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="765" 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">

765

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<pre style="margin: 0;">+<span id="LC765" class="line" lang="haskell">    <span class="n" style="color: #333;">has_gadt_match_here</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">has_gadt_match</span> <span class="p">(</span><span class="n" style="color: #333;">cec_encl</span> <span class="n" style="color: #333;">ctxt</span><span class="p">)</span></span>

</pre>

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756

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<td class="diff-line-num new_line" data-linenumber="766" 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">

766

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<pre style="margin: 0;"> <span id="LC766" class="line" lang="haskell">    <span class="n" style="color: #333;">has_gadt_match</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="757" 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">

757

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<td class="diff-line-num new_line" data-linenumber="767" 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">

767

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<pre style="margin: 0;"> <span id="LC767" class="line" lang="haskell">    <span class="n" style="color: #333;">has_gadt_match</span> <span class="p">(</span><span class="n" style="color: #333;">implic</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">implics</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="758" 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">

758

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<td class="diff-line-num new_line" data-linenumber="768" 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">

768

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<pre style="margin: 0;"> <span id="LC768" class="line" lang="haskell">      <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">PatSkol</span> <span class="p">{}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ic_info</span> <span class="n" style="color: #333;">implic</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="787" 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="797" 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">@@ -787,9 +797,9 @@ isTyFun_maybe ty = case tcSplitTyConApp_maybe ty of</td>

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<td class="diff-line-num old_line" data-linenumber="787" 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">

787

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<td class="diff-line-num new_line" data-linenumber="797" 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">

797

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<pre style="margin: 0;"> <span id="LC797" 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>

</pre>

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<td class="diff-line-num old_line" data-linenumber="788" 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">

788

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<td class="diff-line-num new_line" data-linenumber="798" 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">

798

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<pre style="margin: 0;"> <span id="LC798" 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>

</pre>

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<td class="diff-line-num old_line" data-linenumber="789" 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">

789

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<td class="diff-line-num new_line" data-linenumber="799" 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">

799

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<pre style="margin: 0;"> <span id="LC799" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="790" 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">

790

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<td class="diff-line-num new_line old" data-linenumber="800" 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="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>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="791" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="800" 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">

800

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<pre style="margin: 0;">+<span id="LC800" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Which errors:</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="791" 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">

791

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<td class="diff-line-num new_line" data-linenumber="801" 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">

801

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<pre style="margin: 0;"> <span id="LC801" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="792" 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">

792

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<td class="diff-line-num new_line old" data-linenumber="802" 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="LC792" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">  </span> Errors which arise from the interaction of two Wanted fun-dep constraints.</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="793" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="802" 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">

802

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<pre style="margin: 0;">+<span id="LC802" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">1)</span> Errors which arise from the interaction of two Wanted fun-dep constraints.</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="793" 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">

793

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<td class="diff-line-num new_line" data-linenumber="803" 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">

803

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<pre style="margin: 0;"> <span id="LC803" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   Example:</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="794" 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">

794

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<td class="diff-line-num new_line" data-linenumber="804" 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">

804

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<pre style="margin: 0;"> <span id="LC804" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="795" 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">

795

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<td class="diff-line-num new_line" data-linenumber="805" 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">

805

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<pre style="margin: 0;"> <span id="LC805" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">     class C a b | a -> b where</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="817" 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="827" 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">@@ -817,6 +827,14 @@ Which errors (right now, only 1, but this may grow):</td>

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<td class="diff-line-num old_line" data-linenumber="817" 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">

817

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<td class="diff-line-num new_line" data-linenumber="827" 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">

827

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<pre style="margin: 0;"> <span id="LC827" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   both are givens, the error represents unreachable code. For</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="818" 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">

818

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<td class="diff-line-num new_line" data-linenumber="828" 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">

828

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<pre style="margin: 0;"> <span id="LC828" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   a Given/Wanted case, see #9612.</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="819" 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">

819

</td>

<td class="diff-line-num new_line" data-linenumber="829" 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">

829

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<pre style="margin: 0;"> <span id="LC829" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="820" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="830" 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">

830

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<pre style="margin: 0;">+<span id="LC830" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">2) Errors which arise from given functional dependencies. Functional</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="820" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="831" 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">

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;">   dependencies have no evidence, and so they are always Wanted -- we have no</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="820" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="832" 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">

832

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<pre style="margin: 0;">+<span id="LC832" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   evidence to supply to build a Given. So we can have a Wanted that arises</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="820" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="833" 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">

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;">   from Givens. These can be surprising for users. However, we still must</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="820" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="834" 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">

834

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<pre style="margin: 0;">+<span id="LC834" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   report (in contrast to Note [Given errors]): the (non-existent) evidence</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="820" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="835" 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">

835

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<pre style="margin: 0;">+<span id="LC835" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   might have been used to rewrite another Wanted. If we fail to report, then</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="820" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="836" 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">

836

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<pre style="margin: 0;">+<span id="LC836" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   we get an unfilled coercion hole. This happened in typecheck/should_fail/FD1.</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="837" 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">

837

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<pre style="margin: 0;">+<span id="LC837" class="line" lang="haskell"></span>

</pre>

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820

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<td class="diff-line-num new_line" data-linenumber="838" 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">

838

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<pre style="margin: 0;"> <span id="LC838" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Mechanism:</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="821" 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">

821

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<td class="diff-line-num new_line" data-linenumber="839" 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">

839

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<pre style="margin: 0;"> <span id="LC839" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="822" 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">

822

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<td class="diff-line-num new_line" data-linenumber="840" 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">

840

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<pre style="margin: 0;"> <span id="LC840" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We use the `suppress` function within reportWanteds to filter out these two</span></span>

</pre>

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</li>

<li id="f639b0b31b7245cb7d34ac190b798f5ec1c7da2e">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bb7b331e9627c637fc7ac5f7cdacacd5b9dfc665#f639b0b31b7245cb7d34ac190b798f5ec1c7da2e"><strong>compiler/GHC/Tc/Solver/Interact.hs</strong></a>

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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1820" 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">@@ -1820,7 +1820,7 @@ emitFunDepDeriveds work_rewriters fd_eqns</td>

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1820

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<pre style="margin: 0;"> <span id="LC1820" class="line" lang="haskell"></span>

</pre>

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1821

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<pre style="margin: 0;"> <span id="LC1821" class="line" lang="haskell"><span class="n" style="color: #333;">topReactionsStage</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">WorkItem</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>

</pre>

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<pre style="margin: 0;"> <span id="LC1822" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The work item does not react with the inert set,</span></span>

</pre>

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1823

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<td class="diff-line-num new_line old" data-linenumber="1823" 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="LC1823" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- so try interaction with top-level instances.<span class="idiff left right"> Note:</span></span></span>

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<pre style="margin: 0;">+<span id="LC1823" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- so try interaction with top-level instances.</span></span>

</pre>

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1824

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<pre style="margin: 0;"> <span id="LC1824" class="line" lang="haskell"><span class="n" style="color: #333;">topReactionsStage</span> <span class="n" style="color: #333;">work_item</span></span>

</pre>

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1825

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1825

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<pre style="margin: 0;"> <span id="LC1825" 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;">"doTopReact"</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>

</pre>

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1826

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1826

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<pre style="margin: 0;"> <span id="LC1826" class="line" lang="haskell">       <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">work_item</span> <span class="kr" style="font-weight: 600;">of</span></span>

</pre>

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<br>

</li>

<li id="3b6d78a50c8462304f843b952a88e531718dbbd2">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bb7b331e9627c637fc7ac5f7cdacacd5b9dfc665#3b6d78a50c8462304f843b952a88e531718dbbd2"><strong>compiler/GHC/Tc/Types/Constraint.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">@@ -56,7 +56,8 @@ module GHC.Tc.Types.Constraint (</td>

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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="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="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;">rewriterSetFromType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">rewriterSetFromTypes</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">rewriterSetFromCo</span><span class="p">,</span></span>

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<pre style="margin: 0;">+<span id="LC60" class="line" lang="haskell">        <span class="nf" style="color: #900; font-weight: 600;">addRewriterSet</span><span class="p">,</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC61" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC62" 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="LC63" class="line" lang="haskell"></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1551" 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="1552" 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">@@ -1551,18 +1552,31 @@ addRewriterSet = coerce (addOneToUniqSet @CoercionHole)</td>

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<pre style="margin: 0;"> <span id="LC1552" 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="LC1553" 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="LC1554" 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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<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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<pre style="margin: 0;">+<span id="LC1555" 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;">rewriter_set_from_co</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="n" style="color: #333;">emptyRewriterSet</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1558" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1556" 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">

1556

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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC1556" class="line" lang="haskell"></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1558" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1557" 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">

1557

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<pre style="margin: 0;">+<span id="LC1557" class="line" lang="haskell"><span class="cd">-- | Makes a 'RewriterSet' from all the coercion holes that occur in the</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1558" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1558" 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">

1558

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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC1558" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- given type.</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1558" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1559" 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">

1559

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<pre style="margin: 0;">+<span id="LC1559" class="line" lang="haskell"><span class="n" style="color: #333;">rewriterSetFromType</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;">RewriterSet</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1558" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1560" 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">

1560

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<pre style="margin: 0;">+<span id="LC1560" class="line" lang="haskell"><span class="n" style="color: #333;">rewriterSetFromType</span> <span class="n" style="color: #333;">ty</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;">rewriter_set_from_ty</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="n" style="color: #333;">emptyRewriterSet</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1558" 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">

1558

</td>

<td class="diff-line-num new_line" data-linenumber="1561" 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">

1561

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<pre style="margin: 0;"> <span id="LC1561" class="line" lang="haskell"></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1559" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1562" 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">

1562

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<pre style="margin: 0;">+<span id="LC1562" class="line" lang="haskell"><span class="cd">-- | Makes a 'RewriterSet' from all the coercion holes that occur in the</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1559" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1563" 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">

1563

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<pre style="margin: 0;">+<span id="LC1563" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- given types.</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1559" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1564" 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">

1564

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<pre style="margin: 0;">+<span id="LC1564" class="line" lang="haskell"><span class="n" style="color: #333;">rewriterSetFromTypes</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;">RewriterSet</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1559" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1565" 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">

1565

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<pre style="margin: 0;">+<span id="LC1565" class="line" lang="haskell"><span class="n" style="color: #333;">rewriterSetFromTypes</span> <span class="n" style="color: #333;">tys</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;">rewriter_set_from_tys</span> <span class="n" style="color: #333;">tys</span><span class="p">)</span> <span class="n" style="color: #333;">emptyRewriterSet</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1559" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1566" 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">

1566

</td>

<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC1566" class="line" lang="haskell"></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1559" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1567" 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">

1567

</td>

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<pre style="margin: 0;">+<span id="LC1567" class="line" lang="haskell"><span class="n" style="color: #333;">rewriter_set_from_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;">Endo</span> <span class="kt" style="color: #458; font-weight: 600;">RewriterSet</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1559" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1568" 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">

1568

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<pre style="margin: 0;">+<span id="LC1568" class="line" lang="haskell"><span class="n" style="color: #333;">rewriter_set_from_tys</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;">Endo</span> <span class="kt" style="color: #458; font-weight: 600;">RewriterSet</span></span>

</pre>

</td>

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<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="1559" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1569" 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">

1569

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<pre style="margin: 0;">+<span id="LC1569" class="line" lang="haskell"><span class="n" style="color: #333;">rewriter_set_from_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>

</pre>

</td>

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<tr class="line_holder new" id="" style="line-height: 1.6;">

<td class="diff-line-num new old_line" data-linenumber="1559" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1570" 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">

1570

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<pre style="margin: 0;">+<span id="LC1570" class="line" lang="haskell"><span class="p">(</span><span class="n" style="color: #333;">rewriter_set_from_ty</span><span class="p">,</span> <span class="n" style="color: #333;">rewriter_set_from_tys</span><span class="p">,</span> <span class="n" style="color: #333;">rewriter_set_from_co</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1559" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1571" 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">

1571

</td>

<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC1571" class="line" lang="haskell">  <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>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1559" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1572" 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">

1572

</td>

<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC1572" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="1559" 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">

1559

</td>

<td class="diff-line-num new_line" data-linenumber="1573" 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">

1573

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<pre style="margin: 0;"> <span id="LC1573" 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>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="1560" 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">

1560

</td>

<td class="diff-line-num new_line" data-linenumber="1574" 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">

1574

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<pre style="margin: 0;"> <span id="LC1574" 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>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="1561" 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">

1561

</td>

<td class="diff-line-num new_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">

1575

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<pre style="margin: 0;"> <span id="LC1575" 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>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1562" 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">

1562

</td>

<td class="diff-line-num new_line old" data-linenumber="1576" 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="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;"><span class="idiff left right">go</span>_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>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1563" 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">

1563

</td>

<td class="diff-line-num new_line old" data-linenumber="1576" 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="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;"><span class="idiff left right">go</span>_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>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1564" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1576" 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">

1576

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<pre style="margin: 0;">+<span id="LC1576" 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;"><span class="idiff left right">rewriter_set_from</span>_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>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1564" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1577" 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">

1577

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<pre style="margin: 0;">+<span id="LC1577" 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;"><span class="idiff left right">rewriter_set_from</span>_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>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1564" 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">

1564

</td>

<td class="diff-line-num new_line" data-linenumber="1578" 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">

1578

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<pre style="margin: 0;"> <span id="LC1578" 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>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1565" 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">

1565

</td>

<td class="diff-line-num new_line old" data-linenumber="1579" 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">

</td>

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<pre style="margin: 0;">-<span id="LC1565" class="line" lang="haskell">                                         <span class="n" style="color: #333;"><span class="idiff left right">go</span>_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>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1566" 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">

</td>

<td class="diff-line-num new new_line" data-linenumber="1579" 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">

1579

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<pre style="margin: 0;">+<span id="LC1579" class="line" lang="haskell">                                         <span class="n" style="color: #333;"><span class="idiff left right">rewriter_set_from</span>_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>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1566" 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">

1566

</td>

<td class="diff-line-num new_line" data-linenumber="1580" 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">

1580

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<pre style="margin: 0;"> <span id="LC1580" 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>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1567" 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">

1567

</td>

<td class="diff-line-num new_line" data-linenumber="1581" 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">

1581

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<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC1581" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1568" 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">

1568

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<td class="diff-line-num new_line" data-linenumber="1582" 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">

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>

</pre>

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<br>

</li>

<li id="94c96afe1bb3b771ffbcfeeca34ce43ebbe76ccb">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bb7b331e9627c637fc7ac5f7cdacacd5b9dfc665#94c96afe1bb3b771ffbcfeeca34ce43ebbe76ccb"><strong>compiler/GHC/Tc/Utils/TcMType.hs</strong></a>

<hr>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="258" 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="258" 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">@@ -258,7 +258,7 @@ emitWantedEq origin t_or_k role ty1 ty2</td>

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<td class="diff-line-num old_line" data-linenumber="258" 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="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>

</pre>

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259

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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="LC261" class="line" lang="haskell">                  <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;"><span class="idiff left right">emptyRewriterSet</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_rewriters</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left">rewriterSetFromTypes</span></span><span class="idiff"> </span><span class="p"><span class="idiff">[</span></span><span class="n" style="color: #333;"><span class="idiff">ty1</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty2</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="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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<br>

</li>

<li id="1f9de42e0bb78f1ddb90ed735ee9bb960f7ff55f">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bb7b331e9627c637fc7ac5f7cdacacd5b9dfc665#1f9de42e0bb78f1ddb90ed735ee9bb960f7ff55f"><strong>testsuite/tests/indexed-types/should_fail/ExplicitForAllFams4b.hs</strong></a>

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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="21" 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">@@ -21,7 +21,12 @@ class C a where</td>

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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="kr" style="font-weight: 600;">where</span></span>

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<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">CT</span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span><span class="n" style="color: #333;">a</span><span class="p">)</span>     <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Float</span></span>

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<pre style="margin: 0;">-<span id="LC24" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">b</span><span class="o" style="font-weight: 600;">.</span>   <span class="kt" style="color: #458; font-weight: 600;">CT</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;">Maybe</span> <span class="n" style="color: #333;">b</span></span>

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<td class="diff-line-num new_line old" data-linenumber="24" 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="LC25" class="line" lang="haskell"></span>

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<td class="diff-line-num old_line" data-linenumber="26" 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="24" 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="LC24" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">data</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">CD</span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span><span class="n" style="color: #333;">a</span><span class="p">)</span>     <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CD5</span> <span class="kt" style="color: #458; font-weight: 600;">Float</span></span>

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<td class="diff-line-num new new_line" data-linenumber="25" 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">

25

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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="27" 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="26" 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="LC26" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="kr" style="font-weight: 600;">where</span></span>

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<td class="diff-line-num new old_line" data-linenumber="27" 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="LC27" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">b</span><span class="o" style="font-weight: 600;">.</span>   <span class="kt" style="color: #458; font-weight: 600;">CT</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;">Maybe</span> <span class="n" style="color: #333;">b</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">data</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">b</span><span class="o" style="font-weight: 600;">.</span>   <span class="kt" style="color: #458; font-weight: 600;">CD</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;">CD6</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">b</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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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="kt" style="color: #458; font-weight: 600;">Double</span> <span class="kr" style="font-weight: 600;">where</span></span>

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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">b</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">CT</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;">Bool</span></span>

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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">data</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">b</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">CD</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;">CD7</span></span></pre>

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<br>

</li>

<li id="2fde7ac433f0aa93d0eb250c22f88389607cd467">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bb7b331e9627c637fc7ac5f7cdacacd5b9dfc665#2fde7ac433f0aa93d0eb250c22f88389607cd467"><strong>testsuite/tests/indexed-types/should_fail/ExplicitForAllFams4b.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">@@ -44,40 +44,38 @@ ExplicitForAllFams4b.hs:16:25: error:</td>

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<pre style="margin: 0;"> <span id="LC44" class="line" lang="plaintext">        but not bound on the LHS of the family instance</span>

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<pre style="margin: 0;"> <span id="LC45" class="line" lang="plaintext">    • In the newtype instance declaration for ‘L’</span>

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<pre style="margin: 0;"> <span id="LC46" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">-<span id="LC47" class="line" lang="plaintext">ExplicitForAllFams4b.hs:23:3: error:</span>

</pre>

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<pre style="margin: 0;">-<span id="LC48" class="line" lang="plaintext">    • Type indexes must match class instance head</span>

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<pre style="margin: 0;">-<span id="LC49" class="line" lang="plaintext">      Expected: CT Int _</span>

</pre>

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<pre style="margin: 0;">-<span id="LC50" class="line" lang="plaintext">        Actual: CT [a] (a, a)</span>

</pre>

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<pre style="margin: 0;">+<span id="LC47" class="line" lang="plaintext">ExplicitForAllFams4b.hs:23:20: error:</span>

</pre>

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<pre style="margin: 0;">+<span id="LC48" class="line" lang="plaintext">    • Couldn't match type ‘Int’ with ‘[a]’</span>

</pre>

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<pre style="margin: 0;">+<span id="LC49" class="line" lang="plaintext">        when matching a family LHS with its class instance head</span>

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<pre style="margin: 0;"> <span id="LC50" class="line" lang="plaintext">    • In the type instance declaration for ‘CT’</span>

</pre>

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<pre style="margin: 0;"> <span id="LC51" class="line" lang="plaintext">      In the instance declaration for ‘C Int’</span>

</pre>

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<pre style="margin: 0;"> <span id="LC52" class="line" lang="plaintext"></span>

</pre>

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<pre style="margin: 0;">-<span id="LC54" class="line" lang="plaintext">ExplicitForAllFams4b.hs:2<span class="idiff left right">3:17</span>: error:</span>

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<pre style="margin: 0;">-<span id="LC55" class="line" lang="plaintext">    • <span class="idiff left right">Type variable ‘b’ is bound by a forall,</span></span>

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<pre style="margin: 0;">-<span id="LC56" class="line" lang="plaintext">        <span class="idiff left right">but not used in the family instance</span></span>

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<pre style="margin: 0;">-<span id="LC57" class="line" lang="plaintext">    • In the <span class="idiff left right">type instance declaration for ‘CT</span>’</span>

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<pre style="margin: 0;">+<span id="LC53" class="line" lang="plaintext">ExplicitForAllFams4b.hs:2<span class="idiff left right">4:3</span>: error:</span>

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<pre style="margin: 0;">+<span id="LC54" class="line" lang="plaintext">    • <span class="idiff left right">Couldn't match type ‘Int’ with ‘[a]’</span></span>

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<pre style="margin: 0;">+<span id="LC55" class="line" lang="plaintext">        <span class="idiff left right">when matching a family LHS with its class instance head</span></span>

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<pre style="margin: 0;">+<span id="LC56" class="line" lang="plaintext">    • In the <span class="idiff left right">data instance declaration for ‘CD</span>’</span>

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<pre style="margin: 0;"> <span id="LC57" class="line" lang="plaintext">      In the instance declaration for ‘C Int’</span>

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<pre style="margin: 0;"> <span id="LC58" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">-<span id="LC60" class="line" lang="plaintext">ExplicitForAllFams4b.hs:2<span class="idiff left right">4</span>:15: error:</span>

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<pre style="margin: 0;">+<span id="LC59" class="line" lang="plaintext">ExplicitForAllFams4b.hs:2<span class="idiff left right">7</span>:15: error:</span>

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<pre style="margin: 0;"> <span id="LC60" class="line" lang="plaintext">    • Type variable ‘b’ is mentioned in the RHS,</span>

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<pre style="margin: 0;"> <span id="LC61" class="line" lang="plaintext">        but not bound on the LHS of the family instance</span>

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<pre style="margin: 0;"> <span id="LC62" class="line" lang="plaintext">    • In the type instance declaration for ‘CT’</span>

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<pre style="margin: 0;">-<span id="LC64" class="line" lang="plaintext">      In the instance declaration for ‘C Int’</span>

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<pre style="margin: 0;">-<span id="LC65" class="line" lang="plaintext"></span>

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<pre style="margin: 0;">-<span id="LC66" class="line" lang="plaintext">ExplicitForAllFams4b.hs:26:3: error:</span>

</pre>

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<pre style="margin: 0;">-<span id="LC67" class="line" lang="plaintext">    • Type indexes must match class instance head</span>

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<pre style="margin: 0;">-<span id="LC68" class="line" lang="plaintext">      Expected: CD Int _</span>

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<pre style="margin: 0;">-<span id="LC69" class="line" lang="plaintext">        Actual: CD [a] (a, a)</span>

</pre>

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<pre style="margin: 0;">-<span id="LC70" class="line" lang="plaintext">    • In the data instance declaration for ‘CD’</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="71" 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">

71

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<td class="diff-line-num new_line old" data-linenumber="63" 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="LC71" class="line" lang="plaintext">      In the instance declaration for ‘C Int’</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="72" 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="63" 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">

63

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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC63" class="line" lang="plaintext">      In the instance declaration for ‘C Bool’</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="72" 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">

72

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<td class="diff-line-num new_line" data-linenumber="64" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

64

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<pre style="margin: 0;"> <span id="LC64" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="73" 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">

73

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<td class="diff-line-num new_line old" data-linenumber="65" 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="LC73" class="line" lang="plaintext">ExplicitForAllFams4b.hs:2<span class="idiff left right">6:17</span>: error:</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="74" 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="65" 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">

65

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<pre style="margin: 0;">+<span id="LC65" class="line" lang="plaintext">ExplicitForAllFams4b.hs:2<span class="idiff left right">8:15</span>: error:</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="74" 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">

74

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<td class="diff-line-num new_line" data-linenumber="66" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

66

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<pre style="margin: 0;"> <span id="LC66" class="line" lang="plaintext">    • Type variable ‘b’ is mentioned in the RHS,</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="75" 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">

75

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<td class="diff-line-num new_line" data-linenumber="67" 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">

67

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<pre style="margin: 0;"> <span id="LC67" class="line" lang="plaintext">        but not bound on the LHS of the family instance</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="76" 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">

76

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<td class="diff-line-num new_line" data-linenumber="68" 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">

68

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<pre style="margin: 0;"> <span id="LC68" class="line" lang="plaintext">    • In the data instance declaration for ‘CD’</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="77" 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">

77

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<td class="diff-line-num new_line old" data-linenumber="69" 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="LC77" class="line" lang="plaintext">      In the instance declaration for ‘C <span class="idiff left right">Int</span>’</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="78" 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="69" 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">

69

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<pre style="margin: 0;">+<span id="LC69" class="line" lang="plaintext">      In the instance declaration for ‘C <span class="idiff left right">Bool</span>’</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="78" 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">

78

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<td class="diff-line-num new_line" data-linenumber="70" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

70

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<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC70" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="79" 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">

79

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<td class="diff-line-num new_line old" data-linenumber="71" 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="LC79" class="line" lang="plaintext">ExplicitForAllFams4b.hs:27:15: error:</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="80" 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="71" 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">

71

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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC71" class="line" lang="plaintext">ExplicitForAllFams4b.hs:31:15: error:</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="80" 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="72" 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">

72

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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC72" class="line" lang="plaintext">    • Type variable ‘b’ is bound by a forall,</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="80" 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="73" 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">

73

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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC73" class="line" lang="plaintext">        but not used in the family instance</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="80" 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="74" 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">

74

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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC74" class="line" lang="plaintext">    • In the type instance declaration for ‘CT’</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="80" 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="75" 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">

75

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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC75" class="line" lang="plaintext">      In the instance declaration for ‘C Double’</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="80" 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="76" 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">

76

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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC76" class="line" lang="plaintext"></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="80" 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="77" 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">

77

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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">

<pre style="margin: 0;">+<span id="LC77" class="line" lang="plaintext">ExplicitForAllFams4b.hs:32:15: error:</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="80" 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">

80

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<td class="diff-line-num new_line" data-linenumber="78" 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">

78

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<pre style="margin: 0;"> <span id="LC78" class="line" lang="plaintext">    • Type variable ‘b’ is mentioned in the RHS,</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="81" 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">

81

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<td class="diff-line-num new_line" data-linenumber="79" 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">

79

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<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">

<pre style="margin: 0;"> <span id="LC79" class="line" lang="plaintext">        but not bound on the LHS of the family instance</span>

</pre>

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82

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80

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<pre style="margin: 0;"> <span id="LC80" class="line" lang="plaintext">    • In the data instance declaration for ‘CD’</span>

</pre>

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83

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<pre style="margin: 0;">-<span id="LC83" class="line" lang="plaintext">      In the instance declaration for ‘C <span class="idiff left right">Int</span>’</span></pre>

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<pre style="margin: 0;">+<span id="LC81" class="line" lang="plaintext">      In the instance declaration for ‘C <span class="idiff left right">Double</span>’</span></pre>

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<br>

</li>

<li id="643cdd7f1c5109029bf84ca29e7eb9f8e6aef56f">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bb7b331e9627c637fc7ac5f7cdacacd5b9dfc665#643cdd7f1c5109029bf84ca29e7eb9f8e6aef56f"><strong>testsuite/tests/indexed-types/should_fail/SimpleFail2a.stderr</strong></a>

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1

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1

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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>

</pre>

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2

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2

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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">SimpleFail2a.hs:11:3: error:</span>

</pre>

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3

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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext">    • Type indexes must match class instance head</span>

</pre>

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4

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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext">      Expected: Sd Int</span>

</pre>

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5

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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext">        Actual: Sd a</span>

</pre>

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3

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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext">    • Couldn't match type ‘a’ with ‘Int’</span>

</pre>

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4

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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext">        when matching a family LHS with its class instance head</span>

</pre>

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6

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5

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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext">    • In the data instance declaration for ‘Sd’</span>

</pre>

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7

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6

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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext">      In the instance declaration for ‘C Int’</span></pre>

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8

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<pre style="margin: 0;">-<span id="LC8" class="line" lang="plaintext"></span>

</pre>

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9

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<pre style="margin: 0;">-<span id="LC9" class="line" lang="plaintext">SimpleFail2a.hs:11:11: error:</span>

</pre>

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10

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<pre style="margin: 0;">-<span id="LC10" class="line" lang="plaintext">    Conflicting family instance declarations:</span>

</pre>

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11

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<pre style="margin: 0;">-<span id="LC11" class="line" lang="plaintext">      Sd a -- Defined at SimpleFail2a.hs:11:11</span>

</pre>

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12

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<td class="diff-line-num new_line old" data-linenumber="7" 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="LC12" class="line" lang="plaintext">      Sd Int -- Defined at SimpleFail2a.hs:12:11</span></pre>

</td>

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<br>

</li>

<li id="dbbedd3ff17de84fe40d4974624d5d744d7a9c4c">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bb7b331e9627c637fc7ac5f7cdacacd5b9dfc665#dbbedd3ff17de84fe40d4974624d5d744d7a9c4c"><strong>testsuite/tests/indexed-types/should_fail/SimpleFail9.stderr</strong></a>

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1

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1

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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>

</pre>

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2

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2

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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">SimpleFail9.hs:16:3: error:</span>

</pre>

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3

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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext">    • Type indexes must match class instance head</span>

</pre>

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4

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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext">      Expected: S7 (a, Int)</span>

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5

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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext">        Actual: S7 (b, Int)</span>

</pre>

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3

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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext">    • Couldn't match type ‘a’ with ‘b’</span>

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4

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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext">        when matching a family LHS with its class instance head</span>

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6

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5

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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext">    • In the data instance declaration for ‘S7’</span>

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7

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6

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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext">      In the instance declaration for ‘C7 Char (a, Int)’</span></pre>

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<br>

</li>

<li id="0e6f1fde7dd2367324e045a317061cd856425cd3">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bb7b331e9627c637fc7ac5f7cdacacd5b9dfc665#0e6f1fde7dd2367324e045a317061cd856425cd3"><strong>testsuite/tests/typecheck/should_compile/FD1.stderr</strong>

deleted

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1

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<pre style="margin: 0;">-<span id="LC1" class="line" lang="plaintext"></span>

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2

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<pre style="margin: 0;">-<span id="LC2" class="line" lang="plaintext">FD1.hs:16:1: error:</span>

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3

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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext">    • Couldn't match expected type ‘a’ with actual type ‘Int -> Int’</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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5

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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext">        the type signature for:</span>

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6

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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext">          plus :: forall a. E a (Int -> Int) => Int -> a</span>

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<pre style="margin: 0;">-<span id="LC7" class="line" lang="plaintext">        at FD1.hs:15:1-38</span>

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<pre style="margin: 0;">-<span id="LC8" class="line" lang="plaintext">    • The equation(s) for ‘plus’ have two value arguments,</span>

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<pre style="margin: 0;">-<span id="LC9" class="line" lang="plaintext">        but its type ‘Int -> a’ has only one</span>

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<pre style="margin: 0;">-<span id="LC10" class="line" lang="plaintext">    • Relevant bindings include plus :: Int -> a (bound at FD1.hs:16:1)</span></pre>

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<br>

</li>

<li id="34fe7bf0e6fbf60effb28393399ba68666593909">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bb7b331e9627c637fc7ac5f7cdacacd5b9dfc665#34fe7bf0e6fbf60effb28393399ba68666593909"><strong>testsuite/tests/typecheck/should_compile/all.T</strong></a>

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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="260" 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">@@ -260,9 +260,6 @@ test('tc246', normal, compile, [''])</td>

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<pre style="margin: 0;"> <span id="LC260" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">tc247</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>

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<pre style="margin: 0;"> <span id="LC261" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">tc248</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>

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<pre style="margin: 0;"> <span id="LC262" class="line" lang="perl"></span>

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<pre style="margin: 0;">-<span id="LC263" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">FD1</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>

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<pre style="margin: 0;">-<span id="LC264" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">FD2</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC265" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">FD3</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC263" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">FD4</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>

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<pre style="margin: 0;"> <span id="LC264" class="line" lang="perl"></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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<pre style="margin: 0;"> <span id="LC265" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">faxen</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>

</pre>

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<br>

</li>

<li id="f72282051f998cf10c629b48eaa08cc0a6e3dd08">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bb7b331e9627c637fc7ac5f7cdacacd5b9dfc665#f72282051f998cf10c629b48eaa08cc0a6e3dd08"><strong>testsuite/tests/typecheck/should_compile/hole_constraints.stderr</strong></a>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="47" 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">@@ -47,8 +47,8 @@ hole_constraints.hs:16:35: warning: [-Wtyped-holes (in -Wdefault)]</td>

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<pre style="margin: 0;"> <span id="LC47" class="line" lang="plaintext">        mempty :: forall a. Monoid a => a</span>

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<pre style="margin: 0;"> <span id="LC48" class="line" lang="plaintext"></span>

</pre>

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<pre style="margin: 0;"> <span id="LC49" class="line" lang="plaintext">hole_constraints.hs:20:19: warning: [-Wtyped-holes (in -Wdefault)]</span>

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<pre style="margin: 0;">-<span id="LC50" class="line" lang="plaintext">    • Found hole: _ :: <span class="idiff left right">b</span></span>

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<pre style="margin: 0;">-<span id="LC51" class="line" lang="plaintext">      Where: ‘<span class="idiff left right">b</span>’ is a rigid type variable bound by</span>

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<pre style="margin: 0;">+<span id="LC50" class="line" lang="plaintext">    • Found hole: _ :: <span class="idiff left right">a</span></span>

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<pre style="margin: 0;">+<span id="LC51" class="line" lang="plaintext">      Where: ‘<span class="idiff left right">a</span>’ is a rigid type variable bound by</span>

</pre>

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<pre style="margin: 0;"> <span id="LC52" class="line" lang="plaintext">               the type signature for:</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="53" 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="LC53" class="line" lang="plaintext">                 castWith :: forall a b. (a :~: b) -> a -> b</span>

</pre>

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<pre style="margin: 0;"> <span id="LC54" class="line" lang="plaintext">               at hole_constraints.hs:19:1-29</span>

</pre>

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<br>

</li>

<li id="666f7d6000ff54754c94c22deb5616f72df2a658">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bb7b331e9627c637fc7ac5f7cdacacd5b9dfc665#666f7d6000ff54754c94c22deb5616f72df2a658"><strong>testsuite/tests/typecheck/should_compile/FD1.hs</strong>

→

<strong>testsuite/tests/typecheck/should_fail/FD1.hs</strong>

</a>

<hr>

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<br>

</li>

<li id="3ef98634a1bdeb088e72b4c97ff5d75a30ba8198">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bb7b331e9627c637fc7ac5f7cdacacd5b9dfc665#3ef98634a1bdeb088e72b4c97ff5d75a30ba8198"><strong>testsuite/tests/typecheck/should_fail/FD1.stderr</strong></a>

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1

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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">FD1.hs:15:9: error:</span>

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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext">    • Couldn't match type ‘a’ with ‘Int -> Int’</span>

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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext">        arising from a functional dependency between:</span>

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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext">          constraint ‘E a (Int -> Int)’</span>

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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext">            arising from the type signature for:</span>

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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext">                           plus :: forall a. E a (Int -> Int) => Int -> a</span>

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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext">          instance ‘E a1 a1’ at FD1.hs:13:10-14</span>

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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext">      ‘a’ is a rigid type variable bound by</span>

</pre>

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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext">        the type signature for:</span>

</pre>

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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext">          plus :: forall a. E a (Int -> Int) => Int -> a</span>

</pre>

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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext">        at FD1.hs:15:9-38</span>

</pre>

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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext">    • In the ambiguity check for ‘plus’</span>

</pre>

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<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext">      To defer the ambiguity check to use sites, enable AllowAmbiguousTypes</span>

</pre>

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<pre style="margin: 0;">+<span id="LC15" class="line" lang="plaintext">      In the type signature: plus :: (E a (Int -> Int)) => Int -> a</span></pre>

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<br>

</li>

<li id="e659fc9eb3ffe008ca14824a025aec80116818a6">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bb7b331e9627c637fc7ac5f7cdacacd5b9dfc665#e659fc9eb3ffe008ca14824a025aec80116818a6"><strong>testsuite/tests/typecheck/should_compile/FD2.hs</strong>

→

<strong>testsuite/tests/typecheck/should_fail/FD2.hs</strong>

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<br>

</li>

<li id="aa0069afd943eaf94dac358f5c78d93ab7c32a2e">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bb7b331e9627c637fc7ac5f7cdacacd5b9dfc665#aa0069afd943eaf94dac358f5c78d93ab7c32a2e"><strong>testsuite/tests/typecheck/should_compile/FD2.stderr</strong>

→

<strong>testsuite/tests/typecheck/should_fail/FD2.stderr</strong>

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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">FD2.hs:26:36: error:</span>

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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext">    • Couldn't match expected type ‘e’ with actual type ‘e1’</span>

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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">FD2.hs:24:12: error:</span>

</pre>

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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext">    • Couldn't match type ‘e1’ with ‘e’</span>

</pre>

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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext">        arising from a functional dependency between constraints:</span>

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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext">          ‘Elem a e1’</span>

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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext">            arising from the type signature for:</span>

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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext">                           mf :: forall e.</span>

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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext">                                 Elem a e =></span>

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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext">                                 e -> Maybe e -> Maybe e at FD2.hs:24:12-54</span>

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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext">          ‘Elem a e’</span>

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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext">            arising from the type signature for:</span>

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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext">                           foldr1 :: forall e.</span>

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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext">                                     Elem a e =></span>

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<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext">                                     (e -> e -> e) -> a -> e at FD2.hs:21:13-47</span>

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<pre style="margin: 0;"> <span id="LC15" class="line" lang="plaintext">      ‘e1’ is a rigid type variable bound by</span>

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<pre style="margin: 0;"> <span id="LC16" class="line" lang="plaintext">        the type signature for:</span>

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<pre style="margin: 0;"> <span id="LC17" class="line" lang="plaintext">          mf :: forall e1. Elem a e1 => e1 -> Maybe e1 -> Maybe e1</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">@@ -9,12 +20,13 @@ FD2.hs:26:36: error:</td>

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<pre style="margin: 0;"> <span id="LC20" class="line" lang="plaintext">        the type signature for:</span>

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<pre style="margin: 0;"> <span id="LC21" class="line" lang="plaintext">          foldr1 :: forall e. Elem a e => (e -> e -> e) -> a -> e</span>

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<pre style="margin: 0;"> <span id="LC22" class="line" lang="plaintext">        at FD2.hs:21:13-47</span>

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<pre style="margin: 0;">-<span id="LC12" class="line" lang="plaintext">    • In the first argument of ‘f’, namely ‘x’</span>

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<pre style="margin: 0;">-<span id="LC13" class="line" lang="plaintext">      In the first argument of ‘Just’, namely ‘(f x y)’</span>

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<pre style="margin: 0;">-<span id="LC14" class="line" lang="plaintext">      In the expression: Just (f x y)</span>

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<pre style="margin: 0;">+<span id="LC23" class="line" lang="plaintext">    • In an equation for ‘foldr1’:</span>

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<pre style="margin: 0;">+<span id="LC24" class="line" lang="plaintext">          foldr1 f xs</span>

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<pre style="margin: 0;">+<span id="LC25" class="line" lang="plaintext">            = fromMaybe (error "foldr1: empty structure") (foldr mf Nothing xs)</span>

</pre>

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<pre style="margin: 0;">+<span id="LC26" class="line" lang="plaintext">            where</span>

</pre>

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<pre style="margin: 0;">+<span id="LC27" class="line" lang="plaintext">                mf :: Elem a e => (e -> Maybe e -> Maybe e)</span>

</pre>

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<pre style="margin: 0;">+<span id="LC28" class="line" lang="plaintext">                mf x Nothing = Just x</span>

</pre>

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<pre style="margin: 0;">+<span id="LC29" class="line" lang="plaintext">                mf x (Just y) = Just (f x y)</span>

</pre>

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15

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<pre style="margin: 0;"> <span id="LC30" class="line" lang="plaintext">    • Relevant bindings include</span>

</pre>

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16

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<pre style="margin: 0;">-<span id="LC16" class="line" lang="plaintext">        y :: e1 (bound at FD2.hs:26:23)</span>

</pre>

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17

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<pre style="margin: 0;">-<span id="LC17" class="line" lang="plaintext">        x :: e1 (bound at FD2.hs:26:15)</span>

</pre>

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<pre style="margin: 0;">-<span id="LC18" class="line" lang="plaintext">        mf :: e1 -> Maybe e1 -> Maybe e1 (bound at FD2.hs:25:12)</span>

</pre>

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19

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<pre style="margin: 0;"> <span id="LC31" class="line" lang="plaintext">        f :: e -> e -> e (bound at FD2.hs:22:10)</span>

</pre>

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20

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<pre style="margin: 0;"> <span id="LC32" class="line" lang="plaintext">        foldr1 :: (e -> e -> e) -> a -> e (bound at FD2.hs:22:3)</span></pre>

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<br>

</li>

<li id="ad20f339e204ee2dba7eaae3efe1efdbaa9a3653">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bb7b331e9627c637fc7ac5f7cdacacd5b9dfc665#ad20f339e204ee2dba7eaae3efe1efdbaa9a3653"><strong>testsuite/tests/typecheck/should_compile/FD3.hs</strong>

→

<strong>testsuite/tests/typecheck/should_fail/FD3.hs</strong>

</a>

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<br>

</li>

<li id="2dd9f1533bf22f58b7b404994ccdf1fbe3668f61">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bb7b331e9627c637fc7ac5f7cdacacd5b9dfc665#2dd9f1533bf22f58b7b404994ccdf1fbe3668f61"><strong>testsuite/tests/typecheck/should_compile/FD3.stderr</strong>

→

<strong>testsuite/tests/typecheck/should_fail/FD3.stderr</strong>

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<li id="b9e86d897a62509b0114d81d5e736630d6f68f43">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bb7b331e9627c637fc7ac5f7cdacacd5b9dfc665#b9e86d897a62509b0114d81d5e736630d6f68f43"><strong>testsuite/tests/typecheck/should_fail/all.T</strong></a>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="564" 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">@@ -564,3 +564,6 @@ test('T17021b', normal, compile_fail, [''])</td>

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<pre style="margin: 0;"> <span id="LC564" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17955</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>

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<pre style="margin: 0;"> <span id="LC565" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17173</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC566" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">FunDepOrigin1b</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC567" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">FD1</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC568" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">FD2</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC569" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">FD3</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span></pre>

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