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<h3>

Simon Peyton Jones pushed to branch wip/T18412

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/3ecd7b82c4ac35723d09b5e0eaf6b62808805b6e">3ecd7b82</a></strong>

<div>

<span>by Simon Peyton Jones</span>

<i>at 2020-07-10T22:50:23+01:00</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Allow multiple case branches to have a higher rank type

As #18412 points out, it should be OK for multiple case alternatives

to have a higher rank type, provided they are all the same.

This patch implements that change.  It sweeps away

GHC.Tc.Gen.Match.tauifyMultipleBranches, and friends, replacing it

with an enhanced version of fillInferResult.

The basic change to fillInferResult is to permit the case in which

another case alternative has already filled in the result; and in

that case simply unify.  It's very simple actually.

See the new Note [fillInferResult].

</pre>

</li>

</ul>

<h4>14 changed files:</h4>

<ul>

<li class="file-stats">

<a href="#578c7c3857d66d963736ff6742f3433a0e8d01b7">

compiler/GHC/Core/TyCo/Rep.hs

</a>

</li>

<li class="file-stats">

<a href="#f157d5c316465070f94641e4c9ab0248311588cd">

compiler/GHC/Core/UsageEnv.hs

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</li>

<li class="file-stats">

<a href="#902811828741e6bcd64702935bbb54edbbd070ef">

compiler/GHC/Tc/Gen/Expr.hs

</a>

</li>

<li class="file-stats">

<a href="#3377164bfe9a1f1a8cfd588703ae1e0ea1e91cf9">

compiler/GHC/Tc/Gen/Match.hs

</a>

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<li class="file-stats">

<a href="#3ee8be814b6c6727880deab3772e6af922524bf0">

compiler/GHC/Tc/Gen/Pat.hs

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<li class="file-stats">

<a href="#59d42d45d27a766c3ef299d73c226697153b7f6e">

compiler/GHC/Tc/Utils/Instantiate.hs

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<li class="file-stats">

<a href="#94c96afe1bb3b771ffbcfeeca34ce43ebbe76ccb">

compiler/GHC/Tc/Utils/TcMType.hs

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<a href="#74295edeac870ee7f2f3484ebaffab5c948b735a">

compiler/GHC/Tc/Utils/Unify.hs

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<li class="file-stats">

<a href="#76b1e7dce1b4954525a28c2fed28ba31ca27a964">

testsuite/tests/simplCore/should_compile/T17901.stdout

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<li class="file-stats">

<a href="#32573c6529fd33f769071231b058ea20cd2d4b0d">

<span class="new-file">

+

testsuite/tests/typecheck/should_compile/T18412.hs

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<li class="file-stats">

<a href="#34fe7bf0e6fbf60effb28393399ba68666593909">

testsuite/tests/typecheck/should_compile/all.T

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<li class="file-stats">

<a href="#fb81f990ca209fe548e11dc52c6cf80c0bdf31a9">

testsuite/tests/typecheck/should_fail/T10619.stderr

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<a href="#d11758f93287e3d88c519d06faf4c1e867e35202">

testsuite/tests/typecheck/should_fail/tcfail002.stderr

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<li class="file-stats">

<a href="#f0e03fefede81fd3a2760698eb1cbcfd7415f58d">

testsuite/tests/typecheck/should_fail/tcfail104.stderr

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</li>

</ul>

<h4>Changes:</h4>

<li id="578c7c3857d66d963736ff6742f3433a0e8d01b7">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3ecd7b82c4ac35723d09b5e0eaf6b62808805b6e#578c7c3857d66d963736ff6742f3433a0e8d01b7"><strong>compiler/GHC/Core/TyCo/Rep.hs</strong></a>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="19" 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">@@ -19,7 +19,8 @@ Note [The Type-related module hierarchy]</td>

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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We expose the relevant stuff from this module via the Type module</span></span>

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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# OPTIONS_HADDOCK not-home #-}</span></span>

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<pre style="margin: 0;">-<span id="LC22" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE CPP, DeriveDataTypeable, MultiWayIf, PatternSynonyms, BangPatterns #-}</span></span>

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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE CPP, MultiWayIf, PatternSynonyms, BangPatterns #-}</span></span>

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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE DeriveDataTypeable #-}</span></span>

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<pre style="margin: 0;"> <span id="LC24" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.Core.TyCo.Rep</span> <span class="p">(</span></span>

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<pre style="margin: 0;"> <span id="LC26" class="line" lang="haskell">        <span class="kt" style="color: #458; font-weight: 600;">TyThing</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;">tyThingCategory</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pprTyThingCategory</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pprShortTyThing</span><span class="p">,</span></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2025" 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="2026" 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">@@ -2025,6 +2026,12 @@ GHC.Core.Multiplicity above this module.</td>

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<pre style="margin: 0;"> <span id="LC2026" class="line" lang="haskell"><span class="cd">-- | A shorthand for data with an attached 'Mult' element (the multiplicity).</span></span>

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<pre style="margin: 0;"> <span id="LC2027" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Scaled</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Scaled</span> <span class="kt" style="color: #458; font-weight: 600;">Mult</span> <span class="n" style="color: #333;">a</span></span>

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<pre style="margin: 0;"> <span id="LC2028" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">deriving</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Data</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Data</span><span class="p">)</span></span>

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<pre style="margin: 0;">+<span id="LC2029" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- You might think that this would be a natural candiate for</span></span>

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<td class="diff-line-num new old_line" data-linenumber="2028" 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="2030" 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">

2030

</td>

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<pre style="margin: 0;">+<span id="LC2030" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- Functor, Traversable but Krzysztof says (!3674) "it was too easy</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="2028" 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="2031" 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">

2031

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<pre style="margin: 0;">+<span id="LC2031" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- to accidentally lift functions (substitutions, zonking etc.) from</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="2028" 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="2032" 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">

2032

</td>

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<pre style="margin: 0;">+<span id="LC2032" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- Type -> Type to Scaled Type -> Scaled Type, ignoring</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="2028" 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="2033" 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">

2033

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<pre style="margin: 0;">+<span id="LC2033" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- multiplicities and causing bugs".  So we don't.</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="2028" 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="2034" 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">

2034

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<pre style="margin: 0;">+<span id="LC2034" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="2028" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

2028

</td>

<td class="diff-line-num new_line" data-linenumber="2035" 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">

2035

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<pre style="margin: 0;"> <span id="LC2035" class="line" lang="haskell"></span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="2029" 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">

2029

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<td class="diff-line-num new_line" data-linenumber="2036" 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">

2036

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<pre style="margin: 0;"> <span id="LC2036" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Outputable</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;">Outputable</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Scaled</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

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2030

</td>

<td class="diff-line-num new_line" data-linenumber="2037" 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">

2037

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<pre style="margin: 0;"> <span id="LC2037" class="line" lang="haskell">   <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Scaled</span> <span class="n" style="color: #333;">_cnt</span> <span class="n" style="color: #333;">t</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">t</span></span>

</pre>

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<br>

</li>

<li id="f157d5c316465070f94641e4c9ab0248311588cd">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3ecd7b82c4ac35723d09b5e0eaf6b62808805b6e#f157d5c316465070f94641e4c9ab0248311588cd"><strong>compiler/GHC/Core/UsageEnv.hs</strong></a>

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<td class="diff-line-num old_line" data-linenumber="1" 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">

1

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<td class="diff-line-num new_line" data-linenumber="1" 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">

1

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<pre style="margin: 0;"> <span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE ViewPatterns #-}</span></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="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.Core.UsageEnv</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UsageEnv</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">addUsage</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">scaleUsage</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">zeroUE</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="3" 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">

3

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<td class="diff-line-num new_line" data-linenumber="3" 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">

3

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<pre style="margin: 0;"> <span id="LC3" class="line" lang="haskell">                          <span class="nf" style="color: #900; font-weight: 600;">lookupUE</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">scaleUE</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">deleteUE</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">addUE</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Usage</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;">unitUE</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="4" 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">

4

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<td class="diff-line-num new_line old" data-linenumber="4" 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="LC4" class="line" lang="haskell">                          <span class="nf" style="color: #900; font-weight: 600;">supUE</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">supUEs</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="5" 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="4" 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">

4

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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell">                          <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left">bottomUE</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff right"> </span><span class="nf" style="color: #900; font-weight: 600;">supUE</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">supUEs</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="5" 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">

5

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<td class="diff-line-num new_line" data-linenumber="5" 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">

5

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<pre style="margin: 0;"> <span id="LC5" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="6" 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">

6

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<td class="diff-line-num new_line" data-linenumber="6" 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">

6

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<pre style="margin: 0;"> <span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Foldable</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="7" 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">

7

</td>

<td class="diff-line-num new_line" data-linenumber="7" 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">

7

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<pre style="margin: 0;"> <span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Prelude</span></span>

</pre>

</td>

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</table>

<br>

</li>

<li id="902811828741e6bcd64702935bbb54edbbd070ef">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3ecd7b82c4ac35723d09b5e0eaf6b62808805b6e#902811828741e6bcd64702935bbb54edbbd070ef"><strong>compiler/GHC/Tc/Gen/Expr.hs</strong></a>

<hr>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="591" 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="591" 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">@@ -591,10 +591,6 @@ tcExpr (HsCase x scrut matches) res_ty</td>

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591

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591

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<pre style="margin: 0;"> <span id="LC591" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="592" 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="LC592" class="line" lang="haskell"><span class="n" style="color: #333;">tcExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsIf</span> <span class="n" style="color: #333;">x</span> <span class="kt" style="color: #458; font-weight: 600;">NoSyntaxExprRn</span> <span class="n" style="color: #333;">pred</span> <span class="n" style="color: #333;">b1</span> <span class="n" style="color: #333;">b2</span><span class="p">)</span> <span class="n" style="color: #333;">res_ty</span>    <span class="c1" style="color: #998; font-style: italic;">-- Ordinary 'if'</span></span>

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<td class="diff-line-num old_line" data-linenumber="593" 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">

593

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<pre style="margin: 0;"> <span id="LC593" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">pred'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcLExpr</span> <span class="n" style="color: #333;">pred</span> <span class="p">(</span><span class="n" style="color: #333;">mkCheckExpType</span> <span class="n" style="color: #333;">boolTy</span><span class="p">)</span></span>

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594

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<td class="diff-line-num new_line old" data-linenumber="594" 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="LC594" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">res_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tauifyExpType</span> <span class="n" style="color: #333;">res_ty</span></span>

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595

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<td class="diff-line-num new_line old" data-linenumber="594" 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="LC595" class="line" lang="haskell">           <span class="c1" style="color: #998; font-style: italic;">-- Just like Note [Case branches must never infer a non-tau type]</span></span>

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<pre style="margin: 0;">-<span id="LC596" class="line" lang="haskell">           <span class="c1" style="color: #998; font-style: italic;">-- in GHC.Tc.Gen.Match (See #10619)</span></span>

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<pre style="margin: 0;">-<span id="LC597" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;"> <span id="LC594" class="line" lang="haskell">       <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">u1</span><span class="p">,</span><span class="n" style="color: #333;">b1'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcCollectingUsage</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tcLExpr</span> <span class="n" style="color: #333;">b1</span> <span class="n" style="color: #333;">res_ty</span></span>

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<pre style="margin: 0;"> <span id="LC595" class="line" lang="haskell">       <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">u2</span><span class="p">,</span><span class="n" style="color: #333;">b2'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcCollectingUsage</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tcLExpr</span> <span class="n" style="color: #333;">b2</span> <span class="n" style="color: #333;">res_ty</span></span>

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<pre style="margin: 0;"> <span id="LC596" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">tcEmitBindingUsage</span> <span class="p">(</span><span class="n" style="color: #333;">supUE</span> <span class="n" style="color: #333;">u1</span> <span class="n" style="color: #333;">u2</span><span class="p">)</span></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="611" 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="607" 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">@@ -611,13 +607,7 @@ tcExpr (HsIf x fun@(SyntaxExprRn {}) pred b1 b2) res_ty</td>

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<pre style="margin: 0;"> <span id="LC607" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsIf</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">fun'</span> <span class="n" style="color: #333;">pred'</span> <span class="n" style="color: #333;">b1'</span> <span class="n" style="color: #333;">b2'</span><span class="p">)</span> <span class="p">}</span></span>

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<pre style="margin: 0;"> <span id="LC608" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC609" class="line" lang="haskell"><span class="n" style="color: #333;">tcExpr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsMultiIf</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">alts</span><span class="p">)</span> <span class="n" style="color: #333;">res_ty</span></span>

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<pre style="margin: 0;">-<span id="LC614" 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;">res_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">isSingleton</span> <span class="n" style="color: #333;">alts</span></span>

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<td class="diff-line-num new_line old" data-linenumber="610" 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="LC615" class="line" lang="haskell">                   <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">res_ty</span></span>

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<td class="diff-line-num new_line old" data-linenumber="610" 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="LC616" class="line" lang="haskell">                   <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">tauifyExpType</span> <span class="n" style="color: #333;">res_ty</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="617" 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">

617

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<pre style="margin: 0;">-<span id="LC617" class="line" lang="haskell">             <span class="c1" style="color: #998; font-style: italic;">-- Just like GHC.Tc.Gen.Match</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="618" 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">

618

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<pre style="margin: 0;">-<span id="LC618" class="line" lang="haskell">             <span class="c1" style="color: #998; font-style: italic;">-- Note [Case branches must never infer a non-tau type]</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="619" 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">

619

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<td class="diff-line-num new_line old" data-linenumber="610" 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="LC619" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="620" 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">

620

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<pre style="margin: 0;">-<span id="LC620" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">alts'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">wrapLocM</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tcGRHS</span> <span class="n" style="color: #333;">match_ctxt</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span> <span class="n" style="color: #333;">alts</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="621" 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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610

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<pre style="margin: 0;">+<span id="LC610" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">alts'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">wrapLocM</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">tcGRHS</span> <span class="n" style="color: #333;">match_ctxt</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span> <span class="n" style="color: #333;">alts</span></span>

</pre>

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611

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<pre style="margin: 0;"> <span id="LC611" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">res_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">readExpType</span> <span class="n" style="color: #333;">res_ty</span></span>

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<td class="diff-line-num old_line" data-linenumber="622" 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">

622

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<td class="diff-line-num new_line" data-linenumber="612" 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">

612

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<pre style="margin: 0;"> <span id="LC612" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsMultiIf</span> <span class="n" style="color: #333;">res_ty</span> <span class="n" style="color: #333;">alts'</span><span class="p">)</span> <span class="p">}</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="623" 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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613

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<pre style="margin: 0;"> <span id="LC613" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">match_ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MC</span> <span class="p">{</span> <span class="n" style="color: #333;">mc_what</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">IfAlt</span><span class="p">,</span> <span class="n" style="color: #333;">mc_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcBody</span> <span class="p">}</span></span>

</pre>

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<br>

</li>

<li id="3377164bfe9a1f1a8cfd588703ae1e0ea1e91cf9">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3ecd7b82c4ac35723d09b5e0eaf6b62808805b6e#3377164bfe9a1f1a8cfd588703ae1e0ea1e91cf9"><strong>compiler/GHC/Tc/Gen/Match.hs</strong></a>

<hr>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="164" 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="164" 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">@@ -164,80 +164,47 @@ tcGRHSsPat grhss res_ty = tcGRHSs match_ctxt grhss (mkCheckExpType res_ty)</td>

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164

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<pre style="margin: 0;"> <span id="LC164" class="line" lang="haskell">    <span class="n" style="color: #333;">match_ctxt</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MC</span> <span class="p">{</span> <span class="n" style="color: #333;">mc_what</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PatBindRhs</span><span class="p">,</span></span>

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165

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<pre style="margin: 0;"> <span id="LC165" class="line" lang="haskell">                      <span class="n" style="color: #333;">mc_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcBody</span> <span class="p">}</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC166" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="167" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="167" 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="LC167" 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 old old_line" data-linenumber="168" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="167" 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="LC168" 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 old_line" data-linenumber="169" 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="167" 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="LC167" 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 old_line" data-linenumber="169" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

169

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<pre style="margin: 0;"> <span id="LC168" 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 old old_line" data-linenumber="170" 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">

170

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<td class="diff-line-num new_line old" data-linenumber="169" 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="LC170" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">\subsection{tcMatch}</span></span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="171" 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="169" 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="LC169" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">                tcMatch</span></span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="171" 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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170

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<pre style="margin: 0;"> <span id="LC170" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">*                                                                      *</span></span>

</pre>

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172

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<pre style="margin: 0;">-<span id="LC172" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>

</pre>

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173

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<pre style="margin: 0;">-<span id="LC173" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="174" 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">

174

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<pre style="margin: 0;">-<span id="LC174" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Case branches must never infer a non-tau type]</span></span>

</pre>

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175

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<pre style="margin: 0;">-<span id="LC175" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>

</pre>

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176

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<pre style="margin: 0;">-<span id="LC176" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider</span></span>

</pre>

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177

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<pre style="margin: 0;">-<span id="LC177" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">-<span id="LC178" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  case ... of</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC179" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">    ... -> \(x :: forall a. a -> a) -> x</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC180" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">    ... -> \y -> y</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="181" 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">

181

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<pre style="margin: 0;">-<span id="LC181" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="182" 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">

182

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<pre style="margin: 0;">-<span id="LC182" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Should that type-check? The problem is that, if we check the second branch</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC183" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">first, then we'll get a type (b -> b) for the branches, which won't unify</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC184" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with the polytype in the first branch. If we check the first branch first,</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="185" 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="LC185" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">then everything is OK. This order-dependency is terrible. So we want only</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="186" 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="LC186" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">proper tau-types in branches (unless a sigma-type is pushed down).</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="187" 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="LC187" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This is what expTypeToType ensures: it replaces an Infer with a fresh</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC188" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">tau-type.</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="189" 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="LC189" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="190" 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">

190

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<pre style="margin: 0;">-<span id="LC190" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">An even trickier case looks like</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="191" 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="LC191" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">-<span id="LC192" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  f x True  = x undefined</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC193" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  f x False = x ()</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC194" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">-<span id="LC195" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here, we see that the arguments must also be non-Infer. Thus, we must</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC196" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">use expTypeToType on the output of matchExpectedFunTys, not the input.</span></span>

</pre>

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197

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<pre style="margin: 0;">-<span id="LC197" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">-<span id="LC198" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But we make a special case for a one-branch case. This is so that</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC199" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">-<span id="LC200" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  f = \(x :: forall a. a -> a) -> x</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC201" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="202" 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="LC202" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">still gets assigned a polytype.</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC203" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC171" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">********************************************************************* -}</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC172" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">-<span id="LC205" class="line" lang="haskell"><span class="cd">-- | When the MatchGroup has multiple RHSs, convert an Infer ExpType in the</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC206" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- expected type into TauTvs.</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="207" 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="LC207" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Case branches must never infer a non-tau type]</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="208" 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="LC208" class="line" lang="haskell"><span class="n" style="color: #333;">tauifyMultipleMatches</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LMatch</span> <span class="n" style="color: #333;">id</span> <span class="n" style="color: #333;">body</span><span class="p">]</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC209" class="line" lang="haskell">                      <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Scaled</span> <span class="kt" style="color: #458; font-weight: 600;">ExpType</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Scaled</span> <span class="kt" style="color: #458; font-weight: 600;">ExpType</span><span class="p">]</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="210" 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="LC210" class="line" lang="haskell"><span class="n" style="color: #333;">tauifyMultipleMatches</span> <span class="n" style="color: #333;">group</span> <span class="n" style="color: #333;">exp_tys</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC211" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isSingletonMatchGroup</span> <span class="n" style="color: #333;">group</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">exp_tys</span></span>

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<pre style="margin: 0;">-<span id="LC212" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span>                   <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Scaled</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">t</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC213" class="line" lang="haskell">                                       <span class="n" style="color: #333;">fmap</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Scaled</span> <span class="n" style="color: #333;">m</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">tauifyExpType</span> <span class="n" style="color: #333;">t</span><span class="p">))</span> <span class="n" style="color: #333;">exp_tys</span></span>

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<pre style="margin: 0;">-<span id="LC214" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- NB: In the empty-match case, this ensures we fill in the ExpType</span></span>

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<pre style="margin: 0;">+<span id="LC173" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">TcMatchCtxt</span> <span class="n" style="color: #333;">body</span>   <span class="c1" style="color: #998; font-style: italic;">-- c.f. TcStmtCtxt, also in this module</span></span>

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<pre style="margin: 0;">+<span id="LC174" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MC</span> <span class="p">{</span> <span class="n" style="color: #333;">mc_what</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsMatchContext</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">,</span>  <span class="c1" style="color: #998; font-style: italic;">-- What kind of thing this is</span></span>

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<td class="diff-line-num new old_line" data-linenumber="215" 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="175" 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="LC175" class="line" lang="haskell">         <span class="n" style="color: #333;">mc_body</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="p">(</span><span class="n" style="color: #333;">body</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">)</span>   <span class="c1" style="color: #998; font-style: italic;">-- Type checker for a body of</span></span>

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<pre style="margin: 0;">+<span id="LC176" class="line" lang="haskell">                                           <span class="c1" style="color: #998; font-style: italic;">-- an alternative</span></span>

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<pre style="margin: 0;">+<span id="LC177" class="line" lang="haskell">                 <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ExpRhoType</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC178" class="line" lang="haskell">                 <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="p">(</span><span class="n" style="color: #333;">body</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">))</span> <span class="p">}</span></span>

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<pre style="margin: 0;"> <span id="LC179" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;"> <span id="LC180" class="line" lang="haskell"><span class="cd">-- | Type-check a MatchGroup.</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC181" class="line" lang="haskell"><span class="n" style="color: #333;">tcMatches</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="p">(</span><span class="n" style="color: #333;">body</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">TcMatchCtxt</span> <span class="n" style="color: #333;">body</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC182" class="line" lang="haskell">          <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Scaled</span> <span class="kt" style="color: #458; font-weight: 600;">ExpSigmaType</span><span class="p">]</span>      <span class="c1" style="color: #998; font-style: italic;">-- Expected pattern types</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC219" class="line" lang="haskell">          <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ExpRhoType</span>          <span class="c1" style="color: #998; font-style: italic;">-- Expected result-type of the Match.</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="220" 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="183" 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="LC183" class="line" lang="haskell">          <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ExpRhoType</span>          <span class="idiff left right">       </span><span class="c1" style="color: #998; font-style: italic;">-- Expected result-type of the Match.</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC184" class="line" lang="haskell">          <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MatchGroup</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="p">(</span><span class="n" style="color: #333;">body</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">))</span></span>

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<pre style="margin: 0;"> <span id="LC185" class="line" lang="haskell">          <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MatchGroup</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="p">(</span><span class="n" style="color: #333;">body</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">)))</span></span>

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<pre style="margin: 0;"> <span id="LC186" class="line" lang="haskell"></span>

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<pre style="margin: 0;">-<span id="LC223" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">TcMatchCtxt</span> <span class="n" style="color: #333;">body</span>   <span class="c1" style="color: #998; font-style: italic;">-- c.f. TcStmtCtxt, also in this module</span></span>

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<pre style="margin: 0;">-<span id="LC224" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MC</span> <span class="p">{</span> <span class="n" style="color: #333;">mc_what</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HsMatchContext</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">,</span>  <span class="c1" style="color: #998; font-style: italic;">-- What kind of thing this is</span></span>

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<pre style="margin: 0;">-<span id="LC225" class="line" lang="haskell">         <span class="n" style="color: #333;">mc_body</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="p">(</span><span class="n" style="color: #333;">body</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">)</span>         <span class="c1" style="color: #998; font-style: italic;">-- Type checker for a body of</span></span>

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<pre style="margin: 0;">-<span id="LC226" class="line" lang="haskell">                                                <span class="c1" style="color: #998; font-style: italic;">-- an alternative</span></span>

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<pre style="margin: 0;">-<span id="LC227" class="line" lang="haskell">                 <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ExpRhoType</span></span>

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<pre style="margin: 0;">-<span id="LC228" class="line" lang="haskell">                 <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="p">(</span><span class="n" style="color: #333;">body</span> <span class="kt" style="color: #458; font-weight: 600;">GhcTc</span><span class="p">))</span> <span class="p">}</span></span>

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<pre style="margin: 0;"> <span id="LC187" class="line" lang="haskell"><span class="n" style="color: #333;">tcMatches</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">pat_tys</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MG</span> <span class="p">{</span> <span class="n" style="color: #333;">mg_alts</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">l</span> <span class="n" style="color: #333;">matches</span></span>

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<pre style="margin: 0;"> <span id="LC188" class="line" lang="haskell">                                  <span class="p">,</span> <span class="n" style="color: #333;">mg_origin</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">origin</span> <span class="p">})</span></span>

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<pre style="margin: 0;">-<span id="LC231" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Scaled</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">rhs_ty</span><span class="p">)</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">pat_tys</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tauifyMultipleMatches</span> <span class="n" style="color: #333;">matches</span> <span class="p">((</span><span class="kt" style="color: #458; font-weight: 600;">Scaled</span> <span class="kt" style="color: #458; font-weight: 600;">One</span> <span class="n" style="color: #333;">rhs_ty</span><span class="p">)</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">pat_tys</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- return type has implicitly multiplicity 1, it doesn't matter all that much in this case since it isn't used and is eliminated immediately.</span></span>

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<pre style="margin: 0;">-<span id="LC232" class="line" lang="haskell">            <span class="c1" style="color: #998; font-style: italic;">-- See Note [Case branches must never infer a non-tau type]</span></span>

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<pre style="margin: 0;">+<span id="LC189" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">matches</span>  <span class="c1" style="color: #998; font-style: italic;">-- Deal with case e of {}</span></span>

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<td class="diff-line-num new old_line" data-linenumber="233" 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="LC190" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- Since there are no branches, no one else will fill in rhs_ty</span></span>

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<pre style="margin: 0;">+<span id="LC191" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- when in inference mode, so we must do it ourselves,</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC192" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- here, using expTypeToType</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="193" 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="LC193" 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;">tcEmitBindingUsage</span> <span class="n" style="color: #333;">bottomUE</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="233" 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="194" 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="LC194" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">pat_tys</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">scaledExpTypeToType</span> <span class="n" style="color: #333;">pat_tys</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="195" 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="LC195" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">rhs_ty</span>  <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">expTypeToType</span> <span class="n" style="color: #333;">rhs_ty</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="196" 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="LC196" 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;">MG</span> <span class="p">{</span> <span class="n" style="color: #333;">mg_alts</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">l</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="233" 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="197" 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="LC197" class="line" lang="haskell">                    <span class="p">,</span> <span class="n" style="color: #333;">mg_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MatchGroupTc</span> <span class="n" style="color: #333;">pat_tys</span> <span class="n" style="color: #333;">rhs_ty</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC198" class="line" lang="haskell">                    <span class="p">,</span> <span class="n" style="color: #333;">mg_origin</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">origin</span> <span class="p">})</span> <span class="p">}</span></span>

</pre>

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199

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<pre style="margin: 0;"> <span id="LC199" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">-<span id="LC234" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">umatches</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">tcCollectingUsage</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">tcMatch</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">pat_tys</span> <span class="n" style="color: #333;">rhs_ty</span><span class="p">)</span> <span class="n" style="color: #333;">matches</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC200" 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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<pre style="margin: 0;">+<span id="LC201" 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;">umatches</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="p">(</span><span class="n" style="color: #333;">tcCollectingUsage</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">tcMatch</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">pat_tys</span> <span class="n" style="color: #333;">rhs_ty</span><span class="p">)</span> <span class="n" style="color: #333;">matches</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC202" class="line" lang="haskell">       <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">usages</span><span class="p">,</span><span class="n" style="color: #333;">matches'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">unzip</span> <span class="n" style="color: #333;">umatches</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC203" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">tcEmitBindingUsage</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">supUEs</span> <span class="n" style="color: #333;">usages</span></span>

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<pre style="margin: 0;">-<span id="LC237" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">pat_tys</span>  <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="p"><span class="idiff left">(</span></span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">\</span></span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Scaled</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">m</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">t</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">fmap</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Scaled</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">m</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">readExpType</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">t</span></span><span class="p"><span class="idiff right">))</span></span> <span class="n" style="color: #333;">pat_tys</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="204" 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="LC204" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">pat_tys</span>  <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;"><span class="idiff left right">readScaledExpType</span></span> <span class="n" style="color: #333;">pat_tys</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC205" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">rhs_ty</span>   <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">readExpType</span> <span class="n" style="color: #333;">rhs_ty</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC239" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MG</span> <span class="p">{</span> <span class="n" style="color: #333;">mg_alts</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">l</span> <span class="n" style="color: #333;">matches'</span></span>

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<pre style="margin: 0;">-<span id="LC240" class="line" lang="haskell">                    <span class="p">,</span> <span class="n" style="color: #333;">mg_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MatchGroupTc</span> <span class="n" style="color: #333;">pat_tys</span> <span class="n" style="color: #333;">rhs_ty</span></span>

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<pre style="margin: 0;">+<span id="LC206" 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;">MG</span> <span class="p">{</span> <span class="n" style="color: #333;">mg_alts</span> <span class="idiff left right">  </span><span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">l</span> <span class="n" style="color: #333;">matches'</span></span>

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<pre style="margin: 0;">+<span id="LC207" class="line" lang="haskell">                    <span class="p">,</span> <span class="n" style="color: #333;">mg_ext</span> <span class="idiff left right">   </span><span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MatchGroupTc</span> <span class="n" style="color: #333;">pat_tys</span> <span class="n" style="color: #333;">rhs_ty</span></span>

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<pre style="margin: 0;"> <span id="LC208" class="line" lang="haskell">                    <span class="p">,</span> <span class="n" style="color: #333;">mg_origin</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">origin</span> <span class="p">})</span> <span class="p">}</span></span>

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<pre style="margin: 0;"> <span id="LC209" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC210" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-------------</span></span>

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<br>

</li>

<li id="3ee8be814b6c6727880deab3772e6af922524bf0">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3ecd7b82c4ac35723d09b5e0eaf6b62808805b6e#3ee8be814b6c6727880deab3772e6af922524bf0"><strong>compiler/GHC/Tc/Gen/Pat.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">@@ -629,10 +629,9 @@ There are two bits of rebindable syntax:</td>

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<pre style="margin: 0;"> <span id="LC629" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">lit1_ty and lit2_ty could conceivably be different.</span></span>

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<pre style="margin: 0;"> <span id="LC630" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">var_ty is the type inferred for x, the variable in the pattern.</span></span>

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<pre style="margin: 0;"> <span id="LC631" class="line" lang="haskell"></span>

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<pre style="margin: 0;">-<span id="LC632" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If the pushed-down pattern type isn't a tau-type, the two pat_ty's above</span></span>

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<pre style="margin: 0;">-<span id="LC633" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">could conceivably be different specializations. But this is very much</span></span>

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<pre style="margin: 0;">-<span id="LC634" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">like the situation in Note [Case branches must be taus] in GHC.Tc.Gen.Match.</span></span>

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<pre style="margin: 0;">-<span id="LC635" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So we tauify the pat_ty before proceeding.</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC632" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If the pushed-down pattern type isn't a tau-type, the two pat_ty's</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC633" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">above could conceivably be different specializations.  So we use</span></span>

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<pre style="margin: 0;">+<span id="LC634" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">expTypeToType on pat_ty before proceeding.</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC635" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="637" 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">

637

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<pre style="margin: 0;"> <span id="LC636" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that we need to type-check the literal twice, because it is used</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="638" 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="637" 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="LC637" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">twice, and may be used at different types. The second HsOverLit stored in the</span></span>

</pre>

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</li>

<li id="59d42d45d27a766c3ef299d73c226697153b7f6e">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3ecd7b82c4ac35723d09b5e0eaf6b62808805b6e#59d42d45d27a766c3ef299d73c226697153b7f6e"><strong>compiler/GHC/Tc/Utils/Instantiate.hs</strong></a>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="474" 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="474" 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">@@ -474,8 +474,6 @@ newOverloadedLit :: HsOverLit GhcRn</td>

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474

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<pre style="margin: 0;"> <span id="LC474" class="line" lang="haskell"><span class="n" style="color: #333;">newOverloadedLit</span></span>

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<pre style="margin: 0;"> <span id="LC475" class="line" lang="haskell">  <span class="n" style="color: #333;">lit</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">OverLit</span> <span class="p">{</span> <span class="n" style="color: #333;">ol_val</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">val</span><span class="p">,</span> <span class="n" style="color: #333;">ol_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rebindable</span> <span class="p">})</span> <span class="n" style="color: #333;">res_ty</span></span>

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<pre style="margin: 0;"> <span id="LC476" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">rebindable</span></span>

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<pre style="margin: 0;">-<span id="LC477" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- all built-in overloaded lits are tau-types, so we can just</span></span>

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<pre style="margin: 0;">-<span id="LC478" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- tauify the ExpType</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="479" 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="477" 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="LC477" 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;">res_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">expTypeToType</span> <span class="n" style="color: #333;">res_ty</span></span>

</pre>

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<td class="diff-line-num new_line" data-linenumber="478" 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="LC478" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getDynFlags</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="481" 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="LC479" class="line" lang="haskell">       <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">platform</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">targetPlatform</span> <span class="n" style="color: #333;">dflags</span></span>

</pre>

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<br>

</li>

<li id="94c96afe1bb3b771ffbcfeeca34ce43ebbe76ccb">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3ecd7b82c4ac35723d09b5e0eaf6b62808805b6e#94c96afe1bb3b771ffbcfeeca34ce43ebbe76ccb"><strong>compiler/GHC/Tc/Utils/TcMType.hs</strong></a>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="36" 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="36" 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">@@ -36,9 +36,10 @@ module GHC.Tc.Utils.TcMType (</td>

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<td class="diff-line-num old_line" data-linenumber="36" 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="LC36" class="line" lang="haskell">  <span class="kt" style="color: #458; font-weight: 600;">ExpType</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">ExpSigmaType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">ExpRhoType</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num new_line" data-linenumber="37" 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="LC37" class="line" lang="haskell">  <span class="nf" style="color: #900; font-weight: 600;">mkCheckExpType</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num new_line" data-linenumber="38" 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="LC38" class="line" lang="haskell">  <span class="nf" style="color: #900; font-weight: 600;">newInferExpType</span><span class="p">,</span></span>

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<td class="diff-line-num old old_line" data-linenumber="39" 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">

39

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<td class="diff-line-num new_line old" data-linenumber="39" 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="LC39" class="line" lang="haskell">  <span class="nf" style="color: #900; font-weight: 600;">readExpType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">readExpType_maybe</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="40" 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">

40

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<td class="diff-line-num new_line old" data-linenumber="39" 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="LC40" class="line" lang="haskell">  <span class="nf" style="color: #900; font-weight: 600;">expTypeToType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">checkingExpType_maybe</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">checkingExpType</span><span class="p">,</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC41" class="line" lang="haskell">  <span class="nf" style="color: #900; font-weight: 600;">tauifyExpType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">inferResultToType</span><span class="p">,</span></span>

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<pre style="margin: 0;">+<span id="LC39" class="line" lang="haskell">  <span class="nf" style="color: #900; font-weight: 600;">readExpType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">readExpType_maybe</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">readScaledExpType</span><span class="p">,</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC40" class="line" lang="haskell">  <span class="nf" style="color: #900; font-weight: 600;">expTypeToType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">scaledExpTypeToType</span><span class="p">,</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC41" class="line" lang="haskell">  <span class="nf" style="color: #900; font-weight: 600;">checkingExpType_maybe</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">checkingExpType</span><span class="p">,</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC42" class="line" lang="haskell">  <span class="nf" style="color: #900; font-weight: 600;">inferResultToType</span><span class="p">,</span></span>

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<pre style="margin: 0;"> <span id="LC43" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC44" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">--------------------------------</span></span>

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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- Creating new evidence variables</span></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="396" 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="397" 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">@@ -396,7 +397,6 @@ checkCoercionHole cv co</td>

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<pre style="margin: 0;"> <span id="LC397" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC398" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [ExpType]</span></span>

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<pre style="margin: 0;"> <span id="LC399" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~</span></span>

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<pre style="margin: 0;">-<span id="LC399" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC400" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">An ExpType is used as the "expected type" when type-checking an expression.</span></span>

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<pre style="margin: 0;"> <span id="LC401" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">An ExpType can hold a "hole" that can be filled in by the type-checker.</span></span>

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<pre style="margin: 0;"> <span id="LC402" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This allows us to have one tcExpr that works in both checking mode and</span></span>

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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="426" 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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<pre style="margin: 0;"> <span id="LC426" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;"> <span id="LC427" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This is a classic untouchable-variable / ambiguous GADT return type</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC428" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">scenario. But, with ExpTypes, we'll be inferring the type of the RHS.</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC429" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">And, because there is only one branch of the case, we won't trigger</span></span>

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<pre style="margin: 0;">-<span id="LC430" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Case branches must never infer a non-tau type] of GHC.Tc.Gen.Match.</span></span>

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<pre style="margin: 0;"> <span id="LC429" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We thus must track a TcLevel in an Inferring ExpType. If we try to</span></span>

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<pre style="margin: 0;">-<span id="LC432" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">fill the ExpType and find that the TcLevels don't work out, we</span></span>

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<pre style="margin: 0;">-<span id="LC433" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">fill the ExpType with a tau-tv at the low TcLevel, hopefully to</span></span></span>

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<pre style="margin: 0;">-<span id="LC434" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">be worked out later by some means. This is triggered in</span></span></span>

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<pre style="margin: 0;">-<span id="LC435" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">test gadt/gadt-escape1</span>.</span></span>

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<pre style="margin: 0;">+<span id="LC430" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">fill the ExpType and find that the TcLevels don't work out, we<span class="idiff left right"> fill</span></span></span>

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<pre style="margin: 0;">+<span id="LC431" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">the ExpType with a tau-tv at the low TcLevel, hopefully to be worked</span></span></span>

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<pre style="margin: 0;">+<span id="LC432" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">out later by some means -- see GHC.Tc.Utils.Unify.fillInferResult,</span></span></span>

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<pre style="margin: 0;">+<span id="LC433" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">and Note [fillInferResult] in that module</span>.</span></span>

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<pre style="margin: 0;"> <span id="LC434" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC435" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This behaviour triggered in test gadt/gadt-escape1.</span></span>

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<pre style="margin: 0;"> <span id="LC436" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>

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<pre style="margin: 0;"> <span id="LC437" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC438" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- actual data definition is in GHC.Tc.Utils.TcType</span></span>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -453,6 +452,12 @@ readExpType_maybe :: ExpType -> TcM (Maybe TcType)</td>

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<pre style="margin: 0;"> <span id="LC452" class="line" lang="haskell"><span class="n" style="color: #333;">readExpType_maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Check</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span>                   <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>

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<pre style="margin: 0;"> <span id="LC453" class="line" lang="haskell"><span class="n" style="color: #333;">readExpType_maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Infer</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IR</span> <span class="p">{</span> <span class="n" style="color: #333;">ir_ref</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ref</span><span class="p">}))</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">readMutVar</span> <span class="n" style="color: #333;">ref</span></span>

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<pre style="margin: 0;"> <span id="LC454" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC455" class="line" lang="haskell"><span class="cd">-- | Same as readExpType, but for Scaled ExpTypes</span></span>

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<pre style="margin: 0;">+<span id="LC456" class="line" lang="haskell"><span class="n" style="color: #333;">readScaledExpType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Scaled</span> <span class="kt" style="color: #458; font-weight: 600;">ExpType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Scaled</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span></span>

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<pre style="margin: 0;">+<span id="LC457" class="line" lang="haskell"><span class="n" style="color: #333;">readScaledExpType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Scaled</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">exp_ty</span><span class="p">)</span></span>

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<pre style="margin: 0;">+<span id="LC458" 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;">ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">readExpType</span> <span class="n" style="color: #333;">exp_ty</span></span>

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<pre style="margin: 0;">+<span id="LC459" 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;">Scaled</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="p">}</span></span>

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<pre style="margin: 0;">+<span id="LC460" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC461" class="line" lang="haskell"><span class="cd">-- | Extract a type out of an ExpType. Otherwise, panics.</span></span>

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<pre style="margin: 0;"> <span id="LC462" class="line" lang="haskell"><span class="n" style="color: #333;">readExpType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ExpType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span></span>

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<pre style="margin: 0;"> <span id="LC463" class="line" lang="haskell"><span class="n" style="color: #333;">readExpType</span> <span class="n" style="color: #333;">exp_ty</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">@@ -472,12 +477,10 @@ checkingExpType :: String -> ExpType -> TcType</td>

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<pre style="margin: 0;"> <span id="LC477" class="line" lang="haskell"><span class="n" style="color: #333;">checkingExpType</span> <span class="kr" style="font-weight: 600;">_</span>   <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Check</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ty</span></span>

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<pre style="margin: 0;"> <span id="LC478" class="line" lang="haskell"><span class="n" style="color: #333;">checkingExpType</span> <span class="n" style="color: #333;">err</span> <span class="n" style="color: #333;">et</span>         <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"checkingExpType"</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="n" style="color: #333;">err</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">et</span><span class="p">)</span></span>

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<pre style="margin: 0;"> <span id="LC479" class="line" lang="haskell"></span>

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<pre style="margin: 0;">-<span id="LC475" class="line" lang="haskell"><span class="n" style="color: #333;">tauifyExpType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ExpType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">ExpType</span></span>

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<pre style="margin: 0;">-<span id="LC476" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ^ Turn a (Infer hole) type into a (Check alpha),</span></span>

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<pre style="margin: 0;">-<span id="LC477" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- where alpha is a fresh unification variable</span></span>

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<pre style="margin: 0;">-<span id="LC478" class="line" lang="haskell"><span class="n" style="color: #333;">tauifyExpType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Check</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span>      <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Check</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span>  <span class="c1" style="color: #998; font-style: italic;">-- No-op for (Check ty)</span></span>

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<pre style="margin: 0;">-<span id="LC479" class="line" lang="haskell"><span class="n" style="color: #333;">tauifyExpType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Infer</span> <span class="n" style="color: #333;">inf_res</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">inferResultToType</span> <span class="n" style="color: #333;">inf_res</span></span>

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<pre style="margin: 0;">-<span id="LC480" 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;">Check</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="p">}</span></span>

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<pre style="margin: 0;">+<span id="LC480" class="line" lang="haskell"><span class="n" style="color: #333;">scaledExpTypeToType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Scaled</span> <span class="kt" style="color: #458; font-weight: 600;">ExpType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Scaled</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">)</span></span>

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<pre style="margin: 0;">+<span id="LC481" class="line" lang="haskell"><span class="n" style="color: #333;">scaledExpTypeToType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Scaled</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">exp_ty</span><span class="p">)</span></span>

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<pre style="margin: 0;">+<span id="LC482" 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;">ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">expTypeToType</span> <span class="n" style="color: #333;">exp_ty</span></span>

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<pre style="margin: 0;">+<span id="LC483" 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;">Scaled</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="p">}</span></span>

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<pre style="margin: 0;"> <span id="LC484" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;"> <span id="LC485" class="line" lang="haskell"><span class="cd">-- | Extracts the expected type if there is one, or generates a new</span></span>

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<pre style="margin: 0;"> <span id="LC486" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- TauTv if there isn't.</span></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="488" 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="491" 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">@@ -488,13 +491,17 @@ expTypeToType (Infer inf_res) = inferResultToType inf_res</td>

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<pre style="margin: 0;"> <span id="LC491" class="line" lang="haskell"><span class="n" style="color: #333;">inferResultToType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">InferResult</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span></span>

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<pre style="margin: 0;"> <span id="LC492" class="line" lang="haskell"><span class="n" style="color: #333;">inferResultToType</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IR</span> <span class="p">{</span> <span class="n" style="color: #333;">ir_uniq</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">u</span><span class="p">,</span> <span class="n" style="color: #333;">ir_lvl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tc_lvl</span></span>

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<pre style="margin: 0;"> <span id="LC493" class="line" lang="haskell">                      <span class="p">,</span> <span class="n" style="color: #333;">ir_ref</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ref</span> <span class="p">})</span></span>

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<pre style="margin: 0;">-<span id="LC491" 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;">rr</span>  <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newMetaTyVarTyAtLevel</span> <span class="n" style="color: #333;">tc_lvl</span> <span class="n" style="color: #333;">runtimeRepTy</span></span>

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<td class="diff-line-num new new_line" data-linenumber="494" 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="LC494" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">mb_inferred_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">readTcRef</span> <span class="n" style="color: #333;">ref</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="495" 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="LC495" class="line" lang="haskell">       <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">mb_inferred_ty</span> <span class="kr" style="font-weight: 600;">of</span> <span class="p">{</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="496" 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="LC496" class="line" lang="haskell">            <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">ty</span> <span class="p">;</span></span>

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497

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<pre style="margin: 0;">+<span id="LC497" class="line" lang="haskell">            <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="492" 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="498" 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">

498

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<pre style="margin: 0;">+<span id="LC498" class="line" lang="haskell">    <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">rr</span>  <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newMetaTyVarTyAtLevel</span> <span class="n" style="color: #333;">tc_lvl</span> <span class="n" style="color: #333;">runtimeRepTy</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="492" 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">

492

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<td class="diff-line-num new_line" data-linenumber="499" 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">

499

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<pre style="margin: 0;"> <span id="LC499" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">tau</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newMetaTyVarTyAtLevel</span> <span class="n" style="color: #333;">tc_lvl</span> <span class="p">(</span><span class="n" style="color: #333;">tYPE</span> <span class="n" style="color: #333;">rr</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="493" 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">

493

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<td class="diff-line-num new_line" data-linenumber="500" 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">

500

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<pre style="margin: 0;"> <span id="LC500" class="line" lang="haskell">             <span class="c1" style="color: #998; font-style: italic;">-- See Note [TcLevel of ExpType]</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="494" 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">

494

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<td class="diff-line-num new_line" data-linenumber="501" 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">

501

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<pre style="margin: 0;"> <span id="LC501" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">writeMutVar</span> <span class="n" style="color: #333;">ref</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="495" 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">

495

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<td class="diff-line-num new_line" data-linenumber="502" 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">

502

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<pre style="margin: 0;"> <span id="LC502" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"Forcing ExpType to be monomorphic:"</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="496" 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">

496

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<td class="diff-line-num new_line" data-linenumber="503" 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">

503

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<pre style="margin: 0;"> <span id="LC503" class="line" lang="haskell">                 <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">u</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">":="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span></span>

</pre>

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497

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<td class="diff-line-num new_line old" data-linenumber="504" 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="LC497" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">tau</span> <span class="p">}</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="498" 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="504" 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">

504

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<pre style="margin: 0;">+<span id="LC504" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">tau</span> <span class="p">}</span><span class="idiff left"> </span><span class="p"><span class="idiff">}</span></span><span class="idiff"> </span><span class="p"><span class="idiff right">}</span></span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="498" 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">

498

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<td class="diff-line-num new_line" data-linenumber="505" 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">

505

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<pre style="margin: 0;"> <span id="LC505" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="499" 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">

499

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<td class="diff-line-num new_line" data-linenumber="506" 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">

506

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

<pre style="margin: 0;"> <span id="LC506" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="500" 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">

500

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<td class="diff-line-num new_line" data-linenumber="507" 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">

507

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<pre style="margin: 0;"> <span id="LC507" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *********************************************************************</span></span>

</pre>

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<br>

</li>

<li id="74295edeac870ee7f2f3484ebaffab5c948b735a">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3ecd7b82c4ac35723d09b5e0eaf6b62808805b6e#74295edeac870ee7f2f3484ebaffab5c948b735a"><strong>compiler/GHC/Tc/Utils/Unify.hs</strong></a>

<hr>

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<td class="diff-line-num unfold js-unfold 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">...</td>

<td class="diff-line-num unfold js-unfold new_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">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -793,33 +793,25 @@ instantiateAndFillInferResult orig ty inf_res</td>

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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="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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<pre style="margin: 0;"> <span id="LC793" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">mkWpCastN</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;"><.></span> <span class="n" style="color: #333;">wrap</span><span class="p">)</span> <span class="p">}</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="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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<pre style="margin: 0;"> <span id="LC794" 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="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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<pre style="margin: 0;"> <span id="LC795" class="line" lang="haskell"><span class="n" style="color: #333;">fillInferResult</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">InferResult</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">TcCoercionN</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="796" 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">

796

</td>

<td class="diff-line-num new_line old" data-linenumber="796" 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="LC796" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If wrap = fillInferResult t1 t2</span></span>

</pre>

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

797

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<td class="diff-line-num new_line old" data-linenumber="796" 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="LC797" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--    => wrap :: t1 ~> t2</span></span>

</pre>

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

798

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<td class="diff-line-num new_line old" data-linenumber="796" 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="LC798" class="line" lang="haskell"><span class="n" style="color: #333;">fillInferResult</span> <span class="n" style="color: #333;">orig_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IR</span> <span class="p">{</span> <span class="n" style="color: #333;">ir_uniq</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">u</span><span class="p">,</span> <span class="n" style="color: #333;">ir_lvl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">res_lvl</span></span>

</pre>

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

799

</td>

<td class="diff-line-num new_line old" data-linenumber="796" 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="LC799" class="line" lang="haskell">                            <span class="p">,</span> <span class="n" style="color: #333;">ir_ref</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ref</span> <span class="p">})</span></span>

</pre>

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

800

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<td class="diff-line-num new_line old" data-linenumber="796" 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="LC800" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">ty_co</span><span class="p">,</span> <span class="n" style="color: #333;">ty_to_fill_with</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">promoteTcType</span> <span class="n" style="color: #333;">res_lvl</span> <span class="n" style="color: #333;">orig_ty</span></span>

</pre>

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

801

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<td class="diff-line-num new_line old" data-linenumber="796" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="line_content old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<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="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">

802

</td>

<td class="diff-line-num new_line old" data-linenumber="796" 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="LC802" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"Filling ExpType"</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="803" 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">

803

</td>

<td class="diff-line-num new_line old" data-linenumber="796" 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="LC803" class="line" lang="haskell">         <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">u</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">":="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty_to_fill_with</span></span>

</pre>

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

804

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<td class="diff-line-num new_line old" data-linenumber="796" 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="LC804" class="line" lang="haskell"></span>

</pre>

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

805

</td>

<td class="diff-line-num new_line old" data-linenumber="796" 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="LC805" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">when</span> <span class="n" style="color: #333;">debugIsOn</span> <span class="p">(</span><span class="n" style="color: #333;">check_hole</span> <span class="n" style="color: #333;">ty_to_fill_with</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="806" 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">

806

</td>

<td class="diff-line-num new_line old" data-linenumber="796" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="line_content old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC806" class="line" lang="haskell"></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="807" 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">

807

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<td class="diff-line-num new_line old" data-linenumber="796" 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="LC807" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">writeTcRef</span> <span class="n" style="color: #333;">ref</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">ty_to_fill_with</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="808" 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">

808

</td>

<td class="diff-line-num new_line old" data-linenumber="796" 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>

<td class="line_content old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC808" class="line" lang="haskell"></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="809" 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">

809

</td>

<td class="diff-line-num new_line old" data-linenumber="796" 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="LC809" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">ty_co</span> <span class="p">}</span></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="810" 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">

810

</td>

<td class="diff-line-num new_line old" data-linenumber="796" 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="LC810" 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 old_line" data-linenumber="811" 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">

811

</td>

<td class="diff-line-num new_line old" data-linenumber="796" 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="LC811" class="line" lang="haskell">    <span class="n" style="color: #333;">check_hole</span> <span class="n" style="color: #333;">ty</span>   <span class="c1" style="color: #998; font-style: italic;">-- Debug check only</span></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="812" 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">

812

</td>

<td class="diff-line-num new_line old" data-linenumber="796" 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="LC812" class="line" lang="haskell">      <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ty_lvl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcTypeLevel</span> <span class="n" style="color: #333;">ty</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="813" 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">

813

</td>

<td class="diff-line-num new_line old" data-linenumber="796" 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="LC813" class="line" lang="haskell">           <span class="p">;</span> <span class="kt" style="color: #458; font-weight: 600;">MASSERT2</span><span class="p">(</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">ty_lvl</span> <span class="p">`</span><span class="n" style="color: #333;">strictlyDeeperThan</span><span class="p">`</span> <span class="n" style="color: #333;">res_lvl</span><span class="p">),</span></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="814" 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">

814

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<td class="diff-line-num new_line old" data-linenumber="796" 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="LC814" class="line" lang="haskell">                       <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">u</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">res_lvl</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty_lvl</span> <span class="o" style="font-weight: 600;">$$</span></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="815" 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">

815

</td>

<td class="diff-line-num new_line old" data-linenumber="796" 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="LC815" class="line" lang="haskell">                       <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">tcTypeKind</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">orig_ty</span> <span class="p">)</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="816" 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">

816

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<pre style="margin: 0;">-<span id="LC816" class="line" lang="haskell">           <span class="p">;</span> <span class="n" style="color: #333;">cts</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">readTcRef</span> <span class="n" style="color: #333;">ref</span></span>

</pre>

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

817

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<td class="diff-line-num new_line old" data-linenumber="796" 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="LC817" class="line" lang="haskell">           <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">cts</span> <span class="kr" style="font-weight: 600;">of</span></span>

</pre>

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

818

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<td class="diff-line-num new_line old" data-linenumber="796" 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="LC818" class="line" lang="haskell">               <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">already_there</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"writeExpType"</span></span>

</pre>

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

819

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<td class="diff-line-num new_line old" data-linenumber="796" 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="LC819" class="line" lang="haskell">                                       <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">u</span></span>

</pre>

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

820

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<td class="diff-line-num new_line old" data-linenumber="796" 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="LC820" class="line" lang="haskell">                                             <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty</span></span>

</pre>

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

821

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<pre style="margin: 0;">-<span id="LC821" class="line" lang="haskell">                                             <span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">already_there</span> <span class="p">])</span></span>

</pre>

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

822

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<td class="diff-line-num new_line old" data-linenumber="796" 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="LC822" class="line" lang="haskell">               <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span> <span class="p">}</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="823" 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="796" 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">

796

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<pre style="margin: 0;">+<span id="LC796" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If co = fillInferResult t1 t2</span></span>

</pre>

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

797

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<pre style="margin: 0;">+<span id="LC797" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--    => co :: t1 ~ t2</span></span>

</pre>

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

798

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<pre style="margin: 0;">+<span id="LC798" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [fillInferResult]</span></span>

</pre>

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

799

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<pre style="margin: 0;">+<span id="LC799" class="line" lang="haskell"><span class="n" style="color: #333;">fillInferResult</span> <span class="n" style="color: #333;">act_res_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IR</span> <span class="p">{</span> <span class="n" style="color: #333;">ir_uniq</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">u</span><span class="p">,</span> <span class="n" style="color: #333;">ir_lvl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">res_lvl</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="823" 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="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="p">,</span> <span class="n" style="color: #333;">ir_ref</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ref</span> <span class="p">})</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="823" 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="801" 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">

801

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<pre style="margin: 0;">+<span id="LC801" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">mb_exp_res_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">readTcRef</span> <span class="n" style="color: #333;">ref</span></span>

</pre>

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</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="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">mb_exp_res_ty</span> <span class="kr" style="font-weight: 600;">of</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="823" 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="803" 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">

803

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<pre style="margin: 0;">+<span id="LC803" class="line" lang="haskell">            <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">exp_res_ty</span></span>

</pre>

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

804

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<pre style="margin: 0;">+<span id="LC804" class="line" lang="haskell">               <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"Joining inferred ExpType"</span> <span class="o" style="font-weight: 600;">$</span></span>

</pre>

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

805

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<pre style="margin: 0;">+<span id="LC805" class="line" lang="haskell">                       <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">u</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">colon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">act_res_ty</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">char</span> <span class="sc" style="color: #d14;">'~'</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">exp_res_ty</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="806" 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">

806

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<pre style="margin: 0;">+<span id="LC806" class="line" lang="haskell">                     <span class="p">;</span> <span class="n" style="color: #333;">ensureMonoType</span> <span class="n" style="color: #333;">res_lvl</span> <span class="n" style="color: #333;">act_res_ty</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="807" 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">

807

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<pre style="margin: 0;">+<span id="LC807" class="line" lang="haskell">                     <span class="p">;</span> <span class="n" style="color: #333;">unifyType</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="n" style="color: #333;">act_res_ty</span> <span class="n" style="color: #333;">exp_res_ty</span> <span class="p">}</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="823" 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="808" 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">

808

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<pre style="margin: 0;">+<span id="LC808" class="line" lang="haskell">            <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="809" 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">

809

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<pre style="margin: 0;">+<span id="LC809" class="line" lang="haskell">               <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"Filling inferred ExpType"</span> <span class="o" style="font-weight: 600;">$</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="823" 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="810" 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">

810

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<pre style="margin: 0;">+<span id="LC810" class="line" lang="haskell">                       <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">u</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">":="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">act_res_ty</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="823" 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="811" 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">

811

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<pre style="margin: 0;">+<span id="LC811" class="line" lang="haskell">                     <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">prom_co</span><span class="p">,</span> <span class="n" style="color: #333;">act_res_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">promoteTcType</span> <span class="n" style="color: #333;">res_lvl</span> <span class="n" style="color: #333;">act_res_ty</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="812" 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">

812

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<pre style="margin: 0;">+<span id="LC812" class="line" lang="haskell">                     <span class="p">;</span> <span class="n" style="color: #333;">writeTcRef</span> <span class="n" style="color: #333;">ref</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">act_res_ty</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="813" 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">

813

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<pre style="margin: 0;">+<span id="LC813" class="line" lang="haskell">                     <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">prom_co</span> <span class="p">}</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="823" 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="814" 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">

814

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<pre style="margin: 0;">+<span id="LC814" class="line" lang="haskell">     <span class="p">}</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="823" 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">

823

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<td class="diff-line-num new_line" data-linenumber="815" 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">

815

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<pre style="margin: 0;"> <span id="LC815" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="824" 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">

824

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<td class="diff-line-num new_line" data-linenumber="816" 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">

816

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<pre style="margin: 0;"> <span id="LC816" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Instantiation of InferResult]</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="825" 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">

825

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<td class="diff-line-num new_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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<pre style="margin: 0;"> <span id="LC817" 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 unfold js-unfold old_line" data-linenumber="857" 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="849" 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">@@ -857,6 +849,81 @@ There is one place where we don't want to instantiate eagerly,</td>

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857

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849

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<pre style="margin: 0;"> <span id="LC849" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">namely in GHC.Tc.Module.tcRnExpr, which implements GHCi's :type</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="858" 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">

858

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<td class="diff-line-num new_line" data-linenumber="850" 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">

850

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<pre style="margin: 0;"> <span id="LC850" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">command. See Note [Implementing :type] in GHC.Tc.Module.</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="859" 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">

859

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<td class="diff-line-num new_line" data-linenumber="851" 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">

851

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<pre style="margin: 0;"> <span id="LC851" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="860" 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="852" 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">

852

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<pre style="margin: 0;">+<span id="LC852" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [fillInferResult]</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="853" 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">

853

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<pre style="margin: 0;">+<span id="LC853" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~</span></span>

</pre>

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</td>

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854

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<pre style="margin: 0;">+<span id="LC854" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">When inferring, we use fillInferResult to "fill in" the hole in InferResult</span></span>

</pre>

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</td>

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855

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<pre style="margin: 0;">+<span id="LC855" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   data InferResult = IR { ir_uniq :: Unique</span></span>

</pre>

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</td>

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856

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<pre style="margin: 0;">+<span id="LC856" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">                         , ir_lvl  :: TcLevel</span></span>

</pre>

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857

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<pre style="margin: 0;">+<span id="LC857" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">                         , ir_ref  :: IORef (Maybe TcType) }</span></span>

</pre>

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858

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<pre style="margin: 0;">+<span id="LC858" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="859" 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">

859

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<pre style="margin: 0;">+<span id="LC859" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">There are two things to worry about:</span></span>

</pre>

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860

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<pre style="margin: 0;">+<span id="LC860" class="line" lang="haskell"></span>

</pre>

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861

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<pre style="margin: 0;">+<span id="LC861" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">1. What if it is under a GADT or existential pattern match?</span></span>

</pre>

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862

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<pre style="margin: 0;">+<span id="LC862" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   - GADTs: a unification variable (and Infer's hole is similar) is untouchable</span></span>

</pre>

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863

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<pre style="margin: 0;">+<span id="LC863" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   - Existentials: be careful about skolem-escape</span></span>

</pre>

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864

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<pre style="margin: 0;">+<span id="LC864" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="865" 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">

865

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<pre style="margin: 0;">+<span id="LC865" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">2. What if it is filled in more than once?  E.g. multiple branches of a case</span></span>

</pre>

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866

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<pre style="margin: 0;">+<span id="LC866" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">     case e of</span></span>

</pre>

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867

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<pre style="margin: 0;">+<span id="LC867" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        T1 -> e1</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="868" 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">

868

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<pre style="margin: 0;">+<span id="LC868" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        T2 -> e2</span></span>

</pre>

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869

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<pre style="margin: 0;">+<span id="LC869" class="line" lang="haskell"></span>

</pre>

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870

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<pre style="margin: 0;">+<span id="LC870" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Our typing rules are:</span></span>

</pre>

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871

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<pre style="margin: 0;">+<span id="LC871" class="line" lang="haskell"></span>

</pre>

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872

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<pre style="margin: 0;">+<span id="LC872" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* The RHS of a existential or GADT alternative must always be a</span></span>

</pre>

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873

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<pre style="margin: 0;">+<span id="LC873" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  monotype, regardless of the number of alternatives.</span></span>

</pre>

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874

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<pre style="margin: 0;">+<span id="LC874" class="line" lang="haskell"></span>

</pre>

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875

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<pre style="margin: 0;">+<span id="LC875" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Multiple non-existential/GADT branches can have (the same)</span></span>

</pre>

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876

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<pre style="margin: 0;">+<span id="LC876" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  higher rank type (#18412).  E.g. this is OK:</span></span>

</pre>

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877

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<pre style="margin: 0;">+<span id="LC877" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">      case e of</span></span>

</pre>

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878

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<pre style="margin: 0;">+<span id="LC878" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        True  -> hr</span></span>

</pre>

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879

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<pre style="margin: 0;">+<span id="LC879" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        False -> hr</span></span>

</pre>

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880

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<pre style="margin: 0;">+<span id="LC880" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  where hr:: (forall a. a->a) -> Int</span></span>

</pre>

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881

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<pre style="margin: 0;">+<span id="LC881" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  c.f. Section 7.1 of "Practical type inference for arbitrary-rank types"</span></span>

</pre>

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882

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<pre style="margin: 0;">+<span id="LC882" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">       We use choice (2) in that Section.</span></span>

</pre>

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883

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<pre style="margin: 0;">+<span id="LC883" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">       (GHC 8.10 and earlier used choice (1).)</span></span>

</pre>

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884

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<pre style="margin: 0;">+<span id="LC884" class="line" lang="haskell"></span>

</pre>

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885

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<pre style="margin: 0;">+<span id="LC885" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  But note that</span></span>

</pre>

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886

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<pre style="margin: 0;">+<span id="LC886" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">      case e of</span></span>

</pre>

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887

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<pre style="margin: 0;">+<span id="LC887" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        True  -> hr</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="888" 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">

888

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<pre style="margin: 0;">+<span id="LC888" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        False -> \x -> hr x</span></span>

</pre>

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889

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<pre style="margin: 0;">+<span id="LC889" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  will fail, because we still /infer/ both branches, so the \x will get</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="890" 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">

890

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<pre style="margin: 0;">+<span id="LC890" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  a (monotype) unification variable, which will fail to unify with</span></span>

</pre>

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891

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<pre style="margin: 0;">+<span id="LC891" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  (forall a. a->a)</span></span>

</pre>

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892

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<pre style="margin: 0;">+<span id="LC892" class="line" lang="haskell"></span>

</pre>

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893

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<pre style="margin: 0;">+<span id="LC893" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For (1) we can detect the GADT/existential situation by seeing that</span></span>

</pre>

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894

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<pre style="margin: 0;">+<span id="LC894" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the current TcLevel is greater than that stored in ir_lvl of the Infer</span></span>

</pre>

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895

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<pre style="margin: 0;">+<span id="LC895" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">ExpType.  We bump the level whenever we go past a GADT/existential match.</span></span>

</pre>

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896

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<pre style="margin: 0;">+<span id="LC896" class="line" lang="haskell"></span>

</pre>

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897

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<pre style="margin: 0;">+<span id="LC897" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Then, before filling the hole use promoteTcType to promote the type</span></span>

</pre>

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898

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<pre style="margin: 0;">+<span id="LC898" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to the outer ir_lvl.  promoteTcType does this</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="899" 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">

899

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<pre style="margin: 0;">+<span id="LC899" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  - create a fresh unification variable alpha at level ir_lvl</span></span>

</pre>

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900

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<pre style="margin: 0;">+<span id="LC900" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  - emits an equality alpha[ir_lvl] ~ ty</span></span>

</pre>

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901

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<pre style="margin: 0;">+<span id="LC901" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  - fills the hole with alpha</span></span>

</pre>

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902

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<pre style="margin: 0;">+<span id="LC902" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">That forces the type to be a monotype (since unification variables can</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="903" 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">

903

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<pre style="margin: 0;">+<span id="LC903" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">only unify with monotypes); and catches skolem-escapes because the</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="904" 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">

904

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<pre style="margin: 0;">+<span id="LC904" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">alpha is untouchable until the equality floats out.</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="905" 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">

905

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<pre style="margin: 0;">+<span id="LC905" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="906" 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">

906

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<pre style="margin: 0;">+<span id="LC906" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For (2), we simply look to see if the hole is filled already.</span></span>

</pre>

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907

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<pre style="margin: 0;">+<span id="LC907" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  - if not, we promote (as above) and fill the hole</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="908" 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">

908

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<pre style="margin: 0;">+<span id="LC908" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  - if it is filled, we simply unify with the type that is</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="909" 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">

909

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<pre style="margin: 0;">+<span id="LC909" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">    already there</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="910" 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">

910

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<pre style="margin: 0;">+<span id="LC910" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="911" 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">

911

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<pre style="margin: 0;">+<span id="LC911" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">There is one wrinkle.  Suppose we have</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="912" 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">

912

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<pre style="margin: 0;">+<span id="LC912" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   case e of</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="913" 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">

913

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<pre style="margin: 0;">+<span id="LC913" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">      T1 -> e1 :: (forall a. a->a) -> Int</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="914" 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">

914

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<pre style="margin: 0;">+<span id="LC914" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">      G2 -> e2</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="915" 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">

915

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<pre style="margin: 0;">+<span id="LC915" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">where T1 is not GADT or existential, but G2 is a GADT.  Then supppose the</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="916" 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">

916

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<pre style="margin: 0;">+<span id="LC916" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">T1 alternative fills the hole with (forall a. a->a) -> Int, which is fine.</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="917" 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">

917

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<pre style="margin: 0;">+<span id="LC917" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But now the G2 alternative must not *just* unify with that else we'd risk</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="918" 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">

918

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<pre style="margin: 0;">+<span id="LC918" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">allowing through (e2 :: (forall a. a->a) -> Int).  If we'd checked G2 first</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="919" 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">

919

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<pre style="margin: 0;">+<span id="LC919" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we'd have filled the hole with a unification variable, which enforces a</span></span>

</pre>

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</td>

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920

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<pre style="margin: 0;">+<span id="LC920" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">monotype.</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="921" 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">

921

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<pre style="margin: 0;">+<span id="LC921" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="922" 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">

922

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<pre style="margin: 0;">+<span id="LC922" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So if we check G2 second, we still want to emit a constraint that restricts</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="923" 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">

923

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<pre style="margin: 0;">+<span id="LC923" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the RHS to be a monotype. This is done by ensureMonoType, and it works</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="924" 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">

924

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<pre style="margin: 0;">+<span id="LC924" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">by simply generating a constraint (alpha ~ ty), where alpha is a fresh</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="925" 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">

925

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<pre style="margin: 0;">+<span id="LC925" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">unification variable.  We discard the evidence.</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="926" 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">

926

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<pre style="margin: 0;">+<span id="LC926" class="line" lang="haskell"></span>

</pre>

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860

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<td class="diff-line-num new_line" data-linenumber="927" 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">

927

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<pre style="margin: 0;"> <span id="LC927" 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 old_line" data-linenumber="861" 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">

861

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<td class="diff-line-num new_line" data-linenumber="928" 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">

928

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<pre style="margin: 0;"> <span id="LC928" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="862" 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">

862

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<td class="diff-line-num new_line" data-linenumber="929" 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">

929

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<pre style="margin: 0;"> <span id="LC929" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *********************************************************************</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="865" 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="932" 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">@@ -865,8 +932,22 @@ command. See Note [Implementing :type] in GHC.Tc.Module.</td>

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865

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932

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<pre style="margin: 0;"> <span id="LC932" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">*                                                                      *</span></span>

</pre>

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866

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<td class="diff-line-num new_line" data-linenumber="933" 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">

933

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<pre style="margin: 0;"> <span id="LC933" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">********************************************************************* -}</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="867" 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">

867

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<td class="diff-line-num new_line" data-linenumber="934" 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">

934

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<pre style="margin: 0;"> <span id="LC934" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="868" 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="935" 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">

935

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<pre style="margin: 0;">+<span id="LC935" class="line" lang="haskell"><span class="n" style="color: #333;">ensureMonoType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcLevel</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="868" 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="936" 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">

936

</td>

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

<pre style="margin: 0;">+<span id="LC936" class="line" lang="haskell"><span class="n" style="color: #333;">ensureMonoType</span> <span class="n" style="color: #333;">dest_lvl</span> <span class="n" style="color: #333;">res_ty</span></span>

</pre>

</td>

</tr>

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

<td class="diff-line-num new old_line" data-linenumber="868" 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="937" 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">

937

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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="LC937" 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;">cur_lvl</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getTcLevel</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="868" 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="938" 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">

938

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<pre style="margin: 0;">+<span id="LC938" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">unless</span> <span class="p">(</span><span class="n" style="color: #333;">cur_lvl</span> <span class="p">`</span><span class="n" style="color: #333;">sameDepthAs</span><span class="p">`</span> <span class="n" style="color: #333;">dest_lvl</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="868" 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="939" 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">

939

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<pre style="margin: 0;">+<span id="LC939" class="line" lang="haskell">         <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">mono_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newOpenFlexiTyVarTy</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="868" 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="940" 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">

940

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<pre style="margin: 0;">+<span id="LC940" class="line" lang="haskell">            <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">eq_orig</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TypeEqOrigin</span> <span class="p">{</span> <span class="n" style="color: #333;">uo_actual</span>   <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">res_ty</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="868" 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="941" 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">

941

</td>

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<pre style="margin: 0;">+<span id="LC941" class="line" lang="haskell">                                         <span class="p">,</span> <span class="n" style="color: #333;">uo_expected</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mono_ty</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="868" 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="942" 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">

942

</td>

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<pre style="margin: 0;">+<span id="LC942" class="line" lang="haskell">                                         <span class="p">,</span> <span class="n" style="color: #333;">uo_thing</span>    <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="868" 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="943" 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">

943

</td>

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<pre style="margin: 0;">+<span id="LC943" class="line" lang="haskell">                                         <span class="p">,</span> <span class="n" style="color: #333;">uo_visible</span>  <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="p">}</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="868" 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="944" 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">

944

</td>

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

<pre style="margin: 0;">+<span id="LC944" class="line" lang="haskell"></span>

</pre>

</td>

</tr>

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

<td class="diff-line-num new old_line" data-linenumber="868" 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="945" 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">

945

</td>

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<pre style="margin: 0;">+<span id="LC945" class="line" lang="haskell">            <span class="p">;</span> <span class="n" style="color: #333;">_co</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">emitWantedEq</span> <span class="n" style="color: #333;">eq_orig</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">res_ty</span> <span class="n" style="color: #333;">mono_ty</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="868" 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="946" 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">

946

</td>

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<pre style="margin: 0;">+<span id="LC946" class="line" lang="haskell">            <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span> <span class="p">}</span> <span class="p">}</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="868" 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="947" 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">

947

</td>

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

<pre style="margin: 0;">+<span id="LC947" class="line" lang="haskell"></span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="868" 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">

868

</td>

<td class="diff-line-num new_line" data-linenumber="948" 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">

948

</td>

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<pre style="margin: 0;"> <span id="LC948" class="line" lang="haskell"><span class="n" style="color: #333;">promoteTcType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcLevel</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcCoercion</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">)</span></span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="869" 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">

869

</td>

<td class="diff-line-num new_line" data-linenumber="949" 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">

949

</td>

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<pre style="margin: 0;"> <span id="LC949" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Promoting a type]</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="870" 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="950" 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">

950

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<pre style="margin: 0;">+<span id="LC950" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See also Note [fillInferResult]</span></span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="870" 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">

870

</td>

<td class="diff-line-num new_line" data-linenumber="951" 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">

951

</td>

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

<pre style="margin: 0;"> <span id="LC951" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- promoteTcType level ty = (co, ty')</span></span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="871" 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">

871

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<pre style="margin: 0;"> <span id="LC952" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--   * Returns ty'  whose max level is just 'level'</span></span>

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<pre style="margin: 0;"> <span id="LC953" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--             and  whose kind is ~# to the kind of 'ty'</span></span>

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<br>

</li>

<li id="76b1e7dce1b4954525a28c2fed28ba31ca27a964">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3ecd7b82c4ac35723d09b5e0eaf6b62808805b6e#76b1e7dce1b4954525a28c2fed28ba31ca27a964"><strong>testsuite/tests/simplCore/should_compile/T17901.stdout</strong></a>

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<pre style="margin: 0;">-<span id="LC1" class="line" lang="plaintext">                 (wombat1 [Occ=Once*!] :: T -> <span class="idiff left right">p</span>)</span>

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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">                 (wombat1 [Occ=Once*!] :: T -> <span class="idiff left right">t</span>)</span>

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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">                   A -> wombat1 T17901.A;</span>

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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext">                   B -> wombat1 T17901.B;</span>

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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext">                   C -> wombat1 T17901.C</span>

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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext">  = \ (@<span class="idiff left right">p) (wombat1 :: T -> p</span>) (x :: T) -></span>

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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext">  = \ (@<span class="idiff left right">t) (wombat1 :: T -> t</span>) (x :: T) -></span>

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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext">      case x of wild { __DEFAULT -> wombat1 wild }</span>

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<pre style="margin: 0;">-<span id="LC7" class="line" lang="plaintext">         Tmpl= \ (@<span class="idiff left right">p) (wombat2 [Occ=Once!] :: S -> p</span>) (x [Occ=Once] :: S) -></span>

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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext">         Tmpl= \ (@<span class="idiff left right">t) (wombat2 [Occ=Once!] :: S -> t</span>) (x [Occ=Once] :: S) -></span>

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<pre style="margin: 0;"> <span id="LC8" class="line" lang="plaintext">                 case x of wild [Occ=Once] { __DEFAULT -> wombat2 wild }}]</span>

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<pre style="margin: 0;">-<span id="LC9" class="line" lang="plaintext">  = \ (@<span class="idiff left right">p) (wombat2 :: S -> p</span>) (x :: S) -></span>

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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext">  = \ (@<span class="idiff left right">t) (wombat2 :: S -> t</span>) (x :: S) -></span>

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<pre style="margin: 0;"> <span id="LC10" class="line" lang="plaintext">      case x of wild { __DEFAULT -> wombat2 wild }</span>

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<pre style="margin: 0;">-<span id="LC11" class="line" lang="plaintext">         Tmpl= \ (@<span class="idiff left right">p) (wombat3 [Occ=Once!] :: W -> p</span>) (x [Occ=Once] :: W) -></span>

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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext">         Tmpl= \ (@<span class="idiff left right">t) (wombat3 [Occ=Once!] :: W -> t</span>) (x [Occ=Once] :: W) -></span>

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<pre style="margin: 0;"> <span id="LC12" class="line" lang="plaintext">                 case x of wild [Occ=Once] { __DEFAULT -> wombat3 wild }}]</span>

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<pre style="margin: 0;">-<span id="LC13" class="line" lang="plaintext">  = \ (@<span class="idiff left right">p) (wombat3 :: W -> p</span>) (x :: W) -></span>

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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext">  = \ (@<span class="idiff left right">t) (wombat3 :: W -> t</span>) (x :: W) -></span>

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<pre style="margin: 0;"> <span id="LC14" class="line" lang="plaintext">      case x of wild { __DEFAULT -> wombat3 wild }</span></pre>

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</li>

<li id="32573c6529fd33f769071231b058ea20cd2d4b0d">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3ecd7b82c4ac35723d09b5e0eaf6b62808805b6e#32573c6529fd33f769071231b058ea20cd2d4b0d"><strong>testsuite/tests/typecheck/should_compile/T18412.hs</strong></a>

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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE RankNTypes #-}</span></span>

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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T18412</span> <span class="kr" style="font-weight: 600;">where</span></span>

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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="n" style="color: #333;">hr</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span><span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span></span>

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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="n" style="color: #333;">hr</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>

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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="n" style="color: #333;">foo</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">x</span> <span class="kr" style="font-weight: 600;">of</span> <span class="nb" style="color: #0086b3;">()</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">hr</span></span>

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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This did not use to be allowed, because the</span></span>

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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- multiple branches have (the same) polytypes</span></span>

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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Enhancement July 2020</span></span>

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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="n" style="color: #333;">bar</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">x</span> <span class="kr" style="font-weight: 600;">of</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">hr</span></span>

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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell">                  <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">hr</span></span></pre>

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</li>

<li id="34fe7bf0e6fbf60effb28393399ba68666593909">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3ecd7b82c4ac35723d09b5e0eaf6b62808805b6e#34fe7bf0e6fbf60effb28393399ba68666593909"><strong>testsuite/tests/typecheck/should_compile/all.T</strong></a>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -716,3 +716,4 @@ test('T17775-viewpats-a', normal, compile, [''])</td>

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<pre style="margin: 0;"> <span id="LC716" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17775-viewpats-b</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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717

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<pre style="margin: 0;"> <span id="LC717" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17775-viewpats-c</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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718

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718

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<pre style="margin: 0;"> <span id="LC718" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17775-viewpats-d</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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719

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<pre style="margin: 0;">+<span id="LC719" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18412</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="fb81f990ca209fe548e11dc52c6cf80c0bdf31a9">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3ecd7b82c4ac35723d09b5e0eaf6b62808805b6e#fb81f990ca209fe548e11dc52c6cf80c0bdf31a9"><strong>testsuite/tests/typecheck/should_fail/T10619.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>

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2

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<pre style="margin: 0;">-<span id="LC2" class="line" lang="plaintext">T10619.hs:9:15: error:</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 ‘p’ with ‘forall b. b -> b’</span>

</pre>

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4

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

</pre>

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5

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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext">        Actual: (forall a. a -> a) -> forall b. b -> b</span>

</pre>

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6

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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext">      ‘p’ is a rigid type variable bound by</span>

</pre>

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7

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<pre style="margin: 0;">-<span id="LC7" class="line" lang="plaintext">        the inferred type of foo :: p1 -> p -> p</span>

</pre>

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8

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<pre style="margin: 0;">-<span id="LC8" class="line" lang="plaintext">        at T10619.hs:(8,1)-(10,20)</span>

</pre>

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9

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<pre style="margin: 0;">-<span id="LC9" class="line" lang="plaintext">    • In the expression:</span>

</pre>

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10

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<pre style="margin: 0;">-<span id="LC10" class="line" lang="plaintext">          (\ x -> x) :: (forall a. a -> a) -> forall b. b -> b</span>

</pre>

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2

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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T10619.hs:10:14: error:</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="11" 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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3

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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext">    • Couldn't match type ‘p1’ with ‘forall a. a -> a’</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="11" 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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4

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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext">      Expected: (forall a. a -> a) -> forall b. b -> b</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="11" 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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5

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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext">        Actual: p1 -> p1</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="11" 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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6

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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext">      Cannot instantiate unification variable ‘p1’</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="11" 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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7

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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext">      with a type involving polytypes: forall a. a -> a</span>

</pre>

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8

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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext">    • In the expression: \ y -> y</span>

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<pre style="margin: 0;"> <span id="LC9" class="line" lang="plaintext">      In the expression:</span>

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<td class="diff-line-num new_line" data-linenumber="10" 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="LC10" class="line" lang="plaintext">        if True then</span>

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<pre style="margin: 0;"> <span id="LC11" class="line" lang="plaintext">            ((\ x -> x) :: (forall a. a -> a) -> forall b. b -> b)</span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="19" 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="17" 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">@@ -19,15 +17,13 @@ T10619.hs:9:15: error:</td>

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<pre style="margin: 0;"> <span id="LC17" class="line" lang="plaintext">                  ((\ x -> x) :: (forall a. a -> a) -> forall b. b -> b)</span>

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<pre style="margin: 0;"> <span id="LC18" class="line" lang="plaintext">              else</span>

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<td class="diff-line-num new_line" data-linenumber="19" 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="LC19" class="line" lang="plaintext">                  \ y -> y</span>

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<pre style="margin: 0;">-<span id="LC22" class="line" lang="plaintext">    • Relevant bindings include</span>

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<pre style="margin: 0;">-<span id="LC23" class="line" lang="plaintext">        foo :: p1 -> p -> p (bound at T10619.hs:8:1)</span>

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

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<pre style="margin: 0;"> <span id="LC21" class="line" lang="plaintext">T10619.hs:14:15: error:</span>

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<td class="diff-line-num new_line" data-linenumber="22" 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="LC22" class="line" lang="plaintext">    • Couldn't match type ‘p’ with ‘forall a. a -> a’</span>

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<pre style="margin: 0;"> <span id="LC23" class="line" lang="plaintext">      Expected: p -> p</span>

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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="plaintext">        Actual: (forall a. a -> a) -> forall b. b -> b</span>

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<td class="diff-line-num new_line" data-linenumber="25" 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="LC25" class="line" lang="plaintext">      ‘p’ is a rigid type variable bound by</span>

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<td class="diff-line-num new_line old" data-linenumber="26" 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="LC30" class="line" lang="plaintext">        the inferred type of bar :: p<span class="idiff left right">1</span> -> p -> p</span>

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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="plaintext">        the inferred type of bar :: p<span class="idiff left right">2</span> -> p -> p</span>

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<td class="diff-line-num new_line" data-linenumber="27" 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="LC27" class="line" lang="plaintext">        at T10619.hs:(12,1)-(14,66)</span>

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<td class="diff-line-num old_line" data-linenumber="32" 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="28" 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="LC28" class="line" lang="plaintext">    • In the expression:</span>

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<td class="diff-line-num old_line" data-linenumber="33" 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="29" 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="LC29" class="line" lang="plaintext">          (\ x -> x) :: (forall a. a -> a) -> forall b. b -> b</span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="43" 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="39" 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">@@ -43,21 +39,16 @@ T10619.hs:14:15: error:</td>

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<pre style="margin: 0;"> <span id="LC39" class="line" lang="plaintext">              else</span>

</pre>

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44

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<td class="diff-line-num new_line" data-linenumber="40" 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="LC40" class="line" lang="plaintext">                  ((\ x -> x) :: (forall a. a -> a) -> forall b. b -> b)</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="45" 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">

45

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<td class="diff-line-num new_line" data-linenumber="41" 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="LC41" class="line" lang="plaintext">    • Relevant bindings include</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="46" 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">

46

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<td class="diff-line-num new_line old" data-linenumber="42" 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="LC46" class="line" lang="plaintext">        bar :: p<span class="idiff left right">1</span> -> p -> p (bound at T10619.hs:12:1)</span>

</pre>

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<pre style="margin: 0;">+<span id="LC42" class="line" lang="plaintext">        bar :: p<span class="idiff left right">2</span> -> p -> p (bound at T10619.hs:12:1)</span>

</pre>

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47

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<td class="diff-line-num new_line" data-linenumber="43" 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="LC43" class="line" lang="plaintext"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="48" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="44" 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="LC48" class="line" lang="plaintext">T10619.hs:16:13: error:</span>

</pre>

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<td class="diff-line-num new_line old" data-linenumber="44" 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="LC49" class="line" lang="plaintext">    • Couldn't match type ‘p’ with ‘forall b. b -> b’</span>

</pre>

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<td class="diff-line-num new_line old" data-linenumber="44" 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="LC50" class="line" lang="plaintext">      Expected: p -> p</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="51" 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="LC51" class="line" lang="plaintext">        Actual: (forall a. a -> a) -> forall b. b -> b</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="52" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="44" 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="LC52" class="line" lang="plaintext">      ‘p’ is a rigid type variable bound by</span>

</pre>

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<td class="diff-line-num new_line old" data-linenumber="44" 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="LC53" class="line" lang="plaintext">        the inferred type of baz :: Bool -> p -> p</span>

</pre>

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<td class="diff-line-num new_line old" data-linenumber="44" 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="LC54" class="line" lang="plaintext">        at T10619.hs:(16,1)-(17,19)</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="55" 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">

55

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<td class="diff-line-num new_line old" data-linenumber="44" 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="LC55" class="line" lang="plaintext">    • In the expression:</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="56" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="44" 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="LC56" class="line" lang="plaintext">          (\ x -> x) :: (forall a. a -> a) -> forall b. b -> b</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="57" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="44" 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="LC57" class="line" lang="plaintext">      In an equation for ‘baz’:</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="58" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="44" 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="LC58" class="line" lang="plaintext">          baz True = (\ x -> x) :: (forall a. a -> a) -> forall b. b -> b</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="59" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="44" 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="LC59" class="line" lang="plaintext">    • Relevant bindings include</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="60" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<td class="diff-line-num new_line old" data-linenumber="44" 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="LC60" class="line" lang="plaintext">        baz :: Bool -> p -> p (bound at T10619.hs:16:1)</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="61" 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="44" 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="LC44" class="line" lang="plaintext">T10619.hs:17:13: error:</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="61" 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="45" 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="LC45" class="line" lang="plaintext">    • Couldn't match type ‘p0’ with ‘forall a. a -> a’</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="61" 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="46" 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="LC46" class="line" lang="plaintext">      Expected: (forall a. a -> a) -> forall b. b -> b</span>

</pre>

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<pre style="margin: 0;">+<span id="LC47" class="line" lang="plaintext">        Actual: p0 -> p0</span>

</pre>

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48

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<pre style="margin: 0;">+<span id="LC48" class="line" lang="plaintext">      Cannot instantiate unification variable ‘p0’</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="61" 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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49

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<pre style="margin: 0;">+<span id="LC49" class="line" lang="plaintext">      with a type involving polytypes: forall a. a -> a</span>

</pre>

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50

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<pre style="margin: 0;">+<span id="LC50" class="line" lang="plaintext">    • In the expression: \ y -> y</span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="51" 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">

51

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<pre style="margin: 0;">+<span id="LC51" class="line" lang="plaintext">      In an equation for ‘baz’: baz False = \ y -> y</span>

</pre>

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61

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52

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

</pre>

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62

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<pre style="margin: 0;"> <span id="LC53" class="line" lang="plaintext">T10619.hs:20:14: error:</span>

</pre>

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63

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<pre style="margin: 0;"> <span id="LC54" class="line" lang="plaintext">    • Couldn't match type ‘p’ with ‘forall a. a -> a’</span>

</pre>

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</table>

<br>

</li>

<li id="d11758f93287e3d88c519d06faf4c1e867e35202">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3ecd7b82c4ac35723d09b5e0eaf6b62808805b6e#d11758f93287e3d88c519d06faf4c1e867e35202"><strong>testsuite/tests/typecheck/should_fail/tcfail002.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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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">tcfail002.hs:4:7: error:</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 expected type ‘<span class="idiff left right">p’ with actual type ‘[p</span>]’</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 expected type ‘<span class="idiff left right">a’ with actual type ‘[a</span>]’</span>

</pre>

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4

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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext">    • In the expression: z</span>

</pre>

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5

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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext">      In an equation for ‘c’: c z = z</span>

</pre>

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6

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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext">    • Relevant bindings include</span>

</pre>

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<pre style="margin: 0;">-<span id="LC7" class="line" lang="plaintext">        z :: [<span class="idiff left right">p</span>] (bound at tcfail002.hs:4:3)</span>

</pre>

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8

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<pre style="margin: 0;">-<span id="LC8" class="line" lang="plaintext">        c :: [<span class="idiff left right">p] -> p</span> (bound at tcfail002.hs:3:1)</span></pre>

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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext">        z :: [<span class="idiff left right">a</span>] (bound at tcfail002.hs:4:3)</span>

</pre>

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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext">        c :: [<span class="idiff left right">a] -> a</span> (bound at tcfail002.hs:3:1)</span></pre>

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<br>

</li>

<li id="f0e03fefede81fd3a2760698eb1cbcfd7415f58d">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3ecd7b82c4ac35723d09b5e0eaf6b62808805b6e#f0e03fefede81fd3a2760698eb1cbcfd7415f58d"><strong>testsuite/tests/typecheck/should_fail/tcfail104.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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<td class="diff-line-num new_line old" data-linenumber="2" 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="LC2" class="line" lang="plaintext">tcfail104.hs:14:12: error:</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="3" 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="2" 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">

2

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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="LC2" class="line" lang="plaintext">tcfail104.hs:16:12: error:</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="3" 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="3" 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">

3

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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="LC3" class="line" lang="plaintext">    • Couldn't match type: Char -> Char</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="3" 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="4" 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">

4

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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext">                     with: forall a. a -> a</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="3" 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="5" 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">

5

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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext">      Expected: (forall a. a -> a) -> Char -> Char</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="3" 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="6" 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">

6

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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext">        Actual: (Char -> Char) -> Char -> Char</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="3" 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="7" 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">

7

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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext">    • In the expression: \ x -> x</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="3" 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="8" 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">

8

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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="LC8" class="line" lang="plaintext">      In the expression:</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="3" 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="9" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

9

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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext">        if v then (\ (x :: forall a. a -> a) -> x) else (\ x -> x)</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="3" 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="10" 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">

10

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

</pre>

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<td class="diff-line-num new old_line" data-linenumber="3" 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="11" 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">

11

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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext">        (if v then (\ (x :: forall a. a -> a) -> x) else (\ x -> x)) id 'c'</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="3" 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="12" 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">

12

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

</pre>

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<td class="diff-line-num new old_line" data-linenumber="3" 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="13" 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">

13

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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext">tcfail104.hs:22:12: error:</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="3" 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">

3

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<td class="diff-line-num new_line" data-linenumber="14" 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">

14

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<pre style="margin: 0;"> <span id="LC14" class="line" lang="plaintext">    • Couldn't match type: forall a. a -> a</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="4" 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">

4

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<td class="diff-line-num new_line" data-linenumber="15" 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">

15

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

<pre style="margin: 0;"> <span id="LC15" class="line" lang="plaintext">                     with: Char -> Char</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="5" 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">

5

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<td class="diff-line-num new_line" data-linenumber="16" 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">

16

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

<pre style="margin: 0;"> <span id="LC16" class="line" lang="plaintext">      Expected: (Char -> Char) -> Char -> Char</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="6" 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">

6

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<td class="diff-line-num new_line" data-linenumber="17" 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">

17

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<pre style="margin: 0;"> <span id="LC17" class="line" lang="plaintext">        Actual: (forall a. a -> a) -> Char -> Char</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="7" 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">

7

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<td class="diff-line-num new_line" data-linenumber="18" 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">

18

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<pre style="margin: 0;"> <span id="LC18" class="line" lang="plaintext">    • In the expression: \ (x :: forall a. a -> a) -> x</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="8" 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">

8

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<td class="diff-line-num new_line" data-linenumber="19" 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">

19

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<pre style="margin: 0;"> <span id="LC19" class="line" lang="plaintext">      In the expression:</span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="9" 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">

9

</td>

<td class="diff-line-num new_line old" data-linenumber="20" 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="LC9" class="line" lang="plaintext">        if v then (\ <span class="idiff left right">(x :: forall a. a -> a) -> x) else (\ x</span> -> x)</span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="10" 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="20" 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">

20

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<pre style="margin: 0;">+<span id="LC20" class="line" lang="plaintext">        if v then (\ <span class="idiff left right">x -> x) else (\ (x :: forall a. a -> a)</span> -> x)</span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="10" 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">

10

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<td class="diff-line-num 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">

21

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<pre style="margin: 0;"> <span id="LC21" class="line" lang="plaintext">      In the expression:</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="11" 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">

11

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<td class="diff-line-num new_line old" data-linenumber="22" 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="LC11" class="line" lang="plaintext">        (if v then (\ (x :: forall a. a -> a) -> x) else (\ x -> x)) id 'c'</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="12" 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">

12

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<td class="diff-line-num new_line old" data-linenumber="22" 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"></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="13" 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">

13

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<td class="diff-line-num new_line old" data-linenumber="22" 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="LC13" class="line" lang="plaintext">tcfail104.hs:22:15: error:</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="14" 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">

14

</td>

<td class="diff-line-num new_line old" data-linenumber="22" 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="LC14" class="line" lang="plaintext">    • Couldn't match expected type: Char -> Char</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="15" 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">

15

</td>

<td class="diff-line-num new_line old" data-linenumber="22" 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="LC15" class="line" lang="plaintext">                  with actual type: forall a. a -> a</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="16" 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">

16

</td>

<td class="diff-line-num new_line old" data-linenumber="22" 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="LC16" class="line" lang="plaintext">    • When checking that the pattern signature: forall a. a -> a</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="17" 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">

17

</td>

<td class="diff-line-num new_line old" data-linenumber="22" 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="LC17" class="line" lang="plaintext">        fits the type of its context: Char -> Char</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="18" 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">

18

</td>

<td class="diff-line-num new_line old" data-linenumber="22" 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="LC18" class="line" lang="plaintext">      In the pattern: x :: forall a. a -> a</span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="19" 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">

19

</td>

<td class="diff-line-num new_line old" data-linenumber="22" 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="LC19" class="line" lang="plaintext">      In the expression: \ (x :: forall a. a -> a) -> x</span></pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="20" 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="22" 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">

22

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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="LC22" class="line" lang="plaintext">        (if v then (\ x -> x) else (\ (x :: forall a. a -> a) -> x)) id 'c'</span></pre>

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