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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/835b5d0ef18db26e93e355e55928059c86f8a688">835b5d0e</a></strong>

<div>

<span>by Simon Peyton Jones</span>

<i>at 2020-07-13T23:00:00+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] in TcMType

Other refactoring:

- Move all the InferResult code to one place, in GHC.Tc.Utils.TcMType

  (previously some of it was in Unify)

- Move tcInstType and friends from TcMType to Instantiate, where it

  more properly belongs.  (TCMType was getting very long.)

</pre>

</li>

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<h4>20 changed files:</h4>

<ul>

<li class="file-stats">

<a href="#578c7c3857d66d963736ff6742f3433a0e8d01b7">

compiler/GHC/Core/TyCo/Rep.hs

</a>

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<li class="file-stats">

<a href="#84c9d3ba34173297e7d7747e02caa2e004b164fc">

compiler/GHC/Core/Type.hs

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<li class="file-stats">

<a href="#f157d5c316465070f94641e4c9ab0248311588cd">

compiler/GHC/Core/UsageEnv.hs

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<li class="file-stats">

<a href="#902811828741e6bcd64702935bbb54edbbd070ef">

compiler/GHC/Tc/Gen/Expr.hs

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<li class="file-stats">

<a href="#3377164bfe9a1f1a8cfd588703ae1e0ea1e91cf9">

compiler/GHC/Tc/Gen/Match.hs

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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="#eade747fa0a15693c67617629e286714fce958e4">

compiler/GHC/Tc/Gen/Sig.hs

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<li class="file-stats">

<a href="#aebe2c3d616f6843166d2657bed048898add6bc9">

compiler/GHC/Tc/Instance/Class.hs

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<li class="file-stats">

<a href="#07389a8f0516c26409d86f6bb651ed00759b5d4c">

compiler/GHC/Tc/Instance/Family.hs

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<li class="file-stats">

<a href="#dd8bbe6a21866e4f574f4796b7ad19de17564072">

compiler/GHC/Tc/TyCl/Class.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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<li class="file-stats">

<a href="#5461e7beeb7ae73d7c01f720cbaa3fa2c5333590">

compiler/GHC/Tc/Utils/TcType.hs

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<li class="file-stats">

<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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<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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<li class="file-stats">

<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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<h4>Changes:</h4>

<li id="578c7c3857d66d963736ff6742f3433a0e8d01b7">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/835b5d0ef18db26e93e355e55928059c86f8a688#578c7c3857d66d963736ff6742f3433a0e8d01b7"><strong>compiler/GHC/Core/TyCo/Rep.hs</strong></a>

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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -19,7 +19,7 @@ Note [The Type-related module hierarchy]</td>

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

</pre>

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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, <span class="idiff left right">DeriveDataTypeable, MultiWayIf, PatternSynonyms, BangPatterns</span> #-}</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, <span class="idiff left right">MultiWayIf, PatternSynonyms, BangPatterns, DeriveDataTypeable</span> #-}</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC24" 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="LC25" 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="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="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2025,6 +2025,12 @@ GHC.Core.Multiplicity above this module.</td>

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<pre style="margin: 0;"> <span id="LC2025" 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="LC2026" 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="LC2027" 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="LC2028" 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>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="2029" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

2029

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<pre style="margin: 0;">+<span id="LC2029" 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>

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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

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<pre style="margin: 0;">+<span id="LC2030" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- to accidentally lift functions (substitutions, zonking etc.) from</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="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;">-- Type -> Type to Scaled Type -> Scaled Type, ignoring</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="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

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<pre style="margin: 0;">+<span id="LC2032" 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">

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<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>

</pre>

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2028

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<td class="diff-line-num new_line" data-linenumber="2034" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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="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="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 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

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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="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="84c9d3ba34173297e7d7747e02caa2e004b164fc">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/835b5d0ef18db26e93e355e55928059c86f8a688#84c9d3ba34173297e7d7747e02caa2e004b164fc"><strong>compiler/GHC/Core/Type.hs</strong></a>

<hr>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="48" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="48" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -48,7 +48,7 @@ module GHC.Core.Type (</td>

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<td class="diff-line-num old_line" data-linenumber="48" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

48

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48

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<pre style="margin: 0;"> <span id="LC48" class="line" lang="haskell">        <span class="nf" style="color: #900; font-weight: 600;">mkSpecForAllTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkSpecForAllTys</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="49" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

49

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<td class="diff-line-num new_line" data-linenumber="49" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

49

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<pre style="margin: 0;"> <span id="LC49" class="line" lang="haskell">        <span class="nf" style="color: #900; font-weight: 600;">mkVisForAllTys</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkTyCoInvForAllTy</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="50" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

50

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<td class="diff-line-num new_line" data-linenumber="50" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

50

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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell">        <span class="nf" style="color: #900; font-weight: 600;">mkInfForAllTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkInfForAllTys</span><span class="p">,</span></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">

51

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<td class="diff-line-num new_line old" 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="haskell">        <span class="nf" style="color: #900; font-weight: 600;">splitForAllTys</span><span class="p">,</span><span class="idiff left"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">splitSomeForAllTys</span></span><span class="p"><span class="idiff right">,</span></span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="52" style="width: 35px; color: rgba(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="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="haskell">        <span class="nf" style="color: #900; font-weight: 600;">splitForAllTys</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="52" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

52

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<td class="diff-line-num new_line" data-linenumber="52" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

52

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<pre style="margin: 0;"> <span id="LC52" class="line" lang="haskell">        <span class="nf" style="color: #900; font-weight: 600;">splitForAllTysReq</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">splitForAllTysInvis</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="53" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

53

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<td class="diff-line-num new_line" data-linenumber="53" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

53

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<pre style="margin: 0;"> <span id="LC53" class="line" lang="haskell">        <span class="nf" style="color: #900; font-weight: 600;">splitForAllVarBndrs</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="54" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

54

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<td class="diff-line-num new_line" data-linenumber="54" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

54

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<pre style="margin: 0;"> <span id="LC54" class="line" lang="haskell">        <span class="nf" style="color: #900; font-weight: 600;">splitForAllTy_maybe</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">splitForAllTy</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="284" style="width: 35px; color: rgba(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="284" style="width: 35px; color: rgba(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">@@ -284,7 +284,7 @@ import GHC.Data.List.SetOps</td>

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<pre style="margin: 0;"> <span id="LC284" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Unique</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">nonDetCmpUnique</span> <span class="p">)</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC285" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;"> <span id="LC286" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.Maybe</span>   <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">orElse</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">expectJust</span> <span class="p">)</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC287" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Maybe</span>       <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">isJust</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">mapMaybe</span></span> <span class="p">)</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC287" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Maybe</span>       <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">isJust</span> <span class="p">)</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC288" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Monad</span>    <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">guard</span> <span class="p">)</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC289" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;"> <span id="LC290" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- $type_classification</span></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1526" style="width: 35px; color: rgba(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">@@ -1526,46 +1526,34 @@ splitForAllTys ty = split ty ty []</td>

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<pre style="margin: 0;"> <span id="LC1526" class="line" lang="haskell">    <span class="n" style="color: #333;">split</span> <span class="n" style="color: #333;">orig_ty</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">tvs</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">ty'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">coreView</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">split</span> <span class="n" style="color: #333;">orig_ty</span> <span class="n" style="color: #333;">ty'</span> <span class="n" style="color: #333;">tvs</span></span>

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<pre style="margin: 0;"> <span id="LC1527" class="line" lang="haskell">    <span class="n" style="color: #333;">split</span> <span class="n" style="color: #333;">orig_ty</span> <span class="kr" style="font-weight: 600;">_</span>                            <span class="n" style="color: #333;">tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">reverse</span> <span class="n" style="color: #333;">tvs</span><span class="p">,</span> <span class="n" style="color: #333;">orig_ty</span><span class="p">)</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC1528" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">-<span id="LC1529" class="line" lang="haskell"><span class="cd">-- | Like 'splitForAllTys', but only splits a 'ForAllTy' if @argf_pred argf@</span></span>

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<pre style="margin: 0;">-<span id="LC1530" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- is 'True', where @argf@ is the visibility of the @ForAllTy@'s binder and</span></span>

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<pre style="margin: 0;">-<span id="LC1531" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @argf_pred@ is a predicate over visibilities provided as an argument to this</span></span>

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<pre style="margin: 0;">-<span id="LC1532" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- function. Furthermore, each returned tyvar is annotated with its @argf@.</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC1533" class="line" lang="haskell"><span class="n" style="color: #333;">splitSomeForAllTys</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ArgFlag</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">TyCoVarBinder</span><span class="p">],</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="LC1529" class="line" lang="haskell"><span class="cd">-- | Splits the longest initial sequence of ForAllTys' that satisfy</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC1530" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @argf_pred@, returning the binders transformed by @argf_pred@</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="1531" style="width: 35px; color: rgba(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="LC1531" class="line" lang="haskell"><span class="n" style="color: #333;">splitSomeForAllTys</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ArgFlag</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">af</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">VarBndr</span> <span class="kt" style="color: #458; font-weight: 600;">TyCoVar</span> <span class="n" style="color: #333;">af</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC1532" class="line" lang="haskell"><span class="n" style="color: #333;">splitSomeForAllTys</span> <span class="n" style="color: #333;">argf_pred</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">split</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">ty</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>

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1535

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<pre style="margin: 0;"> <span id="LC1533" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC1536" class="line" lang="haskell">    <span class="n" style="color: #333;">split</span> <span class="kr" style="font-weight: 600;">_</span> <span class="idiff left">      </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">ForAllTy</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tvb</span></span><span class="o" style="font-weight: 600;"><span class="idiff">@</span></span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Bndr</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff right">_</span></span> <span class="n" style="color: #333;">argf</span><span class="p">)</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="n" style="color: #333;">tvs</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC1537" class="line" lang="haskell">      <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;"><span class="idiff left">argf_pred</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">argf</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">split</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">tvb</span></span><span class="o" style="font-weight: 600;"><span class="idiff right">:</span></span><span class="n" style="color: #333;">tvs</span><span class="p">)</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC1534" class="line" lang="haskell">    <span class="n" style="color: #333;">split</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">ForAllTy</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">Bndr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">tcv</span></span> <span class="n" style="color: #333;">argf</span><span class="p">)</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="n" style="color: #333;">tvs</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC1535" class="line" lang="haskell">      <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Just</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">argf'</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">argf_pred</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">argf</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">split</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty</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">Bndr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tcv</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">argf'</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">:</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">tvs</span><span class="p">)</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC1536" class="line" lang="haskell">    <span class="n" style="color: #333;">split</span> <span class="n" style="color: #333;">orig_ty</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">tvs</span> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">ty'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">coreView</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">split</span> <span class="n" style="color: #333;">orig_ty</span> <span class="n" style="color: #333;">ty'</span> <span class="n" style="color: #333;">tvs</span></span>

</pre>

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1537

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<pre style="margin: 0;"> <span id="LC1537" class="line" lang="haskell">    <span class="n" style="color: #333;">split</span> <span class="n" style="color: #333;">orig_ty</span> <span class="kr" style="font-weight: 600;">_</span>                            <span class="n" style="color: #333;">tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">reverse</span> <span class="n" style="color: #333;">tvs</span><span class="p">,</span> <span class="n" style="color: #333;">orig_ty</span><span class="p">)</span></span>

</pre>

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1540

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<td class="diff-line-num new_line" data-linenumber="1538" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1538

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<pre style="margin: 0;"> <span id="LC1538" class="line" lang="haskell"></span>

</pre>

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1541

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<pre style="margin: 0;"> <span id="LC1539" class="line" lang="haskell"><span class="cd">-- | Like 'splitForAllTys', but only splits 'ForAllTy's with 'Required' type</span></span>

</pre>

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1542

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<pre style="margin: 0;"> <span id="LC1540" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- variable binders. Furthermore, each returned tyvar is annotated with '()'.</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC1541" class="line" lang="haskell"><span class="n" style="color: #333;">splitForAllTysReq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">ReqTVBinder</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1544" 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">

1544

</td>

<td class="diff-line-num new_line old" data-linenumber="1542" 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="LC1544" class="line" lang="haskell"><span class="n" style="color: #333;">splitForAllTysReq</span> <span class="n" style="color: #333;">ty</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="1545" 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">

1545

</td>

<td class="diff-line-num new_line old" data-linenumber="1542" 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="LC1545" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">all_bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">body</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitSomeForAllTys</span> <span class="n" style="color: #333;">isVisibleArgFlag</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="1546" 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">

1546

</td>

<td class="diff-line-num new_line old" data-linenumber="1542" 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="LC1546" class="line" lang="haskell">      <span class="n" style="color: #333;">req_bndrs</span>         <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapMaybe</span> <span class="n" style="color: #333;">mk_req_bndr_maybe</span> <span class="n" style="color: #333;">all_bndrs</span> <span class="kr" style="font-weight: 600;">in</span></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="1547" 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">

1547

</td>

<td class="diff-line-num new_line old" data-linenumber="1542" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC1547" class="line" lang="haskell">  <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">req_bndrs</span> <span class="p">`</span><span class="n" style="color: #333;">equalLength</span><span class="p">`</span> <span class="n" style="color: #333;">all_bndrs</span> <span class="p">)</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1548" 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">

1548

</td>

<td class="diff-line-num new_line old" data-linenumber="1542" 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="LC1548" class="line" lang="haskell">  <span class="p">(</span><span class="n" style="color: #333;">req_bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">body</span><span class="p">)</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1549" style="width: 35px; color: rgba(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="1542" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1542

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<pre style="margin: 0;">+<span id="LC1542" class="line" lang="haskell"><span class="n" style="color: #333;">splitForAllTysReq</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitSomeForAllTys</span> <span class="n" style="color: #333;">argf_pred</span> <span class="n" style="color: #333;">ty</span></span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="1549" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1549

</td>

<td class="diff-line-num new_line" data-linenumber="1543" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1543

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<pre style="margin: 0;"> <span id="LC1543" 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="1550" 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">

1550

</td>

<td class="diff-line-num new_line old" data-linenumber="1544" 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="LC1550" class="line" lang="haskell">    <span class="n" style="color: #333;">mk_req_bndr_maybe</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCoVarBinder</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">ReqTVBinder</span></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="1551" 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">

1551

</td>

<td class="diff-line-num new_line old" data-linenumber="1544" 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="LC1551" class="line" lang="haskell">    <span class="n" style="color: #333;">mk_req_bndr_maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Bndr</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">argf</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">argf</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="1552" 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">

1552

</td>

<td class="diff-line-num new_line old" data-linenumber="1544" 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="LC1552" class="line" lang="haskell">      <span class="kt" style="color: #458; font-weight: 600;">Required</span>    <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">Bndr</span> <span class="n" style="color: #333;">tv</span> <span class="nb" style="color: #0086b3;">()</span></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="1553" 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">

1553

</td>

<td class="diff-line-num new_line old" data-linenumber="1544" 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="LC1553" class="line" lang="haskell">      <span class="kt" style="color: #458; font-weight: 600;">Invisible</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>

</pre>

</td>

</tr>

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

<td class="diff-line-num new old_line" data-linenumber="1554" style="width: 35px; color: rgba(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="1544" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1544

</td>

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

<pre style="margin: 0;">+<span id="LC1544" class="line" lang="haskell">    <span class="n" style="color: #333;">argf_pred</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ArgFlag</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="nb" style="color: #0086b3;">()</span></span>

</pre>

</td>

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

<td class="diff-line-num new old_line" data-linenumber="1554" style="width: 35px; color: rgba(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="1545" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1545

</td>

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

<pre style="margin: 0;">+<span id="LC1545" class="line" lang="haskell">    <span class="n" style="color: #333;">argf_pred</span> <span class="kt" style="color: #458; font-weight: 600;">Required</span>       <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="nb" style="color: #0086b3;">()</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="1554" style="width: 35px; color: rgba(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="1546" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1546

</td>

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

<pre style="margin: 0;">+<span id="LC1546" class="line" lang="haskell">    <span class="n" style="color: #333;">argf_pred</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Invisible</span> <span class="p">{})</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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<tr class="line_holder" id="" style="line-height: 1.6;">

<td class="diff-line-num old_line" data-linenumber="1554" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1554

</td>

<td class="diff-line-num new_line" data-linenumber="1547" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1547

</td>

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

<pre style="margin: 0;"> <span id="LC1547" class="line" lang="haskell"></span>

</pre>

</td>

</tr>

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

<td class="diff-line-num old_line" data-linenumber="1555" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1555

</td>

<td class="diff-line-num new_line" data-linenumber="1548" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1548

</td>

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

<pre style="margin: 0;"> <span id="LC1548" class="line" lang="haskell"><span class="cd">-- | Like 'splitForAllTys', but only splits 'ForAllTy's with 'Invisible' type</span></span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="1556" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1556

</td>

<td class="diff-line-num new_line" data-linenumber="1549" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1549

</td>

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<pre style="margin: 0;"> <span id="LC1549" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- variable binders. Furthermore, each returned tyvar is annotated with its</span></span>

</pre>

</td>

</tr>

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

<td class="diff-line-num old_line" data-linenumber="1557" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1557

</td>

<td class="diff-line-num new_line" data-linenumber="1550" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1550

</td>

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

<pre style="margin: 0;"> <span id="LC1550" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'Specificity'.</span></span>

</pre>

</td>

</tr>

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

<td class="diff-line-num old_line" data-linenumber="1558" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1558

</td>

<td class="diff-line-num new_line" data-linenumber="1551" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1551

</td>

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

<pre style="margin: 0;"> <span id="LC1551" class="line" lang="haskell"><span class="n" style="color: #333;">splitForAllTysInvis</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">InvisTVBinder</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span></span>

</pre>

</td>

</tr>

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

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

1559

</td>

<td class="diff-line-num new_line old" data-linenumber="1552" 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="LC1559" class="line" lang="haskell"><span class="n" style="color: #333;">splitForAllTysInvis</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span></span>

</pre>

</td>

</tr>

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

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

1560

</td>

<td class="diff-line-num new_line old" data-linenumber="1552" 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="LC1560" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">all_bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">body</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitSomeForAllTys</span> <span class="n" style="color: #333;">isInvisibleArgFlag</span> <span class="n" style="color: #333;">ty</span></span>

</pre>

</td>

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

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

1561

</td>

<td class="diff-line-num new_line old" data-linenumber="1552" 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="LC1561" class="line" lang="haskell">      <span class="n" style="color: #333;">inv_bndrs</span>         <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapMaybe</span> <span class="n" style="color: #333;">mk_inv_bndr_maybe</span> <span class="n" style="color: #333;">all_bndrs</span> <span class="kr" style="font-weight: 600;">in</span></span>

</pre>

</td>

</tr>

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

<td class="diff-line-num old old_line" data-linenumber="1562" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

1562

</td>

<td class="diff-line-num new_line old" data-linenumber="1552" 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="LC1562" class="line" lang="haskell">  <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">inv_bndrs</span> <span class="p">`</span><span class="n" style="color: #333;">equalLength</span><span class="p">`</span> <span class="n" style="color: #333;">all_bndrs</span> <span class="p">)</span></span>

</pre>

</td>

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

<td class="diff-line-num old old_line" data-linenumber="1563" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

1563

</td>

<td class="diff-line-num new_line old" data-linenumber="1552" 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="LC1563" class="line" lang="haskell">  <span class="p">(</span><span class="n" style="color: #333;">inv_bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">body</span><span class="p">)</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="1564" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1552" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1552

</td>

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

<pre style="margin: 0;">+<span id="LC1552" class="line" lang="haskell"><span class="n" style="color: #333;">splitForAllTysInvis</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitSomeForAllTys</span> <span class="n" style="color: #333;">argf_pred</span> <span class="n" style="color: #333;">ty</span></span>

</pre>

</td>

</tr>

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

<td class="diff-line-num old_line" data-linenumber="1564" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1564

</td>

<td class="diff-line-num new_line" data-linenumber="1553" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1553

</td>

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

<pre style="margin: 0;"> <span id="LC1553" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

</td>

</tr>

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

<td class="diff-line-num old old_line" data-linenumber="1565" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

1565

</td>

<td class="diff-line-num new_line old" data-linenumber="1554" 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="LC1565" class="line" lang="haskell">    <span class="n" style="color: #333;">mk_inv_bndr_maybe</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCoVarBinder</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">InvisTVBinder</span></span>

</pre>

</td>

</tr>

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

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

1566

</td>

<td class="diff-line-num new_line old" data-linenumber="1554" 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="LC1566" class="line" lang="haskell">    <span class="n" style="color: #333;">mk_inv_bndr_maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Bndr</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">argf</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">argf</span> <span class="kr" style="font-weight: 600;">of</span></span>

</pre>

</td>

</tr>

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

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

1567

</td>

<td class="diff-line-num new_line old" data-linenumber="1554" 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="LC1567" class="line" lang="haskell">      <span class="kt" style="color: #458; font-weight: 600;">Invisible</span> <span class="n" style="color: #333;">s</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">Bndr</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">s</span></span>

</pre>

</td>

</tr>

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

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

1568

</td>

<td class="diff-line-num new_line old" data-linenumber="1554" 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="LC1568" class="line" lang="haskell">      <span class="kt" style="color: #458; font-weight: 600;">Required</span>    <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</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="1569" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1554" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1554

</td>

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

<pre style="margin: 0;">+<span id="LC1554" class="line" lang="haskell">    <span class="n" style="color: #333;">argf_pred</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">ArgFlag</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">Specificity</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="1569" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1555" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1555

</td>

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

<pre style="margin: 0;">+<span id="LC1555" class="line" lang="haskell">    <span class="n" style="color: #333;">argf_pred</span> <span class="kt" style="color: #458; font-weight: 600;">Required</span>         <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</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="1569" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1556" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1556

</td>

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

<pre style="margin: 0;">+<span id="LC1556" class="line" lang="haskell">    <span class="n" style="color: #333;">argf_pred</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Invisible</span> <span class="n" style="color: #333;">spec</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">spec</span></span>

</pre>

</td>

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1557

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<pre style="margin: 0;"> <span id="LC1557" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;"> <span id="LC1558" class="line" lang="haskell"><span class="cd">-- | Like splitForAllTys, but split only for tyvars.</span></span>

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1571

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<pre style="margin: 0;"> <span id="LC1559" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This always succeeds, even if it returns only an empty list. Note that the</span></span>

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<li id="f157d5c316465070f94641e4c9ab0248311588cd">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/835b5d0ef18db26e93e355e55928059c86f8a688#f157d5c316465070f94641e4c9ab0248311588cd"><strong>compiler/GHC/Core/UsageEnv.hs</strong></a>

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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>

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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>

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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>

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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>

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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>

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

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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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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>

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<li id="902811828741e6bcd64702935bbb54edbbd070ef">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/835b5d0ef18db26e93e355e55928059c86f8a688#902811828741e6bcd64702935bbb54edbbd070ef"><strong>compiler/GHC/Tc/Gen/Expr.hs</strong></a>

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

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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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<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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<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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<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>

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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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612

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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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<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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<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">

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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>

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<pre style="margin: 0;">-<span id="LC619" class="line" lang="haskell"></span>

</pre>

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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>

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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>

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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>

</pre>

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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">

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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/835b5d0ef18db26e93e355e55928059c86f8a688#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>

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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 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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<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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<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">

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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 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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<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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<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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<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">

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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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<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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<td class="diff-line-num old old_line" data-linenumber="176" 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="LC176" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider</span></span>

</pre>

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

</pre>

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<td class="diff-line-num old old_line" data-linenumber="178" 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">

178

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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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<td class="diff-line-num old old_line" data-linenumber="179" 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">

179

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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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<td class="diff-line-num old old_line" data-linenumber="180" 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">

180

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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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<td class="diff-line-num old old_line" data-linenumber="183" 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">

183

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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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<td class="diff-line-num old old_line" data-linenumber="184" 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">

184

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<td class="diff-line-num new_line old" data-linenumber="171" 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="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">

185

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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">

186

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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">

187

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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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<td class="diff-line-num old old_line" data-linenumber="188" 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">

188

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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">

189

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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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<td class="diff-line-num old old_line" data-linenumber="192" 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="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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<td class="diff-line-num old old_line" data-linenumber="193" 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="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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<td class="diff-line-num old old_line" data-linenumber="194" 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="LC194" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="195" 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">

195

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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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<td class="diff-line-num old old_line" data-linenumber="196" 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">

196

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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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<td class="diff-line-num old old_line" data-linenumber="197" 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">

197

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<td class="diff-line-num new_line old" data-linenumber="171" 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="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>

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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>

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

</pre>

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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>

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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>

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

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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>

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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>

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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>

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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>

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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>

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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>

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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>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="174" style="width: 35px; color: rgba(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="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>

</pre>

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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">

175

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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>

</pre>

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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="176" style="width: 35px; color: rgba(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="LC176" class="line" lang="haskell">                                           <span class="c1" style="color: #998; font-style: italic;">-- an alternative</span></span>

</pre>

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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="177" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

177

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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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<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="178" style="width: 35px; color: rgba(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="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>

</pre>

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<td class="diff-line-num old_line" data-linenumber="215" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

215

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179

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

</pre>

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<td class="diff-line-num old_line" data-linenumber="216" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

216

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<td class="diff-line-num new_line" data-linenumber="180" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

180

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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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<td class="diff-line-num old_line" data-linenumber="217" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

217

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<td class="diff-line-num new_line" data-linenumber="181" style="width: 35px; color: rgba(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="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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<td class="diff-line-num old_line" data-linenumber="218" style="width: 35px; color: rgba(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="182" style="width: 35px; color: rgba(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="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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<td class="diff-line-num old old_line" data-linenumber="219" 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="183" 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="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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<td class="diff-line-num old_line" data-linenumber="220" style="width: 35px; color: rgba(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="184" style="width: 35px; color: rgba(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="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>

</pre>

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<td class="diff-line-num new_line" data-linenumber="185" style="width: 35px; color: rgba(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="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>

</pre>

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<td class="diff-line-num new_line" data-linenumber="186" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

186

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

</pre>

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<td class="diff-line-num old old_line" data-linenumber="223" 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="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="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>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="224" 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="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="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>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="225" 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="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>

</pre>

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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>

</pre>

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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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<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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<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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<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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<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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<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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<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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<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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<td class="diff-line-num new old_line" data-linenumber="235" style="width: 35px; color: rgba(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="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>

</pre>

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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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<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>

</pre>

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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>

</pre>

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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>

</pre>

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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>

</pre>

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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/835b5d0ef18db26e93e355e55928059c86f8a688#3ee8be814b6c6727880deab3772e6af922524bf0"><strong>compiler/GHC/Tc/Gen/Pat.hs</strong></a>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="220" style="width: 35px; color: rgba(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="220" style="width: 35px; color: rgba(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">@@ -220,8 +220,9 @@ tcPatBndr penv@(PE { pe_ctxt = LetPat { pc_lvl    = bind_lvl</td>

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<pre style="margin: 0;"> <span id="LC220" 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;">co</span><span class="p">,</span> <span class="n" style="color: #333;">bndr_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">scaledThing</span> <span class="n" style="color: #333;">exp_pat_ty</span> <span class="kr" style="font-weight: 600;">of</span></span>

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<pre style="margin: 0;"> <span id="LC221" class="line" lang="haskell">             <span class="kt" style="color: #458; font-weight: 600;">Check</span> <span class="n" style="color: #333;">pat_ty</span>    <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">promoteTcType</span> <span class="n" style="color: #333;">bind_lvl</span> <span class="n" style="color: #333;">pat_ty</span></span>

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<pre style="margin: 0;"> <span id="LC222" class="line" lang="haskell">             <span class="kt" style="color: #458; font-weight: 600;">Infer</span> <span class="n" style="color: #333;">infer_res</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">bind_lvl</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">ir_lvl</span> <span class="n" style="color: #333;">infer_res</span> <span class="p">)</span></span>

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<pre style="margin: 0;">-<span id="LC223" class="line" lang="haskell">                                <span class="c1" style="color: #998; font-style: italic;">-- If we were under a constructor that bumped</span></span>

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<pre style="margin: 0;">-<span id="LC224" class="line" lang="haskell">                                <span class="c1" style="color: #998; font-style: italic;">-- the level, we'd be in checking mode</span></span>

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<pre style="margin: 0;">+<span id="LC223" class="line" lang="haskell">                                <span class="c1" style="color: #998; font-style: italic;">-- If we were under a constructor that bumped the</span></span>

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<pre style="margin: 0;">+<span id="LC224" class="line" lang="haskell">                                <span class="c1" style="color: #998; font-style: italic;">-- level, we'd be in checking mode (see tcConArg)</span></span>

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<pre style="margin: 0;">+<span id="LC225" class="line" lang="haskell">                                <span class="c1" style="color: #998; font-style: italic;">-- hence this assertion</span></span>

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<pre style="margin: 0;"> <span id="LC226" class="line" lang="haskell">                                <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">bndr_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">inferResultToType</span> <span class="n" style="color: #333;">infer_res</span></span>

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<pre style="margin: 0;"> <span id="LC227" 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;">mkTcNomReflCo</span> <span class="n" style="color: #333;">bndr_ty</span><span class="p">,</span> <span class="n" style="color: #333;">bndr_ty</span><span class="p">)</span> <span class="p">}</span></span>

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<pre style="margin: 0;"> <span id="LC228" class="line" lang="haskell">       <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">bndr_mult</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">scaledMult</span> <span class="n" style="color: #333;">exp_pat_ty</span></span>

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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="630" style="width: 35px; color: rgba(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">@@ -629,10 +630,9 @@ There are two bits of rebindable syntax:</td>

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<pre style="margin: 0;"> <span id="LC630" 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="LC631" 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="LC632" 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="LC633" 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>

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<pre style="margin: 0;">+<span id="LC634" 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="LC635" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">expTypeToType on pat_ty before proceeding.</span></span>

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<pre style="margin: 0;"> <span id="LC636" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC637" 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>

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<pre style="margin: 0;"> <span id="LC638" 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>

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<br>

</li>

<li id="eade747fa0a15693c67617629e286714fce958e4">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/835b5d0ef18db26e93e355e55928059c86f8a688#eade747fa0a15693c67617629e286714fce958e4"><strong>compiler/GHC/Tc/Gen/Sig.hs</strong></a>

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<pre style="margin: 0;"> <span id="LC36" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.TcMType</span></span>

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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Validity</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">checkValidType</span> <span class="p">)</span></span>

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<pre style="margin: 0;"> <span id="LC38" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Unify</span><span class="p">(</span> <span class="n" style="color: #333;">tcSkolemise</span><span class="p">,</span> <span class="n" style="color: #333;">unifyType</span> <span class="p">)</span></span>

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<pre style="margin: 0;">-<span id="LC39" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Instantiate</span><span class="p">(</span> <span class="n" style="color: #333;">topInstantiate</span> <span class="p">)</span></span>

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<pre style="margin: 0;">+<span id="LC39" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Instantiate</span><span class="p">(</span> <span class="n" style="color: #333;">topInstantiate</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">tcInstTypeBndrs</span></span> <span class="p">)</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Env</span><span class="p">(</span> <span class="n" style="color: #333;">tcLookupId</span> <span class="p">)</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types.Evidence</span><span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">HsWrapper</span><span class="p">,</span> <span class="p">(</span><span class="o" style="font-weight: 600;"><.></span><span class="p">)</span> <span class="p">)</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC42" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Type</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">mkTyVarBinders</span> <span class="p">)</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="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="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -488,7 +488,7 @@ tcInstSig :: TcIdSigInfo -> TcM TcIdSigInst</td>

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488

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<pre style="margin: 0;"> <span id="LC488" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Instantiate a type signature; only used with plan InferGen</span></span>

</pre>

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489

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<pre style="margin: 0;"> <span id="LC489" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstSig</span> <span class="n" style="color: #333;">sig</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CompleteSig</span> <span class="p">{</span> <span class="n" style="color: #333;">sig_bndr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">poly_id</span><span class="p">,</span> <span class="n" style="color: #333;">sig_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">loc</span> <span class="p">})</span></span>

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490

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<pre style="margin: 0;"> <span id="LC490" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setSrcSpan</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">$</span>  <span class="c1" style="color: #998; font-style: italic;">-- Set the binding site of the tyvars</span></span>

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<td class="diff-line-num new_line old" data-linenumber="491" 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="LC491" class="line" lang="haskell">    <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">tv_prs</span><span class="p">,</span> <span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInstTypeBndrs</span> <span class="n" style="color: #333;"><span class="idiff left">newMetaTyVarTyVars</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">poly_id</span></span>

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<pre style="margin: 0;">+<span id="LC491" class="line" lang="haskell">    <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">tv_prs</span><span class="p">,</span> <span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInstTypeBndrs</span> <span class="n" style="color: #333;">poly_id</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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<pre style="margin: 0;"> <span id="LC492" class="line" lang="haskell">              <span class="c1" style="color: #998; font-style: italic;">-- See Note [Pattern bindings and complete signatures]</span></span>

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493

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<pre style="margin: 0;"> <span id="LC493" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC494" 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;">TISI</span> <span class="p">{</span> <span class="n" style="color: #333;">sig_inst_sig</span>   <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sig</span></span>

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<li id="aebe2c3d616f6843166d2657bed048898add6bc9">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/835b5d0ef18db26e93e355e55928059c86f8a688#aebe2c3d616f6843166d2657bed048898add6bc9"><strong>compiler/GHC/Tc/Instance/Class.hs</strong></a>

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

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -16,6 +16,7 @@ import GHC.Prelude</td>

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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Env</span></span>

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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Monad</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.TcType</span></span>

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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Instantiate</span><span class="p">(</span> <span class="n" style="color: #333;">tcInstType</span> <span class="p">)</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Instance.Typeable</span></span>

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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.TcMType</span></span>

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<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types.Evidence</span></span>

</pre>

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<br>

</li>

<li id="07389a8f0516c26409d86f6bb651ed00759b5d4c">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/835b5d0ef18db26e93e355e55928059c86f8a688#07389a8f0516c26409d86f6bb651ed00759b5d4c"><strong>compiler/GHC/Tc/Instance/Family.hs</strong></a>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="21" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="21" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -21,6 +21,7 @@ import GHC.Core.Coercion</td>

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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types.Evidence</span></span>

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<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Iface.Load</span></span>

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<td class="diff-line-num old_line" data-linenumber="23" style="width: 35px; color: rgba(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="LC23" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Monad</span></span>

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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Instantiate</span><span class="p">(</span> <span class="n" style="color: #333;">freshenTyVarBndrs</span><span class="p">,</span> <span class="n" style="color: #333;">freshenCoVarBndrsX</span> <span class="p">)</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.SrcLoc</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">SrcLoc</span></span>

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<pre style="margin: 0;"> <span id="LC26" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCon</span></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="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.TcType</span></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="35" style="width: 35px; color: rgba(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">@@ -35,7 +36,6 @@ import GHC.Data.Maybe</td>

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<pre style="margin: 0;"> <span id="LC36" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCo.Rep</span></span>

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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCo.FVs</span></span>

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<pre style="margin: 0;"> <span id="LC38" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCo.Ppr</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">pprWithExplicitKindsWhen</span> <span class="p">)</span></span>

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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="LC38" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.TcMType</span></span>

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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Name</span></span>

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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Panic</span></span>

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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var.Set</span></span>

</pre>

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</li>

<li id="dd8bbe6a21866e4f574f4796b7ad19de17564072">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/835b5d0ef18db26e93e355e55928059c86f8a688#dd8bbe6a21866e4f574f4796b7ad19de17564072"><strong>compiler/GHC/Tc/TyCl/Class.hs</strong></a>

<hr>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="31" style="width: 35px; color: rgba(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="31" style="width: 35px; color: rgba(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">@@ -31,11 +31,12 @@ where</td>

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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Prelude</span></span>

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<pre style="margin: 0;"> <span id="LC32" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Hs</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC34" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Env</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="35" style="width: 35px; color: rgba(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="LC34" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Gen.Sig</span></span>

</pre>

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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">

36

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<td class="diff-line-num new_line" data-linenumber="35" style="width: 35px; color: rgba(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="LC35" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types.Evidence</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">idHsWrapper</span> <span class="p">)</span></span>

</pre>

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<td class="diff-line-num old_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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<td class="diff-line-num 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">

36

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<pre style="margin: 0;"> <span id="LC36" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Gen.Bind</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="38" style="width: 35px; color: rgba(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="37" style="width: 35px; color: rgba(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="LC37" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Env</span></span>

</pre>

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<td class="diff-line-num old_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">

38

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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="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Unify</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="39" style="width: 35px; color: rgba(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="39" style="width: 35px; color: rgba(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="LC39" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Instantiate</span><span class="p">(</span> <span class="n" style="color: #333;">tcSuperSkolTyVars</span> <span class="p">)</span></span>

</pre>

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39

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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="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Gen.HsType</span></span>

</pre>

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<td class="diff-line-num old_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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<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="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.TcMType</span></span>

</pre>

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<td class="diff-line-num old_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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<td class="diff-line-num new_line" data-linenumber="42" style="width: 35px; color: rgba(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="LC42" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Type</span>     <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">piResultTys</span> <span class="p">)</span></span>

</pre>

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<br>

</li>

<li id="59d42d45d27a766c3ef299d73c226697153b7f6e">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/835b5d0ef18db26e93e355e55928059c86f8a688#59d42d45d27a766c3ef299d73c226697153b7f6e"><strong>compiler/GHC/Tc/Utils/Instantiate.hs</strong></a>

<hr>

<table class="code white" style="font-family: monospace; font-size: 90%;" bgcolor="#fff" width="100%" cellpadding="0" cellspacing="0">

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

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

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -16,6 +16,12 @@ module GHC.Tc.Utils.Instantiate (</td>

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<td class="diff-line-num old_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">

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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">

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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell">       <span class="nf" style="color: #900; font-weight: 600;">instCall</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">instDFunType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">instStupidTheta</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">instTyVarsWith</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num old_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">

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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">

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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell">       <span class="nf" style="color: #900; font-weight: 600;">newWanted</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">newWanteds</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num old_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">

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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">

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

</pre>

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<td class="diff-line-num new old_line" data-linenumber="19" style="width: 35px; color: rgba(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="19" style="width: 35px; color: rgba(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="LC19" class="line" lang="haskell">       <span class="nf" style="color: #900; font-weight: 600;">tcInstType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcInstTypeBndrs</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="19" style="width: 35px; color: rgba(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">

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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell">       <span class="nf" style="color: #900; font-weight: 600;">tcInstSkolTyVars</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcInstSkolTyVarsX</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcInstSkolTyVarsAt</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="19" style="width: 35px; color: rgba(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="21" style="width: 35px; color: rgba(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="LC21" class="line" lang="haskell">       <span class="nf" style="color: #900; font-weight: 600;">tcSkolDFunType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcSuperSkolTyVars</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcInstSuperSkolTyVarsX</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="19" style="width: 35px; color: rgba(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="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">

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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="23" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

23

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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell">       <span class="nf" style="color: #900; font-weight: 600;">freshenTyVarBndrs</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">freshenCoVarBndrsX</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="24" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

24

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

</pre>

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<td class="diff-line-num 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">

19

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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">

25

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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell">       <span class="nf" style="color: #900; font-weight: 600;">tcInstInvisibleTyBindersN</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcInstInvisibleTyBinders</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcInstInvisibleTyBinder</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="20" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

20

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<td class="diff-line-num new_line" data-linenumber="26" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

26

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

</pre>

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<td class="diff-line-num old_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">

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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="haskell">       <span class="nf" style="color: #900; font-weight: 600;">newOverloadedLit</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">mkOverLit</span><span class="p">,</span></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="63" style="width: 35px; color: rgba(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="69" style="width: 35px; color: rgba(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">@@ -63,7 +69,7 @@ import GHC.Types.Id.Make( mkDictFunId )</td>

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<pre style="margin: 0;"> <span id="LC69" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core</span><span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">Expr</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span> <span class="p">)</span>  <span class="c1" style="color: #998; font-style: italic;">-- For the Coercion constructor</span></span>

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<pre style="margin: 0;"> <span id="LC70" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Id</span></span>

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<pre style="margin: 0;"> <span id="LC71" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Name</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC66" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var</span><span class="idiff left"> </span><span class="p"><span class="idiff">(</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">EvVar</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">tyVarName</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">VarBndr</span></span><span class="p"><span class="idiff">(</span></span><span class="o" style="font-weight: 600;"><span class="idiff">..</span></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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<pre style="margin: 0;">+<span id="LC72" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC73" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.DataCon</span></span>

</pre>

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<td class="diff-line-num new_line" data-linenumber="74" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC74" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var.Env</span></span>

</pre>

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<td class="diff-line-num new_line" data-linenumber="75" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC75" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Builtin.Names</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="74" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="diff-line-num unfold js-unfold new_line" data-linenumber="80" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>

<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -74,7 +80,7 @@ import GHC.Utils.Outputable</td>

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<pre style="margin: 0;"> <span id="LC80" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Basic</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">TypeOrKind</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span> <span class="p">)</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC81" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="k" style="font-weight: 600;">qualified</span> <span class="nn" style="color: #555;">GHC.LanguageExtensions</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">LangExt</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC82" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">-<span id="LC77" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.List</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">sortBy</span> <span class="p">)</span></span>

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<pre style="margin: 0;">+<span id="LC83" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.List</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">sortBy</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">mapAccumL</span></span> <span class="p">)</span></span>

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<pre style="margin: 0;"> <span id="LC84" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Monad</span><span class="p">(</span> <span class="n" style="color: #333;">unless</span> <span class="p">)</span></span>

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<pre style="margin: 0;"> <span id="LC85" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Function</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">on</span> <span class="p">)</span></span>

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<pre style="margin: 0;"> <span id="LC86" class="line" lang="haskell"></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="451" style="width: 35px; color: rgba(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="457" style="width: 35px; color: rgba(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">@@ -451,15 +457,192 @@ mkEqBoxTy co ty1 ty2</td>

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<pre style="margin: 0;"> <span id="LC457" class="line" lang="haskell">    <span class="n" style="color: #333;">mkTyConApp</span> <span class="p">(</span><span class="n" style="color: #333;">promoteDataCon</span> <span class="n" style="color: #333;">eqDataCon</span><span class="p">)</span> <span class="p">[</span><span class="n" style="color: #333;">k</span><span class="p">,</span> <span class="n" style="color: #333;">ty1</span><span class="p">,</span> <span class="n" style="color: #333;">ty2</span><span class="p">,</span> <span class="n" style="color: #333;">mkCoercionTy</span> <span class="n" style="color: #333;">co</span><span class="p">]</span></span>

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<pre style="margin: 0;"> <span id="LC458" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcTypeKind</span> <span class="n" style="color: #333;">ty1</span></span>

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<pre style="margin: 0;"> <span id="LC459" class="line" lang="haskell"></span>

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<pre style="margin: 0;">-<span id="LC454" 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="LC455" 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="LC460" 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="LC461" 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="LC457" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        <span class="idiff left right">        Literals</span></span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC462" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        <span class="idiff left right">SkolemTvs (immutable)</span></span></span>

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<pre style="margin: 0;"> <span id="LC463" 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="LC459" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">*********************************************************************<span class="idiff left right">***</span></span></span>

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<pre style="margin: 0;">+<span id="LC464" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">*********************************************************************<span class="idiff left right"> -}</span></span></span>

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<pre style="margin: 0;"> <span id="LC465" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC466" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstType</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">]))</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC467" class="line" lang="haskell">                   <span class="c1" style="color: #998; font-style: italic;">-- ^ How to instantiate the type variables</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC468" class="line" lang="haskell">           <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span>                                           <span class="c1" style="color: #998; font-style: italic;">-- ^ Type to instantiate</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC469" 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;">Name</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">)],</span> <span class="kt" style="color: #458; font-weight: 600;">TcThetaType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Result</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC470" class="line" lang="haskell">                <span class="c1" style="color: #998; font-style: italic;">-- (type vars, preds (incl equalities), rho)</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC471" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstType</span> <span class="n" style="color: #333;">inst_tyvars</span> <span class="n" style="color: #333;">id</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC472" 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;">tyvars</span>   <span class="c1" style="color: #998; font-style: italic;">-- There may be overloading despite no type variables;</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC473" class="line" lang="haskell">                  <span class="c1" style="color: #998; font-style: italic;">--      (?x :: Int) => Int -> Int</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC474" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span> <span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC475" 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="LC476" 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;">subst</span><span class="p">,</span> <span class="n" style="color: #333;">tyvars'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">inst_tyvars</span> <span class="n" style="color: #333;">tyvars</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC477" class="line" lang="haskell">       <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">tv_prs</span>  <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">tyVarName</span> <span class="n" style="color: #333;">tyvars</span> <span class="p">`</span><span class="n" style="color: #333;">zip</span><span class="p">`</span> <span class="n" style="color: #333;">tyvars'</span></span>

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<pre style="margin: 0;">+<span id="LC478" class="line" lang="haskell">             <span class="n" style="color: #333;">subst'</span>  <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendTCvInScopeSet</span> <span class="n" style="color: #333;">subst</span> <span class="p">(</span><span class="n" style="color: #333;">tyCoVarsOfType</span> <span class="n" style="color: #333;">rho</span><span class="p">)</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC479" 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;">tv_prs</span><span class="p">,</span> <span class="n" style="color: #333;">substTheta</span> <span class="n" style="color: #333;">subst'</span> <span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">substTy</span> <span class="n" style="color: #333;">subst'</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span> <span class="p">}</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC480" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC481" class="line" lang="haskell">    <span class="p">(</span><span class="n" style="color: #333;">tyvars</span><span class="p">,</span> <span class="n" style="color: #333;">rho</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcSplitForAllTys</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">id</span><span class="p">)</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC482" class="line" lang="haskell">    <span class="p">(</span><span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span>  <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcSplitPhiTy</span> <span class="n" style="color: #333;">rho</span></span>

</pre>

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483

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<pre style="margin: 0;">+<span id="LC483" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="484" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

484

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<pre style="margin: 0;">+<span id="LC484" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstTypeBndrs</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Id</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;">Name</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">InvisTVBinder</span><span class="p">)],</span> <span class="kt" style="color: #458; font-weight: 600;">TcThetaType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="485" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

485

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<pre style="margin: 0;">+<span id="LC485" class="line" lang="haskell">                     <span class="c1" style="color: #998; font-style: italic;">-- (type vars, preds (incl equalities), rho)</span></span>

</pre>

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486

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<pre style="margin: 0;">+<span id="LC486" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Instantiate the binders of a type signature with TyVarTvs</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="487" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

487

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<pre style="margin: 0;">+<span id="LC487" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstTypeBndrs</span> <span class="n" style="color: #333;">id</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="488" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

488

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<pre style="margin: 0;">+<span id="LC488" 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;">tyvars</span>   <span class="c1" style="color: #998; font-style: italic;">-- There may be overloading despite no type variables;</span></span>

</pre>

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489

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<pre style="margin: 0;">+<span id="LC489" class="line" lang="haskell">                  <span class="c1" style="color: #998; font-style: italic;">--      (?x :: Int) => Int -> Int</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="490" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

490

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<pre style="margin: 0;">+<span id="LC490" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span> <span class="n" style="color: #333;">theta</span><span class="p">,</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 new_line" data-linenumber="491" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

491

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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="n" style="color: #333;">otherwise</span></span>

</pre>

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492

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<pre style="margin: 0;">+<span id="LC492" 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;">subst</span><span class="p">,</span> <span class="n" style="color: #333;">tyvars'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapAccumLM</span> <span class="n" style="color: #333;">inst_invis_bndr</span> <span class="n" style="color: #333;">emptyTCvSubst</span> <span class="n" style="color: #333;">tyvars</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="493" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

493

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<pre style="margin: 0;">+<span id="LC493" class="line" lang="haskell">       <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">tv_prs</span>  <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">tyVarName</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">binderVar</span><span class="p">)</span> <span class="n" style="color: #333;">tyvars</span> <span class="p">`</span><span class="n" style="color: #333;">zip</span><span class="p">`</span> <span class="n" style="color: #333;">tyvars'</span></span>

</pre>

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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">

494

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<pre style="margin: 0;">+<span id="LC494" class="line" lang="haskell">             <span class="n" style="color: #333;">subst'</span>  <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendTCvInScopeSet</span> <span class="n" style="color: #333;">subst</span> <span class="p">(</span><span class="n" style="color: #333;">tyCoVarsOfType</span> <span class="n" style="color: #333;">rho</span><span class="p">)</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">

495

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<pre style="margin: 0;">+<span id="LC495" 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;">tv_prs</span><span class="p">,</span> <span class="n" style="color: #333;">substTheta</span> <span class="n" style="color: #333;">subst'</span> <span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">substTy</span> <span class="n" style="color: #333;">subst'</span> <span class="n" style="color: #333;">tau</span><span class="p">)</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">

496

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<pre style="margin: 0;">+<span id="LC496" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="497" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

497

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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;">tyvars</span><span class="p">,</span> <span class="n" style="color: #333;">rho</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitForAllTysInvis</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">id</span><span class="p">)</span></span>

</pre>

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<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="p">(</span><span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span>  <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcSplitPhiTy</span> <span class="n" style="color: #333;">rho</span></span>

</pre>

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499

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<pre style="margin: 0;">+<span id="LC499" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="500" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

500

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<pre style="margin: 0;">+<span id="LC500" class="line" lang="haskell">    <span class="n" style="color: #333;">inst_invis_bndr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">InvisTVBinder</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="501" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

501

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<pre style="margin: 0;">+<span id="LC501" 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;">TCvSubst</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">InvisTVBinder</span><span class="p">)</span></span>

</pre>

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502

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<pre style="margin: 0;">+<span id="LC502" class="line" lang="haskell">    <span class="n" style="color: #333;">inst_invis_bndr</span> <span class="n" style="color: #333;">subst</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Bndr</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">spec</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="503" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

503

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<pre style="margin: 0;">+<span id="LC503" 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;">subst'</span><span class="p">,</span> <span class="n" style="color: #333;">tv'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newMetaTyVarTyVarX</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tv</span></span>

</pre>

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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="p">(</span><span class="n" style="color: #333;">subst'</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Bndr</span> <span class="n" style="color: #333;">tv'</span> <span class="n" style="color: #333;">spec</span><span class="p">)</span> <span class="p">}</span></span>

</pre>

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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 new new_line" data-linenumber="506" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

506

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<pre style="margin: 0;">+<span id="LC506" class="line" lang="haskell"><span class="n" style="color: #333;">tcSkolDFunType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DFunId</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;">TcTyVar</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">TcThetaType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="507" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

507

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<pre style="margin: 0;">+<span id="LC507" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Instantiate a type signature with skolem constants.</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="508" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

508

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<pre style="margin: 0;">+<span id="LC508" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We could give them fresh names, but no need to do so</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="509" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

509

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<pre style="margin: 0;">+<span id="LC509" class="line" lang="haskell"><span class="n" style="color: #333;">tcSkolDFunType</span> <span class="n" style="color: #333;">dfun</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="510" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

510

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<pre style="margin: 0;">+<span id="LC510" 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;">tv_prs</span><span class="p">,</span> <span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInstType</span> <span class="n" style="color: #333;">tcInstSuperSkolTyVars</span> <span class="n" style="color: #333;">dfun</span></span>

</pre>

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511

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<pre style="margin: 0;">+<span id="LC511" 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;">map</span> <span class="n" style="color: #333;">snd</span> <span class="n" style="color: #333;">tv_prs</span><span class="p">,</span> <span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span> <span class="p">}</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="512" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

512

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<pre style="margin: 0;">+<span id="LC512" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="513" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

513

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<pre style="margin: 0;">+<span id="LC513" class="line" lang="haskell"><span class="n" style="color: #333;">tcSuperSkolTyVars</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">])</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="514" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

514

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<pre style="margin: 0;">+<span id="LC514" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Make skolem constants, but do *not* give them new names, as above</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="515" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

515

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<pre style="margin: 0;">+<span id="LC515" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Moreover, make them "super skolems"; see comments with superSkolemTv</span></span>

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<pre style="margin: 0;">+<span id="LC516" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- see Note [Kind substitution when instantiating]</span></span>

</pre>

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517

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<pre style="margin: 0;">+<span id="LC517" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Precondition: tyvars should be ordered by scoping</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC518" class="line" lang="haskell"><span class="n" style="color: #333;">tcSuperSkolTyVars</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapAccumL</span> <span class="n" style="color: #333;">tcSuperSkolTyVar</span> <span class="n" style="color: #333;">emptyTCvSubst</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC519" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC520" class="line" lang="haskell"><span class="n" style="color: #333;">tcSuperSkolTyVar</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">)</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC521" class="line" lang="haskell"><span class="n" style="color: #333;">tcSuperSkolTyVar</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tv</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC522" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">extendTvSubstWithClone</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">new_tv</span><span class="p">,</span> <span class="n" style="color: #333;">new_tv</span><span class="p">)</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC523" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">where</span></span>

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<pre style="margin: 0;">+<span id="LC524" class="line" lang="haskell">    <span class="n" style="color: #333;">kind</span>   <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substTyUnchecked</span> <span class="n" style="color: #333;">subst</span> <span class="p">(</span><span class="n" style="color: #333;">tyVarKind</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span></span>

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<pre style="margin: 0;">+<span id="LC525" class="line" lang="haskell">    <span class="n" style="color: #333;">new_tv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTcTyVar</span> <span class="p">(</span><span class="n" style="color: #333;">tyVarName</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span> <span class="n" style="color: #333;">kind</span> <span class="n" style="color: #333;">superSkolemTv</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC526" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC527" class="line" lang="haskell"><span class="cd">-- | Given a list of @['TyVar']@, skolemize the type variables,</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC528" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- returning a substitution mapping the original tyvars to the</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC529" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- skolems, and the list of newly bound skolems.</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC530" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstSkolTyVars</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">])</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="531" style="width: 35px; color: rgba(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="LC531" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Skolemising type variables]</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC532" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstSkolTyVars</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcInstSkolTyVarsX</span> <span class="n" style="color: #333;">emptyTCvSubst</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="533" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

533

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<pre style="margin: 0;">+<span id="LC533" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="534" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

534

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<pre style="margin: 0;">+<span id="LC534" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstSkolTyVarsX</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">])</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="535" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

535

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<pre style="margin: 0;">+<span id="LC535" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Skolemising type variables]</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="536" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

536

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<pre style="margin: 0;">+<span id="LC536" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstSkolTyVarsX</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcInstSkolTyVarsPushLevel</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="537" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

537

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<pre style="margin: 0;">+<span id="LC537" class="line" lang="haskell"></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="538" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

538

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<pre style="margin: 0;">+<span id="LC538" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstSuperSkolTyVars</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">])</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="539" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

539

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<pre style="margin: 0;">+<span id="LC539" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Skolemising type variables]</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="540" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

540

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<pre style="margin: 0;">+<span id="LC540" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstSuperSkolTyVars</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcInstSuperSkolTyVarsX</span> <span class="n" style="color: #333;">emptyTCvSubst</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="541" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

541

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<pre style="margin: 0;">+<span id="LC541" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="542" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

542

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<pre style="margin: 0;">+<span id="LC542" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstSuperSkolTyVarsX</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">])</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="543" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

543

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<pre style="margin: 0;">+<span id="LC543" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Skolemising type variables]</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="544" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

544

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<pre style="margin: 0;">+<span id="LC544" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstSuperSkolTyVarsX</span> <span class="n" style="color: #333;">subst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcInstSkolTyVarsPushLevel</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="n" style="color: #333;">subst</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="545" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

545

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<pre style="margin: 0;">+<span id="LC545" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="546" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

546

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<pre style="margin: 0;">+<span id="LC546" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstSkolTyVarsPushLevel</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="547" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

547

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<pre style="margin: 0;">+<span id="LC547" 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;">TCvSubst</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">])</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="548" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

548

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<pre style="margin: 0;">+<span id="LC548" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Skolemise one level deeper, hence pushTcLevel</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="549" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

549

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<pre style="margin: 0;">+<span id="LC549" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Skolemising type variables]</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="550" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

550

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<pre style="margin: 0;">+<span id="LC550" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstSkolTyVarsPushLevel</span> <span class="n" style="color: #333;">overlappable</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tvs</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="551" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

551

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<pre style="margin: 0;">+<span id="LC551" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">tc_lvl</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getTcLevel</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="552" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

552

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<pre style="margin: 0;">+<span id="LC552" class="line" lang="haskell">       <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">pushed_lvl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pushTcLevel</span> <span class="n" style="color: #333;">tc_lvl</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="553" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

553

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<pre style="margin: 0;">+<span id="LC553" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">tcInstSkolTyVarsAt</span> <span class="n" style="color: #333;">pushed_lvl</span> <span class="n" style="color: #333;">overlappable</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tvs</span> <span class="p">}</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="554" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

554

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<pre style="margin: 0;">+<span id="LC554" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="555" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

555

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<pre style="margin: 0;">+<span id="LC555" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstSkolTyVarsAt</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;">Bool</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="556" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

556

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<pre style="margin: 0;">+<span id="LC556" class="line" lang="haskell">                   <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="557" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

557

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<pre style="margin: 0;">+<span id="LC557" 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;">TCvSubst</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">])</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="558" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

558

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<pre style="margin: 0;">+<span id="LC558" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstSkolTyVarsAt</span> <span class="n" style="color: #333;">lvl</span> <span class="n" style="color: #333;">overlappable</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tvs</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="559" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

559

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<pre style="margin: 0;">+<span id="LC559" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">freshenTyCoVarsX</span> <span class="n" style="color: #333;">new_skol_tv</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tvs</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="560" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

560

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<pre style="margin: 0;">+<span id="LC560" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="561" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

561

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<pre style="margin: 0;">+<span id="LC561" class="line" lang="haskell">    <span class="n" style="color: #333;">details</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SkolemTv</span> <span class="n" style="color: #333;">lvl</span> <span class="n" style="color: #333;">overlappable</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="562" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

562

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<pre style="margin: 0;">+<span id="LC562" class="line" lang="haskell">    <span class="n" style="color: #333;">new_skol_tv</span> <span class="n" style="color: #333;">name</span> <span class="n" style="color: #333;">kind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTcTyVar</span> <span class="n" style="color: #333;">name</span> <span class="n" style="color: #333;">kind</span> <span class="n" style="color: #333;">details</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="563" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

563

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<pre style="margin: 0;">+<span id="LC563" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="564" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

564

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<pre style="margin: 0;">+<span id="LC564" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">------------------</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="565" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

565

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<pre style="margin: 0;">+<span id="LC565" class="line" lang="haskell"><span class="n" style="color: #333;">freshenTyVarBndrs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">])</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="566" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

566

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<pre style="margin: 0;">+<span id="LC566" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ^ Give fresh uniques to a bunch of TyVars, but they stay</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="567" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

567

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<pre style="margin: 0;">+<span id="LC567" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--   as TyVars, rather than becoming TcTyVars</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="568" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

568

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<pre style="margin: 0;">+<span id="LC568" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Used in 'GHC.Tc.Instance.Family.newFamInst', and 'GHC.Tc.Utils.Instantiate.newClsInst'</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="569" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

569

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<pre style="margin: 0;">+<span id="LC569" class="line" lang="haskell"><span class="n" style="color: #333;">freshenTyVarBndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">freshenTyCoVars</span> <span class="n" style="color: #333;">mkTyVar</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="570" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

570

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<pre style="margin: 0;">+<span id="LC570" class="line" lang="haskell"></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="571" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

571

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<pre style="margin: 0;">+<span id="LC571" class="line" lang="haskell"><span class="n" style="color: #333;">freshenCoVarBndrsX</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoVar</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;">TCvSubst</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoVar</span><span class="p">])</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="572" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

572

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<pre style="margin: 0;">+<span id="LC572" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ^ Give fresh uniques to a bunch of CoVars</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="573" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

573

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<pre style="margin: 0;">+<span id="LC573" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Used in "GHC.Tc.Instance.Family.newFamInst"</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="574" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

574

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<pre style="margin: 0;">+<span id="LC574" class="line" lang="haskell"><span class="n" style="color: #333;">freshenCoVarBndrsX</span> <span class="n" style="color: #333;">subst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">freshenTyCoVarsX</span> <span class="n" style="color: #333;">mkCoVar</span> <span class="n" style="color: #333;">subst</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="575" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

575

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<pre style="margin: 0;">+<span id="LC575" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="576" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

576

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<pre style="margin: 0;">+<span id="LC576" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">------------------</span></span>

</pre>

</td>

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<td class="diff-line-num new new_line" data-linenumber="577" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

577

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<pre style="margin: 0;">+<span id="LC577" class="line" lang="haskell"><span class="n" style="color: #333;">freshenTyCoVars</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Kind</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCoVar</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="461" style="width: 35px; color: rgba(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="578" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

578

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<pre style="margin: 0;">+<span id="LC578" 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;">TyVar</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;">TCvSubst</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyCoVar</span><span class="p">])</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="579" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

579

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<pre style="margin: 0;">+<span id="LC579" class="line" lang="haskell"><span class="n" style="color: #333;">freshenTyCoVars</span> <span class="n" style="color: #333;">mk_tcv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">freshenTyCoVarsX</span> <span class="n" style="color: #333;">mk_tcv</span> <span class="n" style="color: #333;">emptyTCvSubst</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="580" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

580

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<pre style="margin: 0;">+<span id="LC580" class="line" lang="haskell"></span>

</pre>

</td>

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<td class="diff-line-num new new_line" data-linenumber="581" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

581

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<pre style="margin: 0;">+<span id="LC581" class="line" lang="haskell"><span class="n" style="color: #333;">freshenTyCoVarsX</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Kind</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCoVar</span><span class="p">)</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="582" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

582

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<pre style="margin: 0;">+<span id="LC582" class="line" lang="haskell">                 <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyCoVar</span><span class="p">]</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="583" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

583

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<pre style="margin: 0;">+<span id="LC583" class="line" lang="haskell">                 <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyCoVar</span><span class="p">])</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="584" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

584

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<pre style="margin: 0;">+<span id="LC584" class="line" lang="haskell"><span class="n" style="color: #333;">freshenTyCoVarsX</span> <span class="n" style="color: #333;">mk_tcv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapAccumLM</span> <span class="p">(</span><span class="n" style="color: #333;">freshenTyCoVarX</span> <span class="n" style="color: #333;">mk_tcv</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="585" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

585

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<pre style="margin: 0;">+<span id="LC585" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="586" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

586

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<pre style="margin: 0;">+<span id="LC586" class="line" lang="haskell"><span class="n" style="color: #333;">freshenTyCoVarX</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Kind</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCoVar</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="587" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

587

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<pre style="margin: 0;">+<span id="LC587" class="line" lang="haskell">                <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCoVar</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;">TCvSubst</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TyCoVar</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="588" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

588

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<pre style="margin: 0;">+<span id="LC588" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This a complete freshening operation:</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="589" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

589

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<pre style="margin: 0;">+<span id="LC589" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the skolems have a fresh unique, and a location from the monad</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="590" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

590

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<pre style="margin: 0;">+<span id="LC590" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Skolemising type variables]</span></span>

</pre>

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591

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<pre style="margin: 0;">+<span id="LC591" class="line" lang="haskell"><span class="n" style="color: #333;">freshenTyCoVarX</span> <span class="n" style="color: #333;">mk_tcv</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tycovar</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="592" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

592

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<pre style="margin: 0;">+<span id="LC592" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">loc</span>  <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getSrcSpanM</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="593" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

593

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<pre style="margin: 0;">+<span id="LC593" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">uniq</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newUnique</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="594" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

594

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<pre style="margin: 0;">+<span id="LC594" class="line" lang="haskell">       <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">old_name</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyVarName</span> <span class="n" style="color: #333;">tycovar</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="595" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

595

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<pre style="margin: 0;">+<span id="LC595" class="line" lang="haskell">             <span class="n" style="color: #333;">new_name</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkInternalName</span> <span class="n" style="color: #333;">uniq</span> <span class="p">(</span><span class="n" style="color: #333;">getOccName</span> <span class="n" style="color: #333;">old_name</span><span class="p">)</span> <span class="n" style="color: #333;">loc</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="596" style="width: 35px; color: rgba(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="LC596" class="line" lang="haskell">             <span class="n" style="color: #333;">new_kind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substTyUnchecked</span> <span class="n" style="color: #333;">subst</span> <span class="p">(</span><span class="n" style="color: #333;">tyVarKind</span> <span class="n" style="color: #333;">tycovar</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="597" style="width: 35px; color: rgba(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="LC597" class="line" lang="haskell">             <span class="n" style="color: #333;">new_tcv</span>  <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mk_tcv</span> <span class="n" style="color: #333;">new_name</span> <span class="n" style="color: #333;">new_kind</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="598" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

598

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<pre style="margin: 0;">+<span id="LC598" class="line" lang="haskell">             <span class="n" style="color: #333;">subst1</span>   <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendTCvSubstWithClone</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tycovar</span> <span class="n" style="color: #333;">new_tcv</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="599" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

599

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<pre style="margin: 0;">+<span id="LC599" 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;">subst1</span><span class="p">,</span> <span class="n" style="color: #333;">new_tcv</span><span class="p">)</span> <span class="p">}</span></span>

</pre>

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600

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<pre style="margin: 0;">+<span id="LC600" class="line" lang="haskell"></span>

</pre>

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601

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<pre style="margin: 0;">+<span id="LC601" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Skolemising type variables]</span></span>

</pre>

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602

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<pre style="margin: 0;">+<span id="LC602" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>

</pre>

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603

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<pre style="margin: 0;">+<span id="LC603" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The tcInstSkolTyVars family of functions instantiate a list of TyVars</span></span>

</pre>

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604

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<pre style="margin: 0;">+<span id="LC604" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to fresh skolem TcTyVars. Important notes:</span></span>

</pre>

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605

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<pre style="margin: 0;">+<span id="LC605" class="line" lang="haskell"></span>

</pre>

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606

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<pre style="margin: 0;">+<span id="LC606" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">a) Level allocation. We generally skolemise /before/ calling</span></span>

</pre>

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607

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<pre style="margin: 0;">+<span id="LC607" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   pushLevelAndCaptureConstraints.  So we want their level to the level</span></span>

</pre>

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608

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<pre style="margin: 0;">+<span id="LC608" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   of the soon-to-be-created implication, which has a level ONE HIGHER</span></span>

</pre>

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609

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<pre style="margin: 0;">+<span id="LC609" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   than the current level.  Hence the pushTcLevel.  It feels like a</span></span>

</pre>

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610

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<pre style="margin: 0;">+<span id="LC610" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   slight hack.</span></span>

</pre>

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611

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<pre style="margin: 0;">+<span id="LC611" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC612" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">b) The [TyVar] should be ordered (kind vars first)</span></span>

</pre>

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613

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<pre style="margin: 0;">+<span id="LC613" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   See Note [Kind substitution when instantiating]</span></span>

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<td class="diff-line-num new new_line" data-linenumber="614" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

614

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<pre style="margin: 0;">+<span id="LC614" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="615" style="width: 35px; color: rgba(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="LC615" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">c) It's a complete freshening operation: the skolems have a fresh</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC616" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   unique, and a location from the monad</span></span>

</pre>

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617

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<pre style="margin: 0;">+<span id="LC617" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="618" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

618

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<pre style="margin: 0;">+<span id="LC618" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">d) The resulting skolems are</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="619" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

619

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<pre style="margin: 0;">+<span id="LC619" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        non-overlappable for tcInstSkolTyVars,</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="620" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

620

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<pre style="margin: 0;">+<span id="LC620" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   but overlappable for tcInstSuperSkolTyVars</span></span>

</pre>

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621

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<pre style="margin: 0;">+<span id="LC621" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   See GHC.Tc.Deriv.Infer Note [Overlap and deriving] for an example</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="622" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

622

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<pre style="margin: 0;">+<span id="LC622" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   of where this matters.</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="623" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

623

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<pre style="margin: 0;">+<span id="LC623" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="624" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

624

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<pre style="margin: 0;">+<span id="LC624" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Kind substitution when instantiating]</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="625" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

625

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<pre style="margin: 0;">+<span id="LC625" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="626" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

626

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<pre style="margin: 0;">+<span id="LC626" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">When we instantiate a bunch of kind and type variables, first we</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="627" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

627

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<pre style="margin: 0;">+<span id="LC627" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">expect them to be topologically sorted.</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="628" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

628

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<pre style="margin: 0;">+<span id="LC628" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Then we have to instantiate the kind variables, build a substitution</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="629" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

629

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<pre style="margin: 0;">+<span id="LC629" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">from old variables to the new variables, then instantiate the type</span></span>

</pre>

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630

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<pre style="margin: 0;">+<span id="LC630" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">variables substituting the original kind.</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="631" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

631

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

</pre>

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632

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<pre style="margin: 0;">+<span id="LC632" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Exemple: If we want to instantiate</span></span>

</pre>

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633

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<pre style="margin: 0;">+<span id="LC633" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  [(k1 :: *), (k2 :: *), (a :: k1 -> k2), (b :: k1)]</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="634" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

634

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<pre style="margin: 0;">+<span id="LC634" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we want</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="635" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

635

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<pre style="margin: 0;">+<span id="LC635" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  [(?k1 :: *), (?k2 :: *), (?a :: ?k1 -> ?k2), (?b :: ?k1)]</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="636" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

636

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<pre style="margin: 0;">+<span id="LC636" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">instead of the bogus</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="637" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

637

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<pre style="margin: 0;">+<span id="LC637" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  [(?k1 :: *), (?k2 :: *), (?a :: k1 -> k2), (?b :: k1)]</span></span>

</pre>

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461

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638

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<pre style="margin: 0;"> <span id="LC638" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>

</pre>

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462

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<td class="diff-line-num new_line" data-linenumber="639" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

639

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<pre style="margin: 0;"> <span id="LC639" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="640" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

640

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<pre style="margin: 0;">+<span id="LC640" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *********************************************************************</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="641" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

641

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<pre style="margin: 0;">+<span id="LC641" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">*                                                                      *</span></span>

</pre>

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642

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<pre style="margin: 0;">+<span id="LC642" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">                Literals</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="463" style="width: 35px; color: rgba(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="643" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

643

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<pre style="margin: 0;">+<span id="LC643" 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="463" style="width: 35px; color: rgba(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="644" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

644

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<pre style="margin: 0;">+<span id="LC644" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">********************************************************************* -}</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="645" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

645

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<pre style="margin: 0;">+<span id="LC645" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="463" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

463

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<td class="diff-line-num new_line" data-linenumber="646" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

646

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<pre style="margin: 0;"> <span id="LC646" 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="464" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

464

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<td class="diff-line-num new_line" data-linenumber="647" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

647

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<pre style="margin: 0;"> <span id="LC647" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In newOverloadedLit we convert directly to an Int or Integer if we</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="465" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

465

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<td class="diff-line-num new_line" data-linenumber="648" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

648

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<pre style="margin: 0;"> <span id="LC648" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">know that's what we want.  This may save some time, by not</span></span>

</pre>

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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="657" style="width: 35px; color: rgba(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 +657,6 @@ newOverloadedLit :: HsOverLit GhcRn</td>

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474

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657

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<pre style="margin: 0;"> <span id="LC657" class="line" lang="haskell"><span class="n" style="color: #333;">newOverloadedLit</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="475" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

475

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<td class="diff-line-num new_line" data-linenumber="658" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

658

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<pre style="margin: 0;"> <span id="LC658" 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>

</pre>

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<td class="diff-line-num old_line" data-linenumber="476" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

476

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<td class="diff-line-num new_line" data-linenumber="659" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

659

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<pre style="margin: 0;"> <span id="LC659" 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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477

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<td class="diff-line-num new_line old" data-linenumber="660" 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="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>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="478" 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">

478

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<td class="diff-line-num new_line old" data-linenumber="660" 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="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">

479

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<td class="diff-line-num new_line" data-linenumber="660" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

660

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<pre style="margin: 0;"> <span id="LC660" 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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480

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<td class="diff-line-num new_line" data-linenumber="661" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

661

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<pre style="margin: 0;"> <span id="LC661" 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">

481

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<td class="diff-line-num new_line" data-linenumber="662" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

662

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<pre style="margin: 0;"> <span id="LC662" class="line" lang="haskell">       <span 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/835b5d0ef18db26e93e355e55928059c86f8a688#94c96afe1bb3b771ffbcfeeca34ce43ebbe76ccb"><strong>compiler/GHC/Tc/Utils/TcMType.hs</strong></a>

<hr>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="31" style="width: 35px; color: rgba(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="31" style="width: 35px; color: rgba(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">@@ -31,15 +31,6 @@ module GHC.Tc.Utils.TcMType (</td>

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<td class="diff-line-num old_line" data-linenumber="31" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

31

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31

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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell">  <span class="nf" style="color: #900; font-weight: 600;">newTauTvDetailsAtLevel</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">newMetaDetails</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">newMetaTyVarName</span><span class="p">,</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC32" class="line" lang="haskell">  <span class="nf" style="color: #900; font-weight: 600;">isFilledMetaTyVar_maybe</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isFilledMetaTyVar</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isUnfilledMetaTyVar</span><span class="p">,</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">-<span id="LC34" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">--------------------------------</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC35" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- Expected types</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="36" 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="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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<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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<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>

</pre>

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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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<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>

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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="LC42" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC34" 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="LC35" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- Creating new evidence variables</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC36" class="line" lang="haskell">  <span class="nf" style="color: #900; font-weight: 600;">newEvVar</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">newEvVars</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">newDict</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="58" style="width: 35px; color: rgba(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="49" style="width: 35px; color: rgba(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">@@ -58,14 +49,18 @@ module GHC.Tc.Utils.TcMType (</td>

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<pre style="margin: 0;"> <span id="LC49" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">--------------------------------</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- Instantiation</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell">  <span class="nf" style="color: #900; font-weight: 600;">newMetaTyVars</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">newMetaTyVarX</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">newMetaTyVarsX</span><span class="p">,</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC61" class="line" lang="haskell">  <span class="nf" style="color: #900; font-weight: 600;">newMetaTyVarTyVar<span class="idiff left">s</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">newMetaTyVarTyVar</span>X</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="52" style="width: 35px; color: rgba(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="LC52" class="line" lang="haskell">  <span class="nf" style="color: #900; font-weight: 600;">newMetaTyVarTyVarX</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="62" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

62

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<td class="diff-line-num new_line" data-linenumber="53" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC53" class="line" lang="haskell">  <span class="nf" style="color: #900; font-weight: 600;">newTyVarTyVar</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">cloneTyVarTyVar</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="63" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

63

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<td class="diff-line-num new_line" data-linenumber="54" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

54

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<pre style="margin: 0;"> <span id="LC54" class="line" lang="haskell">  <span class="nf" style="color: #900; font-weight: 600;">newPatSigTyVar</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">newSkolemTyVar</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">newWildCardX</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="64" 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">

64

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

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<pre style="margin: 0;">-<span id="LC64" class="line" lang="haskell">  <span class="nf" style="color: #900; font-weight: 600;">tcInstType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcInstTypeBndrs</span><span class="p">,</span></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="65" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

65

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

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<pre style="margin: 0;">-<span id="LC65" class="line" lang="haskell">  <span class="nf" style="color: #900; font-weight: 600;">tcInstSkolTyVars</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcInstSkolTyVarsX</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcInstSkolTyVarsAt</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="66" 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">

66

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

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<pre style="margin: 0;">-<span id="LC66" class="line" lang="haskell">  <span class="nf" style="color: #900; font-weight: 600;">tcSkolDFunType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcSuperSkolTyVars</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcInstSuperSkolTyVarsX</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="67" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

67

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<td class="diff-line-num new_line" data-linenumber="55" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

55

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

<pre style="margin: 0;"> <span id="LC55" class="line" lang="haskell"></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="68" 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="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="line_content old" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#fbe9eb">

<pre style="margin: 0;">-<span id="LC68" class="line" lang="haskell">  <span class="nf" style="color: #900; font-weight: 600;">freshenTyVarBndrs</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">freshenCoVarBndrsX</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="69" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="56" style="width: 35px; color: rgba(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="LC56" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">--------------------------------</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="69" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="57" style="width: 35px; color: rgba(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="LC57" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- Expected types</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="69" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="58" style="width: 35px; color: rgba(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="LC58" 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 old_line" data-linenumber="69" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="59" style="width: 35px; color: rgba(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="LC59" class="line" lang="haskell">  <span class="nf" style="color: #900; font-weight: 600;">mkCheckExpType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">newInferExpType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcInfer</span><span class="p">,</span></span>

</pre>

</td>

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

<td class="diff-line-num new old_line" data-linenumber="69" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="60" style="width: 35px; color: rgba(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="LC60" 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>

</td>

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

<td class="diff-line-num new old_line" data-linenumber="69" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_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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<pre style="margin: 0;">+<span id="LC61" 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>

</td>

</tr>

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

<td class="diff-line-num new old_line" data-linenumber="69" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="62" style="width: 35px; color: rgba(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="LC62" 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>

</td>

</tr>

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

<td class="diff-line-num new old_line" data-linenumber="69" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="63" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC63" class="line" lang="haskell">  <span class="nf" style="color: #900; font-weight: 600;">inferResultToType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">fillInferResult</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">promoteTcType</span><span class="p">,</span></span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="69" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

69

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

64

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

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

</pre>

</td>

</tr>

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

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

70

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<td class="diff-line-num new_line" data-linenumber="65" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

65

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<pre style="margin: 0;"> <span id="LC65" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">--------------------------------</span></span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="71" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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

66

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<pre style="margin: 0;"> <span id="LC66" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- Zonking and tidying</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="99" style="width: 35px; color: rgba(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="94" style="width: 35px; color: rgba(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">@@ -99,6 +94,8 @@ module GHC.Tc.Utils.TcMType (</td>

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<td class="diff-line-num old_line" data-linenumber="99" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

99

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<td class="diff-line-num new_line" data-linenumber="94" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

94

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<pre style="margin: 0;"> <span id="LC94" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- friends:</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="100" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

100

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<td class="diff-line-num new_line" data-linenumber="95" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

95

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<pre style="margin: 0;"> <span id="LC95" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Prelude</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="101" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

101

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<td class="diff-line-num new_line" data-linenumber="96" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

96

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<pre style="margin: 0;"> <span id="LC96" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="102" style="width: 35px; color: rgba(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="97" style="width: 35px; color: rgba(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="LC97" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">{-#</span> <span class="nn" style="color: #555;">SOURCE</span> <span class="o" style="font-weight: 600;">#-</span><span class="p">}</span>   <span class="kt" style="color: #458; font-weight: 600;">GHC</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Tc</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Utils</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Unify</span><span class="p">(</span> <span class="n" style="color: #333;">unifyType</span><span class="p">,</span> <span class="n" style="color: #333;">unifyKind</span> <span class="p">)</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="102" style="width: 35px; color: rgba(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="98" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

98

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<pre style="margin: 0;">+<span id="LC98" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="102" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

102

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<td class="diff-line-num new_line" data-linenumber="99" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

99

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<pre style="margin: 0;"> <span id="LC99" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCo.Rep</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="103" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

103

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<td class="diff-line-num new_line" data-linenumber="100" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

100

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<pre style="margin: 0;"> <span id="LC100" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCo.Ppr</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="104" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

104

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<td class="diff-line-num new_line" data-linenumber="101" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

101

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<pre style="margin: 0;"> <span id="LC101" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.TcType</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="133" style="width: 35px; color: rgba(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="130" style="width: 35px; color: rgba(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">@@ -133,7 +130,6 @@ import GHC.Types.Basic ( TypeOrKind(..) )</td>

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<td class="diff-line-num old_line" data-linenumber="133" style="width: 35px; color: rgba(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="130" style="width: 35px; color: rgba(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="LC130" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="134" style="width: 35px; color: rgba(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="131" style="width: 35px; color: rgba(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="LC131" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Monad</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="135" style="width: 35px; color: rgba(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="132" style="width: 35px; color: rgba(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="LC132" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Data.Maybe</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="136" 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="133" 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="LC136" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.List</span>        <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">mapAccumL</span> <span class="p">)</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="137" style="width: 35px; color: rgba(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="LC133" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Arrow</span>    <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">second</span> <span class="p">)</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="138" style="width: 35px; color: rgba(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="134" style="width: 35px; color: rgba(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="LC134" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="k" style="font-weight: 600;">qualified</span> <span class="nn" style="color: #555;">Data.Semigroup</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">Semi</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="139" style="width: 35px; color: rgba(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="135" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

135

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<pre style="margin: 0;"> <span id="LC135" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="387" style="width: 35px; color: rgba(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="383" style="width: 35px; color: rgba(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">@@ -387,16 +383,14 @@ checkCoercionHole cv co</td>

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<td class="diff-line-num old_line" data-linenumber="387" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

387

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<td class="diff-line-num new_line" data-linenumber="383" style="width: 35px; color: rgba(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="LC383" class="line" lang="haskell">             <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="388" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

388

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<td class="diff-line-num new_line" data-linenumber="384" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

384

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<pre style="margin: 0;"> <span id="LC384" class="line" lang="haskell">             <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="389" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

389

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<td class="diff-line-num new_line" data-linenumber="385" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

385

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<pre style="margin: 0;"> <span id="LC385" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="390" 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">

390

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<td class="diff-line-num new_line old" data-linenumber="386" 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="LC390" 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="391" 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">

391

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<td class="diff-line-num new_line old" data-linenumber="386" 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="LC391" 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="392" style="width: 35px; color: rgba(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="386" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

386

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<pre style="margin: 0;">+<span id="LC386" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- **********************************************************************</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="392" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

392

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<td class="diff-line-num new_line" data-linenumber="387" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

387

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<pre style="margin: 0;"> <span id="LC387" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">*</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="393" 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">

393

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<td class="diff-line-num new_line old" data-linenumber="388" 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="LC393" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">    <span class="idiff left right">Expected type</span>s</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="394" style="width: 35px; color: rgba(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="388" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

388

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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="LC388" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">    <span class="idiff left right">                  ExpType function</span>s</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="394" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

394

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<td class="diff-line-num new_line" data-linenumber="389" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

389

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<pre style="margin: 0;"> <span id="LC389" 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="395" 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">

395

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<td class="diff-line-num new_line old" data-linenumber="390" 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="LC395" 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="396" 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">

396

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<td class="diff-line-num new_line old" data-linenumber="390" 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="LC396" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="397" 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">

397

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<td class="diff-line-num new_line old" data-linenumber="390" 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="LC397" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [ExpType]</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="398" 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">

398

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<td class="diff-line-num new_line old" data-linenumber="390" 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="LC398" 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="399" style="width: 35px; color: rgba(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="390" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

390

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<pre style="margin: 0;">+<span id="LC390" 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="399" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

399

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<td class="diff-line-num new_line" data-linenumber="391" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

391

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

<pre style="margin: 0;"> <span id="LC391" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="400" style="width: 35px; color: rgba(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="392" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

392

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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="LC392" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [ExpType]</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="400" style="width: 35px; color: rgba(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="393" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

393

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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="LC393" 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="400" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

400

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<td class="diff-line-num new_line" data-linenumber="394" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

394

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<pre style="margin: 0;"> <span id="LC394" 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>

</pre>

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<td class="diff-line-num old_line" data-linenumber="401" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

401

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<td class="diff-line-num new_line" data-linenumber="395" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

395

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<pre style="margin: 0;"> <span id="LC395" 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>

</pre>

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<td class="diff-line-num old_line" data-linenumber="402" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

402

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<td class="diff-line-num new_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">

396

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<pre style="margin: 0;"> <span id="LC396" 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>

</pre>

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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="420" style="width: 35px; color: rgba(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">@@ -426,14 +420,12 @@ Consider</td>

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420

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<pre style="margin: 0;"> <span id="LC420" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC421" 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>

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<pre style="margin: 0;"> <span id="LC422" 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>

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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="LC423" 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;">fill the ExpType with a tau-tv at the low TcLevel, hopefully to</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;">be worked out later by some means. This is triggered in</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;">test gadt/gadt-escape1.</span></span>

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<pre style="margin: 0;">+<span id="LC424" 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 fill</span></span>

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<pre style="margin: 0;">+<span id="LC425" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the ExpType with a tau-tv at the low TcLevel, hopefully to be worked</span></span>

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<pre style="margin: 0;">+<span id="LC426" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">out later by some means -- see fillInferResult, and Note [fillInferResult]</span></span>

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<pre style="margin: 0;"> <span id="LC427" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC428" 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="LC429" 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="LC430" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC431" 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 +445,12 @@ readExpType_maybe :: ExpType -> TcM (Maybe TcType)</td>

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<pre style="margin: 0;"> <span id="LC445" 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="LC446" 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="LC447" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC448" 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="LC449" 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="LC450" 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="LC451" 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="LC452" 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="LC453" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC454" 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="LC455" 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="LC456" 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 +470,10 @@ checkingExpType :: String -> ExpType -> TcType</td>

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<pre style="margin: 0;"> <span id="LC470" 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="LC471" 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="LC472" 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="LC473" 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="LC474" 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="LC475" 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="LC476" 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="LC477" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC478" 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="LC479" 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>

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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">@@ -488,209 +484,283 @@ expTypeToType (Infer inf_res) = inferResultToType inf_res</td>

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<pre style="margin: 0;"> <span id="LC484" 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="LC485" 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="LC486" 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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<pre style="margin: 0;">-<span id="LC492" 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>

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<pre style="margin: 0;">-<span id="LC493" 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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<pre style="margin: 0;">-<span id="LC494" 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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<pre style="margin: 0;">+<span id="LC487" 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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<pre style="margin: 0;">+<span id="LC488" 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="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>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="489" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

489

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<pre style="margin: 0;">+<span id="LC489" 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="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">ensureMonoType</span> <span class="n" style="color: #333;">ty</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC490" class="line" lang="haskell">                            <span class="c1" style="color: #998; font-style: italic;">-- See Note [inferResultToType]</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC491" class="line" lang="haskell">                          <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">ty</span> <span class="p">}</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC492" class="line" lang="haskell">            <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span 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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<pre style="margin: 0;">+<span id="LC493" 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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<pre style="margin: 0;">+<span id="LC494" 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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<pre style="margin: 0;">+<span id="LC495" 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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496

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<pre style="margin: 0;">+<span id="LC496" 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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495

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<td class="diff-line-num new_line" data-linenumber="497" style="width: 35px; color: rgba(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="LC497" 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 new_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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<pre style="margin: 0;"> <span id="LC498" 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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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;">return</span> <span class="n" style="color: #333;">tau</span> <span class="p">}</span></span>

</pre>

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500

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<pre style="margin: 0;"> <span id="LC500" class="line" lang="haskell"></span>

</pre>

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501

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<pre style="margin: 0;">+<span id="LC501" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [inferResultToType]</span></span>

</pre>

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502

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<pre style="margin: 0;">+<span id="LC502" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>

</pre>

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503

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<pre style="margin: 0;">+<span id="LC503" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">expTypeToType and inferResultType convert an InferResult to a monotype.</span></span>

</pre>

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504

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<pre style="margin: 0;">+<span id="LC504" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">It must be a monotype because if the InferResult isn't already filled in,</span></span>

</pre>

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505

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<pre style="margin: 0;">+<span id="LC505" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we fill it in with a unification variable (hence monotype).  So to preserve</span></span>

</pre>

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506

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<pre style="margin: 0;">+<span id="LC506" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">order-independence we check for mono-type-ness even if it *is* filled in</span></span>

</pre>

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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;">already.</span></span>

</pre>

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508

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<pre style="margin: 0;">+<span id="LC508" class="line" lang="haskell"></span>

</pre>

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509

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<pre style="margin: 0;">+<span id="LC509" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See also Note [TcLevel of ExpType] above, and</span></span>

</pre>

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510

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<pre style="margin: 0;">+<span id="LC510" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [fillInferResult].</span></span>

</pre>

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511

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<pre style="margin: 0;">+<span id="LC511" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>

</pre>

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512

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<pre style="margin: 0;">+<span id="LC512" class="line" lang="haskell"></span>

</pre>

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513

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<pre style="margin: 0;">+<span id="LC513" class="line" lang="haskell"><span class="cd">-- | Infer a type using a fresh ExpType</span></span>

</pre>

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514

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<pre style="margin: 0;">+<span id="LC514" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See also Note [ExpType] in "GHC.Tc.Utils.TcMType"</span></span>

</pre>

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515

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<pre style="margin: 0;">+<span id="LC515" class="line" lang="haskell"><span class="n" style="color: #333;">tcInfer</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="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="n" style="color: #333;">a</span><span class="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="n" style="color: #333;">a</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span><span class="p">)</span></span>

</pre>

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516

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<pre style="margin: 0;">+<span id="LC516" class="line" lang="haskell"><span class="n" style="color: #333;">tcInfer</span> <span class="n" style="color: #333;">tc_check</span></span>

</pre>

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517

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<pre style="margin: 0;">+<span id="LC517" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="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;">newInferExpType</span></span>

</pre>

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518

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<pre style="margin: 0;">+<span id="LC518" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tc_check</span> <span class="n" style="color: #333;">res_ty</span></span>

</pre>

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519

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<pre style="margin: 0;">+<span id="LC519" 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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520

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<pre style="margin: 0;">+<span id="LC520" 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;">result</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span> <span class="p">}</span></span>

</pre>

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521

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<pre style="margin: 0;">+<span id="LC521" class="line" lang="haskell"></span>

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522

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<pre style="margin: 0;">+<span id="LC522" 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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523

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<pre style="margin: 0;">+<span id="LC523" 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="524" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

524

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<pre style="margin: 0;">+<span id="LC524" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--    => co :: t1 ~ t2</span></span>

</pre>

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525

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<pre style="margin: 0;">+<span id="LC525" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [fillInferResult]</span></span>

</pre>

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526

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<pre style="margin: 0;">+<span id="LC526" 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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527

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<pre style="margin: 0;">+<span id="LC527" class="line" lang="haskell">                               <span class="p">,</span> <span class="n" style="color: #333;">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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528

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<pre style="margin: 0;">+<span id="LC528" 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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529

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<pre style="margin: 0;">+<span id="LC529" 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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530

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<pre style="margin: 0;">+<span id="LC530" 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="531" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

531

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<pre style="margin: 0;">+<span id="LC531" 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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532

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<pre style="margin: 0;">+<span id="LC532" 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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533

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<pre style="margin: 0;">+<span id="LC533" class="line" lang="haskell">                     <span class="p">;</span> <span class="n" style="color: #333;">cur_lvl</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getTcLevel</span></span>

</pre>

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534

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<pre style="margin: 0;">+<span id="LC534" class="line" lang="haskell">                     <span class="p">;</span> <span class="n" style="color: #333;">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;">res_lvl</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>

</pre>

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535

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<pre style="margin: 0;">+<span id="LC535" class="line" lang="haskell">                       <span class="n" style="color: #333;">ensureMonoType</span> <span class="n" style="color: #333;">act_res_ty</span></span>

</pre>

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536

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<pre style="margin: 0;">+<span id="LC536" class="line" lang="haskell">                     <span class="p">;</span> <span class="n" style="color: #333;">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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537

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<pre style="margin: 0;">+<span id="LC537" class="line" lang="haskell">            <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="538" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

538

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<pre style="margin: 0;">+<span id="LC538" 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>

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<pre style="margin: 0;">+<span id="LC539" 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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<pre style="margin: 0;">+<span id="LC540" 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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<pre style="margin: 0;">+<span id="LC541" 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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<pre style="margin: 0;">+<span id="LC542" 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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543

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<pre style="margin: 0;">+<span id="LC543" class="line" lang="haskell">     <span class="p">}</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC544" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC545" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC546" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [fillInferResult]</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC547" 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="LC548" 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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<pre style="margin: 0;">+<span id="LC549" 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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<pre style="margin: 0;">+<span id="LC550" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">                         , ir_lvl  :: TcLevel</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC551" 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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<pre style="margin: 0;">+<span id="LC552" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC553" 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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554

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<pre style="margin: 0;">+<span id="LC554" class="line" lang="haskell"></span>

</pre>

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555

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<pre style="margin: 0;">+<span id="LC555" 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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<pre style="margin: 0;">+<span id="LC556" 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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557

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<pre style="margin: 0;">+<span id="LC557" 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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558

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<pre style="margin: 0;">+<span id="LC558" class="line" lang="haskell"></span>

</pre>

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559

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<pre style="margin: 0;">+<span id="LC559" 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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560

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<pre style="margin: 0;">+<span id="LC560" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">     case e of</span></span>

</pre>

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561

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<pre style="margin: 0;">+<span id="LC561" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        T1 -> e1</span></span>

</pre>

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562

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<pre style="margin: 0;">+<span id="LC562" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        T2 -> e2</span></span>

</pre>

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563

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<pre style="margin: 0;">+<span id="LC563" class="line" lang="haskell"></span>

</pre>

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564

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<pre style="margin: 0;">+<span id="LC564" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Our typing rules are:</span></span>

</pre>

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565

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<pre style="margin: 0;">+<span id="LC565" class="line" lang="haskell"></span>

</pre>

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566

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<pre style="margin: 0;">+<span id="LC566" 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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567

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<pre style="margin: 0;">+<span id="LC567" 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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568

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<pre style="margin: 0;">+<span id="LC568" class="line" lang="haskell"></span>

</pre>

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569

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<pre style="margin: 0;">+<span id="LC569" 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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570

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<pre style="margin: 0;">+<span id="LC570" 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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571

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<pre style="margin: 0;">+<span id="LC571" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">      case e of</span></span>

</pre>

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572

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<pre style="margin: 0;">+<span id="LC572" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        True  -> hr</span></span>

</pre>

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573

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<pre style="margin: 0;">+<span id="LC573" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        False -> hr</span></span>

</pre>

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574

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<pre style="margin: 0;">+<span id="LC574" 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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575

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<pre style="margin: 0;">+<span id="LC575" 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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576

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<pre style="margin: 0;">+<span id="LC576" 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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577

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<pre style="margin: 0;">+<span id="LC577" 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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578

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<pre style="margin: 0;">+<span id="LC578" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="579" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

579

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<pre style="margin: 0;">+<span id="LC579" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  But note that</span></span>

</pre>

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580

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<pre style="margin: 0;">+<span id="LC580" 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="581" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

581

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<pre style="margin: 0;">+<span id="LC581" 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="582" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

582

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<pre style="margin: 0;">+<span id="LC582" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        False -> \x -> hr x</span></span>

</pre>

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583

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<pre style="margin: 0;">+<span id="LC583" 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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584

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<pre style="margin: 0;">+<span id="LC584" 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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585

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<pre style="margin: 0;">+<span id="LC585" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  (forall a. a->a)</span></span>

</pre>

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586

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<pre style="margin: 0;">+<span id="LC586" class="line" lang="haskell"></span>

</pre>

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587

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<pre style="margin: 0;">+<span id="LC587" 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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588

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<pre style="margin: 0;">+<span id="LC588" 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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589

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<pre style="margin: 0;">+<span id="LC589" 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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590

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<pre style="margin: 0;">+<span id="LC590" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="591" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

591

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<pre style="margin: 0;">+<span id="LC591" 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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<td class="diff-line-num new new_line" data-linenumber="592" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

592

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<pre style="margin: 0;">+<span id="LC592" 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="593" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

593

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<pre style="margin: 0;">+<span id="LC593" 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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<td class="diff-line-num new new_line" data-linenumber="594" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

594

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<pre style="margin: 0;">+<span id="LC594" 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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<td class="diff-line-num new new_line" data-linenumber="595" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

595

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<pre style="margin: 0;">+<span id="LC595" 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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<td class="diff-line-num new new_line" data-linenumber="596" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

596

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<pre style="margin: 0;">+<span id="LC596" 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="597" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

597

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<pre style="margin: 0;">+<span id="LC597" 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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<pre style="margin: 0;">+<span id="LC598" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">alpha is untouchable until the equality floats out.</span></span>

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<pre style="margin: 0;">+<span id="LC599" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC600" class="line" lang="haskell"><span class="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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<pre style="margin: 0;">+<span id="LC601" 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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<pre style="margin: 0;">+<span id="LC602" 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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<pre style="margin: 0;">+<span id="LC603" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">    already there</span></span>

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<pre style="margin: 0;">+<span id="LC604" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC605" 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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<pre style="margin: 0;">+<span id="LC606" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   case e of</span></span>

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<pre style="margin: 0;">+<span id="LC607" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">      T1 -> e1 :: (forall a. a->a) -> Int</span></span>

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<pre style="margin: 0;">+<span id="LC608" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">      G2 -> e2</span></span>

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<pre style="margin: 0;">+<span id="LC609" 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>

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<pre style="margin: 0;">+<span id="LC610" 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>

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<pre style="margin: 0;">+<span id="LC611" 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>

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<pre style="margin: 0;">+<span id="LC612" 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>

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<pre style="margin: 0;">+<span id="LC613" 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>

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<pre style="margin: 0;">+<span id="LC614" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">monotype.</span></span>

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<pre style="margin: 0;">+<span id="LC615" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC616" 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>

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<pre style="margin: 0;">+<span id="LC617" 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>

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<td class="diff-line-num new new_line" data-linenumber="618" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

618

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<pre style="margin: 0;">+<span id="LC618" 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>

<td class="diff-line-num new new_line" data-linenumber="619" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

619

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<pre style="margin: 0;">+<span id="LC619" 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>

<td class="diff-line-num new new_line" data-linenumber="620" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

620

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<pre style="margin: 0;">+<span id="LC620" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_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">

621

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<pre style="margin: 0;">+<span id="LC621" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>

</pre>

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499

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<td class="diff-line-num new_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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<pre style="margin: 0;"> <span id="LC622" class="line" lang="haskell"></span>

</pre>

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500

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623

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<pre style="margin: 0;"> <span id="LC623" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *********************************************************************</span></span>

</pre>

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501

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624

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<pre style="margin: 0;"> <span id="LC624" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">*                                                                      *</span></span>

</pre>

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502

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<td class="diff-line-num new_line old" data-linenumber="625" 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="LC502" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        <span class="idiff left right">SkolemTvs (immutable)</span></span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="625" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

625

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<pre style="margin: 0;">+<span id="LC625" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        <span class="idiff left right">      Promoting types</span></span></span>

</pre>

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503

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<pre style="margin: 0;"> <span id="LC626" 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="504" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

504

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<pre style="margin: 0;"> <span id="LC627" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">********************************************************************* -}</span></span>

</pre>

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505

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<td class="diff-line-num new_line" data-linenumber="628" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

628

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<pre style="margin: 0;"> <span id="LC628" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">-<span id="LC506" class="line" lang="haskell"><span class="n" style="color: #333;">tc_inst_internal</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">VarBndr</span> <span class="kt" style="color: #458; font-weight: 600;">TyVar</span> <span class="n" style="color: #333;">flag</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;">TCvSubst</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">VarBndr</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span> <span class="n" style="color: #333;">flag</span><span class="p">]))</span></span>

</pre>

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507

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<pre style="margin: 0;">-<span id="LC507" class="line" lang="haskell">                        <span class="c1" style="color: #998; font-style: italic;">-- ^ How to instantiate the type variables</span></span>

</pre>

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508

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<pre style="margin: 0;">-<span id="LC508" 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;">VarBndr</span> <span class="kt" style="color: #458; font-weight: 600;">TyVar</span> <span class="n" style="color: #333;">flag</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Type variable to instantiate</span></span>

</pre>

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509

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<pre style="margin: 0;">-<span id="LC509" class="line" lang="haskell">                 <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span>                 <span class="c1" style="color: #998; font-style: italic;">-- ^ rho</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="510" 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">

510

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<pre style="margin: 0;">-<span id="LC510" 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;">Name</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">VarBndr</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span> <span class="n" style="color: #333;">flag</span><span class="p">)],</span> <span class="kt" style="color: #458; font-weight: 600;">TcThetaType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Result</span></span>

</pre>

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511

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<pre style="margin: 0;">-<span id="LC511" class="line" lang="haskell">                       <span class="c1" style="color: #998; font-style: italic;">-- (type vars, preds (incl equalities), rho)</span></span>

</pre>

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512

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<pre style="margin: 0;">-<span id="LC512" class="line" lang="haskell"><span class="n" style="color: #333;">tc_inst_internal</span> <span class="n" style="color: #333;">_inst_tyvars</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span>     <span class="n" style="color: #333;">rho</span> <span class="o" style="font-weight: 600;">=</span></span>

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<pre style="margin: 0;">-<span id="LC513" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">let</span> <span class="c1" style="color: #998; font-style: italic;">-- There may be overloading despite no type variables;</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC514" class="line" lang="haskell">      <span class="c1" style="color: #998; font-style: italic;">--      (?x :: Int) => Int -> Int</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC515" class="line" lang="haskell">    <span class="p">(</span><span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcSplitPhiTy</span> <span class="n" style="color: #333;">rho</span></span>

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<pre style="margin: 0;">-<span id="LC516" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">in</span></span>

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<pre style="margin: 0;">-<span id="LC517" class="line" lang="haskell">    <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">,</span> <span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC518" class="line" lang="haskell"><span class="n" style="color: #333;">tc_inst_internal</span>  <span class="n" style="color: #333;">inst_tyvars</span> <span class="n" style="color: #333;">tyvars</span> <span class="n" style="color: #333;">rho</span> <span class="o" style="font-weight: 600;">=</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC519" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">subst</span><span class="p">,</span> <span class="n" style="color: #333;">tyvars'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">inst_tyvars</span> <span class="n" style="color: #333;">tyvars</span></span>

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<pre style="margin: 0;">-<span id="LC520" 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;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcSplitPhiTy</span> <span class="p">(</span><span class="n" style="color: #333;">substTyAddInScope</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">rho</span><span class="p">)</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC521" class="line" lang="haskell">           <span class="n" style="color: #333;">tv_prs</span>       <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="n" style="color: #333;">tyVarName</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">binderVar</span><span class="p">)</span> <span class="n" style="color: #333;">tyvars</span> <span class="p">`</span><span class="n" style="color: #333;">zip</span><span class="p">`</span> <span class="n" style="color: #333;">tyvars'</span></span>

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<pre style="margin: 0;">-<span id="LC522" 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;">tv_prs</span><span class="p">,</span> <span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span> <span class="p">}</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC523" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">-<span id="LC524" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstType</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">]))</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC525" class="line" lang="haskell">                   <span class="c1" style="color: #998; font-style: italic;">-- ^ How to instantiate the type variables</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC526" class="line" lang="haskell">           <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span>                                           <span class="c1" style="color: #998; font-style: italic;">-- ^ Type to instantiate</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC527" 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;">Name</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">)],</span> <span class="kt" style="color: #458; font-weight: 600;">TcThetaType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Result</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC528" class="line" lang="haskell">                <span class="c1" style="color: #998; font-style: italic;">-- (type vars, preds (incl equalities), rho)</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC529" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstType</span> <span class="n" style="color: #333;">inst_tyvars</span> <span class="n" style="color: #333;">id</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="530" 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">

530

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<pre style="margin: 0;">-<span id="LC530" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">tyvars</span><span class="p">,</span> <span class="n" style="color: #333;">rho</span><span class="p">)</span>    <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitForAllTys</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">id</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="531" 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">

531

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<pre style="margin: 0;">-<span id="LC531" class="line" lang="haskell">           <span class="n" style="color: #333;">tyvars'</span>          <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyVarBinders</span> <span class="nb" style="color: #0086b3;">()</span> <span class="n" style="color: #333;">tyvars</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="532" 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">

532

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<pre style="margin: 0;">-<span id="LC532" class="line" lang="haskell">     <span class="p">;</span>     <span class="p">(</span><span class="n" style="color: #333;">tv_prs</span><span class="p">,</span> <span class="n" style="color: #333;">preds</span><span class="p">,</span> <span class="n" style="color: #333;">rho</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tc_inst_internal</span> <span class="n" style="color: #333;">inst_tyvar_bndrs</span> <span class="n" style="color: #333;">tyvars'</span> <span class="n" style="color: #333;">rho</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="533" 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">

533

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<pre style="margin: 0;">-<span id="LC533" class="line" lang="haskell">     <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">tv_prs'</span>          <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="p">(</span><span class="n" style="color: #333;">name</span><span class="p">,</span> <span class="n" style="color: #333;">bndr</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">name</span><span class="p">,</span> <span class="n" style="color: #333;">binderVar</span> <span class="n" style="color: #333;">bndr</span><span class="p">))</span> <span class="n" style="color: #333;">tv_prs</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="534" 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">

534

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<pre style="margin: 0;">-<span id="LC534" class="line" lang="haskell">     <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">tv_prs'</span><span class="p">,</span> <span class="n" style="color: #333;">preds</span><span class="p">,</span> <span class="n" style="color: #333;">rho</span><span class="p">)</span> <span class="p">}</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="535" 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">

535

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<pre style="margin: 0;">-<span id="LC535" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="536" 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">

536

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<pre style="margin: 0;">-<span id="LC536" class="line" lang="haskell">    <span class="n" style="color: #333;">inst_tyvar_bndrs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">VarBndr</span> <span class="kt" style="color: #458; font-weight: 600;">TyVar</span> <span class="nb" style="color: #0086b3;">()</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;">TCvSubst</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">VarBndr</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span> <span class="nb" style="color: #0086b3;">()</span><span class="p">])</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="537" 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">

537

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<pre style="margin: 0;">-<span id="LC537" class="line" lang="haskell">    <span class="n" style="color: #333;">inst_tyvar_bndrs</span> <span class="n" style="color: #333;">bndrs</span> <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;">subst</span><span class="p">,</span> <span class="n" style="color: #333;">tvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">inst_tyvars</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">binderVars</span> <span class="n" style="color: #333;">bndrs</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="538" 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">

538

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<pre style="margin: 0;">-<span id="LC538" class="line" lang="haskell">                                <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">tvbnds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bndr</span> <span class="n" style="color: #333;">tv</span> <span class="nb" style="color: #0086b3;">()</span><span class="p">)</span> <span class="n" style="color: #333;">tvs</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="539" 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">

539

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<pre style="margin: 0;">-<span id="LC539" class="line" lang="haskell">                                <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">subst</span><span class="p">,</span> <span class="n" style="color: #333;">tvbnds</span><span class="p">)</span> <span class="p">}</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="540" 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">

540

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<pre style="margin: 0;">-<span id="LC540" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="541" 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">

541

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<pre style="margin: 0;">-<span id="LC541" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstTypeBndrs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">VarBndr</span> <span class="kt" style="color: #458; font-weight: 600;">TyVar</span> <span class="kt" style="color: #458; font-weight: 600;">Specificity</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;">TCvSubst</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">VarBndr</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span> <span class="kt" style="color: #458; font-weight: 600;">Specificity</span><span class="p">]))</span></span>

</pre>

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542

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<pre style="margin: 0;">-<span id="LC542" class="line" lang="haskell">                        <span class="c1" style="color: #998; font-style: italic;">-- ^ How to instantiate the type variables</span></span>

</pre>

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543

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<pre style="margin: 0;">-<span id="LC543" class="line" lang="haskell">                <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span>                                                               <span class="c1" style="color: #998; font-style: italic;">-- ^ Type to instantiate</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC544" class="line" lang="haskell">                <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">([(</span><span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">VarBndr</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span> <span class="kt" style="color: #458; font-weight: 600;">Specificity</span><span class="p">)],</span> <span class="kt" style="color: #458; font-weight: 600;">TcThetaType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Result</span></span>

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<pre style="margin: 0;">-<span id="LC545" class="line" lang="haskell">                     <span class="c1" style="color: #998; font-style: italic;">-- (type vars, preds (incl equalities), rho)</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC546" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstTypeBndrs</span> <span class="n" style="color: #333;">inst_tyvars</span> <span class="n" style="color: #333;">id</span> <span class="o" style="font-weight: 600;">=</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC547" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">tyvars</span><span class="p">,</span> <span class="n" style="color: #333;">rho</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitForAllTysInvis</span> <span class="p">(</span><span class="n" style="color: #333;">idType</span> <span class="n" style="color: #333;">id</span><span class="p">)</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC548" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">in</span> <span class="n" style="color: #333;">tc_inst_internal</span> <span class="n" style="color: #333;">inst_tyvars</span> <span class="n" style="color: #333;">tyvars</span> <span class="n" style="color: #333;">rho</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC549" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">-<span id="LC550" class="line" lang="haskell"><span class="n" style="color: #333;">tcSkolDFunType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DFunId</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;">TcTyVar</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">TcThetaType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">)</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC551" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Instantiate a type signature with skolem constants.</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC552" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We could give them fresh names, but no need to do so</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC553" class="line" lang="haskell"><span class="n" style="color: #333;">tcSkolDFunType</span> <span class="n" style="color: #333;">dfun</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC554" 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;">tv_prs</span><span class="p">,</span> <span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInstType</span> <span class="n" style="color: #333;">tcInstSuperSkolTyVars</span> <span class="n" style="color: #333;">dfun</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC555" 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;">map</span> <span class="n" style="color: #333;">snd</span> <span class="n" style="color: #333;">tv_prs</span><span class="p">,</span> <span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span> <span class="p">}</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC556" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="557" 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="LC557" class="line" lang="haskell"><span class="n" style="color: #333;">tcSuperSkolTyVars</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">])</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="558" 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="LC558" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Make skolem constants, but do *not* give them new names, as above</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="559" 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="LC559" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Moreover, make them "super skolems"; see comments with superSkolemTv</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="560" 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">

560

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<pre style="margin: 0;">-<span id="LC560" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- see Note [Kind substitution when instantiating]</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC561" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Precondition: tyvars should be ordered by scoping</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC562" class="line" lang="haskell"><span class="n" style="color: #333;">tcSuperSkolTyVars</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapAccumL</span> <span class="n" style="color: #333;">tcSuperSkolTyVar</span> <span class="n" style="color: #333;">emptyTCvSubst</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC563" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">-<span id="LC564" class="line" lang="haskell"><span class="n" style="color: #333;">tcSuperSkolTyVar</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">)</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC565" class="line" lang="haskell"><span class="n" style="color: #333;">tcSuperSkolTyVar</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tv</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC566" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">extendTvSubstWithClone</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">new_tv</span><span class="p">,</span> <span class="n" style="color: #333;">new_tv</span><span class="p">)</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC567" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC568" class="line" lang="haskell">    <span class="n" style="color: #333;">kind</span>   <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substTyUnchecked</span> <span class="n" style="color: #333;">subst</span> <span class="p">(</span><span class="n" style="color: #333;">tyVarKind</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC569" class="line" lang="haskell">    <span class="n" style="color: #333;">new_tv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTcTyVar</span> <span class="p">(</span><span class="n" style="color: #333;">tyVarName</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span> <span class="n" style="color: #333;">kind</span> <span class="n" style="color: #333;">superSkolemTv</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC570" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">-<span id="LC571" class="line" lang="haskell"><span class="cd">-- | Given a list of @['TyVar']@, skolemize the type variables,</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC572" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- returning a substitution mapping the original tyvars to the</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC573" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- skolems, and the list of newly bound skolems.</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC574" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstSkolTyVars</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">])</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC575" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Skolemising type variables]</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC576" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstSkolTyVars</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcInstSkolTyVarsX</span> <span class="n" style="color: #333;">emptyTCvSubst</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC577" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">-<span id="LC578" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstSkolTyVarsX</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">])</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="579" 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">

579

</td>

<td class="diff-line-num new_line old" data-linenumber="629" 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="LC579" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Skolemising type variables]</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="580" 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">

580

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<td class="diff-line-num new_line old" data-linenumber="629" 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="LC580" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstSkolTyVarsX</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcInstSkolTyVarsPushLevel</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="581" 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">

581

</td>

<td class="diff-line-num new_line old" data-linenumber="629" 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="LC581" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="582" 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">

582

</td>

<td class="diff-line-num new_line old" data-linenumber="629" 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="LC582" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstSuperSkolTyVars</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">])</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="583" 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">

583

</td>

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<pre style="margin: 0;">-<span id="LC583" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Skolemising type variables]</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="584" 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">

584

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<pre style="margin: 0;">-<span id="LC584" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstSuperSkolTyVars</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcInstSuperSkolTyVarsX</span> <span class="n" style="color: #333;">emptyTCvSubst</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="585" 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">

585

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<pre style="margin: 0;">-<span id="LC585" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="586" 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">

586

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<pre style="margin: 0;">-<span id="LC586" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstSuperSkolTyVarsX</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">])</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="587" 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">

587

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<td class="diff-line-num new_line old" data-linenumber="629" 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="LC587" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Skolemising type variables]</span></span>

</pre>

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588

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<pre style="margin: 0;">-<span id="LC588" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstSuperSkolTyVarsX</span> <span class="n" style="color: #333;">subst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcInstSkolTyVarsPushLevel</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="n" style="color: #333;">subst</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="589" 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">

589

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<td class="diff-line-num new_line old" data-linenumber="629" 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="LC589" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="590" 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">

590

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<pre style="margin: 0;">-<span id="LC590" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstSkolTyVarsPushLevel</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="591" 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">

591

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<pre style="margin: 0;">-<span id="LC591" class="line" lang="haskell">                          <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">])</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="592" 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">

592

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<pre style="margin: 0;">-<span id="LC592" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Skolemise one level deeper, hence pushTcLevel</span></span>

</pre>

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

593

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<td class="diff-line-num new_line old" data-linenumber="629" 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="LC593" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Skolemising type variables]</span></span>

</pre>

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594

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<pre style="margin: 0;">-<span id="LC594" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstSkolTyVarsPushLevel</span> <span class="n" style="color: #333;">overlappable</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tvs</span></span>

</pre>

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595

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<pre style="margin: 0;">-<span id="LC595" 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;">tc_lvl</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getTcLevel</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC596" class="line" lang="haskell">       <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">pushed_lvl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pushTcLevel</span> <span class="n" style="color: #333;">tc_lvl</span></span>

</pre>

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597

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<pre style="margin: 0;">-<span id="LC597" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">tcInstSkolTyVarsAt</span> <span class="n" style="color: #333;">pushed_lvl</span> <span class="n" style="color: #333;">overlappable</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tvs</span> <span class="p">}</span></span>

</pre>

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598

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<pre style="margin: 0;">-<span id="LC598" class="line" lang="haskell"></span>

</pre>

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599

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<pre style="margin: 0;">-<span id="LC599" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstSkolTyVarsAt</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;">Bool</span></span>

</pre>

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600

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<pre style="margin: 0;">-<span id="LC600" class="line" lang="haskell">                   <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="601" 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">

601

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<pre style="margin: 0;">-<span id="LC601" class="line" lang="haskell">                   <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">])</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="602" 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">

602

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<pre style="margin: 0;">-<span id="LC602" class="line" lang="haskell"><span class="n" style="color: #333;">tcInstSkolTyVarsAt</span> <span class="n" style="color: #333;">lvl</span> <span class="n" style="color: #333;">overlappable</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tvs</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="603" 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">

603

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<pre style="margin: 0;">-<span id="LC603" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">freshenTyCoVarsX</span> <span class="n" style="color: #333;">new_skol_tv</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tvs</span></span>

</pre>

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629

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<pre style="margin: 0;">+<span id="LC629" 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;">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>

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<td class="diff-line-num new new_line" data-linenumber="630" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

630

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<pre style="margin: 0;">+<span id="LC630" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Assuming that the argument type is of kind (TYPE r),</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="631" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

631

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<pre style="margin: 0;">+<span id="LC631" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ensure that it is a /monotype/</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="632" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

632

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<pre style="margin: 0;">+<span id="LC632" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If it is not a monotype we can see right away (since unification</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="633" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

633

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<pre style="margin: 0;">+<span id="LC633" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- varibles and type-function applications stand for monotypes), but</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="634" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

634

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<pre style="margin: 0;">+<span id="LC634" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- we emit a Wanted equality just to delay the error message until later</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="635" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

635

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<pre style="margin: 0;">+<span id="LC635" class="line" lang="haskell"><span class="n" style="color: #333;">ensureMonoType</span> <span class="n" style="color: #333;">res_ty</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="636" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

636

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<pre style="margin: 0;">+<span id="LC636" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTauTy</span> <span class="n" style="color: #333;">res_ty</span>   <span class="c1" style="color: #998; font-style: italic;">-- isTauTy doesn't need zonking or anything</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="637" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

637

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<pre style="margin: 0;">+<span id="LC637" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC638" 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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639

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<pre style="margin: 0;">+<span id="LC639" 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;">mono_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newOpenFlexiTyVarTy</span></span>

</pre>

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640

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<pre style="margin: 0;">+<span id="LC640" 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>

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<pre style="margin: 0;">+<span id="LC641" 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>

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642

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<pre style="margin: 0;">+<span id="LC642" 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>

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643

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<pre style="margin: 0;">+<span id="LC643" 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>

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644

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<pre style="margin: 0;">+<span id="LC644" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="645" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

645

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<pre style="margin: 0;">+<span id="LC645" 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>

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<pre style="margin: 0;">+<span id="LC646" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span> <span class="p">}</span></span>

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<pre style="margin: 0;">+<span id="LC647" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC648" 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>

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<pre style="margin: 0;">+<span id="LC649" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Promoting a type]</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC650" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See also Note [fillInferResult]</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC651" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- promoteTcType level ty = (co, ty')</span></span>

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<pre style="margin: 0;">+<span id="LC652" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--   * Returns ty'  whose max level is just 'level'</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC653" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--             and  whose kind is ~# to the kind of 'ty'</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC654" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--             and  whose kind has form TYPE rr</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC655" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--   * and co :: ty ~ ty'</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="656" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

656

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<pre style="margin: 0;">+<span id="LC656" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--   * and emits constraints to justify the coercion</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="657" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

657

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<pre style="margin: 0;">+<span id="LC657" class="line" lang="haskell"><span class="n" style="color: #333;">promoteTcType</span> <span class="n" style="color: #333;">dest_lvl</span> <span class="n" style="color: #333;">ty</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="658" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

658

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<pre style="margin: 0;">+<span id="LC658" 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>

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</td>

<td class="diff-line-num new new_line" data-linenumber="659" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

659

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<pre style="margin: 0;">+<span id="LC659" class="line" lang="haskell">       <span class="p">;</span> <span class="kr" style="font-weight: 600;">if</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>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="604" style="width: 35px; color: rgba(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="660" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

660

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<pre style="margin: 0;">+<span id="LC660" class="line" lang="haskell">         <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">dont_promote_it</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="661" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

661

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<pre style="margin: 0;">+<span id="LC661" class="line" lang="haskell">         <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">promote_it</span> <span class="p">}</span></span>

</pre>

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604

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<td class="diff-line-num new_line" data-linenumber="662" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

662

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<pre style="margin: 0;"> <span id="LC662" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="605" 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">

605

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<pre style="margin: 0;">-<span id="LC605" class="line" lang="haskell">    <span class="n" style="color: #333;">details</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SkolemTv</span> <span class="n" style="color: #333;">lvl</span> <span class="n" style="color: #333;">overlappable</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="606" 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">

606

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<pre style="margin: 0;">-<span id="LC606" class="line" lang="haskell">    <span class="n" style="color: #333;">new_skol_tv</span> <span class="n" style="color: #333;">name</span> <span class="n" style="color: #333;">kind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTcTyVar</span> <span class="n" style="color: #333;">name</span> <span class="n" style="color: #333;">kind</span> <span class="n" style="color: #333;">details</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="607" 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">

607

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<pre style="margin: 0;">-<span id="LC607" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="608" 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">

608

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<pre style="margin: 0;">-<span id="LC608" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">------------------</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="609" 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">

609

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<pre style="margin: 0;">-<span id="LC609" class="line" lang="haskell"><span class="n" style="color: #333;">freshenTyVarBndrs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">])</span></span>

</pre>

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

610

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<pre style="margin: 0;">-<span id="LC610" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ^ Give fresh uniques to a bunch of TyVars, but they stay</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="611" 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">

611

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<pre style="margin: 0;">-<span id="LC611" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--   as TyVars, rather than becoming TcTyVars</span></span>

</pre>

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

612

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<pre style="margin: 0;">-<span id="LC612" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Used in 'GHC.Tc.Instance.Family.newFamInst', and 'GHC.Tc.Utils.Instantiate.newClsInst'</span></span>

</pre>

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

613

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<pre style="margin: 0;">-<span id="LC613" class="line" lang="haskell"><span class="n" style="color: #333;">freshenTyVarBndrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">freshenTyCoVars</span> <span class="n" style="color: #333;">mkTyVar</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="614" 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">

614

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<td class="diff-line-num new_line old" data-linenumber="663" 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="LC614" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="615" 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">

615

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<pre style="margin: 0;">-<span id="LC615" class="line" lang="haskell"><span class="n" style="color: #333;">freshenCoVarBndrsX</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoVar</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;">TCvSubst</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">CoVar</span><span class="p">])</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="616" 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">

616

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<pre style="margin: 0;">-<span id="LC616" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ^ Give fresh uniques to a bunch of CoVars</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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<td class="diff-line-num new_line old" data-linenumber="663" 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="LC617" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Used in "GHC.Tc.Instance.Family.newFamInst"</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

</td>

<td class="diff-line-num new_line old" data-linenumber="663" 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="LC618" class="line" lang="haskell"><span class="n" style="color: #333;">freshenCoVarBndrsX</span> <span class="n" style="color: #333;">subst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">freshenTyCoVarsX</span> <span class="n" style="color: #333;">mkCoVar</span> <span class="n" style="color: #333;">subst</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="663" 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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<td class="diff-line-num new_line old" data-linenumber="663" 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="LC620" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">------------------</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="621" 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">

621

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<td class="diff-line-num new_line old" data-linenumber="663" 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="LC621" class="line" lang="haskell"><span class="n" style="color: #333;">freshenTyCoVars</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Kind</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCoVar</span><span class="p">)</span></span>

</pre>

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

622

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<td class="diff-line-num new_line old" data-linenumber="663" 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="LC622" 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;">TyVar</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;">TCvSubst</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyCoVar</span><span class="p">])</span></span>

</pre>

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

623

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<td class="diff-line-num new_line old" data-linenumber="663" 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="LC623" class="line" lang="haskell"><span class="n" style="color: #333;">freshenTyCoVars</span> <span class="n" style="color: #333;">mk_tcv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">freshenTyCoVarsX</span> <span class="n" style="color: #333;">mk_tcv</span> <span class="n" style="color: #333;">emptyTCvSubst</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="624" 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">

624

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<pre style="margin: 0;">-<span id="LC624" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="625" 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">

625

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<pre style="margin: 0;">-<span id="LC625" class="line" lang="haskell"><span class="n" style="color: #333;">freshenTyCoVarsX</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Kind</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCoVar</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="626" 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">

626

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<td class="diff-line-num new_line old" data-linenumber="663" 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="LC626" class="line" lang="haskell">                 <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyCoVar</span><span class="p">]</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="627" 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">

627

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<td class="diff-line-num new_line old" data-linenumber="663" 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="LC627" 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;">TCvSubst</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TyCoVar</span><span class="p">])</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="628" 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">

628

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<td class="diff-line-num new_line old" data-linenumber="663" 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="LC628" class="line" lang="haskell"><span class="n" style="color: #333;">freshenTyCoVarsX</span> <span class="n" style="color: #333;">mk_tcv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapAccumLM</span> <span class="p">(</span><span class="n" style="color: #333;">freshenTyCoVarX</span> <span class="n" style="color: #333;">mk_tcv</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="629" 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">

629

</td>

<td class="diff-line-num new_line old" data-linenumber="663" 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="LC629" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="630" 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">

630

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<td class="diff-line-num new_line old" data-linenumber="663" 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="LC630" class="line" lang="haskell"><span class="n" style="color: #333;">freshenTyCoVarX</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Kind</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCoVar</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="631" 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">

631

</td>

<td class="diff-line-num new_line old" data-linenumber="663" 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="LC631" class="line" lang="haskell">                <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyCoVar</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;">TCvSubst</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TyCoVar</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="632" 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">

632

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<td class="diff-line-num new_line old" data-linenumber="663" 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="LC632" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This a complete freshening operation:</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC633" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the skolems have a fresh unique, and a location from the monad</span></span>

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<pre style="margin: 0;">-<span id="LC634" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Skolemising type variables]</span></span>

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<pre style="margin: 0;">-<span id="LC635" class="line" lang="haskell"><span class="n" style="color: #333;">freshenTyCoVarX</span> <span class="n" style="color: #333;">mk_tcv</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tycovar</span></span>

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<pre style="margin: 0;">-<span id="LC636" 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;">loc</span>  <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getSrcSpanM</span></span>

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<pre style="margin: 0;">-<span id="LC637" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">uniq</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newUnique</span></span>

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<pre style="margin: 0;">-<span id="LC638" class="line" lang="haskell">       <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">old_name</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyVarName</span> <span class="n" style="color: #333;">tycovar</span></span>

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<pre style="margin: 0;">-<span id="LC639" class="line" lang="haskell">             <span class="n" style="color: #333;">new_name</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkInternalName</span> <span class="n" style="color: #333;">uniq</span> <span class="p">(</span><span class="n" style="color: #333;">getOccName</span> <span class="n" style="color: #333;">old_name</span><span class="p">)</span> <span class="n" style="color: #333;">loc</span></span>

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<pre style="margin: 0;">-<span id="LC640" class="line" lang="haskell">             <span class="n" style="color: #333;">new_kind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">substTyUnchecked</span> <span class="n" style="color: #333;">subst</span> <span class="p">(</span><span class="n" style="color: #333;">tyVarKind</span> <span class="n" style="color: #333;">tycovar</span><span class="p">)</span></span>

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<pre style="margin: 0;">-<span id="LC641" class="line" lang="haskell">             <span class="n" style="color: #333;">new_tcv</span>  <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mk_tcv</span> <span class="n" style="color: #333;">new_name</span> <span class="n" style="color: #333;">new_kind</span></span>

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<pre style="margin: 0;">-<span id="LC642" class="line" lang="haskell">             <span class="n" style="color: #333;">subst1</span>   <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendTCvSubstWithClone</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tycovar</span> <span class="n" style="color: #333;">new_tcv</span></span>

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<pre style="margin: 0;">-<span id="LC643" 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;">subst1</span><span class="p">,</span> <span class="n" style="color: #333;">new_tcv</span><span class="p">)</span> <span class="p">}</span></span>

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<pre style="margin: 0;">-<span id="LC644" class="line" lang="haskell"></span>

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<pre style="margin: 0;">-<span id="LC645" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Skolemising type variables]</span></span>

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<pre style="margin: 0;">-<span id="LC646" 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="LC647" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The tcInstSkolTyVars family of functions instantiate a list of TyVars</span></span>

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<pre style="margin: 0;">-<span id="LC648" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to fresh skolem TcTyVars. Important notes:</span></span>

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<pre style="margin: 0;">-<span id="LC649" class="line" lang="haskell"></span>

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<pre style="margin: 0;">-<span id="LC650" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">a) Level allocation. We generally skolemise /before/ calling</span></span>

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<pre style="margin: 0;">-<span id="LC651" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   pushLevelAndCaptureConstraints.  So we want their level to the level</span></span>

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<pre style="margin: 0;">-<span id="LC652" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   of the soon-to-be-created implication, which has a level ONE HIGHER</span></span>

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<pre style="margin: 0;">-<span id="LC653" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   than the current level.  Hence the pushTcLevel.  It feels like a</span></span>

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654

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<pre style="margin: 0;">-<span id="LC654" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   slight hack.</span></span>

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655

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<pre style="margin: 0;">-<span id="LC655" class="line" lang="haskell"></span>

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<pre style="margin: 0;">-<span id="LC656" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">b) The [TyVar] should be ordered (kind vars first)</span></span>

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<pre style="margin: 0;">-<span id="LC657" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   See Note [Kind substitution when instantiating]</span></span>

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<pre style="margin: 0;">-<span id="LC658" class="line" lang="haskell"></span>

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<pre style="margin: 0;">-<span id="LC659" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">c) It's a complete freshening operation: the skolems have a fresh</span></span>

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<pre style="margin: 0;">-<span id="LC660" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   unique, and a location from the monad</span></span>

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<pre style="margin: 0;">-<span id="LC661" class="line" lang="haskell"></span>

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<pre style="margin: 0;">-<span id="LC662" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">d) The resulting skolems are</span></span>

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663

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<pre style="margin: 0;">-<span id="LC663" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        non-overlappable for tcInstSkolTyVars,</span></span>

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664

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<pre style="margin: 0;">-<span id="LC664" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   but overlappable for tcInstSuperSkolTyVars</span></span>

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<pre style="margin: 0;">-<span id="LC665" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   See GHC.Tc.Deriv.Infer Note [Overlap and deriving] for an example</span></span>

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<pre style="margin: 0;">-<span id="LC666" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   of where this matters.</span></span>

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<pre style="margin: 0;">-<span id="LC667" class="line" lang="haskell"></span>

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<pre style="margin: 0;">-<span id="LC668" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Kind substitution when instantiating]</span></span>

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<pre style="margin: 0;">-<span id="LC669" 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="LC670" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">When we instantiate a bunch of kind and type variables, first we</span></span>

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671

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<pre style="margin: 0;">-<span id="LC671" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">expect them to be topologically sorted.</span></span>

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<pre style="margin: 0;">-<span id="LC672" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Then we have to instantiate the kind variables, build a substitution</span></span>

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673

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<pre style="margin: 0;">-<span id="LC673" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">from old variables to the new variables, then instantiate the type</span></span>

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674

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<pre style="margin: 0;">-<span id="LC674" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">variables substituting the original kind.</span></span>

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675

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<pre style="margin: 0;">-<span id="LC675" class="line" lang="haskell"></span>

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676

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<pre style="margin: 0;">-<span id="LC676" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Exemple: If we want to instantiate</span></span>

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677

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<pre style="margin: 0;">-<span id="LC677" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  [(k1 :: *), (k2 :: *), (a :: k1 -> k2), (b :: k1)]</span></span>

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678

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<pre style="margin: 0;">-<span id="LC678" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we want</span></span>

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679

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<pre style="margin: 0;">-<span id="LC679" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  [(?k1 :: *), (?k2 :: *), (?a :: ?k1 -> ?k2), (?b :: ?k1)]</span></span>

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680

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<pre style="margin: 0;">-<span id="LC680" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">instead of the buggous</span></span>

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681

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<pre style="margin: 0;">-<span id="LC681" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  [(?k1 :: *), (?k2 :: *), (?a :: k1 -> k2), (?b :: k1)]</span></span>

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<pre style="margin: 0;">+<span id="LC663" class="line" lang="haskell">    <span class="n" style="color: #333;">promote_it</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>

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<pre style="margin: 0;">+<span id="LC664" class="line" lang="haskell">    <span class="n" style="color: #333;">promote_it</span>  <span class="c1" style="color: #998; font-style: italic;">-- Emit a constraint  (alpha :: TYPE rr) ~ ty</span></span>

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<pre style="margin: 0;">+<span id="LC665" class="line" lang="haskell">                <span class="c1" style="color: #998; font-style: italic;">-- where alpha and rr are fresh and from level dest_lvl</span></span>

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<pre style="margin: 0;">+<span id="LC666" class="line" lang="haskell">      <span class="o" style="font-weight: 600;">=</span> <span class="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;">dest_lvl</span> <span class="n" style="color: #333;">runtimeRepTy</span></span>

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667

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<pre style="margin: 0;">+<span id="LC667" class="line" lang="haskell">           <span class="p">;</span> <span class="n" style="color: #333;">prom_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newMetaTyVarTyAtLevel</span> <span class="n" style="color: #333;">dest_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>

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668

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<pre style="margin: 0;">+<span id="LC668" 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;">ty</span></span>

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<pre style="margin: 0;">+<span id="LC669" 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;">prom_ty</span></span>

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<pre style="margin: 0;">+<span id="LC670" 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>

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671

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<pre style="margin: 0;">+<span id="LC671" class="line" lang="haskell">                                        <span class="p">,</span> <span class="n" style="color: #333;">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>

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672

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<pre style="margin: 0;">+<span id="LC672" class="line" lang="haskell"></span>

</pre>

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673

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<pre style="margin: 0;">+<span id="LC673" 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;">ty</span> <span class="n" style="color: #333;">prom_ty</span></span>

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674

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<pre style="margin: 0;">+<span id="LC674" class="line" lang="haskell">           <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">co</span><span class="p">,</span> <span class="n" style="color: #333;">prom_ty</span><span class="p">)</span> <span class="p">}</span></span>

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675

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<pre style="margin: 0;">+<span id="LC675" class="line" lang="haskell"></span>

</pre>

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676

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<pre style="margin: 0;">+<span id="LC676" class="line" lang="haskell">    <span class="n" style="color: #333;">dont_promote_it</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>

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677

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<pre style="margin: 0;">+<span id="LC677" class="line" lang="haskell">    <span class="n" style="color: #333;">dont_promote_it</span>  <span class="c1" style="color: #998; font-style: italic;">-- Check that ty :: TYPE rr, for some (fresh) rr</span></span>

</pre>

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678

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<pre style="margin: 0;">+<span id="LC678" 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_kind</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newOpenTypeKind</span></span>

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679

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<pre style="margin: 0;">+<span id="LC679" class="line" lang="haskell">           <span class="p">;</span> <span class="n" style="color: #333;">ki_co</span>    <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unifyKind</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</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="n" style="color: #333;">res_kind</span></span>

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680

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<pre style="margin: 0;">+<span id="LC680" class="line" lang="haskell">           <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTcGReflRightCo</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">ki_co</span></span>

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681

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<pre style="margin: 0;">+<span id="LC681" class="line" lang="haskell">           <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">co</span><span class="p">,</span> <span class="n" style="color: #333;">ty</span> <span class="p">`</span><span class="n" style="color: #333;">mkCastTy</span><span class="p">`</span> <span class="n" style="color: #333;">ki_co</span><span class="p">)</span> <span class="p">}</span></span>

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682

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<pre style="margin: 0;">+<span id="LC682" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC683" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Promoting a type]</span></span>

</pre>

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684

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<pre style="margin: 0;">+<span id="LC684" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>

</pre>

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685

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<pre style="margin: 0;">+<span id="LC685" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider (#12427)</span></span>

</pre>

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686

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<pre style="margin: 0;">+<span id="LC686" class="line" lang="haskell"></span>

</pre>

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687

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<pre style="margin: 0;">+<span id="LC687" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  data T where</span></span>

</pre>

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688

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<pre style="margin: 0;">+<span id="LC688" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">    MkT :: (Int -> Int) -> a -> T</span></span>

</pre>

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689

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<pre style="margin: 0;">+<span id="LC689" class="line" lang="haskell"></span>

</pre>

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690

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<pre style="margin: 0;">+<span id="LC690" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  h y = case y of MkT v w -> v</span></span>

</pre>

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691

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<pre style="margin: 0;">+<span id="LC691" class="line" lang="haskell"></span>

</pre>

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692

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<pre style="margin: 0;">+<span id="LC692" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We'll infer the RHS type with an expected type ExpType of</span></span>

</pre>

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693

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<pre style="margin: 0;">+<span id="LC693" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  (IR { ir_lvl = l, ir_ref = ref, ... )</span></span>

</pre>

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694

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<pre style="margin: 0;">+<span id="LC694" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">where 'l' is the TcLevel of the RHS of 'h'.  Then the MkT pattern</span></span>

</pre>

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695

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<pre style="margin: 0;">+<span id="LC695" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">match will increase the level, so we'll end up in tcSubType, trying to</span></span>

</pre>

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696

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<pre style="margin: 0;">+<span id="LC696" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">unify the type of v,</span></span>

</pre>

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697

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<pre style="margin: 0;">+<span id="LC697" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  v :: Int -> Int</span></span>

</pre>

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698

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<pre style="margin: 0;">+<span id="LC698" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with the expected type.  But this attempt takes place at level (l+1),</span></span>

</pre>

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699

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<pre style="margin: 0;">+<span id="LC699" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">rightly so, since v's type could have mentioned existential variables,</span></span>

</pre>

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700

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<pre style="margin: 0;">+<span id="LC700" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(like w's does) and we want to catch that.</span></span>

</pre>

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701

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

</pre>

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<td class="diff-line-num new new_line" data-linenumber="702" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

702

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<pre style="margin: 0;">+<span id="LC702" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So we</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="703" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

703

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<pre style="margin: 0;">+<span id="LC703" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  - create a new meta-var alpha[l+1]</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="704" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

704

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<pre style="margin: 0;">+<span id="LC704" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  - fill in the InferRes ref cell 'ref' with alpha</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="705" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

705

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<pre style="margin: 0;">+<span id="LC705" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  - emit an equality constraint, thus</span></span>

</pre>

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706

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<pre style="margin: 0;">+<span id="LC706" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        [W] alpha[l+1] ~ (Int -> Int)</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="707" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

707

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

</pre>

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<td class="diff-line-num new new_line" data-linenumber="708" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

708

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<pre style="margin: 0;">+<span id="LC708" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">That constraint will float outwards, as it should, unless v's</span></span>

</pre>

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709

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<pre style="margin: 0;">+<span id="LC709" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">type mentions a skolem-captured variable.</span></span>

</pre>

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710

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<pre style="margin: 0;">+<span id="LC710" class="line" lang="haskell"></span>

</pre>

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711

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<pre style="margin: 0;">+<span id="LC711" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This approach fails if v has a higher rank type; see</span></span>

</pre>

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712

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<pre style="margin: 0;">+<span id="LC712" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Promotion and higher rank types]</span></span>

</pre>

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713

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<pre style="margin: 0;">+<span id="LC713" class="line" lang="haskell"></span>

</pre>

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714

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<pre style="margin: 0;">+<span id="LC714" class="line" lang="haskell"></span>

</pre>

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715

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<pre style="margin: 0;">+<span id="LC715" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Promotion and higher rank types]</span></span>

</pre>

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716

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<pre style="margin: 0;">+<span id="LC716" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>

</pre>

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717

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<pre style="margin: 0;">+<span id="LC717" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If v had a higher-rank type, say v :: (forall a. a->a) -> Int,</span></span>

</pre>

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718

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<pre style="margin: 0;">+<span id="LC718" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">then we'd emit an equality</span></span>

</pre>

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719

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<pre style="margin: 0;">+<span id="LC719" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        [W] alpha[l+1] ~ ((forall a. a->a) -> Int)</span></span>

</pre>

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720

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<pre style="margin: 0;">+<span id="LC720" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">which will sadly fail because we can't unify a unification variable</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="721" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

721

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<pre style="margin: 0;">+<span id="LC721" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with a polytype.  But there is nothing really wrong with the program</span></span>

</pre>

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722

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<pre style="margin: 0;">+<span id="LC722" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">here.</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="723" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

723

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<pre style="margin: 0;">+<span id="LC723" class="line" lang="haskell"></span>

</pre>

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724

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<pre style="margin: 0;">+<span id="LC724" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We could just about solve this by "promote the type" of v, to expose</span></span>

</pre>

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725

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<pre style="margin: 0;">+<span id="LC725" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">its polymorphic "shape" while still leaving constraints that will</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="726" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

726

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<pre style="margin: 0;">+<span id="LC726" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">prevent existential escape.  But we must be careful!  Exposing</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="727" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

727

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<pre style="margin: 0;">+<span id="LC727" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the "shape" of the type is precisely what we must NOT do under</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="728" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

728

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<pre style="margin: 0;">+<span id="LC728" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">a GADT pattern match!  So in this case we might promote the type</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="729" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

729

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<pre style="margin: 0;">+<span id="LC729" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="730" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

730

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<pre style="margin: 0;">+<span id="LC730" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        (forall a. a->a) -> alpha[l+1]</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="731" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

731

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<pre style="margin: 0;">+<span id="LC731" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and emit the constraint</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="732" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

732

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<pre style="margin: 0;">+<span id="LC732" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        [W] alpha[l+1] ~ Int</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="733" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

733

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<pre style="margin: 0;">+<span id="LC733" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Now the promoted type can fill the ref cell, while the emitted</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="734" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

734

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<pre style="margin: 0;">+<span id="LC734" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">equality can float or not, according to the usual rules.</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="735" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

735

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<pre style="margin: 0;">+<span id="LC735" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="736" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

736

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<pre style="margin: 0;">+<span id="LC736" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But that's not quite right!  We are exposing the arrow! We could</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="737" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

737

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<pre style="margin: 0;">+<span id="LC737" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">deal with that too:</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="738" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

738

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<pre style="margin: 0;">+<span id="LC738" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        (forall a. mu[l+1] a a) -> alpha[l+1]</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="739" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

739

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<pre style="margin: 0;">+<span id="LC739" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with constraints</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="740" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

740

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<pre style="margin: 0;">+<span id="LC740" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        [W] alpha[l+1] ~ Int</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="741" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

741

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<pre style="margin: 0;">+<span id="LC741" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        [W] mu[l+1] ~ (->)</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="742" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

742

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<pre style="margin: 0;">+<span id="LC742" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here we abstract over the '->' inside the forall, in case that</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="743" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

743

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<pre style="margin: 0;">+<span id="LC743" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is subject to an equality constraint from a GADT match.</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="744" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

744

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<pre style="margin: 0;">+<span id="LC744" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="745" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

745

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<pre style="margin: 0;">+<span id="LC745" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that we kept the outer (->) because that's part of</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="746" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

746

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<pre style="margin: 0;">+<span id="LC746" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the polymorphic "shape".  And because of impredicativity,</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="747" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

747

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<pre style="margin: 0;">+<span id="LC747" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GADT matches can't give equalities that affect polymorphic</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="748" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

748

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<pre style="margin: 0;">+<span id="LC748" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">shape.</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="682" style="width: 35px; color: rgba(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="749" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

749

</td>

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

<pre style="margin: 0;">+<span id="LC749" class="line" lang="haskell"></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="682" style="width: 35px; color: rgba(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="750" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

750

</td>

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

<pre style="margin: 0;">+<span id="LC750" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This reasoning just seems too complicated, so I decided not</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="682" style="width: 35px; color: rgba(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="751" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

751

</td>

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

<pre style="margin: 0;">+<span id="LC751" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to do it.  These higher-rank notes are just here to record</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="682" style="width: 35px; color: rgba(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="752" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

752

</td>

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

<pre style="margin: 0;">+<span id="LC752" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the thinking.</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="682" style="width: 35px; color: rgba(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="753" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

753

</td>

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

<pre style="margin: 0;">+<span id="LC753" 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="682" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

682

</td>

<td class="diff-line-num new_line" data-linenumber="754" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

754

</td>

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

<pre style="margin: 0;"> <span id="LC754" class="line" lang="haskell"></span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="683" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

683

</td>

<td class="diff-line-num new_line" data-linenumber="755" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

755

</td>

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

<pre style="margin: 0;"> <span id="LC755" class="line" lang="haskell"></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="684" 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">

684

</td>

<td class="diff-line-num new_line old" data-linenumber="756" 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="LC684" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">***</span>*********************************************************************</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="685" style="width: 35px; color: rgba(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="756" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

756

</td>

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

<pre style="margin: 0;">+<span id="LC756" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">{- </span>*********************************************************************</span></span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="685" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

685

</td>

<td class="diff-line-num new_line" data-linenumber="757" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

757

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

<pre style="margin: 0;"> <span id="LC757" 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="686" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

686

</td>

<td class="diff-line-num new_line" data-linenumber="758" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

758

</td>

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

<pre style="margin: 0;"> <span id="LC758" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        MetaTvs (meta type variables; mutable)</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="687" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

687

</td>

<td class="diff-line-num new_line" data-linenumber="759" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

759

</td>

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

<pre style="margin: 0;"> <span id="LC759" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">*                                                                      *</span></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="688" 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">

688

</td>

<td class="diff-line-num new_line old" data-linenumber="760" 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="LC688" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="689" 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">

689

</td>

<td class="diff-line-num new_line old" data-linenumber="760" 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="LC689" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="690" style="width: 35px; color: rgba(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="760" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

760

</td>

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

<pre style="margin: 0;">+<span id="LC760" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">********************************************************************* -}</span></span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="690" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

690

</td>

<td class="diff-line-num new_line" data-linenumber="761" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

761

</td>

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

<pre style="margin: 0;"> <span id="LC761" class="line" lang="haskell"></span>

</pre>

</td>

</tr>

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

<td class="diff-line-num old old_line" data-linenumber="691" 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">

691

</td>

<td class="diff-line-num new_line old" data-linenumber="762" 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="LC691" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>

</pre>

</td>

</tr>

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

<td class="diff-line-num old old_line" data-linenumber="692" 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">

692

</td>

<td class="diff-line-num new_line old" data-linenumber="762" 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="LC692" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [TyVarTv]</span></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="693" 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">

693

</td>

<td class="diff-line-num new_line old" data-linenumber="762" 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="LC693" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~</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="694" style="width: 35px; color: rgba(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="762" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

762

</td>

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

<pre style="margin: 0;">+<span id="LC762" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [TyVarTv]</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="694" style="width: 35px; color: rgba(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="763" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

763

</td>

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

<pre style="margin: 0;">+<span id="LC763" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~</span></span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="694" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

694

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<td class="diff-line-num new_line" data-linenumber="764" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

764

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<pre style="margin: 0;"> <span id="LC764" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="695" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

695

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<td class="diff-line-num new_line" data-linenumber="765" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

765

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<pre style="margin: 0;"> <span id="LC765" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">A TyVarTv can unify with type *variables* only, including other TyVarTvs and</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="696" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

696

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<td class="diff-line-num new_line" data-linenumber="766" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

766

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<pre style="margin: 0;"> <span id="LC766" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">skolems. Sometimes, they can unify with type variables that the user would</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1031" style="width: 35px; color: rgba(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="1101" style="width: 35px; color: rgba(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">@@ -1031,18 +1101,11 @@ newMetaTyVarsX subst = mapAccumLM newMetaTyVarX subst</td>

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<td class="diff-line-num old_line" data-linenumber="1031" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1031

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<td class="diff-line-num new_line" data-linenumber="1101" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1101

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<pre style="margin: 0;"> <span id="LC1101" class="line" lang="haskell"><span class="n" style="color: #333;">newMetaTyVarX</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyVar</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;">TCvSubst</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1032" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1032

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<td class="diff-line-num new_line" data-linenumber="1102" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1102

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<pre style="margin: 0;"> <span id="LC1102" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Make a new unification variable tyvar whose Name and Kind come from</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1033" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1033

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<td class="diff-line-num new_line" data-linenumber="1103" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1103

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<pre style="margin: 0;"> <span id="LC1103" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- an existing TyVar. We substitute kind variables in the kind.</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1034" 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">

1034

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<td class="diff-line-num new_line old" data-linenumber="1104" 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="LC1034" class="line" lang="haskell"><span class="n" style="color: #333;">newMetaTyVarX</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tyvar</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">new_meta_tv_x</span> <span class="kt" style="color: #458; font-weight: 600;">TauTv</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tyvar</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1035" 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">

1035

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<td class="diff-line-num new_line old" data-linenumber="1104" 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="LC1035" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1036" 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">

1036

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<td class="diff-line-num new_line old" data-linenumber="1104" 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="LC1036" class="line" lang="haskell"><span class="n" style="color: #333;">newMetaTyVarTyVars</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">VarBndr</span> <span class="kt" style="color: #458; font-weight: 600;">TyVar</span> <span class="kt" style="color: #458; font-weight: 600;">Specificity</span><span class="p">]</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1037" 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">

1037

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<td class="diff-line-num new_line old" data-linenumber="1104" 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="LC1037" 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;">TCvSubst</span><span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">VarBndr</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span> <span class="kt" style="color: #458; font-weight: 600;">Specificity</span><span class="p">])</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1038" 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">

1038

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<td class="diff-line-num new_line old" data-linenumber="1104" 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="LC1038" class="line" lang="haskell"><span class="n" style="color: #333;">newMetaTyVarTyVars</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapAccumLM</span> <span class="n" style="color: #333;">newMetaTyVarTyVarX</span> <span class="n" style="color: #333;">emptyTCvSubst</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1039" style="width: 35px; color: rgba(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="1104" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1104

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<pre style="margin: 0;">+<span id="LC1104" class="line" lang="haskell"><span class="n" style="color: #333;">newMetaTyVarX</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">new_meta_tv_x</span> <span class="kt" style="color: #458; font-weight: 600;">TauTv</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1039" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1039

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<td class="diff-line-num new_line" data-linenumber="1105" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1105

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<pre style="margin: 0;"> <span id="LC1105" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1040" 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">

1040

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<td class="diff-line-num new_line old" data-linenumber="1106" 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="LC1040" class="line" lang="haskell"><span class="n" style="color: #333;">newMetaTyVarTyVarX</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">VarBndr</span> <span class="kt" style="color: #458; font-weight: 600;">TyVar</span> <span class="kt" style="color: #458; font-weight: 600;">Specificity</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1041" 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">

1041

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<td class="diff-line-num new_line old" data-linenumber="1106" 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="LC1041" 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;">TCvSubst</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">VarBndr</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span> <span class="kt" style="color: #458; font-weight: 600;">Specificity</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1042" style="width: 35px; color: rgba(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="1106" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1106

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<pre style="margin: 0;">+<span id="LC1106" class="line" lang="haskell"><span class="n" style="color: #333;">newMetaTyVarTyVarX</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyVar</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;">TCvSubst</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1042" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1042

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<td class="diff-line-num new_line" data-linenumber="1107" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1107

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<pre style="margin: 0;"> <span id="LC1107" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Just like newMetaTyVarX, but make a TyVarTv</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1043" 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">

1043

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<td class="diff-line-num new_line old" data-linenumber="1108" 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="LC1043" class="line" lang="haskell"><span class="n" style="color: #333;">newMetaTyVarTyVarX</span> <span class="n" style="color: #333;">subst</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Bndr</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">spec</span><span class="p">)</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="1044" 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">

1044

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<td class="diff-line-num new_line old" data-linenumber="1108" 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="LC1044" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">subst'</span><span class="p">,</span> <span class="n" style="color: #333;">tv'</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">new_meta_tv_x</span> <span class="kt" style="color: #458; font-weight: 600;">TyVarTv</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tv</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1045" 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">

1045

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<td class="diff-line-num new_line old" data-linenumber="1108" 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="LC1045" 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;">subst'</span><span class="p">,</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Bndr</span> <span class="n" style="color: #333;">tv'</span> <span class="n" style="color: #333;">spec</span><span class="p">))</span> <span class="p">}</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1046" style="width: 35px; color: rgba(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="1108" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1108

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<pre style="margin: 0;">+<span id="LC1108" class="line" lang="haskell"><span class="n" style="color: #333;">newMetaTyVarTyVarX</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">new_meta_tv_x</span> <span class="kt" style="color: #458; font-weight: 600;">TyVarTv</span></span>

</pre>

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1046

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<td class="diff-line-num new_line" data-linenumber="1109" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1109

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<pre style="margin: 0;"> <span id="LC1109" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1047" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1047

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<td class="diff-line-num new_line" data-linenumber="1110" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1110

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<pre style="margin: 0;"> <span id="LC1110" class="line" lang="haskell"><span class="n" style="color: #333;">newWildCardX</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyVar</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;">TCvSubst</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">)</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1048" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1048

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<td class="diff-line-num new_line" data-linenumber="1111" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1111

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<pre style="margin: 0;"> <span id="LC1111" class="line" lang="haskell"><span class="n" style="color: #333;">newWildCardX</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tv</span></span>

</pre>

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<br>

</li>

<li id="5461e7beeb7ae73d7c01f720cbaa3fa2c5333590">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/835b5d0ef18db26e93e355e55928059c86f8a688#5461e7beeb7ae73d7c01f720cbaa3fa2c5333590"><strong>compiler/GHC/Tc/Utils/TcType.hs</strong></a>

<hr>

<table class="code white" style="font-family: monospace; font-size: 90%;" bgcolor="#fff" width="100%" cellpadding="0" cellspacing="0">

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="57" style="width: 35px; color: rgba(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="57" style="width: 35px; color: rgba(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">@@ -57,7 +57,7 @@ module GHC.Tc.Utils.TcType (</td>

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<td class="diff-line-num old_line" data-linenumber="57" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

57

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57

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<pre style="margin: 0;"> <span id="LC57" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- These are important because they do not look through newtypes</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="58" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

58

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<td class="diff-line-num new_line" data-linenumber="58" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

58

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<pre style="margin: 0;"> <span id="LC58" class="line" lang="haskell">  <span class="nf" style="color: #900; font-weight: 600;">getTyVar</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="59" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

59

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<td class="diff-line-num new_line" data-linenumber="59" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

59

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<pre style="margin: 0;"> <span id="LC59" class="line" lang="haskell">  <span class="nf" style="color: #900; font-weight: 600;">tcSplitForAllTy_maybe</span><span class="p">,</span></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">

60

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<td class="diff-line-num new_line old" 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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<pre style="margin: 0;">-<span id="LC60" class="line" lang="haskell">  <span class="nf" style="color: #900; font-weight: 600;">tcSplitForAllTys</span><span class="p">,</span><span class="idiff left"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">tcSplitSomeForAllTys</span></span><span class="p"><span class="idiff right">,</span></span></span>

</pre>

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

</td>

<td class="diff-line-num new new_line" data-linenumber="60" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

60

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

</pre>

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<td class="diff-line-num old_line" data-linenumber="61" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

61

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<td class="diff-line-num new_line" data-linenumber="61" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

61

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<pre style="margin: 0;"> <span id="LC61" class="line" lang="haskell">  <span class="nf" style="color: #900; font-weight: 600;">tcSplitForAllTysReq</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcSplitForAllTysInvis</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="62" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

62

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<td class="diff-line-num new_line" data-linenumber="62" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

62

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<pre style="margin: 0;"> <span id="LC62" class="line" lang="haskell">  <span class="nf" style="color: #900; font-weight: 600;">tcSplitPiTys</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcSplitPiTy_maybe</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcSplitForAllVarBndrs</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="63" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

63

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<td class="diff-line-num new_line" data-linenumber="63" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

63

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<pre style="margin: 0;"> <span id="LC63" class="line" lang="haskell">  <span class="nf" style="color: #900; font-weight: 600;">tcSplitPhiTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcSplitPredFunTy_maybe</span><span class="p">,</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1221" style="width: 35px; color: rgba(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="LC1221" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">all</span> <span class="n" style="color: #333;">isTyVar</span> <span class="p">(</span><span class="n" style="color: #333;">fst</span> <span class="n" style="color: #333;">sty</span><span class="p">)</span> <span class="p">)</span> <span class="n" style="color: #333;">sty</span></span>

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<pre style="margin: 0;"> <span id="LC1222" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">sty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitForAllTys</span> <span class="n" style="color: #333;">ty</span></span>

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<pre style="margin: 0;"> <span id="LC1223" class="line" lang="haskell"></span>

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<pre style="margin: 0;">-<span id="LC1224" class="line" lang="haskell"><span class="cd">-- | Like 'tcSplitForAllTys', but only splits a 'ForAllTy' if @argf_pred argf@</span></span>

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<pre style="margin: 0;">-<span id="LC1225" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- is 'True', where @argf@ is the visibility of the @ForAllTy@'s binder and</span></span>

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<pre style="margin: 0;">-<span id="LC1226" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @argf_pred@ is a predicate over visibilities provided as an argument to this</span></span>

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<pre style="margin: 0;">-<span id="LC1227" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- function. All split tyvars are annotated with their @argf@.</span></span>

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<pre style="margin: 0;">-<span id="LC1228" class="line" lang="haskell"><span class="n" style="color: #333;">tcSplitSomeForAllTys</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ArgFlag</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">TyCoVarBinder</span><span class="p">],</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="LC1229" class="line" lang="haskell"><span class="n" style="color: #333;">tcSplitSomeForAllTys</span> <span class="n" style="color: #333;">argf_pred</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span><span class="p">(</span> <span class="n" style="color: #333;">all</span> <span class="p">(</span><span class="n" style="color: #333;">isTyVar</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">binderVar</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">fst</span> <span class="n" style="color: #333;">sty</span><span class="p">)</span> <span class="p">)</span> <span class="n" style="color: #333;">sty</span></span>

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<pre style="margin: 0;">-<span id="LC1230" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">sty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitSomeForAllTys</span> <span class="n" style="color: #333;">argf_pred</span> <span class="n" style="color: #333;">ty</span></span>

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<pre style="margin: 0;">-<span id="LC1231" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC1224" class="line" lang="haskell"><span class="cd">-- | Like 'tcSplitForAllTys', but only splits 'ForAllTy's with 'Required' type</span></span>

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<pre style="margin: 0;"> <span id="LC1225" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- variable binders. All split tyvars are annotated with '()'.</span></span>

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<pre style="margin: 0;"> <span id="LC1226" class="line" lang="haskell"><span class="n" style="color: #333;">tcSplitForAllTysReq</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">([</span><span class="kt" style="color: #458; font-weight: 600;">TcReqTVBinder</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span></span>

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</li>

<li id="74295edeac870ee7f2f3484ebaffab5c948b735a">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/835b5d0ef18db26e93e355e55928059c86f8a688#74295edeac870ee7f2f3484ebaffab5c948b735a"><strong>compiler/GHC/Tc/Utils/Unify.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">@@ -61,7 +61,6 @@ import GHC.Types.Name( isSystemName )</td>

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<pre style="margin: 0;"> <span id="LC61" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Instantiate</span></span>

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<pre style="margin: 0;"> <span id="LC62" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCon</span></span>

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<pre style="margin: 0;"> <span id="LC63" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Builtin.Types</span></span>

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<pre style="margin: 0;">-<span id="LC64" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Builtin.Types.Prim</span><span class="p">(</span> <span class="n" style="color: #333;">tYPE</span> <span class="p">)</span></span>

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<pre style="margin: 0;"> <span id="LC64" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">Var</span></span>

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<pre style="margin: 0;"> <span id="LC65" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var.Set</span></span>

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<pre style="margin: 0;"> <span id="LC66" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var.Env</span></span>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="571" style="width: 35px; color: rgba(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">@@ -571,10 +570,51 @@ tcSubTypeNC :: CtOrigin       -- Used when instantiating</td>

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<pre style="margin: 0;"> <span id="LC570" 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="kt" style="color: #458; font-weight: 600;">HsWrapper</span></span>

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<pre style="margin: 0;"> <span id="LC571" class="line" lang="haskell"><span class="n" style="color: #333;">tcSubTypeNC</span> <span class="n" style="color: #333;">inst_orig</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">m_thing</span> <span class="n" style="color: #333;">ty_actual</span> <span class="n" style="color: #333;">res_ty</span></span>

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<pre style="margin: 0;"> <span id="LC572" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">res_ty</span> <span class="kr" style="font-weight: 600;">of</span></span>

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<pre style="margin: 0;">-<span id="LC574" class="line" lang="haskell">      <span class="kt" style="color: #458; font-weight: 600;">Infer</span> <span class="n" style="color: #333;">inf_res</span>     <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">instantiateAndFillInferResult</span> <span class="n" style="color: #333;">inst_orig</span> <span class="n" style="color: #333;">ty_actual</span> <span class="n" style="color: #333;">inf_res</span></span>

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<pre style="margin: 0;"> <span id="LC573" class="line" lang="haskell">      <span class="kt" style="color: #458; font-weight: 600;">Check</span> <span class="n" style="color: #333;">ty_expected</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">tc_sub_type</span> <span class="p">(</span><span class="n" style="color: #333;">unifyType</span> <span class="n" style="color: #333;">m_thing</span><span class="p">)</span> <span class="n" style="color: #333;">inst_orig</span> <span class="n" style="color: #333;">ctxt</span></span>

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<pre style="margin: 0;"> <span id="LC574" class="line" lang="haskell">                                       <span class="n" style="color: #333;">ty_actual</span> <span class="n" style="color: #333;">ty_expected</span></span>

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<pre style="margin: 0;"> <span id="LC575" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC576" class="line" lang="haskell">      <span class="kt" style="color: #458; font-weight: 600;">Infer</span> <span class="n" style="color: #333;">inf_res</span> <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;">wrap</span><span class="p">,</span> <span class="n" style="color: #333;">rho</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">topInstantiate</span> <span class="n" style="color: #333;">inst_orig</span> <span class="n" style="color: #333;">ty_actual</span></span>

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<pre style="margin: 0;">+<span id="LC577" class="line" lang="haskell">                                   <span class="c1" style="color: #998; font-style: italic;">-- See Note [Instantiation of InferResult]</span></span>

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<pre style="margin: 0;">+<span id="LC578" 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;">fillInferResult</span> <span class="n" style="color: #333;">rho</span> <span class="n" style="color: #333;">inf_res</span></span>

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<pre style="margin: 0;">+<span id="LC579" 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>

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580

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<pre style="margin: 0;">+<span id="LC580" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="581" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

581

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<pre style="margin: 0;">+<span id="LC581" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Instantiation of InferResult]</span></span>

</pre>

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582

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<pre style="margin: 0;">+<span id="LC582" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="583" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

583

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<pre style="margin: 0;">+<span id="LC583" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We now always instantiate before filling in InferResult, so that</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="584" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

584

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<pre style="margin: 0;">+<span id="LC584" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the result is a TcRhoType: see #17173 for discussion.</span></span>

</pre>

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585

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<pre style="margin: 0;">+<span id="LC585" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="586" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

586

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<pre style="margin: 0;">+<span id="LC586" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For example:</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="587" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

587

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<pre style="margin: 0;">+<span id="LC587" class="line" lang="haskell"></span>

</pre>

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588

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<pre style="margin: 0;">+<span id="LC588" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">1. Consider</span></span>

</pre>

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589

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<pre style="margin: 0;">+<span id="LC589" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">    f x = (*)</span></span>

</pre>

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590

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<pre style="margin: 0;">+<span id="LC590" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   We want to instantiate the type of (*) before returning, else we</span></span>

</pre>

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591

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<pre style="margin: 0;">+<span id="LC591" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   will infer the type</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="592" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

592

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<pre style="margin: 0;">+<span id="LC592" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">     f :: forall {a}. a -> forall b. Num b => b -> b -> b</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="593" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

593

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<pre style="margin: 0;">+<span id="LC593" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   This is surely confusing for users.</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="594" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

594

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<pre style="margin: 0;">+<span id="LC594" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="595" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

595

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<pre style="margin: 0;">+<span id="LC595" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   And worse, the monomorphism restriction won't work properly. The MR is</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="596" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

596

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<pre style="margin: 0;">+<span id="LC596" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   dealt with in simplifyInfer, and simplifyInfer has no way of</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="597" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

597

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<pre style="margin: 0;">+<span id="LC597" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   instantiating. This could perhaps be worked around, but it may be</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="598" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

598

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<pre style="margin: 0;">+<span id="LC598" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   hard to know even when instantiation should happen.</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="599" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

599

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<pre style="margin: 0;">+<span id="LC599" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC600" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">2. Another reason.  Consider</span></span>

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<pre style="margin: 0;">+<span id="LC601" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">       f :: (?x :: Int) => a -> a</span></span>

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<pre style="margin: 0;">+<span id="LC602" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">       g y = let ?x = 3::Int in f</span></span>

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<pre style="margin: 0;">+<span id="LC603" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   Here want to instantiate f's type so that the ?x::Int constraint</span></span>

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<pre style="margin: 0;">+<span id="LC604" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   gets discharged by the enclosing implicit-parameter binding.</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC605" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC606" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">3. Suppose one defines plus = (+). If we instantiate lazily, we will</span></span>

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<pre style="margin: 0;">+<span id="LC607" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   infer plus :: forall a. Num a => a -> a -> a. However, the monomorphism</span></span>

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<pre style="margin: 0;">+<span id="LC608" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   restriction compels us to infer</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC609" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">      plus :: Integer -> Integer -> Integer</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC610" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   (or similar monotype). Indeed, the only way to know whether to apply</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC611" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   the monomorphism restriction at all is to instantiate</span></span>

</pre>

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612

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<pre style="margin: 0;">+<span id="LC612" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC613" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">There is one place where we don't want to instantiate eagerly,</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC614" 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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<pre style="margin: 0;">+<span id="LC615" 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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616

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<pre style="margin: 0;">+<span id="LC616" 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="LC617" class="line" lang="haskell"></span>

</pre>

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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;">---------------</span></span>

</pre>

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579

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619

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<pre style="margin: 0;"> <span id="LC619" class="line" lang="haskell"><span class="n" style="color: #333;">tcSubTypeSigma</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">UserTypeCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</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;">HsWrapper</span></span>

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<pre style="margin: 0;"> <span id="LC620" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- External entry point, but no ExpTypes on either side</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">@@ -768,213 +808,6 @@ tcEqMult origin w_actual w_expected = do</td>

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<pre style="margin: 0;"> <span id="LC808" class="line" lang="haskell">  <span class="p">;</span> <span class="n" style="color: #333;">coercion</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">uType</span> <span class="kt" style="color: #458; font-weight: 600;">TypeLevel</span> <span class="n" style="color: #333;">origin</span> <span class="n" style="color: #333;">w_actual</span> <span class="n" style="color: #333;">w_expected</span></span>

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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="o" style="font-weight: 600;">$</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">isReflCo</span> <span class="n" style="color: #333;">coercion</span> <span class="kr" style="font-weight: 600;">then</span> <span class="kt" style="color: #458; font-weight: 600;">WpHole</span> <span class="kr" style="font-weight: 600;">else</span> <span class="kt" style="color: #458; font-weight: 600;">WpMultCoercion</span> <span class="n" style="color: #333;">coercion</span> <span class="p">}</span></span>

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<pre style="margin: 0;"> <span id="LC810" class="line" lang="haskell"></span>

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<pre style="margin: 0;">-<span id="LC771" 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="LC772" 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="LC773" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">            ExpType functions: tcInfer, instantiateAndFillInferResult</span></span>

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<pre style="margin: 0;">-<span id="LC774" 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="LC775" 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="LC776" class="line" lang="haskell"></span>

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<pre style="margin: 0;">-<span id="LC777" class="line" lang="haskell"><span class="cd">-- | Infer a type using a fresh ExpType</span></span>

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<pre style="margin: 0;">-<span id="LC778" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See also Note [ExpType] in "GHC.Tc.Utils.TcMType"</span></span>

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<pre style="margin: 0;">-<span id="LC779" class="line" lang="haskell"><span class="n" style="color: #333;">tcInfer</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="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="n" style="color: #333;">a</span><span class="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="n" style="color: #333;">a</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span><span class="p">)</span></span>

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<pre style="margin: 0;">-<span id="LC780" class="line" lang="haskell"><span class="n" style="color: #333;">tcInfer</span> <span class="n" style="color: #333;">tc_check</span></span>

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<pre style="margin: 0;">-<span id="LC781" 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;">newInferExpType</span></span>

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<pre style="margin: 0;">-<span id="LC782" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">result</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tc_check</span> <span class="n" style="color: #333;">res_ty</span></span>

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<pre style="margin: 0;">-<span id="LC783" 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>

</pre>

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784

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<pre style="margin: 0;">-<span id="LC784" 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;">result</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span> <span class="p">}</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="785" 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">

785

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<pre style="margin: 0;">-<span id="LC785" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="786" 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">

786

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

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<pre style="margin: 0;">-<span id="LC786" class="line" lang="haskell"><span class="n" style="color: #333;">instantiateAndFillInferResult</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CtOrigin</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">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;">HsWrapper</span></span>

</pre>

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

787

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<pre style="margin: 0;">-<span id="LC787" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If wrap = instantiateAndFillInferResult t1 t2</span></span>

</pre>

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

788

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<pre style="margin: 0;">-<span id="LC788" 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="789" 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">

789

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<pre style="margin: 0;">-<span id="LC789" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Instantiation of InferResult]</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="790" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

790

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<pre style="margin: 0;">-<span id="LC790" class="line" lang="haskell"><span class="n" style="color: #333;">instantiateAndFillInferResult</span> <span class="n" style="color: #333;">orig</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">inf_res</span></span>

</pre>

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

791

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<pre style="margin: 0;">-<span id="LC791" 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;">wrap</span><span class="p">,</span> <span class="n" style="color: #333;">rho</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">topInstantiate</span> <span class="n" style="color: #333;">orig</span> <span class="n" style="color: #333;">ty</span></span>

</pre>

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792

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<pre style="margin: 0;">-<span id="LC792" 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;">fillInferResult</span> <span class="n" style="color: #333;">rho</span> <span class="n" style="color: #333;">inf_res</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="793" 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="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 old_line" data-linenumber="794" 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">

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 old_line" data-linenumber="795" 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">

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

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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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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;">--    => 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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<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

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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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800

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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="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">

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

</pre>

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

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

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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="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">

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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="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">

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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

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

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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

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

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

</pre>

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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="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">

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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

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

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<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

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

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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>

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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

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

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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>

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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="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">

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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>

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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="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">

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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>

</td>

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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="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">

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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>

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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

</td>

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

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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>

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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="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">

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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

</td>

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

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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>

</td>

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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="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">

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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>

</td>

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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

</td>

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

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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>

</td>

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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

</td>

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

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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>

</td>

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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

</td>

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

</td>

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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>

</td>

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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

</td>

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

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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>

</td>

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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

</td>

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

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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>

</td>

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

823

</td>

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

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<pre style="margin: 0;">-<span id="LC823" class="line" lang="haskell"></span>

</pre>

</td>

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

824

</td>

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

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<pre style="margin: 0;">-<span id="LC824" 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 old_line" data-linenumber="825" 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">

825

</td>

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

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<pre style="margin: 0;">-<span id="LC825" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="826" 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">

826

</td>

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

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<pre style="margin: 0;">-<span id="LC826" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We now always instantiate before filling in InferResult, so that</span></span>

</pre>

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

827

</td>

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

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<pre style="margin: 0;">-<span id="LC827" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the result is a TcRhoType: see #17173 for discussion.</span></span>

</pre>

</td>

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

828

</td>

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

</td>

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<pre style="margin: 0;">-<span id="LC828" class="line" lang="haskell"></span>

</pre>

</td>

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

829

</td>

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

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<pre style="margin: 0;">-<span id="LC829" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For example:</span></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="830" 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">

830

</td>

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

</td>

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

<pre style="margin: 0;">-<span id="LC830" class="line" lang="haskell"></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="831" 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">

831

</td>

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

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<pre style="margin: 0;">-<span id="LC831" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">1. Consider</span></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="832" 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">

832

</td>

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

</td>

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<pre style="margin: 0;">-<span id="LC832" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">    f x = (*)</span></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="833" 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">

833

</td>

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

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<pre style="margin: 0;">-<span id="LC833" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   We want to instantiate the type of (*) before returning, else we</span></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="834" 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">

834

</td>

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

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<pre style="margin: 0;">-<span id="LC834" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   will infer the type</span></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="835" 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">

835

</td>

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

</td>

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<pre style="margin: 0;">-<span id="LC835" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">     f :: forall {a}. a -> forall b. Num b => b -> b -> b</span></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="836" 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">

836

</td>

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

</td>

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<pre style="margin: 0;">-<span id="LC836" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   This is surely confusing for users.</span></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="837" 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">

837

</td>

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

</td>

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

</pre>

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<pre style="margin: 0;">-<span id="LC838" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   And worse, the monomorphism restriction won't work properly. The MR is</span></span>

</pre>

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839

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<pre style="margin: 0;">-<span id="LC839" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   dealt with in simplifyInfer, and simplifyInfer has no way of</span></span>

</pre>

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840

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<pre style="margin: 0;">-<span id="LC840" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   instantiating. This could perhaps be worked around, but it may be</span></span>

</pre>

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841

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<pre style="margin: 0;">-<span id="LC841" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   hard to know even when instantiation should happen.</span></span>

</pre>

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842

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<pre style="margin: 0;">-<span id="LC842" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="843" 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">

843

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<pre style="margin: 0;">-<span id="LC843" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">2. Another reason.  Consider</span></span>

</pre>

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844

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<pre style="margin: 0;">-<span id="LC844" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">       f :: (?x :: Int) => a -> a</span></span>

</pre>

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845

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<pre style="margin: 0;">-<span id="LC845" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">       g y = let ?x = 3::Int in f</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC846" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   Here want to instantiate f's type so that the ?x::Int constraint</span></span>

</pre>

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847

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<pre style="margin: 0;">-<span id="LC847" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   gets discharged by the enclosing implicit-parameter binding.</span></span>

</pre>

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848

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<pre style="margin: 0;">-<span id="LC848" class="line" lang="haskell"></span>

</pre>

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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;">3. Suppose one defines plus = (+). If we instantiate lazily, we will</span></span>

</pre>

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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;">   infer plus :: forall a. Num a => a -> a -> a. However, the monomorphism</span></span>

</pre>

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851

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<pre style="margin: 0;">-<span id="LC851" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   restriction compels us to infer</span></span>

</pre>

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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;">      plus :: Integer -> Integer -> Integer</span></span>

</pre>

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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;">   (or similar monotype). Indeed, the only way to know whether to apply</span></span>

</pre>

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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;">   the monomorphism restriction at all is to instantiate</span></span>

</pre>

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855

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<pre style="margin: 0;">-<span id="LC855" class="line" lang="haskell"></span>

</pre>

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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;">There is one place where we don't want to instantiate eagerly,</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;">namely in GHC.Tc.Module.tcRnExpr, which implements GHCi's :type</span></span>

</pre>

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858

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<pre style="margin: 0;">-<span id="LC858" 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 old_line" data-linenumber="859" 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">

859

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

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<pre style="margin: 0;">-<span id="LC859" class="line" lang="haskell"></span>

</pre>

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

860

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<pre style="margin: 0;">-<span id="LC860" 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="861" 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">

861

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

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<pre style="margin: 0;">-<span id="LC861" class="line" lang="haskell"></span>

</pre>

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

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;">{- *********************************************************************</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="863" 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">

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;">*                                                                      *</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="864" 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">

864

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<pre style="margin: 0;">-<span id="LC864" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">              Promoting types</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="865" 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">

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;">*                                                                      *</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="866" 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">

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;">********************************************************************* -}</span></span>

</pre>

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

867

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<pre style="margin: 0;">-<span id="LC867" class="line" lang="haskell"></span>

</pre>

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

868

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<pre style="margin: 0;">-<span id="LC868" 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>

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

869

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<pre style="margin: 0;">-<span id="LC869" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Promoting a type]</span></span>

</pre>

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

870

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<pre style="margin: 0;">-<span id="LC870" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- promoteTcType level ty = (co, ty')</span></span>

</pre>

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

871

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<pre style="margin: 0;">-<span id="LC871" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--   * Returns ty'  whose max level is just 'level'</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="872" 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">

872

</td>

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

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<pre style="margin: 0;">-<span id="LC872" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--             and  whose kind is ~# to the kind of 'ty'</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="873" 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">

873

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

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<pre style="margin: 0;">-<span id="LC873" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--             and  whose kind has form TYPE rr</span></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="874" 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">

874

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<pre style="margin: 0;">-<span id="LC874" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--   * and co :: ty ~ ty'</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="875" 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">

875

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<pre style="margin: 0;">-<span id="LC875" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--   * and emits constraints to justify the coercion</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="876" 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">

876

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<pre style="margin: 0;">-<span id="LC876" class="line" lang="haskell"><span class="n" style="color: #333;">promoteTcType</span> <span class="n" style="color: #333;">dest_lvl</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="877" 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">

877

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<pre style="margin: 0;">-<span id="LC877" 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>

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<td class="diff-line-num old old_line" data-linenumber="878" 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">

878

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

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<pre style="margin: 0;">-<span id="LC878" class="line" lang="haskell">       <span class="p">;</span> <span class="kr" style="font-weight: 600;">if</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>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="879" 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">

879

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

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<pre style="margin: 0;">-<span id="LC879" class="line" lang="haskell">         <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">dont_promote_it</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="880" 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">

880

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

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<pre style="margin: 0;">-<span id="LC880" class="line" lang="haskell">         <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">promote_it</span> <span class="p">}</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="881" 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">

881

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

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<pre style="margin: 0;">-<span id="LC881" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="882" 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">

882

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<pre style="margin: 0;">-<span id="LC882" class="line" lang="haskell">    <span class="n" style="color: #333;">promote_it</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>

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<td class="diff-line-num old old_line" data-linenumber="883" 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">

883

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<pre style="margin: 0;">-<span id="LC883" class="line" lang="haskell">    <span class="n" style="color: #333;">promote_it</span>  <span class="c1" style="color: #998; font-style: italic;">-- Emit a constraint  (alpha :: TYPE rr) ~ ty</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="884" 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">

884

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

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<pre style="margin: 0;">-<span id="LC884" class="line" lang="haskell">                <span class="c1" style="color: #998; font-style: italic;">-- where alpha and rr are fresh and from level dest_lvl</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="885" 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">

885

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<pre style="margin: 0;">-<span id="LC885" 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;">dest_lvl</span> <span class="n" style="color: #333;">runtimeRepTy</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="886" 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">

886

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<pre style="margin: 0;">-<span id="LC886" class="line" lang="haskell">           <span class="p">;</span> <span class="n" style="color: #333;">prom_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newMetaTyVarTyAtLevel</span> <span class="n" style="color: #333;">dest_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 old_line" data-linenumber="887" 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">

887

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<pre style="margin: 0;">-<span id="LC887" 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;">ty</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="888" 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">

888

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

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<pre style="margin: 0;">-<span id="LC888" 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;">prom_ty</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="889" 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">

889

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

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<pre style="margin: 0;">-<span id="LC889" 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>

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<td class="diff-line-num old old_line" data-linenumber="890" 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">

890

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

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<pre style="margin: 0;">-<span id="LC890" 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>

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<td class="diff-line-num old old_line" data-linenumber="891" 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">

891

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

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<pre style="margin: 0;">-<span id="LC891" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="892" 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">

892

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<pre style="margin: 0;">-<span id="LC892" 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;">ty</span> <span class="n" style="color: #333;">prom_ty</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="893" 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">

893

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<pre style="margin: 0;">-<span id="LC893" class="line" lang="haskell">           <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">co</span><span class="p">,</span> <span class="n" style="color: #333;">prom_ty</span><span class="p">)</span> <span class="p">}</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="894" 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">

894

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

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<pre style="margin: 0;">-<span id="LC894" class="line" lang="haskell"></span>

</pre>

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895

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<pre style="margin: 0;">-<span id="LC895" class="line" lang="haskell">    <span class="n" style="color: #333;">dont_promote_it</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>

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<td class="diff-line-num old old_line" data-linenumber="896" 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">

896

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<pre style="margin: 0;">-<span id="LC896" class="line" lang="haskell">    <span class="n" style="color: #333;">dont_promote_it</span>  <span class="c1" style="color: #998; font-style: italic;">-- Check that ty :: TYPE rr, for some (fresh) rr</span></span>

</pre>

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897

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

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<pre style="margin: 0;">-<span id="LC897" 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_kind</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newOpenTypeKind</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="898" 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">

898

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

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<pre style="margin: 0;">-<span id="LC898" class="line" lang="haskell">           <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ty_kind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcTypeKind</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="899" 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">

899

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<pre style="margin: 0;">-<span id="LC899" class="line" lang="haskell">                 <span class="n" style="color: #333;">kind_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;">ty_kind</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="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;">res_kind</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="901" 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">

901

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<pre style="margin: 0;">-<span id="LC901" 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>

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<td class="diff-line-num old old_line" data-linenumber="902" 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">

902

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<pre style="margin: 0;">-<span id="LC902" 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>

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<td class="diff-line-num old old_line" data-linenumber="903" 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">

903

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<pre style="margin: 0;">-<span id="LC903" class="line" lang="haskell">           <span class="p">;</span> <span class="n" style="color: #333;">ki_co</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">uType</span> <span class="kt" style="color: #458; font-weight: 600;">KindLevel</span> <span class="n" style="color: #333;">kind_orig</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="n" style="color: #333;">res_kind</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="904" 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">

904

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

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<pre style="margin: 0;">-<span id="LC904" class="line" lang="haskell">           <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTcGReflRightCo</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">ki_co</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="905" 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">

905

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<pre style="margin: 0;">-<span id="LC905" class="line" lang="haskell">           <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">co</span><span class="p">,</span> <span class="n" style="color: #333;">ty</span> <span class="p">`</span><span class="n" style="color: #333;">mkCastTy</span><span class="p">`</span> <span class="n" style="color: #333;">ki_co</span><span class="p">)</span> <span class="p">}</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="906" 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">

906

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

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<pre style="margin: 0;">-<span id="LC906" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="907" 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">

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;">{- Note [Promoting a type]</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="908" 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">

908

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

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<pre style="margin: 0;">-<span id="LC908" 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="909" 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">

909

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

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<pre style="margin: 0;">-<span id="LC909" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider (#12427)</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="910" 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">

910

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

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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 old old_line" data-linenumber="911" 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">

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;">  data T where</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="912" 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">

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;">    MkT :: (Int -> Int) -> a -> T</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="913" 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">

913

</td>

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

</td>

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<pre style="margin: 0;">-<span id="LC913" class="line" lang="haskell"></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="914" 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">

914

</td>

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

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<pre style="margin: 0;">-<span id="LC914" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  h y = case y of MkT v w -> v</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="915" 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">

915

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

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<pre style="margin: 0;">-<span id="LC915" class="line" lang="haskell"></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="916" 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">

916

</td>

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

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<pre style="margin: 0;">-<span id="LC916" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We'll infer the RHS type with an expected type ExpType of</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="917" 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">

917

</td>

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

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<pre style="margin: 0;">-<span id="LC917" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  (IR { ir_lvl = l, ir_ref = ref, ... )</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="918" 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">

918

</td>

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

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<pre style="margin: 0;">-<span id="LC918" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">where 'l' is the TcLevel of the RHS of 'h'.  Then the MkT pattern</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="919" 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">

919

</td>

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

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<pre style="margin: 0;">-<span id="LC919" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">match will increase the level, so we'll end up in tcSubType, trying to</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="920" 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">

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;">unify the type of v,</span></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="921" 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">

921

</td>

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

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<pre style="margin: 0;">-<span id="LC921" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  v :: Int -> Int</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="922" 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">

922

</td>

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

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<pre style="margin: 0;">-<span id="LC922" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with the expected type.  But this attempt takes place at level (l+1),</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="923" 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">

923

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

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<pre style="margin: 0;">-<span id="LC923" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">rightly so, since v's type could have mentioned existential variables,</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="924" 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">

924

</td>

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

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<pre style="margin: 0;">-<span id="LC924" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(like w's does) and we want to catch that.</span></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="925" 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">

925

</td>

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

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<pre style="margin: 0;">-<span id="LC925" class="line" lang="haskell"></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="926" 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">

926

</td>

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

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<pre style="margin: 0;">-<span id="LC926" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So we</span></span>

</pre>

</td>

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

927

</td>

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

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<pre style="margin: 0;">-<span id="LC927" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  - create a new meta-var alpha[l+1]</span></span>

</pre>

</td>

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

928

</td>

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

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<pre style="margin: 0;">-<span id="LC928" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  - fill in the InferRes ref cell 'ref' with alpha</span></span>

</pre>

</td>

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

929

</td>

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

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<pre style="margin: 0;">-<span id="LC929" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  - emit an equality constraint, thus</span></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="930" 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">

930

</td>

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<pre style="margin: 0;">-<span id="LC930" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        [W] alpha[l+1] ~ (Int -> Int)</span></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="931" 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">

931

</td>

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

</td>

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<pre style="margin: 0;">-<span id="LC931" class="line" lang="haskell"></span>

</pre>

</td>

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<td class="diff-line-num old old_line" data-linenumber="932" 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">

932

</td>

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<pre style="margin: 0;">-<span id="LC932" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">That constraint will float outwards, as it should, unless v's</span></span>

</pre>

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933

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

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<pre style="margin: 0;">-<span id="LC933" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">type mentions a skolem-captured variable.</span></span>

</pre>

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

934

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

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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 old old_line" data-linenumber="935" 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">

935

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

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<pre style="margin: 0;">-<span id="LC935" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This approach fails if v has a higher rank type; see</span></span>

</pre>

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

936

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

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<pre style="margin: 0;">-<span id="LC936" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Promotion and higher rank types]</span></span>

</pre>

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

937

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

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<pre style="margin: 0;">-<span id="LC937" class="line" lang="haskell"></span>

</pre>

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

938

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

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<pre style="margin: 0;">-<span id="LC938" class="line" lang="haskell"></span>

</pre>

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

939

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

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<pre style="margin: 0;">-<span id="LC939" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Promotion and higher rank types]</span></span>

</pre>

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

940

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

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<pre style="margin: 0;">-<span id="LC940" 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="941" 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">

941

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<pre style="margin: 0;">-<span id="LC941" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If v had a higher-rank type, say v :: (forall a. a->a) -> Int,</span></span>

</pre>

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

942

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

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<pre style="margin: 0;">-<span id="LC942" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">then we'd emit an equality</span></span>

</pre>

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

943

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<pre style="margin: 0;">-<span id="LC943" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        [W] alpha[l+1] ~ ((forall a. a->a) -> Int)</span></span>

</pre>

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

944

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

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<pre style="margin: 0;">-<span id="LC944" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">which will sadly fail because we can't unify a unification variable</span></span>

</pre>

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

945

</td>

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

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<pre style="margin: 0;">-<span id="LC945" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with a polytype.  But there is nothing really wrong with the program</span></span>

</pre>

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

946

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

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<pre style="margin: 0;">-<span id="LC946" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">here.</span></span>

</pre>

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

947

</td>

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

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

</pre>

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

948

</td>

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

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<pre style="margin: 0;">-<span id="LC948" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We could just about solve this by "promote the type" of v, to expose</span></span>

</pre>

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

949

</td>

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

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<pre style="margin: 0;">-<span id="LC949" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">its polymorphic "shape" while still leaving constraints that will</span></span>

</pre>

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

950

</td>

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

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<pre style="margin: 0;">-<span id="LC950" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">prevent existential escape.  But we must be careful!  Exposing</span></span>

</pre>

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

951

</td>

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

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<pre style="margin: 0;">-<span id="LC951" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the "shape" of the type is precisely what we must NOT do under</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="952" 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">

952

</td>

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

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<pre style="margin: 0;">-<span id="LC952" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">a GADT pattern match!  So in this case we might promote the type</span></span>

</pre>

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953

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

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<pre style="margin: 0;">-<span id="LC953" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="954" 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">

954

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<pre style="margin: 0;">-<span id="LC954" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        (forall a. a->a) -> alpha[l+1]</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="955" 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">

955

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

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<pre style="margin: 0;">-<span id="LC955" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and emit the constraint</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="956" 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">

956

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<pre style="margin: 0;">-<span id="LC956" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        [W] alpha[l+1] ~ Int</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="957" 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">

957

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

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<pre style="margin: 0;">-<span id="LC957" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Now the promoted type can fill the ref cell, while the emitted</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="958" 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">

958

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

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<pre style="margin: 0;">-<span id="LC958" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">equality can float or not, according to the usual rules.</span></span>

</pre>

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959

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<pre style="margin: 0;">-<span id="LC959" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="960" 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">

960

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

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<pre style="margin: 0;">-<span id="LC960" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But that's not quite right!  We are exposing the arrow! We could</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="961" 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">

961

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

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<pre style="margin: 0;">-<span id="LC961" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">deal with that too:</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="962" 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">

962

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<pre style="margin: 0;">-<span id="LC962" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        (forall a. mu[l+1] a a) -> alpha[l+1]</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="963" 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">

963

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<pre style="margin: 0;">-<span id="LC963" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with constraints</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="964" 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">

964

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<pre style="margin: 0;">-<span id="LC964" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        [W] alpha[l+1] ~ Int</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="965" 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">

965

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<pre style="margin: 0;">-<span id="LC965" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        [W] mu[l+1] ~ (->)</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="966" 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">

966

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<pre style="margin: 0;">-<span id="LC966" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here we abstract over the '->' inside the forall, in case that</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="967" 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">

967

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<pre style="margin: 0;">-<span id="LC967" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is subject to an equality constraint from a GADT match.</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="968" 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">

968

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<pre style="margin: 0;">-<span id="LC968" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="969" 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">

969

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<pre style="margin: 0;">-<span id="LC969" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that we kept the outer (->) because that's part of</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="970" 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">

970

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<pre style="margin: 0;">-<span id="LC970" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the polymorphic "shape".  And because of impredicativity,</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="971" 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">

971

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<pre style="margin: 0;">-<span id="LC971" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GADT matches can't give equalities that affect polymorphic</span></span>

</pre>

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972

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<pre style="margin: 0;">-<span id="LC972" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">shape.</span></span>

</pre>

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973

</td>

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

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<pre style="margin: 0;">-<span id="LC973" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="974" 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">

974

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

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<pre style="margin: 0;">-<span id="LC974" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This reasoning just seems too complicated, so I decided not</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="975" 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">

975

</td>

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

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<pre style="margin: 0;">-<span id="LC975" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to do it.  These higher-rank notes are just here to record</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="976" 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">

976

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

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<pre style="margin: 0;">-<span id="LC976" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the thinking.</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="977" 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">

977

</td>

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<pre style="margin: 0;">-<span id="LC977" 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="978" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

978

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811

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<pre style="margin: 0;"> <span id="LC811" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="979" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

979

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812

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<pre style="margin: 0;"> <span id="LC812" 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="980" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

980

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813

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<pre style="margin: 0;"> <span id="LC813" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">*                                                                      *</span></span>

</pre>

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<br>

</li>

<li id="76b1e7dce1b4954525a28c2fed28ba31ca27a964">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/835b5d0ef18db26e93e355e55928059c86f8a688#76b1e7dce1b4954525a28c2fed28ba31ca27a964"><strong>testsuite/tests/simplCore/should_compile/T17901.stdout</strong></a>

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1

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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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1

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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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2

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2

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

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3

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3

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

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4

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4

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

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5

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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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5

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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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6

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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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7

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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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7

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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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8

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8

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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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9

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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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<br>

</li>

<li id="32573c6529fd33f769071231b058ea20cd2d4b0d">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/835b5d0ef18db26e93e355e55928059c86f8a688#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/835b5d0ef18db26e93e355e55928059c86f8a688#34fe7bf0e6fbf60effb28393399ba68666593909"><strong>testsuite/tests/typecheck/should_compile/all.T</strong></a>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="716" style="width: 35px; color: rgba(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="716" style="width: 35px; color: rgba(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">@@ -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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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>

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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>

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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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<li id="fb81f990ca209fe548e11dc52c6cf80c0bdf31a9">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/835b5d0ef18db26e93e355e55928059c86f8a688#fb81f990ca209fe548e11dc52c6cf80c0bdf31a9"><strong>testsuite/tests/typecheck/should_fail/T10619.stderr</strong></a>

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

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

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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>

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

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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>

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

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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>

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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>

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

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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>

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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>

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

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

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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>

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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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<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="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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<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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<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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<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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<pre style="margin: 0;"> <span id="LC25" class="line" lang="plaintext">      ‘p’ is a rigid type variable bound by</span>

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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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<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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<pre style="margin: 0;"> <span id="LC27" class="line" lang="plaintext">        at T10619.hs:(12,1)-(14,66)</span>

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<pre style="margin: 0;"> <span id="LC28" class="line" lang="plaintext">    • In the expression:</span>

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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="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>

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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>

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<pre style="margin: 0;"> <span id="LC41" class="line" lang="plaintext">    • Relevant bindings include</span>

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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>

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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>

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

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<pre style="margin: 0;">-<span id="LC48" class="line" lang="plaintext">T10619.hs:16:13: error:</span>

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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>

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<pre style="margin: 0;">-<span id="LC50" class="line" lang="plaintext">      Expected: p -> p</span>

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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>

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<pre style="margin: 0;">-<span id="LC52" class="line" lang="plaintext">      ‘p’ is a rigid type variable bound by</span>

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<pre style="margin: 0;">-<span id="LC53" class="line" lang="plaintext">        the inferred type of baz :: Bool -> p -> p</span>

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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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<pre style="margin: 0;">-<span id="LC55" class="line" lang="plaintext">    • In the expression:</span>

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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>

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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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<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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<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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<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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<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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<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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<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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<pre style="margin: 0;">+<span id="LC47" class="line" lang="plaintext">        Actual: p0 -> 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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<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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<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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<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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<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 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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<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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<td class="diff-line-num old_line" data-linenumber="62" style="width: 35px; color: rgba(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="53" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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

</pre>

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<td class="diff-line-num old_line" data-linenumber="63" style="width: 35px; color: rgba(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="54" style="width: 35px; color: rgba(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="LC54" class="line" lang="plaintext">    • Couldn't match type ‘p’ with ‘forall a. a -> a’</span>

</pre>

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<br>

</li>

<li id="d11758f93287e3d88c519d06faf4c1e867e35202">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/835b5d0ef18db26e93e355e55928059c86f8a688#d11758f93287e3d88c519d06faf4c1e867e35202"><strong>testsuite/tests/typecheck/should_fail/tcfail002.stderr</strong></a>

<hr>

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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="plaintext"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="2" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

2

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<td class="diff-line-num new_line" data-linenumber="2" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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

3

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

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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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<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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<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="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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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext">    • In the expression: z</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="plaintext">      In an equation for ‘c’: c z = z</span>

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

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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>

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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>

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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/835b5d0ef18db26e93e355e55928059c86f8a688#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>

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<pre style="margin: 0;">-<span id="LC2" class="line" lang="plaintext">tcfail104.hs:14:12: error:</span>

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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">tcfail104.hs:16:12: error:</span>

</pre>

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

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

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

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

</pre>

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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>

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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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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>

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12

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

</pre>

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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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3

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

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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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<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

</td>

<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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<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

</td>

<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

</td>

<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

</td>

<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">

</td>

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

<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>

</td>

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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

</td>

<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

</td>

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

<pre style="margin: 0;"> <span id="LC21" class="line" lang="plaintext">      In the expression:</span>

</pre>

</td>

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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

</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="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

</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">

</td>

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

<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

</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="LC13" class="line" lang="plaintext">tcfail104.hs:22:15: error:</span>

</pre>

</td>

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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>

</td>

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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>

</td>

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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">

</td>

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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>

</td>

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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>

</td>

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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">

</td>

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

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

</pre>

</td>

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

<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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<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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