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<h3>
Ben Gamari pushed to branch wip/backport-MR951
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/19ab32c5fb3ebd88927b94acf6b348facc1552a2">19ab32c5</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2019-06-12T17:58:36Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #16517 by bumping the TcLevel for method sigs

There were actually two bugs fixed here:

1. candidateQTyVarsOfType needs to be careful that it does not
   try to zap metavariables from an outer scope as "naughty"
   quantification candidates. This commit adds a simple check
   to avoid doing so.

2. We weren't bumping the TcLevel in kcHsKindSig, which was used
   only for class method sigs. This mistake led to the acceptance
   of

     class C a where
       meth :: forall k. Proxy (a :: k) -> ()

   Note that k is *locally* quantified. This patch fixes the
   problem by using tcClassSigType, which correctly bumps the
   level. It's a bit inefficient because tcClassSigType does other
   work, too, but it would be tedious to repeat much of the code
   there with only a few changes. This version works well and is
   simple.

And, while updating comments, etc., I noticed that tcRnType was
missing a pushTcLevel, leading to #16767, which this patch also
fixes, by bumping the level. In the refactoring here, I also
use solveEqualities. This initially failed ghci/scripts/T15415,
but that was fixed by teaching solveEqualities to respect
-XPartialTypeSignatures.

This patch also cleans up some Notes around error generation that
came up in conversation.

Test case: typecheck/should_fail/T16517, ghci/scripts/T16767

(cherry picked from commit a22e51ea6f7a046c87d57ce30d143eef6abee9ff)
</pre>
</li>
</ul>
<h4>16 changed files:</h4>
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<a href="#9f8e9eab0dc8b12ae9f92fbb76ddca15c817667a">
compiler/typecheck/TcCanonical.hs
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<a href="#c573dfc3158e7ec41ecc0965becd5f1e6e92a2e6">
compiler/typecheck/TcErrors.hs
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<a href="#350c4076427c611b8f14e875a4ca553041c2b847">
compiler/typecheck/TcHsType.hs
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<a href="#367db94fc37c8c7548dbe545a5302c7a5108e41e">
compiler/typecheck/TcMType.hs
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<a href="#2799ba786adc98d485fad6003334b913a0069bdc">
compiler/typecheck/TcRnDriver.hs
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<a href="#d2ddf5ce2d076f8584d9825af8ea0d7ea0a38813">
compiler/typecheck/TcRnTypes.hs
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<a href="#75d517f701402b106e4d98d255eb24b57ba72aab">
compiler/typecheck/TcSimplify.hs
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<a href="#bdfa0cc139f61d1236abc1598c5d684b43c357f9">
compiler/typecheck/TcTyClsDecls.hs
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<a href="#341fd962c5f2c9fcf8be3dbdaa9a14ee1538af07">
compiler/typecheck/TcType.hs
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testsuite/tests/ghci/scripts/T16767.script
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testsuite/tests/ghci/scripts/T16767.stdout
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testsuite/tests/ghci/scripts/all.T
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testsuite/tests/typecheck/should_fail/T16517.hs
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testsuite/tests/typecheck/should_fail/all.T
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testsuite/tests/typecheck/should_fail/tcfail134.stderr
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<h4>Changes:</h4>
<li id="9f8e9eab0dc8b12ae9f92fbb76ddca15c817667a">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/19ab32c5fb3ebd88927b94acf6b348facc1552a2#9f8e9eab0dc8b12ae9f92fbb76ddca15c817667a"><strong>compiler/typecheck/TcCanonical.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">@@ -2079,13 +2079,6 @@ What do we do when we have an equality</td>
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<pre style="margin: 0;"> <span id="LC2079" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2080" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">where k1 and k2 differ? This Note explores this treacherous area.</span></span>
</pre>
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<pre style="margin: 0;"> <span id="LC2081" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2082" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">First off, the question above is slightly the wrong question. Flattening</span></span>
</pre>
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<pre style="margin: 0;">-<span id="LC2083" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">a tyvar will flatten its kind (Note [Flattening] in TcFlatten); flattening</span></span>
</pre>
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<pre style="margin: 0;">-<span id="LC2084" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the kind might introduce a cast. So we might have a casted tyvar on the</span></span>
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<pre style="margin: 0;">-<span id="LC2085" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">left. We thus revise our test case to</span></span>
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<pre style="margin: 0;">-<span id="LC2086" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2087" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  (tv |> co :: k1) ~ (rhs :: k2)</span></span>
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<pre style="margin: 0;">-<span id="LC2088" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2082" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We must proceed differently here depending on whether we have a Wanted</span></span>
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<pre style="margin: 0;"> <span id="LC2083" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">or a Given. Consider this:</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2109,36 +2102,33 @@ The reason for this odd behavior is much the same as</td>
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<pre style="margin: 0;"> <span id="LC2102" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Wanteds do not rewrite Wanteds] in TcRnTypes: note that the</span></span>
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2110
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2103
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<pre style="margin: 0;"> <span id="LC2103" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">new `co` is a Wanted.</span></span>
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2111
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2104
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<pre style="margin: 0;"> <span id="LC2104" class="line" lang="haskell"></span>
</pre>
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2112
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<td class="diff-line-num new_line old" data-linenumber="2105" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2112" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">   The solution is then not to use `co` to "rewrite" -- that is, cas</span>t</span></span>
</pre>
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2113
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<td class="diff-line-num new_line old" data-linenumber="2105" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2113" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">   -- `w`, but instead to keep `w` heterogeneous and</span></span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2114" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2114
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<td class="diff-line-num new_line old" data-linenumber="2105" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2114" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">   irreducible. Given that we're not using `co`, there is no reason to</span></span></span>
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<td class="diff-line-num old old_line" data-linenumber="2115" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2115
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<td class="diff-line-num new_line old" data-linenumber="2105" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2115" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">   collect evidence for it, so `co` is born a Derived, with a CtOrigin</span></span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2116" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2116
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<td class="diff-line-num new_line old" data-linenumber="2105" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2116" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">   of KindEqOrigin.</span></span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="2117" style="width: 35px; color: rgba(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="2105" style="width: 35px; color: rgba(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="LC2105" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">The solution is then not to use `co` to "rewrite" -- that is, cast -- `w`, bu</span>t</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="2106" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2106
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<pre style="margin: 0;">+<span id="LC2106" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">instead to keep `w` heterogeneous and irreducible. Given that we're not using</span></span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="2117" style="width: 35px; color: rgba(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="2107" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2107
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<pre style="margin: 0;">+<span id="LC2107" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">`co`, there is no reason to collect evidence for it, so `co` is born a</span></span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="2117" style="width: 35px; color: rgba(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="2108" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2108
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<pre style="margin: 0;">+<span id="LC2108" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">Derived, with a CtOrigin of KindEqOrigin. When the Derived is solved (by</span></span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="2117" style="width: 35px; color: rgba(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="2109" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2109
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<pre style="margin: 0;">+<span id="LC2109" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">unification), the original wanted (`w`) will get kicked out. We thus get</span></span></span>
</pre>
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2117
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2110
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<pre style="margin: 0;"> <span id="LC2110" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2118" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2118
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<td class="diff-line-num new_line old" data-linenumber="2111" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2118" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">When the Derived is solved (by unification), the original wanted (`w`)</span></span></span>
</pre>
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2119
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<td class="diff-line-num new_line old" data-linenumber="2111" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2119" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">will get kicked out.</span></span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="2120" style="width: 35px; color: rgba(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="2111" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2111
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<pre style="margin: 0;">+<span id="LC2111" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">[D] _ :: k ~ Type</span></span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="2120" style="width: 35px; color: rgba(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="2112" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2112
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<pre style="margin: 0;">+<span id="LC2112" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">[W] w :: (alpha :: k) ~ (Int :: Type)</span></span></span>
</pre>
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2120
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<td class="diff-line-num new_line" data-linenumber="2113" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2113
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<pre style="margin: 0;"> <span id="LC2113" class="line" lang="haskell"></span>
</pre>
</td>
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<td class="diff-line-num old old_line" data-linenumber="2121" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2121
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<td class="diff-line-num new_line old" data-linenumber="2114" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2121" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that, if we had [G] co1 :: k ~ Type available, then none of this code would</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="2122" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2122
</td>
<td class="diff-line-num new_line old" data-linenumber="2114" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2122" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">trigger, because flattening would have rewritten k to Type. That is,</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="2123" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2123
</td>
<td class="diff-line-num new_line old" data-linenumber="2114" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2123" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">`w` would look like [W] (alpha |> co1 :: Type) ~ (Int :: Type), and the tyvar</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="2124" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2124
</td>
<td class="diff-line-num new_line old" data-linenumber="2114" style="width: 35px; color: rgba(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="LC2124" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">case will trigger, correctly rewriting alpha to (Int |> sym co1).</span></span>
</pre>
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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="2125" style="width: 35px; color: rgba(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="2114" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2114
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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="LC2114" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that the Wanted is unchanged and will be irreducible. This all happens</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="2125" style="width: 35px; color: rgba(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="2115" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2115
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<pre style="margin: 0;">+<span id="LC2115" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in canEqTyVarHetero.</span></span>
</pre>
</td>
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<td class="diff-line-num new old_line" data-linenumber="2125" style="width: 35px; color: rgba(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="2116" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2116
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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="LC2116" class="line" lang="haskell"></span>
</pre>
</td>
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<td class="diff-line-num new old_line" data-linenumber="2125" style="width: 35px; color: rgba(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="2117" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2117
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<pre style="margin: 0;">+<span id="LC2117" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that, if we had [G] co1 :: k ~ Type available, then we never get</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="2125" style="width: 35px; color: rgba(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="2118" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2118
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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="LC2118" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to canEqTyVarHetero: canEqTyVar tries flattening the kinds first. If</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="2125" style="width: 35px; color: rgba(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="2119" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2119
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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="LC2119" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we have [G] co1 :: k ~ Type, then flattening the kind of alpha would</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="2125" style="width: 35px; color: rgba(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="2120" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2120
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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="LC2120" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">rewrite k to Type, and we would end up in canEqTyVarHomo.</span></span>
</pre>
</td>
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<td class="diff-line-num old_line" data-linenumber="2125" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2125
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<td class="diff-line-num new_line" data-linenumber="2121" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2121
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<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC2121" class="line" lang="haskell"></span>
</pre>
</td>
</tr>
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<td class="diff-line-num old_line" data-linenumber="2126" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2126
</td>
<td class="diff-line-num new_line" data-linenumber="2122" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2122
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<pre style="margin: 0;"> <span id="LC2122" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Successive canonicalizations of the same Wanted may produce</span></span>
</pre>
</td>
</tr>
<tr class="line_holder" id="" style="line-height: 1.6;">
<td class="diff-line-num old_line" data-linenumber="2127" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2127
</td>
<td class="diff-line-num new_line" data-linenumber="2123" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2123
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<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC2123" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">duplicate Deriveds. Similar duplications can happen with fundeps, and there</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="2128" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2128
</td>
<td class="diff-line-num new_line" data-linenumber="2124" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2124
</td>
<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC2124" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">seems to be no easy way to avoid. I expect this case to be rare.</span></span>
</pre>
</td>
</tr>
<tr class="line_holder" id="" style="line-height: 1.6;">
<td class="diff-line-num old_line" data-linenumber="2129" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2129
</td>
<td class="diff-line-num new_line" data-linenumber="2125" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2125
</td>
<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC2125" 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="2130" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2130
</td>
<td class="diff-line-num new_line old" data-linenumber="2126" style="width: 35px; color: rgba(0,0,0,0.3); 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="LC2130" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For Givens, this problem doesn't bite, so a heterogeneous Given gives</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="2131" style="width: 35px; color: rgba(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="2126" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2126
</td>
<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">
<pre style="margin: 0;">+<span id="LC2126" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For Givens, this problem (the Wanteds-rewriting-Wanteds action of</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="2131" style="width: 35px; color: rgba(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="2127" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2127
</td>
<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">
<pre style="margin: 0;">+<span id="LC2127" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">a kind coercion) doesn't bite, so a heterogeneous Given gives</span></span>
</pre>
</td>
</tr>
<tr class="line_holder" id="" style="line-height: 1.6;">
<td class="diff-line-num old_line" data-linenumber="2131" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2131
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<td class="diff-line-num new_line" data-linenumber="2128" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2128
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<pre style="margin: 0;"> <span id="LC2128" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">rise to a Given kind equality. No Deriveds here. We thus homogenise</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2132" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2132
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<td class="diff-line-num new_line old" data-linenumber="2129" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2132" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the Given (see the "homo_co" in the Given case in canEqTyVar) and</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="2133" style="width: 35px; color: rgba(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="2129" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2129
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<pre style="margin: 0;">+<span id="LC2129" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the Given (see the "homo_co" in the Given case in canEqTyVar<span class="idiff left right">Hetero</span>) and</span></span>
</pre>
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2133
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<td class="diff-line-num new_line" data-linenumber="2130" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2130
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<pre style="margin: 0;"> <span id="LC2130" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">carry on with a homogeneous equality constraint.</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="2134" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2134
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<td class="diff-line-num new_line" data-linenumber="2131" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2131
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<pre style="margin: 0;"> <span id="LC2131" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2135" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2135
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<td class="diff-line-num new_line old" data-linenumber="2132" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2135" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Separately, I (Richard E) spent some time pondering what to do in the case</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2136" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2136
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<td class="diff-line-num new_line old" data-linenumber="2132" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2136" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that we have [W] (tv |> co1 :: k1) ~ (tv |> co2 :: k2) where k1 and k2</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2137" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2137
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<td class="diff-line-num new_line old" data-linenumber="2132" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2137" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">differ. Note that the tv is the same. (This case is handled as the first</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2138" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2138
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<td class="diff-line-num new_line old" data-linenumber="2132" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2138" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">case in canEqTyVarHomo.) At one point, I thought we could solve this limited</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2139" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2139
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<td class="diff-line-num new_line old" data-linenumber="2132" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2139" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">form of heterogeneous Wanted, but I then reconsidered and now treat this case</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2140" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2140
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<td class="diff-line-num new_line old" data-linenumber="2132" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2140" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">just like any other heterogeneous Wanted.</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2141" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2141
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<pre style="margin: 0;">-<span id="LC2141" class="line" lang="haskell"></span>
</pre>
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2142
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2132
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<pre style="margin: 0;"> <span id="LC2132" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Type synonyms and canonicalization]</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="2143" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2143
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<td class="diff-line-num new_line" data-linenumber="2133" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2133
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<pre style="margin: 0;"> <span id="LC2133" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
</pre>
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2144
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2134
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<pre style="margin: 0;"> <span id="LC2134" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We treat type synonym applications as xi types, that is, they do not</span></span>
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<li id="c573dfc3158e7ec41ecc0965becd5f1e6e92a2e6">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/19ab32c5fb3ebd88927b94acf6b348facc1552a2#c573dfc3158e7ec41ecc0965becd5f1e6e92a2e6"><strong>compiler/typecheck/TcErrors.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">@@ -158,14 +158,22 @@ reportUnsolved wanted</td>
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<td class="diff-line-num new_line" data-linenumber="158" style="width: 35px; color: rgba(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="LC158" class="line" lang="haskell"><span class="cd">-- | Report *all* unsolved goals as errors, even if -fdefer-type-errors is on</span></span>
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<td class="diff-line-num old_line" data-linenumber="159" style="width: 35px; color: rgba(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="LC159" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- However, do not make any evidence bindings, because we don't</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="160" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
160
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<td class="diff-line-num new_line" data-linenumber="160" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
160
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<pre style="margin: 0;"> <span id="LC160" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- have any convenient place to put them.</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="161" style="width: 35px; color: rgba(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="161" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
161
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<pre style="margin: 0;">+<span id="LC161" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- NB: Type-level holes are OK, because there are no bindings.</span></span>
</pre>
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161
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162
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<pre style="margin: 0;"> <span id="LC162" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Deferring coercion errors to runtime]</span></span>
</pre>
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162
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163
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<pre style="margin: 0;"> <span id="LC163" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Used by solveEqualities for kind equalities</span></span>
</pre>
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163
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<pre style="margin: 0;">-<span id="LC163" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--      (see Note [Fail fast on kind errors] in TcSimplify<span class="idiff left right">]</span></span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC164" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--      (see Note [Fail fast on kind errors] in TcSimplify<span class="idiff left right">)</span></span></span>
</pre>
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<pre style="margin: 0;"> <span id="LC165" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- and for simplifyDefault.</span></span>
</pre>
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165
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166
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<pre style="margin: 0;"> <span id="LC166" class="line" lang="haskell"><span class="n" style="color: #333;">reportAllUnsolved</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC167" class="line" lang="haskell"><span class="n" style="color: #333;">reportAllUnsolved</span> <span class="n" style="color: #333;">wanted</span></span>
</pre>
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<pre style="margin: 0;"> <span id="LC168" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">ev_binds</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newNoTcEvBinds</span></span>
</pre>
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<td class="diff-line-num new_line old" data-linenumber="169" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC168" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">report_unsolved</span> <span class="kt" style="color: #458; font-weight: 600;">TypeError</span> <span class="kt" style="color: #458; font-weight: 600;">HoleError</span> <span class="kt" style="color: #458; font-weight: 600;">HoleError</span> <span class="kt" style="color: #458; font-weight: 600;">HoleError</span></span>
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<pre style="margin: 0;">+<span id="LC169" class="line" lang="haskell"></span>
</pre>
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<pre style="margin: 0;">+<span id="LC170" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">partial_sigs</span>      <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">xoptM</span> <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">PartialTypeSignatures</span></span>
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171
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<pre style="margin: 0;">+<span id="LC171" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">warn_partial_sigs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">woptM</span> <span class="kt" style="color: #458; font-weight: 600;">Opt_WarnPartialTypeSignatures</span></span>
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<td class="diff-line-num new new_line" data-linenumber="172" style="width: 35px; color: rgba(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="LC172" class="line" lang="haskell">       <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">type_holes</span> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">partial_sigs</span>  <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HoleError</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="173" style="width: 35px; color: rgba(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="LC173" class="line" lang="haskell">                        <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">warn_partial_sigs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HoleWarn</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="n" style="color: #333;">otherwise</span>         <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">HoleDefer</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="LC175" class="line" lang="haskell"></span>
</pre>
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<pre style="margin: 0;">+<span id="LC176" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">report_unsolved</span> <span class="kt" style="color: #458; font-weight: 600;">TypeError</span> <span class="kt" style="color: #458; font-weight: 600;">HoleError</span> <span class="n" style="color: #333;">type_holes</span> <span class="kt" style="color: #458; font-weight: 600;">HoleError</span></span>
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<pre style="margin: 0;"> <span id="LC177" class="line" lang="haskell">                         <span class="n" style="color: #333;">ev_binds</span> <span class="n" style="color: #333;">wanted</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC178" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC179" class="line" lang="haskell"><span class="cd">-- | Report all unsolved goals as warnings (but without deferring any errors to</span></span>
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<br>
</li>
<li id="350c4076427c611b8f14e875a4ca553041c2b847">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/19ab32c5fb3ebd88927b94acf6b348facc1552a2#350c4076427c611b8f14e875a4ca553041c2b847"><strong>compiler/typecheck/TcHsType.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">@@ -11,7 +11,7 @@</td>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">TcHsType</span> <span class="p">(</span></span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="haskell">        <span class="c1" style="color: #998; font-style: italic;">-- Type signatures</span></span>
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<pre style="margin: 0;">-<span id="LC14" class="line" lang="haskell">        <span class="nf" style="color: #900; font-weight: 600;">kc<span class="idiff left right">H</span>sSigType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcClassSigType</span><span class="p">,</span></span>
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<td class="diff-line-num new old_line" data-linenumber="15" style="width: 35px; color: rgba(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="LC14" class="line" lang="haskell">        <span class="nf" style="color: #900; font-weight: 600;">kc<span class="idiff left right">Clas</span>sSigType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcClassSigType</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell">        <span class="nf" style="color: #900; font-weight: 600;">tcHsSigType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcHsSigWcType</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell">        <span class="nf" style="color: #900; font-weight: 600;">tcHsPartialSigType</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell">        <span class="nf" style="color: #900; font-weight: 600;">funsSigCtxt</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">addSigCtxt</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pprSigCtxt</span><span class="p">,</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="187" style="width: 35px; color: rgba(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="187" style="width: 35px; color: rgba(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">@@ -187,24 +187,40 @@ tcHsSigWcType :: UserTypeCtxt -> LHsSigWcType GhcRn -> TcM Type</td>
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<pre style="margin: 0;"> <span id="LC187" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- already checked this, so we can simply ignore it.</span></span>
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<pre style="margin: 0;"> <span id="LC188" class="line" lang="haskell"><span class="n" style="color: #333;">tcHsSigWcType</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">sig_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcHsSigType</span> <span class="n" style="color: #333;">ctxt</span> <span class="p">(</span><span class="n" style="color: #333;">dropWildCards</span> <span class="n" style="color: #333;">sig_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC189" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC190" class="line" lang="haskell"><span class="n" style="color: #333;">kcHsSigType</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsSigType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">-<span id="LC191" class="line" lang="haskell"><span class="n" style="color: #333;">kcHsSigType</span> <span class="n" style="color: #333;">names</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsIB</span> <span class="p">{</span> <span class="n" style="color: #333;">hsib_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_ty</span></span>
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<td class="diff-line-num new_line old" 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">
 
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<pre style="margin: 0;">-<span id="LC192" class="line" lang="haskell">                                  <span class="p">,</span> <span class="n" style="color: #333;">hsib_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sig_vars</span> <span class="p">})</span></span>
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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="n" style="color: #333;">addSigCtxt</span> <span class="p">(</span><span class="n" style="color: #333;">funsSigCtxt</span> <span class="n" style="color: #333;">names</span><span class="p">)</span> <span class="n" style="color: #333;">hs_ty</span> <span class="o" style="font-weight: 600;">$</span></span>
</pre>
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194
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<pre style="margin: 0;">-<span id="LC194" class="line" lang="haskell">    <span class="n" style="color: #333;">discardResult</span> <span class="o" style="font-weight: 600;">$</span></span>
</pre>
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195
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<pre style="margin: 0;">-<span id="LC195" class="line" lang="haskell">    <span class="n" style="color: #333;">bindImplicitTKBndrs_Skol</span> <span class="n" style="color: #333;">sig_vars</span> <span class="o" style="font-weight: 600;">$</span></span>
</pre>
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196
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<pre style="margin: 0;">-<span id="LC196" class="line" lang="haskell">    <span class="n" style="color: #333;">tc_lhs_type</span> <span class="n" style="color: #333;">typeLevelMode</span> <span class="n" style="color: #333;">hs_ty</span> <span class="n" style="color: #333;">liftedTypeKind</span></span>
</pre>
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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="n" style="color: #333;">kcHsSigType</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XHsImplicitBndrs</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"kcHsSigType"</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC190" class="line" lang="haskell"><span class="n" style="color: #333;">kcClassSigType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SkolemInfo</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsSigType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC191" class="line" lang="haskell"><span class="n" style="color: #333;">kcClassSigType</span> <span class="n" style="color: #333;">skol_info</span> <span class="n" style="color: #333;">names</span> <span class="n" style="color: #333;">sig_ty</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC192" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">discardResult</span> <span class="o" style="font-weight: 600;">$</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC193" class="line" lang="haskell">    <span class="n" style="color: #333;">tcClassSigType</span> <span class="n" style="color: #333;">skol_info</span> <span class="n" style="color: #333;">names</span> <span class="n" style="color: #333;">sig_ty</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC194" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- tcClassSigType does a fair amount of extra work that we don't need,</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="195" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC195" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- such as ordering quantified variables. But we absolutely do need</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="196" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC196" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- to push the level when checking method types and solve local equalities,</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="197" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC197" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- and so it seems easier just to call tcClassSigType than selectively</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="198" style="width: 35px; color: rgba(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="LC198" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- extract the lines of code from tc_hs_sig_type that we really need.</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="199" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
199
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<pre style="margin: 0;">+<span id="LC199" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- If we don't push the level, we get #16517, where GHC accepts</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="200" style="width: 35px; color: rgba(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="LC200" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">--   class C a where</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="199" style="width: 35px; color: rgba(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="c1" style="color: #998; font-style: italic;">--     meth :: forall k. Proxy (a :: k) -> ()</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC202" class="line" lang="haskell">  <span class="c1" style="color: #998; font-style: italic;">-- Note that k is local to meth -- this is hogwash.</span></span>
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<pre style="margin: 0;"> <span id="LC203" class="line" lang="haskell"></span>
</pre>
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<pre style="margin: 0;"> <span id="LC204" class="line" lang="haskell"><span class="n" style="color: #333;">tcClassSigType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SkolemInfo</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Located</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsSigType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</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="LC205" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Does not do validity checking</span></span>
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<pre style="margin: 0;"> <span id="LC206" class="line" lang="haskell"><span class="n" style="color: #333;">tcClassSigType</span> <span class="n" style="color: #333;">skol_info</span> <span class="n" style="color: #333;">names</span> <span class="n" style="color: #333;">sig_ty</span></span>
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<pre style="margin: 0;"> <span id="LC207" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addSigCtxt</span> <span class="p">(</span><span class="n" style="color: #333;">funsSigCtxt</span> <span class="n" style="color: #333;">names</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">hsSigType</span> <span class="n" style="color: #333;">sig_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC204" class="line" lang="haskell">    <span class="n" style="color: #333;">tc_hs_sig_type</span> <span class="n" style="color: #333;">skol_info</span> <span class="n" style="color: #333;">sig_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TheKind</span> <span class="n" style="color: #333;">liftedTypeKind</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC208" class="line" lang="haskell">    <span class="n" style="color: #333;"><span class="idiff left">snd</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><$></span></span><span class="idiff right"> </span><span class="n" style="color: #333;">tc_hs_sig_type</span> <span class="n" style="color: #333;">skol_info</span> <span class="n" style="color: #333;">sig_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TheKind</span> <span class="n" style="color: #333;">liftedTypeKind</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC209" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- Do not zonk-to-Type, nor perform a validity check</span></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;">-- We are in a knot with the class and associated types</span></span>
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<pre style="margin: 0;"> <span id="LC211" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- Zonking and validity checking is done by tcClassDecl</span></span>
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<pre style="margin: 0;">+<span id="LC212" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- No need to fail here if the type has an error:</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC213" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">--   If we're in the kind-checking phase, the solveEqualities</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC214" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">--     in kcTyClGroup catches the error</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC215" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">--   If we're in the type-checking phase, the solveEqualities</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC216" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">--     in tcClassDecl1 gets it</span></span>
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<pre style="margin: 0;">+<span id="LC217" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- Failing fast here degrades the error message in, e.g., tcfail135:</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC218" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">--   class Foo f where</span></span>
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<pre style="margin: 0;">+<span id="LC219" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">--     baa :: f a -> f</span></span>
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<pre style="margin: 0;">+<span id="LC220" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- If we fail fast, we're told that f has kind `k1` when we wanted `*`.</span></span>
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<pre style="margin: 0;">+<span id="LC221" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- It should be that f has kind `k2 -> *`, but we never get a chance</span></span>
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<pre style="margin: 0;">+<span id="LC222" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- to run the solver where the kind of f is touchable. This is</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;">-- painfully delicate.</span></span>
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<pre style="margin: 0;"> <span id="LC224" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC225" class="line" lang="haskell"><span class="n" style="color: #333;">tcHsSigType</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;">LHsSigType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</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="LC226" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Does validity checking</span></span>
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<pre style="margin: 0;"> <span id="LC230" class="line" lang="haskell">    <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;">"tcHsSigType {"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">sig_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC231" class="line" lang="haskell"></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;">-- Generalise here: see Note [Kind generalisation]</span></span>
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<pre style="margin: 0;">-<span id="LC217" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;"><span class="idiff left right">ty</span></span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tc_hs_sig_type</span> <span class="n" style="color: #333;">skol_info</span> <span class="n" style="color: #333;">sig_ty</span></span>
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<pre style="margin: 0;">-<span id="LC218" class="line" lang="haskell">                                      <span class="p">(</span><span class="n" style="color: #333;">expectedKindInCtxt</span> <span class="n" style="color: #333;">ctxt</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC233" class="line" lang="haskell">       <span class="p">;</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">insol</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ty</span></span><span class="p"><span class="idiff right">)</span></span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tc_hs_sig_type</span> <span class="n" style="color: #333;">skol_info</span> <span class="n" style="color: #333;">sig_ty</span></span>
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<pre style="margin: 0;">+<span id="LC234" class="line" lang="haskell">                                      <span class="idiff left right"> </span><span class="p">(</span><span class="n" style="color: #333;">expectedKindInCtxt</span> <span class="n" style="color: #333;">ctxt</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC235" class="line" lang="haskell">       <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;">zonkTcType</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC236" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC237" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">when</span> <span class="n" style="color: #333;">insol</span> <span class="n" style="color: #333;">failM</span></span>
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<pre style="margin: 0;">+<span id="LC238" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- See Note [Fail fast if there are insoluble kind equalities] in TcSimplify</span></span>
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<pre style="margin: 0;">+<span id="LC239" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC240" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">checkValidType</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC241" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"end tcHsSigType }"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC242" 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>
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<pre style="margin: 0;"> <span id="LC244" class="line" lang="haskell">    <span class="n" style="color: #333;">skol_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SigTypeSkol</span> <span class="n" style="color: #333;">ctxt</span></span>
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<pre style="margin: 0;"> <span id="LC245" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC246" class="line" lang="haskell"><span class="n" style="color: #333;">tc_hs_sig_type</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SkolemInfo</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsSigType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span></span>
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<pre style="margin: 0;">-<span id="LC228" class="line" lang="haskell">               <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ContextKind</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;"><span class="idiff left right">Type</span></span></span>
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<pre style="margin: 0;">+<span id="LC247" class="line" lang="haskell">               <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ContextKind</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Bool</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">TcType</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;"> <span id="LC248" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Kind-checks/desugars an 'LHsSigType',</span></span>
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<pre style="margin: 0;"> <span id="LC249" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--   solve equalities,</span></span>
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<pre style="margin: 0;"> <span id="LC250" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--   and then kind-generalizes.</span></span>
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<pre style="margin: 0;"> <span id="LC251" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This will never emit constraints, as it uses solveEqualities interally.</span></span>
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<pre style="margin: 0;"> <span id="LC252" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- No validity checking or zonking</span></span>
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<pre style="margin: 0;">+<span id="LC253" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returns also a Bool indicating whether the type induced an insoluble constraint;</span></span>
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<pre style="margin: 0;">+<span id="LC254" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- True <=> constraint is insoluble</span></span>
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<pre style="margin: 0;"> <span id="LC255" class="line" lang="haskell"><span class="n" style="color: #333;">tc_hs_sig_type</span> <span class="n" style="color: #333;">skol_info</span> <span class="n" style="color: #333;">hs_sig_type</span> <span class="n" style="color: #333;">ctxt_kind</span></span>
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<pre style="margin: 0;"> <span id="LC256" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">HsIB</span> <span class="p">{</span> <span class="n" style="color: #333;">hsib_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sig_vars</span><span class="p">,</span> <span class="n" style="color: #333;">hsib_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_ty</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">hs_sig_type</span></span>
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<pre style="margin: 0;"> <span id="LC257" 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;">tc_lvl</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">wanted</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">spec_tkvs</span><span class="p">,</span> <span class="n" style="color: #333;">ty</span><span class="p">)))</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="238" style="width: 35px; color: rgba(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="259" style="width: 35px; color: rgba(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">@@ -238,7 +259,6 @@ tc_hs_sig_type skol_info hs_sig_type ctxt_kind</td>
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<pre style="margin: 0;"> <span id="LC259" class="line" lang="haskell">                 <span class="n" style="color: #333;">solveLocalEqualitiesX</span> <span class="s" style="color: #d14;">"tc_hs_sig_type"</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC260" class="line" lang="haskell">                 <span class="n" style="color: #333;">bindImplicitTKBndrs_Skol</span> <span class="n" style="color: #333;">sig_vars</span>      <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC261" class="line" lang="haskell">                 <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">kind</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">newExpectedKind</span> <span class="n" style="color: #333;">ctxt_kind</span></span>
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<pre style="margin: 0;">-<span id="LC241" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC262" class="line" lang="haskell">                    <span class="p">;</span> <span class="n" style="color: #333;">tc_lhs_type</span> <span class="n" style="color: #333;">typeLevelMode</span> <span class="n" style="color: #333;">hs_ty</span> <span class="n" style="color: #333;">kind</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC263" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- Any remaining variables (unsolved in the solveLocalEqualities)</span></span>
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<pre style="margin: 0;"> <span id="LC264" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- should be in the global tyvars, and therefore won't be quantified</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="249" style="width: 35px; color: rgba(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="269" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -249,9 +269,9 @@ tc_hs_sig_type skol_info hs_sig_type ctxt_kind</td>
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<pre style="margin: 0;"> <span id="LC269" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">emitResidualTvConstraint</span> <span class="n" style="color: #333;">skol_info</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="p">(</span><span class="n" style="color: #333;">kvs</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">spec_tkvs</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC270" class="line" lang="haskell">                                  <span class="n" style="color: #333;">tc_lvl</span> <span class="n" style="color: #333;">wanted</span></span>
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<pre style="margin: 0;"> <span id="LC271" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC252" 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;">mkInvForAllTys</span> <span class="n" style="color: #333;">kvs</span> <span class="n" style="color: #333;">ty1</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC272" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;"><span class="idiff left">insolubleWC</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">wanted</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">mkInvForAllTys</span> <span class="n" style="color: #333;">kvs</span> <span class="n" style="color: #333;">ty1</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC273" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC254" class="line" lang="haskell"><span class="n" style="color: #333;">tc_hs_sig_type</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XHsImplicitBndrs</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"tc_hs_sig_type<span class="idiff left right">_and_gen</span>"</span></span>
</pre>
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274
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<pre style="margin: 0;">+<span id="LC274" class="line" lang="haskell"><span class="n" style="color: #333;">tc_hs_sig_type</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XHsImplicitBndrs</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"tc_hs_sig_type"</span></span>
</pre>
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255
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<td class="diff-line-num new_line" data-linenumber="275" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
275
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<pre style="margin: 0;"> <span id="LC275" class="line" lang="haskell"></span>
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256
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276
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<pre style="margin: 0;"> <span id="LC276" class="line" lang="haskell"><span class="n" style="color: #333;">tcTopLHsType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LHsSigType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ContextKind</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>
</pre>
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277
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<pre style="margin: 0;"> <span id="LC277" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- tcTopLHsType is used for kind-checking top-level HsType where</span></span>
</pre>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2056" style="width: 35px; color: rgba(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="2076" style="width: 35px; color: rgba(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">@@ -2056,7 +2076,8 @@ kindGeneralize :: TcType -> TcM [KindVar]</td>
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<pre style="margin: 0;"> <span id="LC2076" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Quantify the free kind variables of a kind or type</span></span>
</pre>
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<pre style="margin: 0;"> <span id="LC2077" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- In the latter case the type is closed, so it has no free</span></span>
</pre>
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<pre style="margin: 0;"> <span id="LC2078" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- type variables.  So in both cases, all the free vars are kind vars</span></span>
</pre>
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<pre style="margin: 0;">-<span id="LC2059" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Input needn't be zonked.</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC2079" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Input needn't be zonked. All variables to be quantified must</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC2080" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- have a TcLevel higher than the ambient TcLevel.</span></span>
</pre>
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<td class="diff-line-num new_line" data-linenumber="2081" style="width: 35px; color: rgba(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="LC2081" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- NB: You must call solveEqualities or solveLocalEqualities before</span></span>
</pre>
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2061
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2082
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<pre style="margin: 0;"> <span id="LC2082" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- kind generalization</span></span>
</pre>
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2062
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<td class="diff-line-num new_line" data-linenumber="2083" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2083
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<pre style="margin: 0;"> <span id="LC2083" 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 unfold js-unfold old_line" data-linenumber="2074" style="width: 35px; color: rgba(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="2095" style="width: 35px; color: rgba(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">@@ -2074,7 +2095,8 @@ kindGeneralize kind_or_type</td>
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<pre style="margin: 0;"> <span id="LC2095" class="line" lang="haskell"></span>
</pre>
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2096
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<pre style="margin: 0;"> <span id="LC2096" class="line" lang="haskell"><span class="cd">-- | This variant of 'kindGeneralize' refuses to generalize over any</span></span>
</pre>
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<pre style="margin: 0;"> <span id="LC2097" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- variables free in the given WantedConstraints. Instead, it promotes</span></span>
</pre>
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<td class="diff-line-num new_line old" data-linenumber="2098" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2077" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- these variables into an outer TcLevel. See also</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="2098" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2098
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<pre style="margin: 0;">+<span id="LC2098" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- these variables into an outer TcLevel. All variables to be quantified must</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="2078" style="width: 35px; color: rgba(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="2099" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2099
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<pre style="margin: 0;">+<span id="LC2099" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- have a TcLevel higher than the ambient TcLevel. See also</span></span>
</pre>
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2078
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<td class="diff-line-num new_line" data-linenumber="2100" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2100
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<pre style="margin: 0;"> <span id="LC2100" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note [Promoting unification variables] in TcSimplify</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="2079" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2079
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<td class="diff-line-num new_line" data-linenumber="2101" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2101
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<pre style="margin: 0;"> <span id="LC2101" class="line" lang="haskell"><span class="n" style="color: #333;">kindGeneralizeLocal</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">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;">KindVar</span><span class="p">]</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="2080" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2080
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<td class="diff-line-num new_line" data-linenumber="2102" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2102
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<pre style="margin: 0;"> <span id="LC2102" class="line" lang="haskell"><span class="n" style="color: #333;">kindGeneralizeLocal</span> <span class="n" style="color: #333;">wanted</span> <span class="n" style="color: #333;">kind_or_type</span></span>
</pre>
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</li>
<li id="367db94fc37c8c7548dbe545a5302c7a5108e41e">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/19ab32c5fb3ebd88927b94acf6b348facc1552a2#367db94fc37c8c7548dbe545a5302c7a5108e41e"><strong>compiler/typecheck/TcMType.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_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">...</td>
<td class="diff-line-num unfold js-unfold 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">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -759,14 +759,14 @@ writeMetaTyVar tyvar ty</td>
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759
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<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
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<pre style="margin: 0;"> <span id="LC759" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="760" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
760
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<td class="diff-line-num new_line" data-linenumber="760" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
760
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<pre style="margin: 0;"> <span id="LC760" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Everything from here on only happens if DEBUG is on</span></span>
</pre>
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<td class="diff-line-num old_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
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<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
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<pre style="margin: 0;"> <span id="LC761" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">isTcTyVar</span> <span class="n" style="color: #333;">tyvar</span><span class="p">)</span></span>
</pre>
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<td class="diff-line-num old old_line" 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">
762
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<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">
 
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<pre style="margin: 0;">-<span id="LC762" 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">WARN</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 right">Tru</span>e</span><span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Writing to non-tc tyvar"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tyvar</span> <span class="p">)</span></span>
</pre>
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<td class="diff-line-num new old_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">
 
</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
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<pre style="margin: 0;">+<span id="LC762" 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">ASSERT2</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 right">Fals</span>e</span><span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Writing to non-tc tyvar"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tyvar</span> <span class="p">)</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="763" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
763
</td>
<td class="diff-line-num new_line" data-linenumber="763" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
763
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<pre style="margin: 0;"> <span id="LC763" class="line" lang="haskell">    <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
</pre>
</td>
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<td class="diff-line-num old_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
</td>
<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
</td>
<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC764" class="line" lang="haskell"></span>
</pre>
</td>
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<td class="diff-line-num old_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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<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="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">MetaTv</span> <span class="p">{</span> <span class="n" style="color: #333;">mtv_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;">tcTyVarDetails</span> <span class="n" style="color: #333;">tyvar</span></span>
</pre>
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<td class="diff-line-num old_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
</td>
<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="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">writeMetaTyVarRef</span> <span class="n" style="color: #333;">tyvar</span> <span class="n" style="color: #333;">ref</span> <span class="n" style="color: #333;">ty</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="767" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
767
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<td class="diff-line-num new_line" data-linenumber="767" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
767
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<pre style="margin: 0;"> <span id="LC767" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="768" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
768
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<td class="diff-line-num new_line" data-linenumber="768" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
768
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<pre style="margin: 0;"> <span id="LC768" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="769" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
769
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<pre style="margin: 0;">-<span id="LC769" 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">WARN</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 right">Tru</span>e</span><span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Writing to non-meta tyvar"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tyvar</span> <span class="p">)</span></span>
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769
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<pre style="margin: 0;">+<span id="LC769" 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">ASSERT2</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 right">Fals</span>e</span><span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Writing to non-meta tyvar"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tyvar</span> <span class="p">)</span></span>
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770
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770
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<pre style="margin: 0;"> <span id="LC770" class="line" lang="haskell">    <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
</pre>
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771
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771
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<pre style="margin: 0;"> <span id="LC771" class="line" lang="haskell"></span>
</pre>
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772
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772
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<pre style="margin: 0;"> <span id="LC772" 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 unfold js-unfold old_line" data-linenumber="1066" style="width: 35px; color: rgba(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">@@ -1066,18 +1066,18 @@ we are trying to generalise this type:</td>
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1066
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1066
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<pre style="margin: 0;"> <span id="LC1066" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  forall arg. ... (alpha[tau]:arg) ...</span></span>
</pre>
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1067
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1067
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<pre style="margin: 0;"> <span id="LC1067" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="1068" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1068
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1068
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<pre style="margin: 0;"> <span id="LC1068" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We have a metavariable alpha whose kind mentions a skolem variable</span></span>
</pre>
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1069
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<td class="diff-line-num new_line old" data-linenumber="1069" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC1069" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">bou<span class="idiff left right">dn</span> inside the very type we are generalising.</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="1070" style="width: 35px; color: rgba(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="1069" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1069
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<pre style="margin: 0;">+<span id="LC1069" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">bou<span class="idiff left right">nd</span> inside the very type we are generalising.</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="1070" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1070
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<td class="diff-line-num new_line" data-linenumber="1070" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1070
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<pre style="margin: 0;"> <span id="LC1070" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This can arise while type-checking a user-written type signature</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="1071" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1071
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<td class="diff-line-num new_line" data-linenumber="1071" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1071
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<pre style="margin: 0;"> <span id="LC1071" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(see the test case for the full code).</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="1072" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1072
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1072
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<pre style="margin: 0;"> <span id="LC1072" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="1073" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1073
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<td class="diff-line-num new_line" data-linenumber="1073" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1073
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<pre style="margin: 0;"> <span id="LC1073" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We cannot generalise over alpha!  That would produce a type like</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="1074" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1074
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<td class="diff-line-num new_line" data-linenumber="1074" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1074
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<pre style="margin: 0;"> <span id="LC1074" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  forall {a :: arg}. forall arg. ...blah...</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="1075" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1075
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<td class="diff-line-num new_line" data-linenumber="1075" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1075
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<pre style="margin: 0;"> <span id="LC1075" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The fact that alpha's kind mentions arg renders it completely</span></span>
</pre>
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1076
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<td class="diff-line-num new_line old" data-linenumber="1076" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC1076" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">ineligible for generaliation.</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="1077" style="width: 35px; color: rgba(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="1076" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1076
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<pre style="margin: 0;">+<span id="LC1076" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">ineligible for generali<span class="idiff left right">s</span>ation.</span></span>
</pre>
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1077
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<td class="diff-line-num new_line" data-linenumber="1077" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1077
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<pre style="margin: 0;"> <span id="LC1077" class="line" lang="haskell"></span>
</pre>
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1078
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1078
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<pre style="margin: 0;"> <span id="LC1078" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">However, we are not going to learn any new constraints on alpha,</span></span>
</pre>
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1079
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<pre style="margin: 0;">-<span id="LC1079" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">because its kind isn't even in scope in the outer context<span class="idiff left right">.  So alpha</span></span></span>
</pre>
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1080
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<pre style="margin: 0;">-<span id="LC1080" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is entirely unconstrained.</span></span>
</pre>
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1079
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<pre style="margin: 0;">+<span id="LC1079" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">because its kind isn't even in scope in the outer context<span class="idiff left right"> (but see Wrinkle).</span></span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="1081" style="width: 35px; color: rgba(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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1080
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<pre style="margin: 0;">+<span id="LC1080" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">So alpha </span>is entirely unconstrained.</span></span>
</pre>
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1081
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1081
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<pre style="margin: 0;"> <span id="LC1081" class="line" lang="haskell"></span>
</pre>
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1082
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1082
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<pre style="margin: 0;"> <span id="LC1082" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">What then should we do with alpha?  During generalization, every</span></span>
</pre>
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1083
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1083
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<pre style="margin: 0;"> <span id="LC1083" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">metavariable is either (A) promoted, (B) generalized, or (C) zapped</span></span>
</pre>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1098" style="width: 35px; color: rgba(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="1098" style="width: 35px; color: rgba(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">@@ -1098,6 +1098,17 @@ We do this eager zapping in candidateQTyVars, which always precedes</td>
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1098
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1098
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<pre style="margin: 0;"> <span id="LC1098" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">generalisation, because at that moment we have a clear picture of</span></span>
</pre>
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1099
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1099
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<pre style="margin: 0;"> <span id="LC1099" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">what skolems are in scope.</span></span>
</pre>
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1100
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1100
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<pre style="margin: 0;"> <span id="LC1100" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="1101" style="width: 35px; color: rgba(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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1101
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<pre style="margin: 0;">+<span id="LC1101" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Wrinkle:</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="1102" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1102
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<pre style="margin: 0;">+<span id="LC1102" class="line" lang="haskell"></span>
</pre>
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1103
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<pre style="margin: 0;">+<span id="LC1103" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We must make absolutely sure that alpha indeed is not</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="1101" style="width: 35px; color: rgba(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="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="cm" style="color: #998; font-style: italic;">from an outer context. (Otherwise, we might indeed learn more information</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="1105" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1105
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<pre style="margin: 0;">+<span id="LC1105" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">about it.) This can be done easily: we just check alpha's TcLevel.</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="1101" style="width: 35px; color: rgba(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="cm" style="color: #998; font-style: italic;">That level must be strictly greater than the ambient TcLevel in order</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="1101" style="width: 35px; color: rgba(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="1107" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1107
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<pre style="margin: 0;">+<span id="LC1107" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to treat it as naughty. We say "strictly greater than" because the call to</span></span>
</pre>
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<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="cm" style="color: #998; font-style: italic;">candidateQTyVars is made outside the bumped TcLevel, as stated in the</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="1101" style="width: 35px; color: rgba(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="1109" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1109
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<pre style="margin: 0;">+<span id="LC1109" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">comment to candidateQTyVarsOfType. The level check is done in go_tv</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="1101" style="width: 35px; color: rgba(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="1110" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1110
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<pre style="margin: 0;">+<span id="LC1110" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in collect_cant_qtvs. Skipping this check caused #16517.</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="1101" style="width: 35px; color: rgba(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="1111" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1111
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<pre style="margin: 0;">+<span id="LC1111" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num old_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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<td class="diff-line-num new_line" data-linenumber="1112" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1112
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<pre style="margin: 0;"> <span id="LC1112" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
</pre>
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<td class="diff-line-num old_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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<td class="diff-line-num new_line" data-linenumber="1113" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1113
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<pre style="margin: 0;"> <span id="LC1113" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="1103" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1103
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<td class="diff-line-num new_line" data-linenumber="1114" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1114
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<pre style="margin: 0;"> <span id="LC1114" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">CandidatesQTvs</span></span>
</pre>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1145" style="width: 35px; color: rgba(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="1156" style="width: 35px; color: rgba(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">@@ -1145,13 +1156,17 @@ candidateKindVars dvs = dVarSetToVarSet (dv_kvs dvs)</td>
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<td class="diff-line-num old_line" data-linenumber="1145" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1145
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<td class="diff-line-num new_line" data-linenumber="1156" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1156
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<pre style="margin: 0;"> <span id="LC1156" class="line" lang="haskell"><span class="cd">-- | Gathers free variables to use as quantification candidates (in</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="1146" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1146
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<td class="diff-line-num new_line" data-linenumber="1157" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1157
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<pre style="margin: 0;"> <span id="LC1157" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'quantifyTyVars'). This might output the same var</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="1147" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1147
</td>
<td class="diff-line-num new_line" data-linenumber="1158" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1158
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<pre style="margin: 0;"> <span id="LC1158" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- in both sets, if it's used in both a type and a kind.</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="1148" style="width: 35px; color: rgba(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="1159" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1159
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<pre style="margin: 0;">+<span id="LC1159" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The variables to quantify must have a TcLevel strictly greater than</span></span>
</pre>
</td>
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<td class="diff-line-num new old_line" data-linenumber="1148" style="width: 35px; color: rgba(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="1160" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1160
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<pre style="margin: 0;">+<span id="LC1160" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the ambient level. (See Wrinkle in Note [Naughty quantification candidates])</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="1148" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1148
</td>
<td class="diff-line-num new_line" data-linenumber="1161" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1161
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<pre style="margin: 0;"> <span id="LC1161" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [CandidatesQTvs determinism and order]</span></span>
</pre>
</td>
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<td class="diff-line-num old_line" data-linenumber="1149" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1149
</td>
<td class="diff-line-num new_line" data-linenumber="1162" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1162
</td>
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<pre style="margin: 0;"> <span id="LC1162" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Dependent type variables]</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="1150" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1150
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<td class="diff-line-num new_line" data-linenumber="1163" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1163
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<pre style="margin: 0;"> <span id="LC1163" class="line" lang="haskell"><span class="n" style="color: #333;">candidateQTyVarsOfType</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span>       <span class="c1" style="color: #998; font-style: italic;">-- not necessarily zonked</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="1151" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1151
</td>
<td class="diff-line-num new_line" data-linenumber="1164" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1164
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<pre style="margin: 0;"> <span id="LC1164" 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;">CandidatesQTvs</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="1152" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1152
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<td class="diff-line-num new_line" data-linenumber="1165" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1165
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<pre style="margin: 0;"> <span id="LC1165" class="line" lang="haskell"><span class="n" style="color: #333;">candidateQTyVarsOfType</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">collect_cand_qtvs</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="n" style="color: #333;">emptyVarSet</span> <span class="n" style="color: #333;">mempty</span> <span class="n" style="color: #333;">ty</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="1153" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1153
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<td class="diff-line-num new_line" data-linenumber="1166" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1166
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<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC1166" class="line" lang="haskell"></span>
</pre>
</td>
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<td class="diff-line-num old old_line" data-linenumber="1154" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1154
</td>
<td class="diff-line-num new_line old" data-linenumber="1167" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC1154" class="line" lang="haskell"><span class="cd">-- | Like 'splitDepVarsOfType', but over a list of types</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="1155" style="width: 35px; color: rgba(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="1167" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1167
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<pre style="margin: 0;">+<span id="LC1167" class="line" lang="haskell"><span class="cd">-- | Like 'candidateQTyVarsOfType', but over a list of types</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="1155" style="width: 35px; color: rgba(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="1168" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1168
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<pre style="margin: 0;">+<span id="LC1168" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The variables to quantify must have a TcLevel strictly greater than</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="1155" style="width: 35px; color: rgba(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="1169" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1169
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<pre style="margin: 0;">+<span id="LC1169" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the ambient level. (See Wrinkle in Note [Naughty quantification candidates])</span></span>
</pre>
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1155
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<td class="diff-line-num new_line" data-linenumber="1170" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1170
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<pre style="margin: 0;"> <span id="LC1170" class="line" lang="haskell"><span class="n" style="color: #333;">candidateQTyVarsOfTypes</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">CandidatesQTvs</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="1156" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1156
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<td class="diff-line-num new_line" data-linenumber="1171" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1171
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<pre style="margin: 0;"> <span id="LC1171" class="line" lang="haskell"><span class="n" style="color: #333;">candidateQTyVarsOfTypes</span> <span class="n" style="color: #333;">tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldlM</span> <span class="p">(</span><span class="n" style="color: #333;">collect_cand_qtvs</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="n" style="color: #333;">emptyVarSet</span><span class="p">)</span> <span class="n" style="color: #333;">mempty</span> <span class="n" style="color: #333;">tys</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="1157" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1157
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<td class="diff-line-num new_line" data-linenumber="1172" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1172
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<pre style="margin: 0;"> <span id="LC1172" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1175" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1190" style="width: 35px; color: rgba(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">@@ -1175,7 +1190,7 @@ delCandidates (DV { dv_kvs = kvs, dv_tvs = tvs, dv_cvs = cvs }) vars</td>
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1175
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1190
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<pre style="margin: 0;"> <span id="LC1190" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="1176" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1176
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<td class="diff-line-num new_line" data-linenumber="1191" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1191
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<pre style="margin: 0;"> <span id="LC1191" class="line" lang="haskell"><span class="n" style="color: #333;">collect_cand_qtvs</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="1177" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1177
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<td class="diff-line-num new_line" data-linenumber="1192" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1192
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<pre style="margin: 0;"> <span id="LC1192" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span>            <span class="c1" style="color: #998; font-style: italic;">-- True <=> consider every fv in Type to be dependent</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="1178" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1178
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<td class="diff-line-num new_line old" data-linenumber="1193" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC1178" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span>          <span class="c1" style="color: #998; font-style: italic;">-- Bound variables (<span class="idiff left right">both locally bound and globally bound</span>)</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="1179" style="width: 35px; color: rgba(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="1193" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1193
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<pre style="margin: 0;">+<span id="LC1193" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span>          <span class="c1" style="color: #998; font-style: italic;">-- Bound variables (<span class="idiff left right">locals only</span>)</span></span>
</pre>
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1179
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<td class="diff-line-num new_line" data-linenumber="1194" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1194
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<pre style="margin: 0;"> <span id="LC1194" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">CandidatesQTvs</span>  <span class="c1" style="color: #998; font-style: italic;">-- Accumulating parameter</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="1180" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1180
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<td class="diff-line-num new_line" data-linenumber="1195" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1195
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<pre style="margin: 0;"> <span id="LC1195" 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;">-- Not necessarily zonked</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="1181" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1181
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<td class="diff-line-num new_line" data-linenumber="1196" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1196
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<pre style="margin: 0;"> <span id="LC1196" 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;">CandidatesQTvs</span></span>
</pre>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1220" style="width: 35px; color: rgba(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="1235" style="width: 35px; color: rgba(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">@@ -1220,16 +1235,26 @@ collect_cand_qtvs is_dep bound dvs ty</td>
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1220
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1235
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<pre style="margin: 0;"> <span id="LC1235" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num 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">
1221
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1236
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<pre style="margin: 0;"> <span id="LC1236" 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_line" data-linenumber="1222" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1222
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1237
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<pre style="margin: 0;"> <span id="LC1237" class="line" lang="haskell">    <span class="n" style="color: #333;">go_tv</span> <span class="n" style="color: #333;">dv</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DV</span> <span class="p">{</span> <span class="n" style="color: #333;">dv_kvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">kvs</span><span class="p">,</span> <span class="n" style="color: #333;">dv_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tvs</span> <span class="p">})</span> <span class="n" style="color: #333;">tv</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="1223" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1223
</td>
<td class="diff-line-num new_line old" data-linenumber="1238" style="width: 35px; color: rgba(0,0,0,0.3); 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="LC1223" class="line" lang="haskell">      <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">tv</span> <span class="p">`</span><span class="n" style="color: #333;">elemDVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">kvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">dv</span>  <span class="c1" style="color: #998; font-style: italic;">-- We have met this tyvar aleady</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="1224" style="width: 35px; color: rgba(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="1238" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1238
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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="LC1238" class="line" lang="haskell">      <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">tv</span> <span class="p">`</span><span class="n" style="color: #333;">elemDVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">kvs</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="1224" style="width: 35px; color: rgba(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="1239" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1239
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<pre style="margin: 0;">+<span id="LC1239" class="line" lang="haskell">      <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">dv</span>  <span class="c1" style="color: #998; font-style: italic;">-- We have met this tyvar aleady</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="1224" style="width: 35px; color: rgba(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="1240" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1240
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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="LC1240" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="1224" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1224
</td>
<td class="diff-line-num new_line" data-linenumber="1241" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1241
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<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC1241" 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;">is_dep</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="1225" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1225
</td>
<td class="diff-line-num new_line old" data-linenumber="1242" style="width: 35px; color: rgba(0,0,0,0.3); 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="LC1225" class="line" lang="haskell">      <span class="p">,</span> <span class="n" style="color: #333;">tv</span> <span class="p">`</span><span class="n" style="color: #333;">elemDVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">dv</span>  <span class="c1" style="color: #998; font-style: italic;">-- We have met this tyvar aleady</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="1226" style="width: 35px; color: rgba(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="1242" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1242
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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="LC1242" class="line" lang="haskell">      <span class="p">,</span> <span class="n" style="color: #333;">tv</span> <span class="p">`</span><span class="n" style="color: #333;">elemDVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">tvs</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="1226" style="width: 35px; color: rgba(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="1243" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1243
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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="LC1243" class="line" lang="haskell">      <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">dv</span>  <span class="c1" style="color: #998; font-style: italic;">-- We have met this tyvar aleady</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="1226" style="width: 35px; color: rgba(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="1244" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1244
</td>
<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">
<pre style="margin: 0;">+<span id="LC1244" class="line" lang="haskell"></span>
</pre>
</td>
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<td class="diff-line-num old_line" data-linenumber="1226" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1226
</td>
<td class="diff-line-num new_line" data-linenumber="1245" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1245
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<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC1245" class="line" lang="haskell">      <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
</pre>
</td>
</tr>
<tr class="line_holder" id="" style="line-height: 1.6;">
<td class="diff-line-num old_line" data-linenumber="1227" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1227
</td>
<td class="diff-line-num new_line" data-linenumber="1246" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1246
</td>
<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC1246" 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;">tv_kind</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkTcType</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>
</td>
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<tr class="line_holder" id="" style="line-height: 1.6;">
<td class="diff-line-num old_line" data-linenumber="1228" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1228
</td>
<td class="diff-line-num new_line" data-linenumber="1247" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1247
</td>
<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC1247" class="line" lang="haskell">                 <span class="c1" style="color: #998; font-style: italic;">-- This zonk is annoying, but it is necessary, both to</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="1229" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1229
</td>
<td class="diff-line-num new_line" data-linenumber="1248" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1248
</td>
<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC1248" class="line" lang="haskell">                 <span class="c1" style="color: #998; font-style: italic;">-- ensure that the collected candidates have zonked kinds</span></span>
</pre>
</td>
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<td class="diff-line-num old_line" data-linenumber="1230" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1230
</td>
<td class="diff-line-num new_line" data-linenumber="1249" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1249
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<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC1249" class="line" lang="haskell">                 <span class="c1" style="color: #998; font-style: italic;">-- (Trac #15795) and to make the naughty check</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="1231" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1231
</td>
<td class="diff-line-num new_line" data-linenumber="1250" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1250
</td>
<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC1250" class="line" lang="haskell">                 <span class="c1" style="color: #998; font-style: italic;">-- (which comes next) works correctly</span></span>
</pre>
</td>
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<td class="diff-line-num old old_line" data-linenumber="1232" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1232
</td>
<td class="diff-line-num new_line old" data-linenumber="1251" style="width: 35px; color: rgba(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="LC1232" class="line" lang="haskell">           <span class="p">;</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">intersectsVarSet</span> <span class="n" style="color: #333;">bound</span> <span class="p">(</span><span class="n" style="color: #333;">tyCoVarsOfType</span> <span class="n" style="color: #333;">tv_kind</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="1233" style="width: 35px; color: rgba(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="1251" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1251
</td>
<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">
<pre style="margin: 0;">+<span id="LC1251" class="line" lang="haskell"></span>
</pre>
</td>
</tr>
<tr class="line_holder new" id="" style="line-height: 1.6;">
<td class="diff-line-num new old_line" data-linenumber="1233" style="width: 35px; color: rgba(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="1252" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1252
</td>
<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">
<pre style="margin: 0;">+<span id="LC1252" 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>
</td>
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<td class="diff-line-num new old_line" data-linenumber="1233" style="width: 35px; color: rgba(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="1253" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1253
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<pre style="margin: 0;">+<span id="LC1253" class="line" lang="haskell">           <span class="p">;</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">tcTyVarLevel</span> <span class="n" style="color: #333;">tv</span> <span class="p">`</span><span class="n" style="color: #333;">strictlyDeeperThan</span><span class="p">`</span> <span class="n" style="color: #333;">cur_lvl</span> <span class="o" style="font-weight: 600;">&&</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="1233" style="width: 35px; color: rgba(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="1254" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1254
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<pre style="margin: 0;">+<span id="LC1254" class="line" lang="haskell">                   <span class="c1" style="color: #998; font-style: italic;">-- this tyvar is from an outer context: see Wrinkle</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="1233" style="width: 35px; color: rgba(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="1255" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1255
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<pre style="margin: 0;">+<span id="LC1255" class="line" lang="haskell">                   <span class="c1" style="color: #998; font-style: italic;">-- in Note [Naughty quantification candidates]</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="1233" style="width: 35px; color: rgba(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="1256" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1256
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<pre style="margin: 0;">+<span id="LC1256" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="1233" style="width: 35px; color: rgba(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="1257" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1257
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<pre style="margin: 0;">+<span id="LC1257" class="line" lang="haskell">                <span class="n" style="color: #333;">intersectsVarSet</span> <span class="n" style="color: #333;">bound</span> <span class="p">(</span><span class="n" style="color: #333;">tyCoVarsOfType</span> <span class="n" style="color: #333;">tv_kind</span><span class="p">)</span></span>
</pre>
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1233
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<td class="diff-line-num new_line" data-linenumber="1258" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1258
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<pre style="margin: 0;"> <span id="LC1258" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="1234" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1234
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<td class="diff-line-num new_line" data-linenumber="1259" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1259
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<pre style="margin: 0;"> <span id="LC1259" class="line" lang="haskell">             <span class="kr" style="font-weight: 600;">then</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Naughty quantification candidates]</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="1235" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1235
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<td class="diff-line-num new_line" data-linenumber="1260" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1260
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<pre style="margin: 0;"> <span id="LC1260" class="line" lang="haskell">                  <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;">"Zapping naughty quantifier"</span> <span class="p">(</span><span class="n" style="color: #333;">pprTyVar</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span></span>
</pre>
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<li id="2799ba786adc98d485fad6003334b913a0069bdc">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/19ab32c5fb3ebd88927b94acf6b348facc1552a2#2799ba786adc98d485fad6003334b913a0069bdc"><strong>compiler/typecheck/TcRnDriver.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2427" style="width: 35px; color: rgba(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="2427" style="width: 35px; color: rgba(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">@@ -2427,12 +2427,13 @@ tcRnType hsc_env normalise rdr_type</td>
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2427
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<pre style="margin: 0;"> <span id="LC2427" class="line" lang="haskell">        <span class="c1" style="color: #998; font-style: italic;">-- It can have any rank or kind</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="2428" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2428
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<td class="diff-line-num new_line" data-linenumber="2428" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2428
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<pre style="margin: 0;"> <span id="LC2428" class="line" lang="haskell">        <span class="c1" style="color: #998; font-style: italic;">-- First bring into scope any wildcards</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="2429" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2429
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<td class="diff-line-num new_line" data-linenumber="2429" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2429
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<pre style="margin: 0;"> <span id="LC2429" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tcRnType"</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">wcs</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">rn_type</span><span class="p">])</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2430" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2430
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<td class="diff-line-num new_line old" data-linenumber="2430" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2430" class="line" lang="haskell">       <span class="p">;</span> <span class="p">((</span><span class="n" style="color: #333;">ty</span><span class="p">,</span> <span class="n" style="color: #333;">kind</span><span class="p">),</span> <span class="n" style="color: #333;">lie</span><span class="p">)</span>  <span class="o" style="font-weight: 600;"><-</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2431" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2431
</td>
<td class="diff-line-num new_line old" data-linenumber="2430" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2431" class="line" lang="haskell">                       <span class="n" style="color: #333;">captureConstraints</span> <span class="o" style="font-weight: 600;">$</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="2432" style="width: 35px; color: rgba(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="2430" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2430
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<pre style="margin: 0;">+<span id="LC2430" class="line" lang="haskell">       <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">ty</span><span class="p">,</span> <span class="n" style="color: #333;">kind</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pushTcLevelM_</span>         <span class="o" style="font-weight: 600;">$</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="2432" style="width: 35px; color: rgba(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="2431" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2431
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<pre style="margin: 0;">+<span id="LC2431" class="line" lang="haskell">                        <span class="c1" style="color: #998; font-style: italic;">-- must push level to satisfy level precondition of</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="2432" style="width: 35px; color: rgba(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="2432" style="width: 35px; color: rgba(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="LC2432" class="line" lang="haskell">                        <span class="c1" style="color: #998; font-style: italic;">-- kindGeneralize, below</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="2432" style="width: 35px; color: rgba(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="2433" style="width: 35px; color: rgba(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="LC2433" class="line" lang="haskell">                       <span class="n" style="color: #333;">solveEqualities</span>       <span class="o" style="font-weight: 600;">$</span></span>
</pre>
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2432
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2434
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<pre style="margin: 0;"> <span id="LC2434" class="line" lang="haskell">                       <span class="n" style="color: #333;">tcWildCardBinders</span> <span class="n" style="color: #333;">wcs</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">wcs'</span> <span class="o" style="font-weight: 600;">-></span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="2433" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2433
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<td class="diff-line-num new_line" data-linenumber="2435" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2435
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<pre style="margin: 0;"> <span id="LC2435" class="line" lang="haskell">                       <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">emitWildCardHoleConstraints</span> <span class="n" style="color: #333;">wcs'</span></span>
</pre>
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2434
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<td class="diff-line-num new_line" data-linenumber="2436" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2436
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<pre style="margin: 0;"> <span id="LC2436" class="line" lang="haskell">                          <span class="p">;</span> <span class="n" style="color: #333;">tcLHsTypeUnsaturated</span> <span class="n" style="color: #333;">rn_type</span> <span class="p">}</span></span>
</pre>
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2435
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<td class="diff-line-num new_line old" data-linenumber="2437" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2435" class="line" lang="haskell">       <span class="p">;</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkNoErrs</span> <span class="p">(</span><span class="n" style="color: #333;">simplifyInteractive</span> <span class="n" style="color: #333;">lie</span><span class="p">)</span></span>
</pre>
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2436
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2437
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<pre style="margin: 0;"> <span id="LC2437" class="line" lang="haskell"></span>
</pre>
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2437
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<td class="diff-line-num new_line" data-linenumber="2438" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2438
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<pre style="margin: 0;"> <span id="LC2438" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- Do kind generalisation; see Note [Kind-generalise in tcRnType]</span></span>
</pre>
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2438
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2439
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<pre style="margin: 0;"> <span id="LC2439" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">kind</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkTcType</span> <span class="n" style="color: #333;">kind</span></span>
</pre>
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<br>
</li>
<li id="d2ddf5ce2d076f8584d9825af8ea0d7ea0a38813">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/19ab32c5fb3ebd88927b94acf6b348facc1552a2#d2ddf5ce2d076f8584d9825af8ea0d7ea0a38813"><strong>compiler/typecheck/TcRnTypes.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2095" style="width: 35px; color: rgba(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="2095" style="width: 35px; color: rgba(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">@@ -2095,6 +2095,16 @@ see dropDerivedWC.  For example</td>
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2095
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2095
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<pre style="margin: 0;"> <span id="LC2095" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   [D] Int ~ Bool, and we don't want to report that because it's</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="2096" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2096
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<td class="diff-line-num new_line" data-linenumber="2096" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2096
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<pre style="margin: 0;"> <span id="LC2096" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   incomprehensible. That is why we don't rewrite wanteds with wanteds!</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="2097" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2097
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<td class="diff-line-num new_line" data-linenumber="2097" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2097
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<pre style="margin: 0;"> <span id="LC2097" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="2098" style="width: 35px; color: rgba(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="2098" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2098
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<pre style="margin: 0;">+<span id="LC2098" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * We might float out some Wanteds from an implication, leaving behind</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="2098" style="width: 35px; color: rgba(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="2099" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2099
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<pre style="margin: 0;">+<span id="LC2099" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   their insoluble Deriveds. For example:</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="2098" style="width: 35px; color: rgba(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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2100
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<pre style="margin: 0;">+<span id="LC2100" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="2098" style="width: 35px; color: rgba(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="2101" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2101
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<pre style="margin: 0;">+<span id="LC2101" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   forall a[2]. [W] alpha[1] ~ Int</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="2098" style="width: 35px; color: rgba(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="2102" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2102
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<pre style="margin: 0;">+<span id="LC2102" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">                [W] alpha[1] ~ Bool</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="2098" style="width: 35px; color: rgba(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="2103" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2103
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<pre style="margin: 0;">+<span id="LC2103" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">                [D] Int ~ Bool</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="2104" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2104
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<pre style="margin: 0;">+<span id="LC2104" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="2098" style="width: 35px; color: rgba(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="2105" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2105
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<pre style="margin: 0;">+<span id="LC2105" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   The Derived is insoluble, but we very much want to drop it when floating</span></span>
</pre>
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2106
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<pre style="margin: 0;">+<span id="LC2106" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   out.</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="2107" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2107
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<pre style="margin: 0;">+<span id="LC2107" class="line" lang="haskell"></span>
</pre>
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2098
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<td class="diff-line-num new_line" data-linenumber="2108" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2108
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<pre style="margin: 0;"> <span id="LC2108" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">But (tiresomely) we do keep *some* Derived constraints:</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="2099" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2099
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<td class="diff-line-num new_line" data-linenumber="2109" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2109
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<pre style="margin: 0;"> <span id="LC2109" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="2100" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2100
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<td class="diff-line-num new_line" data-linenumber="2110" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2110
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<pre style="margin: 0;"> <span id="LC2110" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Type holes are derived constraints, because they have no evidence</span></span>
</pre>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2103" style="width: 35px; color: rgba(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="2113" style="width: 35px; color: rgba(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">@@ -2103,8 +2113,7 @@ But (tiresomely) we do keep *some* Derived constraints:</td>
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2103
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<td class="diff-line-num new_line" data-linenumber="2113" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2113
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<pre style="margin: 0;"> <span id="LC2113" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Insoluble kind equalities (e.g. [D] * ~ (* -> *)), with</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="2104" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2104
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<td class="diff-line-num new_line" data-linenumber="2114" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2114
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<pre style="margin: 0;"> <span id="LC2114" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   KindEqOrigin, may arise from a type equality a ~ Int#, say.  See</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="2105" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2105
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<td class="diff-line-num new_line" data-linenumber="2115" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2115
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<pre style="margin: 0;"> <span id="LC2115" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   Note [Equalities with incompatible kinds] in TcCanonical.</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2106" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2106
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<td class="diff-line-num new_line old" data-linenumber="2116" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2106" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   These need to be kept because the kind equalities might have different</span></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2107" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2107
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<td class="diff-line-num new_line old" data-linenumber="2116" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC2107" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   source locations and hence different error messages.</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="2108" style="width: 35px; color: rgba(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="2116" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2116
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<pre style="margin: 0;">+<span id="LC2116" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   Keeping these around produces better error messages, in practice.</span></span>
</pre>
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2108
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<td class="diff-line-num new_line" data-linenumber="2117" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2117
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<pre style="margin: 0;"> <span id="LC2117" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   E.g., test case dependent/should_fail/T11471</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="2109" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2109
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<td class="diff-line-num new_line" data-linenumber="2118" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2118
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<pre style="margin: 0;"> <span id="LC2118" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="2110" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2110
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<td class="diff-line-num new_line" data-linenumber="2119" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2119
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<pre style="margin: 0;"> <span id="LC2119" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * We keep most derived equalities arising from functional dependencies</span></span>
</pre>
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</li>
<li id="75d517f701402b106e4d98d255eb24b57ba72aab">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/19ab32c5fb3ebd88927b94acf6b348facc1552a2#75d517f701402b106e4d98d255eb24b57ba72aab"><strong>compiler/typecheck/TcSimplify.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="152" style="width: 35px; color: rgba(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="152" style="width: 35px; color: rgba(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">@@ -152,8 +152,26 @@ solveLocalEqualities :: String -> TcM a -> TcM a</td>
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152
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<td class="diff-line-num new_line" data-linenumber="152" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
152
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<pre style="margin: 0;"> <span id="LC152" class="line" lang="haskell"><span class="n" style="color: #333;">solveLocalEqualities</span> <span class="n" style="color: #333;">callsite</span> <span class="n" style="color: #333;">thing_inside</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="153" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
153
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<td class="diff-line-num new_line" data-linenumber="153" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
153
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<pre style="margin: 0;"> <span id="LC153" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">wanted</span><span class="p">,</span> <span class="n" style="color: #333;">res</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">solveLocalEqualitiesX</span> <span class="n" style="color: #333;">callsite</span> <span class="n" style="color: #333;">thing_inside</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="154" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
154
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<td class="diff-line-num new_line" data-linenumber="154" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
154
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<pre style="margin: 0;"> <span id="LC154" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">emitConstraints</span> <span class="n" style="color: #333;">wanted</span></span>
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<td class="diff-line-num new old_line" data-linenumber="155" style="width: 35px; color: rgba(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="LC155" class="line" lang="haskell"></span>
</pre>
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<pre style="margin: 0;">+<span id="LC156" class="line" lang="haskell">       <span class="c1" style="color: #998; font-style: italic;">-- See Note [Fail fast if there are insoluble kind equalities]</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC157" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">insolubleWC</span> <span class="n" style="color: #333;">wanted</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="LC158" class="line" lang="haskell">           <span class="n" style="color: #333;">failM</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC159" class="line" lang="haskell"></span>
</pre>
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<pre style="margin: 0;"> <span id="LC160" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">res</span> <span class="p">}</span></span>
</pre>
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161
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<pre style="margin: 0;"> <span id="LC161" class="line" lang="haskell"></span>
</pre>
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<pre style="margin: 0;">+<span id="LC162" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Fail fast if there are insoluble kind equalities]</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC163" 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="LC164" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Rather like in simplifyInfer, fail fast if there is an insoluble</span></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="165" style="width: 35px; color: rgba(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="LC165" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">constraint.  Otherwise we'll just succeed in kind-checking a nonsense</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC166" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">type, with a cascade of follow-up errors.</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC167" class="line" lang="haskell"></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;">For example polykinds/T12593, T15577, and many others.</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC169" class="line" lang="haskell"></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;">Take care to ensure that you emit the insoluble constraints before</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC171" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">failing, because they are what will ulimately lead to the error</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;">messsage!</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC173" 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="LC174" class="line" lang="haskell"></span>
</pre>
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<pre style="margin: 0;"> <span id="LC175" class="line" lang="haskell"><span class="n" style="color: #333;">solveLocalEqualitiesX</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">String</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">WantedConstraints</span><span class="p">,</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
</pre>
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158
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176
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<pre style="margin: 0;"> <span id="LC176" class="line" lang="haskell"><span class="n" style="color: #333;">solveLocalEqualitiesX</span> <span class="n" style="color: #333;">callsite</span> <span class="n" style="color: #333;">thing_inside</span></span>
</pre>
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159
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<td class="diff-line-num new_line" data-linenumber="177" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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="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;">"solveLocalEqualitiesX {"</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Called from"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="n" style="color: #333;">callsite</span> <span class="p">])</span></span>
</pre>
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<br>
</li>
<li id="bdfa0cc139f61d1236abc1598c5d684b43c357f9">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/19ab32c5fb3ebd88927b94acf6b348facc1552a2#bdfa0cc139f61d1236abc1598c5d684b43c357f9"><strong>compiler/typecheck/TcTyClsDecls.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1038" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1038" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1038,9 +1038,11 @@ kcTyClDecl (ClassDecl { tcdLName = (dL->L _ name)</td>
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<td class="diff-line-num old_line" data-linenumber="1038" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1038
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<td class="diff-line-num new_line" data-linenumber="1038" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1038
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<pre style="margin: 0;"> <span id="LC1038" class="line" lang="haskell">    <span class="kr" style="font-weight: 600;">do</span>  <span class="p">{</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcHsContext</span> <span class="n" style="color: #333;">ctxt</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="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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<pre style="margin: 0;"> <span id="LC1039" class="line" lang="haskell">        <span class="p">;</span> <span class="n" style="color: #333;">mapM_</span> <span class="p">(</span><span class="n" style="color: #333;">wrapLocM_</span> <span class="n" style="color: #333;">kc_sig</span><span class="p">)</span> <span class="n" style="color: #333;">sigs</span> <span class="p">}</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="1040" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1040
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<td class="diff-line-num new_line" data-linenumber="1040" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1040
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<pre style="margin: 0;"> <span id="LC1040" 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="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="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">
 
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<pre style="margin: 0;">-<span id="LC1041" class="line" lang="haskell">    <span class="n" style="color: #333;">kc_sig</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ClassOpSig</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">nms</span> <span class="n" style="color: #333;">op_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">kc<span class="idiff left right">HsSigType</span></span> <span class="n" style="color: #333;">nms</span> <span class="n" style="color: #333;">op_ty</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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1041
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<pre style="margin: 0;">+<span id="LC1041" class="line" lang="haskell">    <span class="n" style="color: #333;">kc_sig</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ClassOpSig</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">nms</span> <span class="n" style="color: #333;">op_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">kc<span class="idiff left">ClassSigType</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">skol_info</span></span> <span class="n" style="color: #333;">nms</span> <span class="n" style="color: #333;">op_ty</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="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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<pre style="margin: 0;"> <span id="LC1042" class="line" lang="haskell">    <span class="n" style="color: #333;">kc_sig</span> <span class="kr" style="font-weight: 600;">_</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>
</pre>
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<td class="diff-line-num old_line" data-linenumber="1043" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1043
</td>
<td class="diff-line-num new_line" data-linenumber="1043" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1043
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<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC1043" class="line" lang="haskell"></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="1044" style="width: 35px; color: rgba(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="1044" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1044
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<pre style="margin: 0;">+<span id="LC1044" class="line" lang="haskell">    <span class="n" style="color: #333;">skol_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TyConSkol</span> <span class="kt" style="color: #458; font-weight: 600;">ClassFlavour</span> <span class="n" style="color: #333;">name</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="1044" style="width: 35px; color: rgba(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="1045" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1045
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<pre style="margin: 0;">+<span id="LC1045" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="1044" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1044
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<td class="diff-line-num new_line" data-linenumber="1046" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1046
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<pre style="margin: 0;"> <span id="LC1046" class="line" lang="haskell"><span class="n" style="color: #333;">kcTyClDecl</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FamDecl</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FamilyDecl</span> <span class="p">{</span> <span class="n" style="color: #333;">fdLName</span>  <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">dL</span><span class="o" style="font-weight: 600;">-></span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">fam_tc_name</span><span class="p">)</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="1045" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1045
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<td class="diff-line-num new_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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<pre style="margin: 0;"> <span id="LC1047" class="line" lang="haskell">                                  <span class="p">,</span> <span class="n" style="color: #333;">fdInfo</span>   <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fd_info</span> <span class="p">}))</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="1046" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
1046
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<td class="diff-line-num new_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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<pre style="margin: 0;"> <span id="LC1048" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- closed type families look at their equations, but other families don't</span></span>
</pre>
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</li>
<li id="341fd962c5f2c9fcf8be3dbdaa9a14ee1538af07">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/19ab32c5fb3ebd88927b94acf6b348facc1552a2#341fd962c5f2c9fcf8be3dbdaa9a14ee1538af07"><strong>compiler/typecheck/TcType.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">@@ -516,6 +516,17 @@ superSkolemTv   = SkolemTv topTcLevel True   -- Treat this as a completely disti</td>
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<pre style="margin: 0;"> <span id="LC516" class="line" lang="haskell">                  <span class="c1" style="color: #998; font-style: italic;">-- The choice of level number here is a bit dodgy, but</span></span>
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<pre style="margin: 0;"> <span id="LC517" class="line" lang="haskell">                  <span class="c1" style="color: #998; font-style: italic;">-- topTcLevel works in the places that vanillaSkolemTv is used</span></span>
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<pre style="margin: 0;"> <span id="LC518" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC519" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVarDetails</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC520" class="line" lang="haskell">  <span class="n" style="color: #333;">ppr</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprTcTyVarDetails</span></span>
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<pre style="margin: 0;">+<span id="LC521" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC522" class="line" lang="haskell"><span class="n" style="color: #333;">pprTcTyVarDetails</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVarDetails</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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<pre style="margin: 0;">+<span id="LC523" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- For debugging</span></span>
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<pre style="margin: 0;">+<span id="LC524" class="line" lang="haskell"><span class="n" style="color: #333;">pprTcTyVarDetails</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RuntimeUnk</span> <span class="p">{})</span>      <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"rt"</span></span>
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<pre style="margin: 0;">+<span id="LC525" class="line" lang="haskell"><span class="n" style="color: #333;">pprTcTyVarDetails</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SkolemTv</span> <span class="n" style="color: #333;">lvl</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">)</span>  <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"ssk"</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;">lvl</span></span>
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<pre style="margin: 0;">+<span id="LC526" class="line" lang="haskell"><span class="n" style="color: #333;">pprTcTyVarDetails</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SkolemTv</span> <span class="n" style="color: #333;">lvl</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"sk"</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;">lvl</span></span>
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<pre style="margin: 0;">+<span id="LC527" class="line" lang="haskell"><span class="n" style="color: #333;">pprTcTyVarDetails</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MetaTv</span> <span class="p">{</span> <span class="n" style="color: #333;">mtv_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">info</span><span class="p">,</span> <span class="n" style="color: #333;">mtv_tclvl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tclvl</span> <span class="p">})</span></span>
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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="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">info</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;">tclvl</span></span>
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<pre style="margin: 0;">+<span id="LC529" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC530" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-----------------------------</span></span>
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<pre style="margin: 0;"> <span id="LC531" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">MetaDetails</span></span>
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<pre style="margin: 0;"> <span id="LC532" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Flexi</span>  <span class="c1" style="color: #998; font-style: italic;">-- Flexi type variables unify to become Indirects</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">@@ -544,20 +555,11 @@ instance Outputable MetaDetails where</td>
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<pre style="margin: 0;"> <span id="LC555" class="line" lang="haskell">  <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">Flexi</span>         <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Flexi"</span></span>
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<pre style="margin: 0;"> <span id="LC556" 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;">Indirect</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;">text</span> <span class="s" style="color: #d14;">"Indirect"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;"> <span id="LC557" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC547" class="line" lang="haskell"><span class="n" style="color: #333;">pprTcTyVarDetails</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVarDetails</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span></span>
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<pre style="margin: 0;">-<span id="LC548" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- For debugging</span></span>
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<pre style="margin: 0;">-<span id="LC549" class="line" lang="haskell"><span class="n" style="color: #333;">pprTcTyVarDetails</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">RuntimeUnk</span> <span class="p">{})</span>      <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"rt"</span></span>
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<pre style="margin: 0;">-<span id="LC550" class="line" lang="haskell"><span class="n" style="color: #333;">pprTcTyVarDetails</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SkolemTv</span> <span class="n" style="color: #333;">lvl</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">)</span>  <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"ssk"</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;">lvl</span></span>
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<pre style="margin: 0;">-<span id="LC551" class="line" lang="haskell"><span class="n" style="color: #333;">pprTcTyVarDetails</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">SkolemTv</span> <span class="n" style="color: #333;">lvl</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"sk"</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;">lvl</span></span>
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<pre style="margin: 0;">-<span id="LC552" class="line" lang="haskell"><span class="n" style="color: #333;">pprTcTyVarDetails</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MetaTv</span> <span class="p">{</span> <span class="n" style="color: #333;">mtv_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">info</span><span class="p">,</span> <span class="n" style="color: #333;">mtv_tclvl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tclvl</span> <span class="p">})</span></span>
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<pre style="margin: 0;">-<span id="LC553" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pp_info</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;">tclvl</span></span>
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<pre style="margin: 0;">-<span id="LC554" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC555" class="line" lang="haskell">    <span class="n" style="color: #333;">pp_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">info</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC556" class="line" lang="haskell">                <span class="kt" style="color: #458; font-weight: 600;">TauTv</span>      <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"tau"</span></span>
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<td class="diff-line-num new_line old" 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="LC557" class="line" lang="haskell">                <span class="kt" style="color: #458; font-weight: 600;">TyVarTv</span>    <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"tyv"</span></span>
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<pre style="margin: 0;">-<span id="LC558" class="line" lang="haskell">                <span class="kt" style="color: #458; font-weight: 600;">FlatMetaTv</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"fmv"</span></span>
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<pre style="margin: 0;">-<span id="LC559" class="line" lang="haskell">                <span class="kt" style="color: #458; font-weight: 600;">FlatSkolTv</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"fsk"</span></span>
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560
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<td class="diff-line-num new_line old" 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="LC560" class="line" lang="haskell"></span>
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<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="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">MetaInfo</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<td class="diff-line-num new old_line" data-linenumber="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">
 
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<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="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">TauTv</span>         <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"tau"</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="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">TyVarTv</span>       <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"tyv"</span></span>
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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;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">FlatMetaTv</span>    <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"fmv"</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;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">FlatSkolTv</span>    <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"fsk"</span></span>
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561
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563
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<pre style="margin: 0;"> <span id="LC563" class="line" lang="haskell"></span>
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562
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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;">{- *********************************************************************</span></span>
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563
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<pre style="margin: 0;"> <span id="LC565" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">*                                                                      *</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="795" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="797" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -795,10 +797,10 @@ checkTcLevelInvariant :: TcLevel -> TcLevel -> Bool</td>
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<pre style="margin: 0;"> <span id="LC797" class="line" lang="haskell"><span class="n" style="color: #333;">checkTcLevelInvariant</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcLevel</span> <span class="n" style="color: #333;">ctxt_tclvl</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcLevel</span> <span class="n" style="color: #333;">tv_tclvl</span><span class="p">)</span></span>
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796
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<td class="diff-line-num new_line" data-linenumber="798" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC798" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ctxt_tclvl</span> <span class="o" style="font-weight: 600;">>=</span> <span class="n" style="color: #333;">tv_tclvl</span></span>
</pre>
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<pre style="margin: 0;"> <span id="LC799" class="line" lang="haskell"></span>
</pre>
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<pre style="margin: 0;">+<span id="LC800" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returns topTcLevel for non-TcTyVars</span></span>
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798
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<td class="diff-line-num new_line" data-linenumber="801" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
801
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<pre style="margin: 0;"> <span id="LC801" class="line" lang="haskell"><span class="n" style="color: #333;">tcTyVarLevel</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcLevel</span></span>
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799
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<td class="diff-line-num new_line" data-linenumber="802" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
802
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<pre style="margin: 0;"> <span id="LC802" class="line" lang="haskell"><span class="n" style="color: #333;">tcTyVarLevel</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="800" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
800
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<td class="diff-line-num new_line old" data-linenumber="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">
 
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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="kt" style="color: #458; font-weight: 600;">ASSERT2</span><span class="p">(</span> <span class="n" style="color: #333;">tcIsTcTyVar</span> <span class="n" style="color: #333;">tv</span><span class="p">,</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">tv</span> <span class="p">)</span></span>
</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="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">
 
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<pre style="margin: 0;">-<span id="LC801" class="line" lang="haskell">    <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">tcTyVarDetails</span> <span class="n" style="color: #333;">tv</span> <span class="kr" style="font-weight: 600;">of</span></span>
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803
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<pre style="margin: 0;">+<span id="LC803" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">tcTyVarDetails</span> <span class="n" style="color: #333;">tv</span> <span class="kr" style="font-weight: 600;">of</span></span>
</pre>
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802
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<td class="diff-line-num new_line" data-linenumber="804" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
804
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<pre style="margin: 0;"> <span id="LC804" class="line" lang="haskell">          <span class="kt" style="color: #458; font-weight: 600;">MetaTv</span> <span class="p">{</span> <span class="n" style="color: #333;">mtv_tclvl</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tv_lvl</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">tv_lvl</span></span>
</pre>
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803
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<td class="diff-line-num new_line" data-linenumber="805" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
805
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<pre style="margin: 0;"> <span id="LC805" class="line" lang="haskell">          <span class="kt" style="color: #458; font-weight: 600;">SkolemTv</span> <span class="n" style="color: #333;">tv_lvl</span> <span class="kr" style="font-weight: 600;">_</span>             <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">tv_lvl</span></span>
</pre>
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804
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<td class="diff-line-num new_line" data-linenumber="806" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
806
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<pre style="margin: 0;"> <span id="LC806" class="line" lang="haskell">          <span class="kt" style="color: #458; font-weight: 600;">RuntimeUnk</span>                    <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">topTcLevel</span></span>
</pre>
</td>
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</table>
<br>
</li>
<li id="13b8cf7619096f55d161ef6f6892fd8b6399f187">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/19ab32c5fb3ebd88927b94acf6b348facc1552a2#13b8cf7619096f55d161ef6f6892fd8b6399f187"><strong>testsuite/tests/ghci/scripts/T16767.script</strong></a>
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1
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">:set -fprint-explicit-foralls -fprint-explicit-kinds -XTypeApplications -XDataKinds</span>
</pre>
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2
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">import Data.Proxy</span>
</pre>
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3
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext">:kind! 'Proxy @_</span></pre>
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<br>
</li>
<li id="8c9b98ada81eb0b5ce37764a0ca63adffb8549d6">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/19ab32c5fb3ebd88927b94acf6b348facc1552a2#8c9b98ada81eb0b5ce37764a0ca63adffb8549d6"><strong>testsuite/tests/ghci/scripts/T16767.stdout</strong></a>
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1
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">'Proxy @_ :: forall {k} {_ :: k}. Proxy @{k} _</span>
</pre>
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2
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">= 'Proxy @{k} @_</span></pre>
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</table>
<br>
</li>
<li id="080fb38cc741d3f1a476696b3373ab7cf48c2aaa">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/19ab32c5fb3ebd88927b94acf6b348facc1552a2#080fb38cc741d3f1a476696b3373ab7cf48c2aaa"><strong>testsuite/tests/ghci/scripts/all.T</strong></a>
<hr>
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<tr class="line_holder match" id="" style="line-height: 1.6;">
<td class="diff-line-num unfold js-unfold old_line" data-linenumber="296" style="width: 35px; color: rgba(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="296" style="width: 35px; color: rgba(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">@@ -296,3 +296,4 @@ test('T16030', normal, ghci_script, ['T16030.script'])</td>
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296
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296
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<pre style="margin: 0;"> <span id="LC296" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'T11606'</span><span class="p">,</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">ghci_script</span><span class="p">,</span> <span class="p">[</span><span class="s" style="color: #d14;">'T11606.script'</span><span class="p">])</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="297" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
297
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<td class="diff-line-num new_line" data-linenumber="297" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
297
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<pre style="margin: 0;"> <span id="LC297" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'T16089'</span><span class="p">,</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">ghci_script</span><span class="p">,</span> <span class="p">[</span><span class="s" style="color: #d14;">'T16089.script'</span><span class="p">])</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="298" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
298
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<td class="diff-line-num new_line" data-linenumber="298" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
298
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<pre style="margin: 0;"> <span id="LC298" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'T16527'</span><span class="p">,</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">ghci_script</span><span class="p">,</span> <span class="p">[</span><span class="s" style="color: #d14;">'T16527.script'</span><span class="p">])</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="299" style="width: 35px; color: rgba(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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299
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<pre style="margin: 0;">+<span id="LC299" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'T16767'</span><span class="p">,</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">ghci_script</span><span class="p">,</span> <span class="p">[</span><span class="s" style="color: #d14;">'T16767.script'</span><span class="p">])</span></span></pre>
</td>
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</li>
<li id="f80799ecc01331b244dad18a881729fbb1f7bfb5">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/19ab32c5fb3ebd88927b94acf6b348facc1552a2#f80799ecc01331b244dad18a881729fbb1f7bfb5"><strong>testsuite/tests/typecheck/should_fail/T16517.hs</strong></a>
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<td class="diff-line-num new new_line" data-linenumber="1" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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 PolyKinds #-}</span></span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="0" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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<td class="diff-line-num new new_line" data-linenumber="2" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2
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<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;">T16517</span> <span class="kr" style="font-weight: 600;">where</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Proxy</span></span>
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5
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="n" style="color: #333;">a</span> <span class="kr" style="font-weight: 600;">where</span> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Proxy</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">k</span><span class="p">)</span></span></pre>
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<li id="5a9a1ea6f14d9aad857ca084d18ff53bec57a93b">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/19ab32c5fb3ebd88927b94acf6b348facc1552a2#5a9a1ea6f14d9aad857ca084d18ff53bec57a93b"><strong>testsuite/tests/typecheck/should_fail/T16517.stderr</strong></a>
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1
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T16517.hs:5:29: error:</span>
</pre>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext">    • Expected kind ‘k’, but ‘a’ has kind ‘k0’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext">    • In the first argument of ‘Proxy’, namely ‘(a :: k)’</span>
</pre>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext">      In the type signature: m :: Proxy (a :: k)</span>
</pre>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext">      In the class declaration for ‘C’</span></pre>
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<li id="b9e86d897a62509b0114d81d5e736630d6f68f43">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/19ab32c5fb3ebd88927b94acf6b348facc1552a2#b9e86d897a62509b0114d81d5e736630d6f68f43"><strong>testsuite/tests/typecheck/should_fail/all.T</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="511" style="width: 35px; color: rgba(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="511" style="width: 35px; color: rgba(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">@@ -511,3 +511,4 @@ test('T16059e', [extra_files(['T16059b.hs'])], multimod_compile_fail,</td>
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<pre style="margin: 0;"> <span id="LC511" class="line" lang="perl"><span class="s" style="color: #d14;">    ['</span><span class="nv" style="color: #008080;">T16059e</span><span class="s" style="color: #d14;">', '</span><span class="o" style="font-weight: 600;">-</span><span class="nv" style="color: #008080;">v0</span><span class="s" style="color: #d14;">'])</span></span>
</pre>
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512
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<pre style="margin: 0;"> <span id="LC512" class="line" lang="perl"><span class="s" style="color: #d14;">test('</span><span class="nv" style="color: #008080;">T16255</span><span class="s" style="color: #d14;">', normal, compile_fail, [''])</span></span>
</pre>
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513
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<pre style="margin: 0;"> <span id="LC513" class="line" lang="perl"><span class="s" style="color: #d14;">test('</span><span class="nv" style="color: #008080;">T16204c</span><span class="s" style="color: #d14;">', normal, compile_fail, [''])</span></span>
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<pre style="margin: 0;">+<span id="LC514" class="line" lang="perl"><span class="s" style="color: #d14;">test('</span><span class="nv" style="color: #008080;">T16517</span><span class="s" style="color: #d14;">', normal, compile_fail, ['</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">'</span><span class="p">])</span></span></pre>
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<li id="336d4b3eabb2680482261a40f3a870ff666a17b8">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/19ab32c5fb3ebd88927b94acf6b348facc1552a2#336d4b3eabb2680482261a40f3a870ff666a17b8"><strong>testsuite/tests/typecheck/should_fail/tcfail134.stderr</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2,6 +2,5 @@</td>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">tcfail134.hs:5:33: error:</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext">    • Expecting one more argument to ‘XML’</span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext">      Expected a type, but ‘XML’ has kind ‘* -> Constraint’</span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext">    • In the type signature:</span>
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<td class="diff-line-num old old_line" data-linenumber="6" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
6
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<td class="diff-line-num new_line old" data-linenumber="5" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext">        toXML :: a -> XML</span>
</pre>
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<td class="diff-line-num new old_line" data-linenumber="7" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
 
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<td class="diff-line-num new new_line" data-linenumber="5" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
5
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<td class="line_content new" style="padding-left: 0.5em; padding-right: 0.5em;" bgcolor="#ecfdf0">
<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext">    • In the type signature: toXML :: a -> XML</span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="7" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
7
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<td class="diff-line-num new_line" data-linenumber="6" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
6
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext">      In the class declaration for ‘XML’</span></pre>
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