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<h3>
Marge Bot pushed to branch master
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/a22e51ea6f7a046c87d57ce30d143eef6abee9ff">a22e51ea</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2019-06-09T22:43:38Z</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
</pre>
</li>
</ul>
<h4>16 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#9f8e9eab0dc8b12ae9f92fbb76ddca15c817667a">
compiler/typecheck/TcCanonical.hs
</a>
</li>
<li class="file-stats">
<a href="#c573dfc3158e7ec41ecc0965becd5f1e6e92a2e6">
compiler/typecheck/TcErrors.hs
</a>
</li>
<li class="file-stats">
<a href="#350c4076427c611b8f14e875a4ca553041c2b847">
compiler/typecheck/TcHsType.hs
</a>
</li>
<li class="file-stats">
<a href="#367db94fc37c8c7548dbe545a5302c7a5108e41e">
compiler/typecheck/TcMType.hs
</a>
</li>
<li class="file-stats">
<a href="#2799ba786adc98d485fad6003334b913a0069bdc">
compiler/typecheck/TcRnDriver.hs
</a>
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<li class="file-stats">
<a href="#d2ddf5ce2d076f8584d9825af8ea0d7ea0a38813">
compiler/typecheck/TcRnTypes.hs
</a>
</li>
<li class="file-stats">
<a href="#75d517f701402b106e4d98d255eb24b57ba72aab">
compiler/typecheck/TcSimplify.hs
</a>
</li>
<li class="file-stats">
<a href="#bdfa0cc139f61d1236abc1598c5d684b43c357f9">
compiler/typecheck/TcTyClsDecls.hs
</a>
</li>
<li class="file-stats">
<a href="#341fd962c5f2c9fcf8be3dbdaa9a14ee1538af07">
compiler/typecheck/TcType.hs
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</li>
<li class="file-stats">
<a href="#13b8cf7619096f55d161ef6f6892fd8b6399f187">
<span class="new-file">
+
testsuite/tests/ghci/scripts/T16767.script
</span>
</a>
</li>
<li class="file-stats">
<a href="#8c9b98ada81eb0b5ce37764a0ca63adffb8549d6">
<span class="new-file">
+
testsuite/tests/ghci/scripts/T16767.stdout
</span>
</a>
</li>
<li class="file-stats">
<a href="#080fb38cc741d3f1a476696b3373ab7cf48c2aaa">
testsuite/tests/ghci/scripts/all.T
</a>
</li>
<li class="file-stats">
<a href="#f80799ecc01331b244dad18a881729fbb1f7bfb5">
<span class="new-file">
+
testsuite/tests/typecheck/should_fail/T16517.hs
</span>
</a>
</li>
<li class="file-stats">
<a href="#5a9a1ea6f14d9aad857ca084d18ff53bec57a93b">
<span class="new-file">
+
testsuite/tests/typecheck/should_fail/T16517.stderr
</span>
</a>
</li>
<li class="file-stats">
<a href="#b9e86d897a62509b0114d81d5e736630d6f68f43">
testsuite/tests/typecheck/should_fail/all.T
</a>
</li>
<li class="file-stats">
<a href="#336d4b3eabb2680482261a40f3a870ff666a17b8">
testsuite/tests/typecheck/should_fail/tcfail134.stderr
</a>
</li>
</ul>
<h4>Changes:</h4>
<li id="9f8e9eab0dc8b12ae9f92fbb76ddca15c817667a">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/a22e51ea6f7a046c87d57ce30d143eef6abee9ff#9f8e9eab0dc8b12ae9f92fbb76ddca15c817667a"><strong>compiler/typecheck/TcCanonical.hs</strong></a>
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<td class="diff-line-num unfold js-unfold 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">...</td>
<td class="diff-line-num unfold js-unfold new_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">...</td>
<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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<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="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="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC2079" class="line" lang="haskell"></span>
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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="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="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<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>
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<td class="diff-line-num old_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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<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">
2081
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<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC2081" class="line" lang="haskell"></span>
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<td class="diff-line-num old old_line" data-linenumber="2082" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2082
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<td class="diff-line-num new_line old" data-linenumber="2082" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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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>
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<td class="diff-line-num old old_line" data-linenumber="2083" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2083
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<td class="diff-line-num new_line old" data-linenumber="2082" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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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>
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<td class="diff-line-num old old_line" data-linenumber="2084" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2084
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<td class="diff-line-num new_line old" data-linenumber="2082" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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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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<td class="diff-line-num old old_line" data-linenumber="2085" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2085
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<td class="diff-line-num new_line old" data-linenumber="2082" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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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>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2086" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2086
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<td class="diff-line-num new_line old" data-linenumber="2082" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC2086" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num old old_line" data-linenumber="2087" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2087
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<td class="diff-line-num new_line old" data-linenumber="2082" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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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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<td class="diff-line-num old old_line" data-linenumber="2088" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
2088
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<td class="diff-line-num new_line old" data-linenumber="2082" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC2088" class="line" lang="haskell"></span>
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<td class="diff-line-num old_line" data-linenumber="2089" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2089
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2082
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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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<td class="diff-line-num old_line" data-linenumber="2090" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2090
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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">
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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="diff-line-num old_line" data-linenumber="2091" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<td class="diff-line-num new_line" data-linenumber="2084" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2084
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<pre style="margin: 0;"> <span id="LC2084" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold 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">...</td>
<td class="diff-line-num unfold js-unfold 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">...</td>
<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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2109
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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="cm" style="color: #998; font-style: italic;">Note [Wanteds do not rewrite Wanteds] in TcRnTypes: note that the</span></span>
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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="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">
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>
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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"> The solution is then not to use `co` to "rewrite" -- that is, cas</span>t</span></span>
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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;"><span class="idiff left right"> -- `w`, but instead to keep `w` heterogeneous and</span></span></span>
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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;"><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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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;"><span class="idiff left right"> collect evidence for it, so `co` is born a Derived, with a CtOrigin</span></span></span>
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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;"><span class="idiff left right"> of KindEqOrigin.</span></span></span>
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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;"><span class="idiff left right">The solution is then not to use `co` to "rewrite" -- that is, cast -- `w`, bu</span>t</span></span>
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2106
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<pre style="margin: 0;">+<span id="LC2106" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">instead to keep `w` heterogeneous and irreducible. Given that we're not using</span></span></span>
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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>
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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>
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2109
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<pre style="margin: 0;">+<span id="LC2109" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">unification), the original wanted (`w`) will get kicked out. We thus get</span></span></span>
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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>
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2118
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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>
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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;"><span class="idiff left right">will get kicked out.</span></span></span>
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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>
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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>
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2120
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2113
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<pre style="margin: 0;"> <span id="LC2113" class="line" lang="haskell"></span>
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2121
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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>
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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;">trigger, because flattening would have rewritten k to Type. That is,</span></span>
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2123
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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>
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2124
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<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>
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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;">Note that the Wanted is unchanged and will be irreducible. This all happens</span></span>
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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>
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<pre style="margin: 0;">+<span id="LC2116" class="line" lang="haskell"></span>
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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>
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2118
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<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>
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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 have [G] co1 :: k ~ Type, then flattening the kind of alpha would</span></span>
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2120
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<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>
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2125
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2121
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<pre style="margin: 0;"> <span id="LC2121" class="line" lang="haskell"></span>
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2126
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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>
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2127
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2123
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<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>
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2128
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2124
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<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>
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2129
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2125
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<pre style="margin: 0;"> <span id="LC2125" class="line" lang="haskell"></span>
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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;">For Givens, this problem doesn't bite, so a heterogeneous Given gives</span></span>
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2126
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<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>
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2127
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<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>
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2131
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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>
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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;">the Given (see the "homo_co" in the Given case in canEqTyVar) and</span></span>
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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>
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2133
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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>
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2134
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2131
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<pre style="margin: 0;"> <span id="LC2131" class="line" lang="haskell"></span>
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2135
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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>
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2136
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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>
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2137
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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>
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2138
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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>
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2139
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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>
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2140
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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>
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2141
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<pre style="margin: 0;">-<span id="LC2141" class="line" lang="haskell"></span>
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2142
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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>
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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>
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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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<a href="https://gitlab.haskell.org/ghc/ghc/commit/a22e51ea6f7a046c87d57ce30d143eef6abee9ff#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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<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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<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>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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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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<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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<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>
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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>
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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>
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<pre style="margin: 0;">+<span id="LC175" class="line" lang="haskell"></span>
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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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<a href="https://gitlab.haskell.org/ghc/ghc/commit/a22e51ea6f7a046c87d57ce30d143eef6abee9ff#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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<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="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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<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;">discardResult</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC194" class="line" lang="haskell"> <span class="n" style="color: #333;">addSigCtxt</span> <span class="p">(</span><span class="n" style="color: #333;">funsSigCtxt</span> <span class="n" style="color: #333;">names</span><span class="p">)</span> <span class="n" style="color: #333;">hs_ty</span> <span class="o" style="font-weight: 600;">$</span></span>
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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>
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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>
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<pre style="margin: 0;">-<span id="LC197" class="line" lang="haskell"></span>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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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>
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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;">$</span></span>
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204
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<pre style="margin: 0;">-<span id="LC204" class="line" lang="haskell"> <span class="n" style="color: #333;">tc_hs_sig_type</span> <span class="n" style="color: #333;">skol_info</span> <span class="n" style="color: #333;">sig_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TheKind</span> <span class="n" style="color: #333;">liftedTypeKind</span><span class="p">)</span></span>
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208
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<pre style="margin: 0;">+<span id="LC208" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">snd</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><$></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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205
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209
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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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206
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210
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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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207
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211
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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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212
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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>
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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>
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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>
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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>
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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>
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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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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -214,10 +230,13 @@ tcHsSigType ctxt sig_ty</td>
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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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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -225,12 +244,14 @@ tcHsSigType ctxt sig_ty</td>
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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="248" style="width: 35px; color: rgba(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">@@ -248,11 +269,7 @@ 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="LC251" 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>
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<pre style="margin: 0;">-<span id="LC252" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in TcSimplify</span></span>
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<pre style="margin: 0;">-<span id="LC253" 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="n" style="color: #333;">failM</span></span>
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<pre style="margin: 0;">-<span id="LC254" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC255" 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;">insolubleWC</span> <span class="n" style="color: #333;">wanted</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="LC273" class="line" lang="haskell"></span>
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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>
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<pre style="margin: 0;"> <span id="LC275" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2225,7 +2242,8 @@ kindGeneralize :: TcType -> TcM [KindVar]</td>
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<pre style="margin: 0;"> <span id="LC2242" 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>
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2226
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2243
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<pre style="margin: 0;"> <span id="LC2243" 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>
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2227
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2244
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<pre style="margin: 0;"> <span id="LC2244" 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>
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<pre style="margin: 0;">-<span id="LC2228" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Input needn't be zonked.</span></span>
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2245
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<pre style="margin: 0;">+<span id="LC2245" 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>
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2246
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<pre style="margin: 0;">+<span id="LC2246" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- have a TcLevel higher than the ambient TcLevel.</span></span>
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2247
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<pre style="margin: 0;"> <span id="LC2247" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- NB: You must call solveEqualities or solveLocalEqualities before</span></span>
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2248
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<pre style="margin: 0;"> <span id="LC2248" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- kind generalization</span></span>
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2249
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<pre style="margin: 0;"> <span id="LC2249" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2243,7 +2261,8 @@ kindGeneralize kind_or_type</td>
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2261
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<pre style="margin: 0;"> <span id="LC2261" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2262" class="line" lang="haskell"><span class="cd">-- | This variant of 'kindGeneralize' refuses to generalize over any</span></span>
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2263
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<pre style="margin: 0;"> <span id="LC2263" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- variables free in the given WantedConstraints. Instead, it promotes</span></span>
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<pre style="margin: 0;">-<span id="LC2246" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- these variables into an outer TcLevel. See also</span></span>
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<pre style="margin: 0;">+<span id="LC2264" 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>
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<pre style="margin: 0;">+<span id="LC2265" 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>
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2266
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<pre style="margin: 0;"> <span id="LC2266" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note [Promoting unification variables] in TcSimplify</span></span>
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<pre style="margin: 0;"> <span id="LC2267" 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>
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2268
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<pre style="margin: 0;"> <span id="LC2268" 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>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/a22e51ea6f7a046c87d57ce30d143eef6abee9ff#367db94fc37c8c7548dbe545a5302c7a5108e41e"><strong>compiler/typecheck/TcMType.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -834,14 +834,14 @@ writeMetaTyVar tyvar ty</td>
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834
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834
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<pre style="margin: 0;"> <span id="LC834" class="line" lang="haskell"></span>
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835
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835
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<pre style="margin: 0;"> <span id="LC835" 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>
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836
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836
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<pre style="margin: 0;"> <span id="LC836" 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>
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837
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<pre style="margin: 0;">-<span id="LC837" 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>
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<pre style="margin: 0;">+<span id="LC837" 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>
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<pre style="margin: 0;"> <span id="LC838" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC839" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC840" 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>
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<pre style="margin: 0;"> <span id="LC841" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">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>
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<pre style="margin: 0;"> <span id="LC842" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC843" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<pre style="margin: 0;">-<span id="LC844" 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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<pre style="margin: 0;">+<span id="LC844" 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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<pre style="margin: 0;"> <span id="LC845" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC846" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC847" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--------------------</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1094,18 +1094,18 @@ we are trying to generalise this type:</td>
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<pre style="margin: 0;"> <span id="LC1094" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> forall arg. ... (alpha[tau]:arg) ...</span></span>
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<pre style="margin: 0;"> <span id="LC1095" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1096" 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>
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<pre style="margin: 0;">-<span id="LC1097" 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>
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<pre style="margin: 0;">+<span id="LC1097" 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>
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<pre style="margin: 0;"> <span id="LC1098" 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>
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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;">(see the test case for the full code).</span></span>
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1100
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<pre style="margin: 0;"> <span id="LC1100" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1101" 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>
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<pre style="margin: 0;"> <span id="LC1102" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> forall {a :: arg}. forall arg. ...blah...</span></span>
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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;">The fact that alpha's kind mentions arg renders it completely</span></span>
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<pre style="margin: 0;">-<span id="LC1104" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">ineligible for generaliation.</span></span>
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<pre style="margin: 0;">+<span id="LC1104" 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>
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1105
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<pre style="margin: 0;"> <span id="LC1105" class="line" lang="haskell"></span>
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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;">However, we are not going to learn any new constraints on alpha,</span></span>
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<pre style="margin: 0;">-<span id="LC1107" 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>
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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;">is entirely unconstrained.</span></span>
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<pre style="margin: 0;">+<span id="LC1107" 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>
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<pre style="margin: 0;">+<span id="LC1108" 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>
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<pre style="margin: 0;"> <span id="LC1109" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1110" 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>
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<pre style="margin: 0;"> <span id="LC1111" 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>
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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">@@ -1126,6 +1126,17 @@ We do this eager zapping in candidateQTyVars, which always precedes</td>
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<pre style="margin: 0;"> <span id="LC1126" 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>
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1127
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1127
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<pre style="margin: 0;"> <span id="LC1127" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">what skolems are in scope.</span></span>
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1128
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<pre style="margin: 0;"> <span id="LC1128" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1129" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Wrinkle:</span></span>
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1130
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<pre style="margin: 0;">+<span id="LC1130" class="line" lang="haskell"></span>
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1131
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<pre style="margin: 0;">+<span id="LC1131" 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>
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1132
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<pre style="margin: 0;">+<span id="LC1132" 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>
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1133
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<pre style="margin: 0;">+<span id="LC1133" 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>
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1134
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<pre style="margin: 0;">+<span id="LC1134" 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>
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1135
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<pre style="margin: 0;">+<span id="LC1135" 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>
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<pre style="margin: 0;">+<span id="LC1136" 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>
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1137
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<pre style="margin: 0;">+<span id="LC1137" 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>
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1138
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<pre style="margin: 0;">+<span id="LC1138" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in collect_cant_qtvs. Skipping this check caused #16517.</span></span>
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1139
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<pre style="margin: 0;">+<span id="LC1139" class="line" lang="haskell"></span>
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1129
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1140
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<pre style="margin: 0;"> <span id="LC1140" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1130
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1141
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<pre style="margin: 0;"> <span id="LC1141" class="line" lang="haskell"></span>
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1131
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1142
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<pre style="margin: 0;"> <span id="LC1142" 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>
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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">@@ -1173,13 +1184,17 @@ candidateKindVars dvs = dVarSetToVarSet (dv_kvs dvs)</td>
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1173
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1184
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<pre style="margin: 0;"> <span id="LC1184" class="line" lang="haskell"><span class="cd">-- | Gathers free variables to use as quantification candidates (in</span></span>
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1174
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1185
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<pre style="margin: 0;"> <span id="LC1185" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'quantifyTyVars'). This might output the same var</span></span>
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1175
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1186
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<pre style="margin: 0;"> <span id="LC1186" 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>
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1187
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<pre style="margin: 0;">+<span id="LC1187" 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>
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<pre style="margin: 0;">+<span id="LC1188" 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>
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1176
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1189
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<pre style="margin: 0;"> <span id="LC1189" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [CandidatesQTvs determinism and order]</span></span>
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1177
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1190
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<pre style="margin: 0;"> <span id="LC1190" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Dependent type variables]</span></span>
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1178
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1191
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<pre style="margin: 0;"> <span id="LC1191" class="line" lang="haskell"><span class="n" style="color: #333;">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>
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1179
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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;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">CandidatesQTvs</span></span>
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1180
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1193
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<pre style="margin: 0;"> <span id="LC1193" class="line" lang="haskell"><span class="n" style="color: #333;">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>
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1181
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1194
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<pre style="margin: 0;"> <span id="LC1194" class="line" lang="haskell"></span>
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1182
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<pre style="margin: 0;">-<span id="LC1182" class="line" lang="haskell"><span class="cd">-- | Like 'splitDepVarsOfType', but over a list of types</span></span>
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1195
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<pre style="margin: 0;">+<span id="LC1195" class="line" lang="haskell"><span class="cd">-- | Like 'candidateQTyVarsOfType', but over a list of types</span></span>
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1196
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<pre style="margin: 0;">+<span id="LC1196" 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>
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1197
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<pre style="margin: 0;">+<span id="LC1197" 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>
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1198
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<pre style="margin: 0;"> <span id="LC1198" 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>
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1184
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1199
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<pre style="margin: 0;"> <span id="LC1199" 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>
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1185
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1200
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<pre style="margin: 0;"> <span id="LC1200" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1218" style="width: 35px; color: rgba(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">@@ -1203,7 +1218,7 @@ delCandidates (DV { dv_kvs = kvs, dv_tvs = tvs, dv_cvs = cvs }) vars</td>
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1203
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1218
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<pre style="margin: 0;"> <span id="LC1218" class="line" lang="haskell"></span>
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1204
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1219
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<pre style="margin: 0;"> <span id="LC1219" class="line" lang="haskell"><span class="n" style="color: #333;">collect_cand_qtvs</span></span>
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1205
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1220
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<pre style="margin: 0;"> <span id="LC1220" 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>
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1206
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<pre style="margin: 0;">-<span id="LC1206" 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>
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1221
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<pre style="margin: 0;">+<span id="LC1221" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span> <span class="c1" style="color: #998; font-style: italic;">-- Bound variables (<span class="idiff left right">locals only</span>)</span></span>
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1207
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1222
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<pre style="margin: 0;"> <span id="LC1222" 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>
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1208
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1223
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<pre style="margin: 0;"> <span id="LC1223" 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>
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1209
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1224
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<pre style="margin: 0;"> <span id="LC1224" 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>
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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">@@ -1248,16 +1263,26 @@ collect_cand_qtvs is_dep bound dvs ty</td>
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1248
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1263
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<pre style="margin: 0;"> <span id="LC1263" class="line" lang="haskell"></span>
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1249
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1264
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<pre style="margin: 0;"> <span id="LC1264" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-----------------</span></span>
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1250
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1265
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<pre style="margin: 0;"> <span id="LC1265" 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>
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1251
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<pre style="margin: 0;">-<span id="LC1251" 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>
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1266
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<pre style="margin: 0;">+<span id="LC1266" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="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>
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1267
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<pre style="margin: 0;">+<span id="LC1267" 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>
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1268
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<pre style="margin: 0;">+<span id="LC1268" class="line" lang="haskell"></span>
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1252
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1269
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<pre style="margin: 0;"> <span id="LC1269" 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>
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1253
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<pre style="margin: 0;">-<span id="LC1253" 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>
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1270
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<pre style="margin: 0;">+<span id="LC1270" 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>
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1271
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<pre style="margin: 0;">+<span id="LC1271" 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>
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1272
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<pre style="margin: 0;">+<span id="LC1272" class="line" lang="haskell"></span>
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1254
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1273
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<pre style="margin: 0;"> <span id="LC1273" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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1255
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1274
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<pre style="margin: 0;"> <span id="LC1274" 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>
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1256
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1275
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<pre style="margin: 0;"> <span id="LC1275" 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>
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1257
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1276
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<pre style="margin: 0;"> <span id="LC1276" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ensure that the collected candidates have zonked kinds</span></span>
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1258
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1277
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<pre style="margin: 0;"> <span id="LC1277" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (#15795) and to make the naughty check</span></span>
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1259
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1278
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<pre style="margin: 0;"> <span id="LC1278" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (which comes next) works correctly</span></span>
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1260
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<pre style="margin: 0;">-<span id="LC1260" 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>
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1279
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<pre style="margin: 0;">+<span id="LC1279" class="line" lang="haskell"></span>
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1280
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<pre style="margin: 0;">+<span id="LC1280" 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>
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1281
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<pre style="margin: 0;">+<span id="LC1281" 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>
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1282
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<pre style="margin: 0;">+<span id="LC1282" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- this tyvar is from an outer context: see Wrinkle</span></span>
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1283
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<pre style="margin: 0;">+<span id="LC1283" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in Note [Naughty quantification candidates]</span></span>
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1284
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<pre style="margin: 0;">+<span id="LC1284" class="line" lang="haskell"></span>
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1285
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<pre style="margin: 0;">+<span id="LC1285" 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>
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1261
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1286
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<pre style="margin: 0;"> <span id="LC1286" class="line" lang="haskell"></span>
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1262
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1287
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<pre style="margin: 0;"> <span id="LC1287" 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>
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1263
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1288
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<pre style="margin: 0;"> <span id="LC1288" 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>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/a22e51ea6f7a046c87d57ce30d143eef6abee9ff#2799ba786adc98d485fad6003334b913a0069bdc"><strong>compiler/typecheck/TcRnDriver.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">@@ -2435,12 +2435,13 @@ tcRnType hsc_env flexi normalise rdr_type</td>
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2435
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<pre style="margin: 0;"> <span id="LC2435" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- It can have any rank or kind</span></span>
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<pre style="margin: 0;"> <span id="LC2436" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- First bring into scope any wildcards</span></span>
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<pre style="margin: 0;"> <span id="LC2437" 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>
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<pre style="margin: 0;">-<span id="LC2438" 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>
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<pre style="margin: 0;">-<span id="LC2439" class="line" lang="haskell"> <span class="n" style="color: #333;">captureTopConstraints</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC2438" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">ty</span><span class="p">,</span> <span class="n" style="color: #333;">kind</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pushTcLevelM_</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC2439" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- must push level to satisfy level precondition of</span></span>
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<pre style="margin: 0;">+<span id="LC2440" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- kindGeneralize, below</span></span>
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<pre style="margin: 0;">+<span id="LC2441" class="line" lang="haskell"> <span class="n" style="color: #333;">solveEqualities</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC2442" class="line" lang="haskell"> <span class="n" style="color: #333;">tcWildCardBinders</span> <span class="n" style="color: #333;">wcs</span> <span class="o" style="font-weight: 600;">$</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>
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<pre style="margin: 0;"> <span id="LC2443" 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>
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<pre style="margin: 0;"> <span id="LC2444" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tcLHsTypeUnsaturated</span> <span class="n" style="color: #333;">rn_type</span> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC2443" 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>
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<pre style="margin: 0;"> <span id="LC2445" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2446" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Do kind generalisation; see Note [Kind-generalise in tcRnType]</span></span>
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<pre style="margin: 0;"> <span id="LC2447" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">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>
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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">@@ -2090,6 +2090,16 @@ see dropDerivedWC. For example</td>
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<pre style="margin: 0;"> <span id="LC2090" 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>
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<pre style="margin: 0;"> <span id="LC2091" 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>
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<pre style="margin: 0;"> <span id="LC2092" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2093" 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>
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<pre style="margin: 0;">+<span id="LC2094" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> their insoluble Deriveds. For example:</span></span>
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<pre style="margin: 0;">+<span id="LC2095" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2096" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> forall a[2]. [W] alpha[1] ~ Int</span></span>
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<pre style="margin: 0;">+<span id="LC2097" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] alpha[1] ~ Bool</span></span>
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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;"> [D] Int ~ Bool</span></span>
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2099
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<pre style="margin: 0;">+<span id="LC2099" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2100" 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>
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<pre style="margin: 0;">+<span id="LC2101" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> out.</span></span>
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2102
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<pre style="margin: 0;">+<span id="LC2102" class="line" lang="haskell"></span>
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2093
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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;">But (tiresomely) we do keep *some* Derived constraints:</span></span>
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2104
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<pre style="margin: 0;"> <span id="LC2104" class="line" lang="haskell"></span>
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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;"> * Type holes are derived constraints, because they have no evidence</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">@@ -2098,8 +2108,7 @@ But (tiresomely) we do keep *some* Derived constraints:</td>
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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;"> * Insoluble kind equalities (e.g. [D] * ~ (* -> *)), with</span></span>
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2109
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<pre style="margin: 0;"> <span id="LC2109" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> KindEqOrigin, may arise from a type equality a ~ Int#, say. See</span></span>
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<pre style="margin: 0;"> <span id="LC2110" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Note [Equalities with incompatible kinds] in TcCanonical.</span></span>
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<pre style="margin: 0;">-<span id="LC2101" 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>
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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;"> source locations and hence different error messages.</span></span>
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<pre style="margin: 0;">+<span id="LC2111" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Keeping these around produces better error messages, in practice.</span></span>
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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;"> E.g., test case dependent/should_fail/T11471</span></span>
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2113
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<pre style="margin: 0;"> <span id="LC2113" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2114" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * We keep most derived equalities arising from functional dependencies</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/a22e51ea6f7a046c87d57ce30d143eef6abee9ff#75d517f701402b106e4d98d255eb24b57ba72aab"><strong>compiler/typecheck/TcSimplify.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">@@ -169,9 +169,10 @@ solveLocalEqualities callsite thing_inside</td>
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<pre style="margin: 0;"> <span id="LC169" 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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<pre style="margin: 0;"> <span id="LC170" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC171" 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>
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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;">if</span> <span class="n" style="color: #333;">insolubleWC</span> <span class="n" style="color: #333;">wanted</span></span>
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<pre style="margin: 0;">-<span id="LC173" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">failM</span></span>
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<pre style="margin: 0;">-<span id="LC174" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">res</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC172" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">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>
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<pre style="margin: 0;">+<span id="LC173" class="line" lang="haskell"> <span class="n" style="color: #333;">failM</span></span>
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<pre style="margin: 0;">+<span id="LC174" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC175" 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>
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<pre style="margin: 0;"> <span id="LC176" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC177" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Fail fast if there are insoluble kind equalities]</span></span>
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<pre style="margin: 0;"> <span id="LC178" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<li id="bdfa0cc139f61d1236abc1598c5d684b43c357f9">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/a22e51ea6f7a046c87d57ce30d143eef6abee9ff#bdfa0cc139f61d1236abc1598c5d684b43c357f9"><strong>compiler/typecheck/TcTyClsDecls.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">@@ -568,7 +568,7 @@ generaliseTcTyCon tc</td>
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<pre style="margin: 0;"> <span id="LC568" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Running example in Note [Inferring kinds for type declarations]</span></span>
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<pre style="margin: 0;"> <span id="LC569" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- spec_req_prs = [ ("k1",kk1), ("a", (aa::kk1))</span></span>
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<pre style="margin: 0;"> <span id="LC570" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- , ("k2",kk2), ("x", (xx::kk2))]</span></span>
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<pre style="margin: 0;">-<span id="LC571" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- where "k1" dnotes the Name k1, and kk1, aa, etc are MetaTyVars<span class="idiff left right">s</span>,</span></span>
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<pre style="margin: 0;">+<span id="LC571" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- where "k1" dnotes the Name k1, and kk1, aa, etc are MetaTyVars,</span></span>
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<pre style="margin: 0;"> <span id="LC572" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- specifically TyVarTvs</span></span>
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<pre style="margin: 0;"> <span id="LC573" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC574" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Step 0: zonk and skolemise the Specified and Required binders</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">@@ -1153,9 +1153,11 @@ kcTyClDecl (ClassDecl { tcdLName = (dL->L _ name)</td>
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1153
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<pre style="margin: 0;"> <span id="LC1153" 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>
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1154
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1154
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<pre style="margin: 0;"> <span id="LC1154" 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>
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1155
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1155
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<pre style="margin: 0;"> <span id="LC1155" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1156
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<pre style="margin: 0;">-<span id="LC1156" class="line" lang="haskell"> <span class="n" style="color: #333;">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>
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<pre style="margin: 0;">+<span id="LC1156" 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>
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1157
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<pre style="margin: 0;"> <span id="LC1157" 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>
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1158
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1158
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<pre style="margin: 0;"> <span id="LC1158" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1159" 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>
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1160
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<pre style="margin: 0;">+<span id="LC1160" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1161" 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>
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<pre style="margin: 0;"> <span id="LC1162" 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>
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<pre style="margin: 0;"> <span id="LC1163" 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>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/a22e51ea6f7a046c87d57ce30d143eef6abee9ff#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">@@ -522,6 +522,17 @@ superSkolemTv = SkolemTv topTcLevel True -- Treat this as a completely disti</td>
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<pre style="margin: 0;"> <span id="LC522" 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="LC523" 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="LC524" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC525" 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="LC526" 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="LC527" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC528" 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="LC529" 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="LC530" 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="LC531" 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="LC532" 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="LC533" 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="LC534" 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="LC535" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC536" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-----------------------------</span></span>
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<pre style="margin: 0;"> <span id="LC537" 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="LC538" 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">@@ -550,20 +561,11 @@ instance Outputable MetaDetails where</td>
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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;">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="LC562" 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="LC563" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC553" 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="LC554" 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="LC555" 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="LC556" 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="LC557" 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="LC558" 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="LC559" 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="LC560" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC561" 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="LC562" 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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<pre style="margin: 0;">-<span id="LC563" 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="LC564" 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="LC565" 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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<pre style="margin: 0;">-<span id="LC566" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC564" 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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<pre style="margin: 0;">+<span id="LC565" 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>
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<pre style="margin: 0;">+<span id="LC566" 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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<pre style="margin: 0;">+<span id="LC567" 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>
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<pre style="margin: 0;">+<span id="LC568" 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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<pre style="margin: 0;"> <span id="LC569" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC570" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *********************************************************************</span></span>
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<pre style="margin: 0;"> <span id="LC571" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* *</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -801,10 +803,10 @@ checkTcLevelInvariant :: TcLevel -> TcLevel -> Bool</td>
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<pre style="margin: 0;"> <span id="LC803" 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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<pre style="margin: 0;"> <span id="LC804" 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>
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<pre style="margin: 0;"> <span id="LC805" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC806" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returns topTcLevel for non-TcTyVars</span></span>
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<pre style="margin: 0;"> <span id="LC807" 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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<pre style="margin: 0;"> <span id="LC808" class="line" lang="haskell"><span class="n" style="color: #333;">tcTyVarLevel</span> <span class="n" style="color: #333;">tv</span></span>
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<pre style="margin: 0;">-<span id="LC806" 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>
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<pre style="margin: 0;">-<span id="LC807" 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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<pre style="margin: 0;">+<span id="LC809" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">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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808
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810
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<pre style="margin: 0;"> <span id="LC810" 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>
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809
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811
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<pre style="margin: 0;"> <span id="LC811" 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>
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810
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812
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<pre style="margin: 0;"> <span id="LC812" 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>
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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>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">import Data.Proxy</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext">:kind! 'Proxy @_</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/a22e51ea6f7a046c87d57ce30d143eef6abee9ff#8c9b98ada81eb0b5ce37764a0ca63adffb8549d6"><strong>testsuite/tests/ghci/scripts/T16767.stdout</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">'Proxy @_ :: forall {k} {_ :: k}. Proxy @{k} _</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">= 'Proxy @{k} @_</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/a22e51ea6f7a046c87d57ce30d143eef6abee9ff#080fb38cc741d3f1a476696b3373ab7cf48c2aaa"><strong>testsuite/tests/ghci/scripts/all.T</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -297,3 +297,4 @@ test('T14828', normal, ghci_script, ['T14828.script'])</td>
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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;">'T16376'</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;">'T16376.script'</span><span class="p">])</span></span>
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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>
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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;">'T16569'</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;">'T16569.script'</span><span class="p">])</span></span>
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<pre style="margin: 0;">+<span id="LC300" 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>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/a22e51ea6f7a046c87d57ce30d143eef6abee9ff#f80799ecc01331b244dad18a881729fbb1f7bfb5"><strong>testsuite/tests/typecheck/should_fail/T16517.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE PolyKinds #-}</span></span>
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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>
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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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<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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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T16517.hs:5:29: error:</span>
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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>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> In the type signature: m :: Proxy (a :: k)</span>
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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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<a href="https://gitlab.haskell.org/ghc/ghc/commit/a22e51ea6f7a046c87d57ce30d143eef6abee9ff#b9e86d897a62509b0114d81d5e736630d6f68f43"><strong>testsuite/tests/typecheck/should_fail/all.T</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -517,3 +517,4 @@ test('T16414', normal, compile_fail, [''])</td>
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<pre style="margin: 0;"> <span id="LC517" class="line" lang="perl"><span class="s" style="color: #d14;">test('</span><span class="nv" style="color: #008080;">T16456</span><span class="s" style="color: #d14;">', normal, compile_fail, ['</span><span class="o" style="font-weight: 600;">-</span><span class="nv" style="color: #008080;">fprint</span><span class="o" style="font-weight: 600;">-</span><span class="nv" style="color: #008080;">explicit</span><span class="o" style="font-weight: 600;">-</span><span class="nv" style="color: #008080;">foralls</span><span class="s" style="color: #d14;">'])</span></span>
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<pre style="margin: 0;"> <span id="LC518" class="line" lang="perl"><span class="s" style="color: #d14;">test('</span><span class="nv" style="color: #008080;">T16627</span><span class="s" style="color: #d14;">', normal, compile_fail, [''])</span></span>
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<pre style="margin: 0;"> <span id="LC519" class="line" lang="perl"><span class="s" style="color: #d14;">test('</span><span class="nv" style="color: #008080;">T502</span><span class="s" style="color: #d14;">', normal, compile_fail, [''])</span></span>
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<pre style="margin: 0;">+<span id="LC520" 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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<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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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext"> toXML :: a -> XML</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> • In the type signature: toXML :: a -> XML</span>
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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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