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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/822f10575d207a2a47b21ac853dcf28c655041c4">822f1057</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-09-09T00:46:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Postpone associated tyfam default checks until after typechecking
Previously, associated type family defaults were validity-checked
during typechecking. Unfortunately, the error messages that these
checks produce run the risk of printing knot-tied type constructors,
which will cause GHC to diverge. In order to preserve the current
error message's descriptiveness, this patch postpones these validity
checks until after typechecking, which are now located in the new
function `GHC.Tc.Validity.checkValidAssocTyFamDeflt`.
Fixes #18648.
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<h4>17 changed files:</h4>
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<li class="file-stats">
<a href="#e39f2416dd3b2af571ddd26dcca3476a55810c41">
compiler/GHC/Core/Class.hs
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<li class="file-stats">
<a href="#079d6b28856775716c78fdd4a4b35bb45a59002c">
compiler/GHC/Iface/Syntax.hs
</a>
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<li class="file-stats">
<a href="#06ff7bac58fd8cfe0c17b81963b03f4cce86a065">
compiler/GHC/IfaceToCore.hs
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<li class="file-stats">
<a href="#83d23a46bb6cdc8b1edc16f1fd2c8f5c53e2c9ca">
compiler/GHC/Tc/TyCl.hs
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<li class="file-stats">
<a href="#1db07ed8cd9bab6b217a8f5a140176d3cb8672fd">
compiler/GHC/Tc/Validity.hs
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<li class="file-stats">
<a href="#0942e35743c77f939f29199ed453d13b576a52e9">
testsuite/tests/indexed-types/should_compile/T11361a.stderr
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<li class="file-stats">
<a href="#f5b2262300e77de7b0dbf5f0bd21be0a48df6f4f">
testsuite/tests/indexed-types/should_fail/SimpleFail4.stderr
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<li class="file-stats">
<a href="#69edc75f6597d0874498e964811e0c9ea4b7b1ef">
testsuite/tests/indexed-types/should_fail/T13971.stderr
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<li class="file-stats">
<a href="#ad0b4d579659de4effeafb89612694d8b6b98bf6">
testsuite/tests/indexed-types/should_fail/T13971b.stderr
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<li class="file-stats">
<a href="#a605ff400901085182447c89828b2de1a5dbb0f6">
testsuite/tests/indexed-types/should_fail/T16110_Fail2.stderr
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<li class="file-stats">
<a href="#e88311a0cc719a5d07f737b9fa0a0b5bd6b4e938">
testsuite/tests/indexed-types/should_fail/T16110_Fail3.stderr
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<li class="file-stats">
<a href="#0509b890ea835e45302350905e2fbc28d868c7d5">
testsuite/tests/indexed-types/should_fail/T16356_Fail1.stderr
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<li class="file-stats">
<a href="#8029ad8879e2eade66ead20902b7f97ae4966d6d">
testsuite/tests/indexed-types/should_fail/T16356_Fail2.stderr
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<li class="file-stats">
<a href="#5466b7f8753a781e231b5cafad858c193b9f8dfe">
<span class="new-file">
+
testsuite/tests/indexed-types/should_fail/T18648.hs
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<a href="#c2fcda265b5450370758d78c30a59f775f1b1b26">
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+
testsuite/tests/indexed-types/should_fail/T18648.stderr
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<li class="file-stats">
<a href="#3e0457789f3266c805563b6a84cef1dfb08aed7e">
testsuite/tests/indexed-types/should_fail/all.T
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<li class="file-stats">
<a href="#dba733963d9a087722ebf0b37d43aa7dc7748c35">
testsuite/tests/typecheck/should_fail/AssocTyDef02.stderr
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<h4>Changes:</h4>
<li id="e39f2416dd3b2af571ddd26dcca3476a55810c41">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/822f10575d207a2a47b21ac853dcf28c655041c4#e39f2416dd3b2af571ddd26dcca3476a55810c41"><strong>compiler/GHC/Core/Class.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="8" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -8,7 +8,7 @@</td>
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<td class="diff-line-num old_line" data-linenumber="8" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.Core.Class</span> <span class="p">(</span></span>
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<td class="diff-line-num old_line" data-linenumber="9" style="width: 35px; color: rgba(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="9" style="width: 35px; color: rgba(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="LC9" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Class</span><span class="p">,</span></span>
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<td class="diff-line-num old_line" data-linenumber="10" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<td class="diff-line-num new_line" data-linenumber="10" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ClassOpItem</span><span class="p">,</span></span>
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<td class="diff-line-num new_line old" data-linenumber="11" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC11" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ClassATItem</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span></span>
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<td class="diff-line-num new new_line" data-linenumber="11" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ClassATItem</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span><span class="idiff left"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">ATValidityInfo</span></span><span class="p"><span class="idiff">(</span></span><span class="o" style="font-weight: 600;"><span class="idiff">..</span></span><span class="p"><span class="idiff right">),</span></span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="12" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
12
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<td class="diff-line-num new_line" data-linenumber="12" style="width: 35px; color: rgba(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="LC12" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ClassMinimalDef</span><span class="p">,</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="13" style="width: 35px; color: rgba(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="13" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
13
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">DefMethInfo</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">pprDefMethInfo</span><span class="p">,</span></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="14" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"></span>
</pre>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="97" style="width: 35px; color: rgba(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="97" style="width: 35px; color: rgba(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">@@ -97,10 +97,21 @@ type DefMethInfo = Maybe (Name, DefMethSpec Type)</td>
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<pre style="margin: 0;"> <span id="LC97" class="line" lang="haskell"></span>
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<td class="diff-line-num old_line" data-linenumber="98" style="width: 35px; color: rgba(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="LC98" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">ClassATItem</span></span>
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<td class="diff-line-num old_line" data-linenumber="99" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC99" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ATI</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Associated type tyvar names]</span></span>
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<td class="diff-line-num old old_line" data-linenumber="100" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC100" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">SrcSpan</span></span><span class="p">))</span></span>
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<td class="diff-line-num new old_line" data-linenumber="101" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="100" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC100" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">ATValidityInfo</span></span><span class="p">))</span></span>
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<td class="diff-line-num old_line" data-linenumber="101" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC101" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Default associated type (if any) from this template</span></span>
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<td class="diff-line-num old_line" data-linenumber="102" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC102" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Associated type defaults]</span></span>
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<pre style="margin: 0;"> <span id="LC103" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC104" class="line" lang="haskell"><span class="cd">-- | Information about an associated type family default implementation. This</span></span>
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<pre style="margin: 0;">+<span id="LC105" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- is used solely for validity checking.</span></span>
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<pre style="margin: 0;">+<span id="LC106" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See @Note [Type-checking default assoc decls]@ in "GHC.Tc.TyCl".</span></span>
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<pre style="margin: 0;">+<span id="LC107" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">ATValidityInfo</span></span>
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<pre style="margin: 0;">+<span id="LC108" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NoATVI</span> <span class="c1" style="color: #998; font-style: italic;">-- Used for associated type families that are imported</span></span>
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<pre style="margin: 0;">+<span id="LC109" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- from another module, for which we don't need to</span></span>
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<pre style="margin: 0;">+<span id="LC110" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- perform any validity checking.</span></span>
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<pre style="margin: 0;">+<span id="LC111" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC112" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">ATVI</span> <span class="kt" style="color: #458; font-weight: 600;">SrcSpan</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- Used for locally defined associated type families.</span></span>
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<pre style="margin: 0;">+<span id="LC113" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The [Type] are the LHS patterns.</span></span>
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<pre style="margin: 0;">+<span id="LC114" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC115" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">ClassMinimalDef</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">BooleanFormula</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="c1" style="color: #998; font-style: italic;">-- Required methods</span></span>
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<pre style="margin: 0;"> <span id="LC116" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC117" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">ClassBody</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/822f10575d207a2a47b21ac853dcf28c655041c4#079d6b28856775716c78fdd4a4b35bb45a59002c"><strong>compiler/GHC/Iface/Syntax.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">@@ -215,7 +215,7 @@ data IfaceClassOp</td>
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<pre style="margin: 0;"> <span id="LC215" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- and the default method, are *not* quantified</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;">-- over the class variables</span></span>
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<pre style="margin: 0;"> <span id="LC217" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC218" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">IfaceAT</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">IfaceAT</span> <span class="c1" style="color: #998; font-style: italic;">-- See Class.ClassATItem</span></span>
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<pre style="margin: 0;">+<span id="LC218" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">IfaceAT</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">IfaceAT</span> <span class="c1" style="color: #998; font-style: italic;">-- See <span class="idiff left right">GHC.Core.</span>Class.ClassATItem</span></span>
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<pre style="margin: 0;"> <span id="LC219" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">IfaceDecl</span> <span class="c1" style="color: #998; font-style: italic;">-- The associated type declaration</span></span>
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<pre style="margin: 0;"> <span id="LC220" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">IfaceType</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Default associated type instance, if any</span></span>
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<pre style="margin: 0;"> <span id="LC221" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/822f10575d207a2a47b21ac853dcf28c655041c4#06ff7bac58fd8cfe0c17b81963b03f4cce86a065"><strong>compiler/GHC/IfaceToCore.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">@@ -791,7 +791,7 @@ tc_iface_decl _parent ignore_prags</td>
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<pre style="margin: 0;"> <span id="LC791" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">def</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">forkM</span> <span class="p">(</span><span class="n" style="color: #333;">mk_at_doc</span> <span class="n" style="color: #333;">tc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC792" class="line" lang="haskell"> <span class="n" style="color: #333;">extendIfaceTyVarEnv</span> <span class="p">(</span><span class="n" style="color: #333;">tyConTyVars</span> <span class="n" style="color: #333;">tc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC793" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">tc_def</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcIfaceType</span> <span class="n" style="color: #333;">def</span></span>
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<pre style="margin: 0;">-<span id="LC794" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">tc_def</span><span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left right">noSrcSpan</span></span><span class="p">))</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC794" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">tc_def</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">NoATVI</span></span><span class="p">))</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC795" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Must be done lazily in case the RHS of the defaults mention</span></span>
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<pre style="margin: 0;"> <span id="LC796" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the type constructor being defined here</span></span>
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<pre style="margin: 0;"> <span id="LC797" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- e.g. type AT a; type AT b = AT [b] #8002</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/822f10575d207a2a47b21ac853dcf28c655041c4#83d23a46bb6cdc8b1edc16f1fd2c8f5c53e2c9ca"><strong>compiler/GHC/Tc/TyCl.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">@@ -52,7 +52,7 @@ import GHC.Core.Coercion</td>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types.Origin</span></span>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Type</span></span>
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCo.Rep</span> <span class="c1" style="color: #998; font-style: italic;">-- for checkValidRoles</span></span>
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<pre style="margin: 0;">-<span id="LC55" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCo.Ppr</span><span class="p">(</span> <span class="n" style="color: #333;">pprTyVars</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">pprWithExplicitKindsWhen</span></span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC55" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCo.Ppr</span><span class="p">(</span> <span class="n" style="color: #333;">pprTyVars</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Class</span></span>
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<pre style="margin: 0;"> <span id="LC57" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Coercion.Axiom</span></span>
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<pre style="margin: 0;"> <span id="LC58" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCon</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -79,11 +79,9 @@ import GHC.Types.Basic</td>
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<pre style="margin: 0;"> <span id="LC79" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="k" style="font-weight: 600;">qualified</span> <span class="nn" style="color: #555;">GHC.LanguageExtensions</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">LangExt</span></span>
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<pre style="margin: 0;"> <span id="LC80" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC81" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Monad</span></span>
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<pre style="margin: 0;">-<span id="LC82" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Foldable</span></span>
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<pre style="margin: 0;"> <span id="LC82" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Function</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">on</span> <span class="p">)</span></span>
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84
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<pre style="margin: 0;"> <span id="LC83" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Functor.Identity</span></span>
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<pre style="margin: 0;"> <span id="LC84" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.List</span></span>
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<pre style="margin: 0;">-<span id="LC86" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="k" style="font-weight: 600;">qualified</span> <span class="nn" style="color: #555;">Data.List.NonEmpty</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">NE</span></span>
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<pre style="margin: 0;"> <span id="LC85" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.List.NonEmpty</span> <span class="p">(</span> <span class="kt" style="color: #458; font-weight: 600;">NonEmpty</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">)</span> <span class="p">)</span></span>
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88
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<pre style="margin: 0;"> <span id="LC86" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="k" style="font-weight: 600;">qualified</span> <span class="nn" style="color: #555;">Data.Set</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">Set</span></span>
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<pre style="margin: 0;"> <span id="LC87" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Tuple</span><span class="p">(</span> <span class="n" style="color: #333;">swap</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">@@ -2393,9 +2391,9 @@ tcClassATs class_name cls ats at_defs</td>
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<pre style="margin: 0;"> <span id="LC2391" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2392" 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="LC2393" class="line" lang="haskell"><span class="n" style="color: #333;">tcDefaultAssocDecl</span> <span class="o" style="font-weight: 600;">::</span></span>
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<pre style="margin: 0;">-<span id="LC2396" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Family TyCon (not knot-tied)</span></span>
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2397
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<pre style="margin: 0;">-<span id="LC2397" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LTyFamDefltDecl</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Defaults</span></span>
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2398
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<pre style="margin: 0;">-<span id="LC2398" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">KnotTied</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">SrcSpan</span></span><span class="p">))</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Type checked RHS</span></span>
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<pre style="margin: 0;">+<span id="LC2394" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="idiff left right"> </span><span class="c1" style="color: #998; font-style: italic;">-- ^ Family TyCon (not knot-tied)</span></span>
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<pre style="margin: 0;">+<span id="LC2395" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">LTyFamDefltDecl</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">]</span> <span class="idiff left right"> </span><span class="c1" style="color: #998; font-style: italic;">-- ^ Defaults</span></span>
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<pre style="margin: 0;">+<span id="LC2396" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">KnotTied</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">ATValidityInfo</span></span><span class="p">))</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Type checked RHS</span></span>
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<pre style="margin: 0;"> <span id="LC2397" class="line" lang="haskell"><span class="n" style="color: #333;">tcDefaultAssocDecl</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;"> <span id="LC2398" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="c1" style="color: #998; font-style: italic;">-- No default declaration</span></span>
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<pre style="margin: 0;"> <span id="LC2399" 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">@@ -2436,73 +2434,27 @@ tcDefaultAssocDecl fam_tc</td>
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<pre style="margin: 0;"> <span id="LC2434" class="line" lang="haskell"> <span class="n" style="color: #333;">imp_vars</span> <span class="p">(</span><span class="n" style="color: #333;">mb_expl_bndrs</span> <span class="p">`</span><span class="n" style="color: #333;">orElse</span><span class="p">`</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2435" class="line" lang="haskell"> <span class="n" style="color: #333;">hs_pats</span> <span class="n" style="color: #333;">hs_rhs_ty</span></span>
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<pre style="margin: 0;"> <span id="LC2436" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2439" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">fam_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyConTyVars</span> <span class="n" style="color: #333;">fam_tc</span></span>
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<pre style="margin: 0;">-<span id="LC2440" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr_eqn</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ppr_default_eqn</span> <span class="n" style="color: #333;">pats</span> <span class="n" style="color: #333;">rhs_ty</span></span>
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<pre style="margin: 0;">-<span id="LC2441" class="line" lang="haskell"> <span class="n" style="color: #333;">pats_vis</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyConArgFlags</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">pats</span></span>
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<pre style="margin: 0;">+<span id="LC2437" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">fam_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyConTyVars</span> <span class="n" style="color: #333;">fam_tc</span></span>
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<pre style="margin: 0;"> <span id="LC2438" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tcDefaultAssocDecl 2"</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span></span>
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<pre style="margin: 0;">-<span id="LC2443" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"fam_tvs"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fam_tvs</span></span>
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<pre style="margin: 0;">+<span id="LC2439" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"hs_pats"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">hs_pats</span></span>
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<pre style="margin: 0;">+<span id="LC2440" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"hs_rhs_ty"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">hs_rhs_ty</span></span>
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<pre style="margin: 0;">+<span id="LC2441" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"fam_tvs"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fam_tvs</span></span>
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<pre style="margin: 0;"> <span id="LC2442" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"qtvs"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">qtvs</span></span>
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<pre style="margin: 0;">-<span id="LC2445" class="line" lang="haskell"> <span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">text</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"pats"</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><+></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">pats</span></span></span>
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<pre style="margin: 0;">-<span id="LC2446" class="line" lang="haskell"> <span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">text</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"rhs_ty"</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><+></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">rhs_ty</span></span></span>
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<pre style="margin: 0;">+<span id="LC2443" class="line" lang="haskell"> <span class="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- NB: Do *not* print `pats` or rhs_ty here, as they can mention</span></span></span>
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<pre style="margin: 0;">+<span id="LC2444" class="line" lang="haskell"> <span class="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- knot-tied TyCons. See #18648.</span></span></span>
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<pre style="margin: 0;"> <span id="LC2445" class="line" lang="haskell"> <span class="p">])</span></span>
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<pre style="margin: 0;">-<span id="LC2448" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">cpt_tvs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zipWithM</span> <span class="p">(</span><span class="n" style="color: #333;">extract_tv</span> <span class="n" style="color: #333;">ppr_eqn</span><span class="p">)</span> <span class="n" style="color: #333;">pats</span> <span class="n" style="color: #333;">pats_vis</span></span>
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<pre style="margin: 0;">-<span id="LC2449" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">check_all_distinct_tvs</span> <span class="n" style="color: #333;">ppr_eqn</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">zip</span> <span class="n" style="color: #333;">cpt_tvs</span> <span class="n" style="color: #333;">pats_vis</span></span>
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<pre style="margin: 0;">-<span id="LC2450" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">subst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">zipTvSubst</span> <span class="n" style="color: #333;">cpt_tvs</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyVarTys</span> <span class="n" style="color: #333;">fam_tvs</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC2451" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">pure</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">substTyUnchecked</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">rhs_ty</span><span class="p">,</span> <span class="n" style="color: #333;">loc</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC2452" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We also perform other checks for well-formedness and validity</span></span>
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<pre style="margin: 0;">-<span id="LC2453" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- later, in checkValidClass</span></span>
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<pre style="margin: 0;">+<span id="LC2446" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">subst</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">traverse</span> <span class="n" style="color: #333;">getTyVar_maybe</span> <span class="n" style="color: #333;">pats</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC2447" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">cpt_tvs</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">zipTvSubst</span> <span class="n" style="color: #333;">cpt_tvs</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyVarTys</span> <span class="n" style="color: #333;">fam_tvs</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2448" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">emptyTCvSubst</span></span>
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<pre style="margin: 0;">+<span id="LC2449" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The Nothing case can only be reached in invalid</span></span>
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<pre style="margin: 0;">+<span id="LC2450" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- associated type family defaults. In such cases, we</span></span>
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<pre style="margin: 0;">+<span id="LC2451" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- simply create an empty substitution and let GHC fall</span></span>
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<pre style="margin: 0;">+<span id="LC2452" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- over later, in GHC.Tc.Validity.checkValidAssocTyFamDeflt.</span></span>
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<pre style="margin: 0;">+<span id="LC2453" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Type-checking default assoc decls].</span></span>
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<pre style="margin: 0;">+<span id="LC2454" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">pure</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">substTyUnchecked</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">rhs_ty</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">ATVI</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">pats</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2455" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We perform checks for well-formedness and validity later, in</span></span>
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<pre style="margin: 0;">+<span id="LC2456" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- GHC.Tc.Validity.checkValidAssocTyFamDeflt.</span></span>
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<pre style="margin: 0;"> <span id="LC2457" class="line" lang="haskell"> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC2455" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2456
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<pre style="margin: 0;">-<span id="LC2456" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Checks that a pattern on the LHS of a default is a type</span></span>
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2457
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<pre style="margin: 0;">-<span id="LC2457" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- variable. If so, return the underlying type variable, and if</span></span>
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2458
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<pre style="margin: 0;">-<span id="LC2458" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- not, throw an error.</span></span>
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2459
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<pre style="margin: 0;">-<span id="LC2459" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Type-checking default assoc decls]</span></span>
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<pre style="margin: 0;">-<span id="LC2460" class="line" lang="haskell"> <span class="n" style="color: #333;">extract_tv</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="c1" style="color: #998; font-style: italic;">-- The pretty-printed default equation</span></span>
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2461
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<pre style="margin: 0;">-<span id="LC2461" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (only used for error message purposes)</span></span>
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2462
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<pre style="margin: 0;">-<span id="LC2462" 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;">-- The particular type pattern from which to extract</span></span>
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2463
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<pre style="margin: 0;">-<span id="LC2463" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- its underlying type variable</span></span>
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2464
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<pre style="margin: 0;">-<span id="LC2464" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ArgFlag</span> <span class="c1" style="color: #998; font-style: italic;">-- The visibility of the type pattern</span></span>
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2465
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<pre style="margin: 0;">-<span id="LC2465" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (only used for error message purposes)</span></span>
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2466
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<pre style="margin: 0;">-<span id="LC2466" 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;">TyVar</span></span>
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2467
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<pre style="margin: 0;">-<span id="LC2467" class="line" lang="haskell"> <span class="n" style="color: #333;">extract_tv</span> <span class="n" style="color: #333;">ppr_eqn</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">pat_vis</span> <span class="o" style="font-weight: 600;">=</span></span>
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2468
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<pre style="margin: 0;">-<span id="LC2468" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">getTyVar_maybe</span> <span class="n" style="color: #333;">pat</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2469
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<pre style="margin: 0;">-<span id="LC2469" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">tv</span></span>
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2470
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<pre style="margin: 0;">-<span id="LC2470" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">failWithTc</span> <span class="o" style="font-weight: 600;">$</span></span>
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2471
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<pre style="margin: 0;">-<span id="LC2471" class="line" lang="haskell"> <span class="n" style="color: #333;">pprWithExplicitKindsWhen</span> <span class="p">(</span><span class="n" style="color: #333;">isInvisibleArgFlag</span> <span class="n" style="color: #333;">pat_vis</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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2472
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<pre style="margin: 0;">-<span id="LC2472" class="line" lang="haskell"> <span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Illegal argument"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">pat</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;">"in:"</span><span class="p">)</span></span>
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2473
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<pre style="margin: 0;">-<span id="LC2473" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span><span class="n" style="color: #333;">ppr_eqn</span><span class="p">,</span> <span class="n" style="color: #333;">suggestion</span><span class="p">])</span></span>
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2474
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<pre style="margin: 0;">-<span id="LC2474" class="line" lang="haskell"></span>
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2475
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<pre style="margin: 0;">-<span id="LC2475" class="line" lang="haskell"></span>
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2476
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<pre style="margin: 0;">-<span id="LC2476" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Checks that no type variables in an associated default declaration are</span></span>
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2477
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<pre style="margin: 0;">-<span id="LC2477" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- duplicated. If that is the case, throw an error.</span></span>
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2478
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<pre style="margin: 0;">-<span id="LC2478" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Type-checking default assoc decls]</span></span>
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2479
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<pre style="margin: 0;">-<span id="LC2479" class="line" lang="haskell"> <span class="n" style="color: #333;">check_all_distinct_tvs</span> <span class="o" style="font-weight: 600;">::</span></span>
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2480
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<pre style="margin: 0;">-<span id="LC2480" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SDoc</span> <span class="c1" style="color: #998; font-style: italic;">-- The pretty-printed default equation (only used</span></span>
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2481
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<pre style="margin: 0;">-<span id="LC2481" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- for error message purposes)</span></span>
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<pre style="margin: 0;">-<span id="LC2482" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">ArgFlag</span><span class="p">)]</span> <span class="c1" style="color: #998; font-style: italic;">-- The type variable arguments in the associated</span></span>
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<pre style="margin: 0;">-<span id="LC2483" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- default declaration, along with their respective</span></span>
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2484
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<pre style="margin: 0;">-<span id="LC2484" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- visibilities (the latter are only used for error</span></span>
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2485
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<pre style="margin: 0;">-<span id="LC2485" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- message purposes)</span></span>
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2486
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<pre style="margin: 0;">-<span id="LC2486" 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="nb" style="color: #0086b3;">()</span></span>
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2487
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<pre style="margin: 0;">-<span id="LC2487" class="line" lang="haskell"> <span class="n" style="color: #333;">check_all_distinct_tvs</span> <span class="n" style="color: #333;">ppr_eqn</span> <span class="n" style="color: #333;">cpt_tvs_vis</span> <span class="o" style="font-weight: 600;">=</span></span>
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2488
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<pre style="margin: 0;">-<span id="LC2488" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">dups</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">findDupsEq</span> <span class="p">((</span><span class="o" style="font-weight: 600;">==</span><span class="p">)</span> <span class="p">`</span><span class="n" style="color: #333;">on</span><span class="p">`</span> <span class="n" style="color: #333;">fst</span><span class="p">)</span> <span class="n" style="color: #333;">cpt_tvs_vis</span> <span class="kr" style="font-weight: 600;">in</span></span>
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2489
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<pre style="margin: 0;">-<span id="LC2489" class="line" lang="haskell"> <span class="n" style="color: #333;">traverse_</span></span>
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2490
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<pre style="margin: 0;">-<span id="LC2490" class="line" lang="haskell"> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">d</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">pat_tv</span><span class="p">,</span> <span class="n" style="color: #333;">pat_vis</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NE</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">head</span> <span class="n" style="color: #333;">d</span> <span class="kr" style="font-weight: 600;">in</span> <span class="n" style="color: #333;">failWithTc</span> <span class="o" style="font-weight: 600;">$</span></span>
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2491
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<pre style="margin: 0;">-<span id="LC2491" class="line" lang="haskell"> <span class="n" style="color: #333;">pprWithExplicitKindsWhen</span> <span class="p">(</span><span class="n" style="color: #333;">isInvisibleArgFlag</span> <span class="n" style="color: #333;">pat_vis</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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2492
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<pre style="margin: 0;">-<span id="LC2492" class="line" lang="haskell"> <span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Illegal duplicate variable"</span></span>
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2493
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<pre style="margin: 0;">-<span id="LC2493" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">pat_tv</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;">"in:"</span><span class="p">)</span></span>
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2494
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<pre style="margin: 0;">-<span id="LC2494" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span><span class="n" style="color: #333;">ppr_eqn</span><span class="p">,</span> <span class="n" style="color: #333;">suggestion</span><span class="p">]))</span></span>
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2495
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<pre style="margin: 0;">-<span id="LC2495" class="line" lang="haskell"> <span class="n" style="color: #333;">dups</span></span>
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2496
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<pre style="margin: 0;">-<span id="LC2496" class="line" lang="haskell"></span>
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2497
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<pre style="margin: 0;">-<span id="LC2497" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr_default_eqn</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;">Type</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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2498
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<pre style="margin: 0;">-<span id="LC2498" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr_default_eqn</span> <span class="n" style="color: #333;">pats</span> <span class="n" style="color: #333;">rhs_ty</span> <span class="o" style="font-weight: 600;">=</span></span>
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2499
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<pre style="margin: 0;">-<span id="LC2499" class="line" lang="haskell"> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"type"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">pats</span><span class="p">)</span></span>
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2500
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<pre style="margin: 0;">-<span id="LC2500" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">equals</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">rhs_ty</span><span class="p">)</span></span>
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2501
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<pre style="margin: 0;">-<span id="LC2501" class="line" lang="haskell"></span>
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2502
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<pre style="margin: 0;">-<span id="LC2502" class="line" lang="haskell"> <span class="n" style="color: #333;">suggestion</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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2503
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<pre style="margin: 0;">-<span id="LC2503" class="line" lang="haskell"> <span class="n" style="color: #333;">suggestion</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"The arguments to"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fam_tc</span><span class="p">)</span></span>
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2504
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<pre style="margin: 0;">-<span id="LC2504" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"must all be distinct type variables"</span></span>
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2505
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<pre style="margin: 0;">-<span id="LC2505" class="line" lang="haskell"></span>
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2506
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2458
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<pre style="margin: 0;"> <span id="LC2458" class="line" lang="haskell"></span>
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2459
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<pre style="margin: 0;"> <span id="LC2459" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Type-checking default assoc decls]</span></span>
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2460
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<pre style="margin: 0;"> <span id="LC2460" 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">@@ -2513,24 +2465,29 @@ Consider this default declaration for an associated type</td>
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2513
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<pre style="margin: 0;"> <span id="LC2465" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type F (x :: j) y = Proxy x -> y</span></span>
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2514
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<pre style="margin: 0;"> <span id="LC2466" class="line" lang="haskell"></span>
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2515
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<pre style="margin: 0;"> <span id="LC2467" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that the class variable 'a' doesn't scope over the default assoc</span></span>
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2516
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<pre style="margin: 0;">-<span id="LC2516" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">decl (rather oddly I think), and (less oddly) neither does the second</span></span>
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<pre style="margin: 0;">-<span id="LC2517" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">argument 'b' of the associated type 'F', or the kind variable 'k'.</span></span>
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<pre style="margin: 0;">-<span id="LC2518" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Instead, the default decl is treated more like a top-level type</span></span>
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<pre style="margin: 0;">-<span id="LC2519" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">instance.</span></span>
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<pre style="margin: 0;">-<span id="LC2520" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2521" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">However we store the default rhs (Proxy x -> y) in F's TyCon, using</span></span>
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2522
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<pre style="margin: 0;">-<span id="LC2522" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">F's own type variables, so we need to convert it to (Proxy a -> b).</span></span>
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<pre style="margin: 0;">-<span id="LC2523" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We do this by creating a substitution [j |-> k, x |-> a, b |-> y] and</span></span>
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2524
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<pre style="margin: 0;">-<span id="LC2524" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">applying this substitution to the RHS.</span></span>
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<pre style="margin: 0;">+<span id="LC2468" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">decl, nor do the type variables `k` and `b`. Instead, the default decl is</span></span>
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<pre style="margin: 0;">+<span id="LC2469" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">treated more like a top-level type instance. However, we store the default rhs</span></span>
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<pre style="margin: 0;">+<span id="LC2470" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(Proxy x -> y) in F's TyCon, using F's own type variables, so we need to</span></span>
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<pre style="margin: 0;">+<span id="LC2471" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">convert it to (Proxy a -> b). We do this in the tcDefaultAssocDecl function by</span></span>
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<pre style="margin: 0;">+<span id="LC2472" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">creating a substitution [j |-> k, x |-> a, b |-> y] and applying this</span></span>
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2473
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<pre style="margin: 0;">+<span id="LC2473" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">substitution to the RHS.</span></span>
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2525
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2474
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<pre style="margin: 0;"> <span id="LC2474" class="line" lang="haskell"></span>
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2526
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2475
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<pre style="margin: 0;"> <span id="LC2475" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In order to create this substitution, we must first ensure that all of</span></span>
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2527
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2476
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<pre style="margin: 0;"> <span id="LC2476" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the arguments in the default instance consist of distinct type variables.</span></span>
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2528
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<pre style="margin: 0;">-<span id="LC2528" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">One might think that this is a simple task that could be implemented earlier</span></span>
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2529
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<pre style="margin: 0;">-<span id="LC2529" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in the compiler, perhaps in the parser or the renamer. However, there are some</span></span>
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2530
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<pre style="margin: 0;">-<span id="LC2530" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">tricky corner cases that really do require the full power of typechecking to</span></span>
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2531
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<pre style="margin: 0;">-<span id="LC2531" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">weed out, as the examples below should illustrate.</span></span>
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2477
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<pre style="margin: 0;">+<span id="LC2477" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Checking for this property proves surprisingly tricky. Three potential places</span></span>
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2478
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<pre style="margin: 0;">+<span id="LC2478" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">where GHC could check for this property include:</span></span>
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2479
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<pre style="margin: 0;">+<span id="LC2479" class="line" lang="haskell"></span>
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2480
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<pre style="margin: 0;">+<span id="LC2480" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">1. Before typechecking (in the parser or renamer)</span></span>
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2481
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<pre style="margin: 0;">+<span id="LC2481" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">2. During typechecking (in tcDefaultAssocDecl)</span></span>
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2482
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<pre style="margin: 0;">+<span id="LC2482" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">3. After typechecking (using GHC.Tc.Validity)</span></span>
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2483
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<pre style="margin: 0;">+<span id="LC2483" class="line" lang="haskell"></span>
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2484
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<pre style="margin: 0;">+<span id="LC2484" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Currently, GHC picks option (3) and implements this check using</span></span>
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2485
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<pre style="margin: 0;">+<span id="LC2485" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC.Tc.Validity.checkValidAssocTyFamDeflt. GHC previously used options (1) and</span></span>
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2486
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<pre style="margin: 0;">+<span id="LC2486" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(2), but neither option quite worked out for reasons that we will explain</span></span>
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2487
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<pre style="margin: 0;">+<span id="LC2487" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">shortly.</span></span>
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2532
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2488
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<pre style="margin: 0;"> <span id="LC2488" class="line" lang="haskell"></span>
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2533
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<pre style="margin: 0;">-<span id="LC2533" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">First, we must check that all arguments are type variables. As a motivating</span></span>
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2489
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<pre style="margin: 0;">+<span id="LC2489" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The first thing that checkValidAssocTyFamDeflt does is check that all arguments</span></span>
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2490
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<pre style="margin: 0;">+<span id="LC2490" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in an associated type family default are type variables. As a motivating</span></span>
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2534
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2491
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<pre style="margin: 0;"> <span id="LC2491" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">example, consider this erroneous program (inspired by #11361):</span></span>
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2535
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2492
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<pre style="margin: 0;"> <span id="LC2492" class="line" lang="haskell"></span>
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2536
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2493
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<pre style="margin: 0;"> <span id="LC2493" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> class C a where</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">@@ -2538,10 +2495,13 @@ example, consider this erroneous program (inspired by #11361):</td>
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2538
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2495
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<pre style="margin: 0;"> <span id="LC2495" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type F x b = x</span></span>
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2539
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2496
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<pre style="margin: 0;"> <span id="LC2496" class="line" lang="haskell"></span>
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2540
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2497
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<pre style="margin: 0;"> <span id="LC2497" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If you squint, you'll notice that the kind of `x` is actually Type. However,</span></span>
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2541
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<pre style="margin: 0;">-<span id="LC2541" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we cannot substitute from [Type |-> k], so we reject this default.</span></span>
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2498
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<pre style="margin: 0;">+<span id="LC2498" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we cannot substitute from [Type |-> k], so we reject this default. This also</span></span>
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2499
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<pre style="margin: 0;">+<span id="LC2499" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">explains why GHC no longer implements option (1) above, since figuring out that</span></span>
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2500
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<pre style="margin: 0;">+<span id="LC2500" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">`x`'s kind is Type would be much more difficult without the knowledge that the</span></span>
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2501
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<pre style="margin: 0;">+<span id="LC2501" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">typechecker provides.</span></span>
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2542
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2502
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<pre style="margin: 0;"> <span id="LC2502" class="line" lang="haskell"></span>
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2543
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<pre style="margin: 0;">-<span id="LC2543" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Next, <span class="idiff left right">we must check that all arguments are distinct. Here is another offending</span></span></span>
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2544
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<pre style="margin: 0;">-<span id="LC2544" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">example, this time taken from #13971:</span></span>
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2503
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<pre style="margin: 0;">+<span id="LC2503" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Next, <span class="idiff left right">checkValidAssocTyFamDeflt checks that all arguments are distinct. Here is</span></span></span>
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2504
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<pre style="margin: 0;">+<span id="LC2504" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">another offending </span>example, this time taken from #13971:</span></span>
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2545
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2505
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<pre style="margin: 0;"> <span id="LC2505" class="line" lang="haskell"></span>
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2546
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2506
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<pre style="margin: 0;"> <span id="LC2506" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> class C2 (a :: j) where</span></span>
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2547
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2507
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<pre style="margin: 0;"> <span id="LC2507" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type F2 (a :: j) (b :: k)</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2515" style="width: 35px; color: rgba(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">@@ -2555,10 +2515,37 @@ if we had written `type F2 @z @z x y = SameKind @z x y`, which makes it clear</td>
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2555
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2515
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<pre style="margin: 0;"> <span id="LC2515" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that we have duplicated a use of `z` on the LHS. Therefore, `F2`'s default is</span></span>
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2556
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2516
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<pre style="margin: 0;"> <span id="LC2516" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">also rejected.</span></span>
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2557
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2517
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<pre style="margin: 0;"> <span id="LC2517" class="line" lang="haskell"></span>
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2558
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<pre style="margin: 0;">-<span id="LC2558" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Since the LHS of an associated type family default is always just variables,</span></span>
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2559
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<pre style="margin: 0;">-<span id="LC2559" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">it won't contain any tycons. Accordingly, the patterns used in the substitution</span></span>
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2560
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<td class="diff-line-num new_line old" data-linenumber="2518" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC2560" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">won't actually be knot-tied, even though we're in the knot. This is too</span></span>
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2561
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<td class="diff-line-num new_line old" data-linenumber="2518" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
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<pre style="margin: 0;">-<span id="LC2561" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">delicate for my taste, but it works.</span></span>
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2518
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<pre style="margin: 0;">+<span id="LC2518" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">There is one more design consideration in play here: what error message should</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2519" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2519
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<pre style="margin: 0;">+<span id="LC2519" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">checkValidAssocTyFamDeflt produce if one of its checks fails? Ideally, it would</span></span>
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2520
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<pre style="margin: 0;">+<span id="LC2520" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">be something like this:</span></span>
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2521
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<pre style="margin: 0;">+<span id="LC2521" class="line" lang="haskell"></span>
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2522
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<pre style="margin: 0;">+<span id="LC2522" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Illegal duplicate variable ‘z’ in:</span></span>
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2523
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<pre style="margin: 0;">+<span id="LC2523" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ‘type F2 @z @z x y = ...’</span></span>
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2524
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<pre style="margin: 0;">+<span id="LC2524" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The arguments to ‘F2’ must all be distinct type variables</span></span>
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2525
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<pre style="margin: 0;">+<span id="LC2525" class="line" lang="haskell"></span>
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2526
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<pre style="margin: 0;">+<span id="LC2526" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This requires printing out the arguments to the associated type family. This</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2527" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2527
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<pre style="margin: 0;">+<span id="LC2527" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">can be dangerous, however. Consider this example, adapted from #18648:</span></span>
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2528
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<pre style="margin: 0;">+<span id="LC2528" class="line" lang="haskell"></span>
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2529
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<pre style="margin: 0;">+<span id="LC2529" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> class C3 a where</span></span>
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2530
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<pre style="margin: 0;">+<span id="LC2530" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type F3 a</span></span>
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2531
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<pre style="margin: 0;">+<span id="LC2531" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type F3 (F3 a) = a</span></span>
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2532
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<pre style="margin: 0;">+<span id="LC2532" class="line" lang="haskell"></span>
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2533
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<pre style="margin: 0;">+<span id="LC2533" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">F3's default is illegal, since its argument is not a bare type variable. But</span></span>
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2534
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<pre style="margin: 0;">+<span id="LC2534" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">note that when we typecheck F3's default, the F3 type constructor is knot-tied.</span></span>
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2535
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<pre style="margin: 0;">+<span id="LC2535" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Therefore, if we print the type `F3 a` in an error message, GHC will diverge!</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2536" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2536
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<pre style="margin: 0;">+<span id="LC2536" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This is the reason why GHC no longer implements option (2) above and instead</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2537" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
2537
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<pre style="margin: 0;">+<span id="LC2537" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">waits until /after/ typechecking has finished, at which point the typechecker</span></span>
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2538
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<pre style="margin: 0;">+<span id="LC2538" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">knot has been worked out.</span></span>
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2539
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<pre style="margin: 0;">+<span id="LC2539" class="line" lang="haskell"></span>
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2540
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<pre style="margin: 0;">+<span id="LC2540" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">As one final point, one might worry that the typechecker knot could cause the</span></span>
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2541
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<pre style="margin: 0;">+<span id="LC2541" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">substitution that tcDefaultAssocDecl creates to diverge, but this is not the</span></span>
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2542
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<pre style="margin: 0;">+<span id="LC2542" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">case. Since the LHS of a valid associated type family default is always just</span></span>
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2543
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<pre style="margin: 0;">+<span id="LC2543" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">variables, it won't contain any tycons. Accordingly, the patterns used in the</span></span>
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2544
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<pre style="margin: 0;">+<span id="LC2544" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">substitution won't actually be knot-tied, even though we're in the knot. (This</span></span>
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2545
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<pre style="margin: 0;">+<span id="LC2545" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is too delicate for my taste, but it works.) If we're dealing with /invalid/</span></span>
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2546
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<pre style="margin: 0;">+<span id="LC2546" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">default, such as F3's above, then we simply create an empty substitution and</span></span>
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2547
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<pre style="margin: 0;">+<span id="LC2547" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">rely on checkValidAssocTyFamDeflt throwing an error message afterwards before</span></span>
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2548
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<pre style="margin: 0;">+<span id="LC2548" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">any damage is done.</span></span>
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2562
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2549
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<pre style="margin: 0;"> <span id="LC2549" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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2563
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2550
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<pre style="margin: 0;"> <span id="LC2550" class="line" lang="haskell"></span>
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2551
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<pre style="margin: 0;"> <span id="LC2551" 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">@@ -4293,10 +4280,14 @@ checkValidClass cls</td>
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4293
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4280
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<pre style="margin: 0;"> <span id="LC4280" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- since there is no possible ambiguity (#10020)</span></span>
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4294
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4281
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<pre style="margin: 0;"> <span id="LC4281" class="line" lang="haskell"></span>
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4282
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<pre style="margin: 0;"> <span id="LC4282" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Check that any default declarations for associated types are valid</span></span>
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4296
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<pre style="margin: 0;">-<span id="LC4296" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">whenIsJust</span> <span class="n" style="color: #333;">m_dflt_rhs</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="p">(</span><span class="n" style="color: #333;">rhs</span><span class="p">,</span> <span class="n" style="color: #333;">loc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span></span>
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4297
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<pre style="margin: 0;">-<span id="LC4297" class="line" lang="haskell"> <span class="n" style="color: #333;">setSrcSpan</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">$</span></span>
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4298
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<pre style="margin: 0;">-<span id="LC4298" class="line" lang="haskell"> <span class="n" style="color: #333;">tcAddFamInstCtxt</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"default type instance"</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">getName</span> <span class="n" style="color: #333;">fam_tc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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4299
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<pre style="margin: 0;">-<span id="LC4299" class="line" lang="haskell"> <span class="n" style="color: #333;">checkValidTyFamEqn</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">fam_tvs</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyVarTys</span> <span class="n" style="color: #333;">fam_tvs</span><span class="p">)</span> <span class="n" style="color: #333;">rhs</span> <span class="p">}</span></span>
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4283
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<pre style="margin: 0;">+<span id="LC4283" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">whenIsJust</span> <span class="n" style="color: #333;">m_dflt_rhs</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="p">(</span><span class="n" style="color: #333;">rhs</span><span class="p">,</span> <span class="n" style="color: #333;">at_validity_info</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span></span>
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4284
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<pre style="margin: 0;">+<span id="LC4284" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">at_validity_info</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC4285" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NoATVI</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="nb" style="color: #0086b3;">()</span></span>
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4286
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<pre style="margin: 0;">+<span id="LC4286" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ATVI</span> <span class="n" style="color: #333;">loc</span> <span class="n" style="color: #333;">pats</span> <span class="o" style="font-weight: 600;">-></span></span>
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4287
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<pre style="margin: 0;">+<span id="LC4287" class="line" lang="haskell"> <span class="n" style="color: #333;">setSrcSpan</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">$</span></span>
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4288
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<pre style="margin: 0;">+<span id="LC4288" class="line" lang="haskell"> <span class="n" style="color: #333;">tcAddFamInstCtxt</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"default type instance"</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">getName</span> <span class="n" style="color: #333;">fam_tc</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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4289
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<pre style="margin: 0;">+<span id="LC4289" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">checkValidAssocTyFamDeflt</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">pats</span></span>
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4290
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<pre style="margin: 0;">+<span id="LC4290" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">checkValidTyFamEqn</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">fam_tvs</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyVarTys</span> <span class="n" style="color: #333;">fam_tvs</span><span class="p">)</span> <span class="n" style="color: #333;">rhs</span> <span class="p">}}</span></span>
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4291
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<pre style="margin: 0;"> <span id="LC4291" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC4292" class="line" lang="haskell"> <span class="n" style="color: #333;">fam_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyConTyVars</span> <span class="n" style="color: #333;">fam_tc</span></span>
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4302
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<pre style="margin: 0;"> <span id="LC4293" class="line" lang="haskell"></span>
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<li id="1db07ed8cd9bab6b217a8f5a140176d3cb8672fd">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/822f10575d207a2a47b21ac853dcf28c655041c4#1db07ed8cd9bab6b217a8f5a140176d3cb8672fd"><strong>compiler/GHC/Tc/Validity.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">@@ -14,7 +14,7 @@ module GHC.Tc.Validity (</td>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">checkValidInstance</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">checkValidInstHead</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">validDerivPred</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;">checkTySynRhs</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;">checkValidCoAxiom</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">checkValidCoAxBranch</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;">checkValidTyFamEqn</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">checkConsistentFamInst</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;">checkValidTyFamEqn</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">check<span class="idiff left">ValidAssocTyFamDeflt</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">check</span>ConsistentFamInst</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">badATErr</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">arityErr</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">checkTyConTelescope</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">allDistinctTyVars</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">@@ -73,6 +73,7 @@ import qualified GHC.LanguageExtensions as LangExt</td>
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<pre style="margin: 0;"> <span id="LC73" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC74" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Monad</span></span>
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<pre style="margin: 0;"> <span id="LC75" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Foldable</span></span>
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<pre style="margin: 0;">+<span id="LC76" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Function</span></span>
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76
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77
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<pre style="margin: 0;"> <span id="LC77" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.List</span> <span class="p">(</span> <span class="p">(</span><span class="o" style="font-weight: 600;">\\</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">nub</span> <span class="p">)</span></span>
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77
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<pre style="margin: 0;"> <span id="LC78" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="k" style="font-weight: 600;">qualified</span> <span class="nn" style="color: #555;">Data.List.NonEmpty</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">NE</span></span>
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79
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<pre style="margin: 0;"> <span id="LC79" 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">@@ -2117,6 +2118,68 @@ checkValidTyFamEqn fam_tc qvs typats rhs</td>
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2117
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2118
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<pre style="margin: 0;"> <span id="LC2118" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">unless</span> <span class="n" style="color: #333;">undecidable_ok</span> <span class="o" style="font-weight: 600;">$</span></span>
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2118
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2119
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<pre style="margin: 0;"> <span id="LC2119" class="line" lang="haskell"> <span class="n" style="color: #333;">mapM_</span> <span class="n" style="color: #333;">addErrTc</span> <span class="p">(</span><span class="n" style="color: #333;">checkFamInstRhs</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">typats</span> <span class="p">(</span><span class="n" style="color: #333;">tcTyFamInsts</span> <span class="n" style="color: #333;">rhs</span><span class="p">))</span> <span class="p">}</span></span>
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2119
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2120
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<pre style="margin: 0;"> <span id="LC2120" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2121" class="line" lang="haskell"><span class="cd">-- | Checks that an associated type family default:</span></span>
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2122
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<pre style="margin: 0;">+<span id="LC2122" 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="LC2123" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 1. Only consists of arguments that are bare type variables, and</span></span>
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2124
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<pre style="margin: 0;">+<span id="LC2124" 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="LC2125" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 2. Has a distinct type variable in each argument.</span></span>
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2126
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<pre style="margin: 0;">+<span id="LC2126" 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="LC2127" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See @Note [Type-checking default assoc decls]@ in "GHC.Tc.TyCl".</span></span>
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<pre style="margin: 0;">+<span id="LC2128" class="line" lang="haskell"><span class="n" style="color: #333;">checkValidAssocTyFamDeflt</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TyCon</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ of the type family</span></span>
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<pre style="margin: 0;">+<span id="LC2129" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Type patterns</span></span>
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<pre style="margin: 0;">+<span id="LC2130" 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="nb" style="color: #0086b3;">()</span></span>
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2131
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<pre style="margin: 0;">+<span id="LC2131" class="line" lang="haskell"><span class="n" style="color: #333;">checkValidAssocTyFamDeflt</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">pats</span> <span class="o" style="font-weight: 600;">=</span></span>
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2132
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<pre style="margin: 0;">+<span id="LC2132" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">cpt_tvs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zipWithM</span> <span class="n" style="color: #333;">extract_tv</span> <span class="n" style="color: #333;">pats</span> <span class="n" style="color: #333;">pats_vis</span></span>
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2133
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<pre style="margin: 0;">+<span id="LC2133" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">check_all_distinct_tvs</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">zip</span> <span class="n" style="color: #333;">cpt_tvs</span> <span class="n" style="color: #333;">pats_vis</span> <span class="p">}</span></span>
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2134
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<pre style="margin: 0;">+<span id="LC2134" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2135
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<pre style="margin: 0;">+<span id="LC2135" class="line" lang="haskell"> <span class="n" style="color: #333;">pats_vis</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">ArgFlag</span><span class="p">]</span></span>
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2136
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<pre style="margin: 0;">+<span id="LC2136" class="line" lang="haskell"> <span class="n" style="color: #333;">pats_vis</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyConArgFlags</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">pats</span></span>
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2137
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<pre style="margin: 0;">+<span id="LC2137" class="line" lang="haskell"></span>
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2138
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<pre style="margin: 0;">+<span id="LC2138" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Checks that a pattern on the LHS of a default is a type</span></span>
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2139
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<pre style="margin: 0;">+<span id="LC2139" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- variable. If so, return the underlying type variable, and if</span></span>
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2140
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<pre style="margin: 0;">+<span id="LC2140" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- not, throw an error.</span></span>
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2141
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<pre style="margin: 0;">+<span id="LC2141" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Type-checking default assoc decls]</span></span>
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2142
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<pre style="margin: 0;">+<span id="LC2142" class="line" lang="haskell"> <span class="n" style="color: #333;">extract_tv</span> <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;">-- The particular type pattern from which to extract</span></span>
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2143
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<pre style="margin: 0;">+<span id="LC2143" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- its underlying type variable</span></span>
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2144
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<pre style="margin: 0;">+<span id="LC2144" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ArgFlag</span> <span class="c1" style="color: #998; font-style: italic;">-- The visibility of the type pattern</span></span>
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2145
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<pre style="margin: 0;">+<span id="LC2145" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (only used for error message purposes)</span></span>
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2146
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<pre style="margin: 0;">+<span id="LC2146" 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;">TyVar</span></span>
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2147
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<pre style="margin: 0;">+<span id="LC2147" class="line" lang="haskell"> <span class="n" style="color: #333;">extract_tv</span> <span class="n" style="color: #333;">pat</span> <span class="n" style="color: #333;">pat_vis</span> <span class="o" style="font-weight: 600;">=</span></span>
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2148
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<pre style="margin: 0;">+<span id="LC2148" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">getTyVar_maybe</span> <span class="n" style="color: #333;">pat</span> <span class="kr" style="font-weight: 600;">of</span></span>
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2149
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<pre style="margin: 0;">+<span id="LC2149" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="n" style="color: #333;">tv</span></span>
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2150
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<pre style="margin: 0;">+<span id="LC2150" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">failWithTc</span> <span class="o" style="font-weight: 600;">$</span></span>
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2151
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<pre style="margin: 0;">+<span id="LC2151" class="line" lang="haskell"> <span class="n" style="color: #333;">pprWithExplicitKindsWhen</span> <span class="p">(</span><span class="n" style="color: #333;">isInvisibleArgFlag</span> <span class="n" style="color: #333;">pat_vis</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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2152
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<pre style="margin: 0;">+<span id="LC2152" class="line" lang="haskell"> <span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Illegal argument"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">pat</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;">"in:"</span><span class="p">)</span></span>
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2153
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<pre style="margin: 0;">+<span id="LC2153" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span><span class="n" style="color: #333;">ppr_eqn</span><span class="p">,</span> <span class="n" style="color: #333;">suggestion</span><span class="p">])</span></span>
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2154
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<pre style="margin: 0;">+<span id="LC2154" class="line" lang="haskell"></span>
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2155
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<pre style="margin: 0;">+<span id="LC2155" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Checks that no type variables in an associated default declaration are</span></span>
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2156
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<pre style="margin: 0;">+<span id="LC2156" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- duplicated. If that is the case, throw an error.</span></span>
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2157
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<pre style="margin: 0;">+<span id="LC2157" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Type-checking default assoc decls]</span></span>
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2158
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<pre style="margin: 0;">+<span id="LC2158" class="line" lang="haskell"> <span class="n" style="color: #333;">check_all_distinct_tvs</span> <span class="o" style="font-weight: 600;">::</span></span>
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2159
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<pre style="margin: 0;">+<span id="LC2159" class="line" lang="haskell"> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">TyVar</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">ArgFlag</span><span class="p">)]</span> <span class="c1" style="color: #998; font-style: italic;">-- The type variable arguments in the associated</span></span>
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2160
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<pre style="margin: 0;">+<span id="LC2160" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- default declaration, along with their respective</span></span>
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2161
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<pre style="margin: 0;">+<span id="LC2161" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- visibilities (the latter are only used for error</span></span>
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2162
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<pre style="margin: 0;">+<span id="LC2162" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- message purposes)</span></span>
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2163
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<pre style="margin: 0;">+<span id="LC2163" 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="nb" style="color: #0086b3;">()</span></span>
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2164
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<pre style="margin: 0;">+<span id="LC2164" class="line" lang="haskell"> <span class="n" style="color: #333;">check_all_distinct_tvs</span> <span class="n" style="color: #333;">cpt_tvs_vis</span> <span class="o" style="font-weight: 600;">=</span></span>
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2165
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<pre style="margin: 0;">+<span id="LC2165" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">dups</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">findDupsEq</span> <span class="p">((</span><span class="o" style="font-weight: 600;">==</span><span class="p">)</span> <span class="p">`</span><span class="n" style="color: #333;">on</span><span class="p">`</span> <span class="n" style="color: #333;">fst</span><span class="p">)</span> <span class="n" style="color: #333;">cpt_tvs_vis</span> <span class="kr" style="font-weight: 600;">in</span></span>
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2166
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<pre style="margin: 0;">+<span id="LC2166" class="line" lang="haskell"> <span class="n" style="color: #333;">traverse_</span></span>
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2167
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<pre style="margin: 0;">+<span id="LC2167" class="line" lang="haskell"> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">d</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">let</span> <span class="p">(</span><span class="n" style="color: #333;">pat_tv</span><span class="p">,</span> <span class="n" style="color: #333;">pat_vis</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NE</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">head</span> <span class="n" style="color: #333;">d</span> <span class="kr" style="font-weight: 600;">in</span> <span class="n" style="color: #333;">failWithTc</span> <span class="o" style="font-weight: 600;">$</span></span>
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2168
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<pre style="margin: 0;">+<span id="LC2168" class="line" lang="haskell"> <span class="n" style="color: #333;">pprWithExplicitKindsWhen</span> <span class="p">(</span><span class="n" style="color: #333;">isInvisibleArgFlag</span> <span class="n" style="color: #333;">pat_vis</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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2169
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<pre style="margin: 0;">+<span id="LC2169" class="line" lang="haskell"> <span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Illegal duplicate variable"</span></span>
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2170
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<pre style="margin: 0;">+<span id="LC2170" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">pat_tv</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;">"in:"</span><span class="p">)</span></span>
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2171
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<pre style="margin: 0;">+<span id="LC2171" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">vcat</span> <span class="p">[</span><span class="n" style="color: #333;">ppr_eqn</span><span class="p">,</span> <span class="n" style="color: #333;">suggestion</span><span class="p">]))</span></span>
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2172
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<pre style="margin: 0;">+<span id="LC2172" class="line" lang="haskell"> <span class="n" style="color: #333;">dups</span></span>
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2173
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<pre style="margin: 0;">+<span id="LC2173" class="line" lang="haskell"></span>
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2174
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<pre style="margin: 0;">+<span id="LC2174" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr_eqn</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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2175
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<pre style="margin: 0;">+<span id="LC2175" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr_eqn</span> <span class="o" style="font-weight: 600;">=</span></span>
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2176
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<pre style="margin: 0;">+<span id="LC2176" class="line" lang="haskell"> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"type"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">pats</span><span class="p">)</span></span>
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2177
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<pre style="margin: 0;">+<span id="LC2177" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">equals</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"..."</span><span class="p">)</span></span>
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2178
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<pre style="margin: 0;">+<span id="LC2178" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2179" class="line" lang="haskell"> <span class="n" style="color: #333;">suggestion</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="LC2180" class="line" lang="haskell"> <span class="n" style="color: #333;">suggestion</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"The arguments to"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">quotes</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">fam_tc</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2181" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"must all be distinct type variables"</span></span>
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<pre style="margin: 0;">+<span id="LC2182" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2183" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Make sure that each type family application is</span></span>
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2184
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<pre style="margin: 0;"> <span id="LC2184" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (1) strictly smaller than the lhs,</span></span>
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2185
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<pre style="margin: 0;"> <span id="LC2185" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (2) mentions no type variable more often than the lhs, and</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/822f10575d207a2a47b21ac853dcf28c655041c4#0942e35743c77f939f29199ed453d13b576a52e9"><strong>testsuite/tests/indexed-types/should_compile/T11361a.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">T11361a.hs:7:3: error:</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> • Illegal argument ‘*’ in:</span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> ‘type F @(*) x = <span class="idiff left right">x</span>’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> ‘type F @(*) x = <span class="idiff left right">...</span>’</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> The arguments to ‘F’ must all be distinct type variables</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> • In the default type instance declaration for ‘F’</span>
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<pre style="margin: 0;"> <span id="LC7" 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/822f10575d207a2a47b21ac853dcf28c655041c4#f5b2262300e77de7b0dbf5f0bd21be0a48df6f4f"><strong>testsuite/tests/indexed-types/should_fail/SimpleFail4.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">SimpleFail4.hs:10:3: error:</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> • Illegal argument ‘Int’ in:</span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> ‘type S2 Int = <span class="idiff left right">Char</span>’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> ‘type S2 Int = <span class="idiff left right">...</span>’</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> The arguments to ‘S2’ must all be distinct type variables</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> • In the default type instance declaration for ‘S2’</span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext"> In the class declaration for ‘C2’</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/822f10575d207a2a47b21ac853dcf28c655041c4#69edc75f6597d0874498e964811e0c9ea4b7b1ef"><strong>testsuite/tests/indexed-types/should_fail/T13971.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">T13971.hs:7:3: error:</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> • Illegal argument ‘*’ in:</span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> ‘type T @{k} @(*) a = <span class="idiff left right">Int</span>’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> ‘type T @{k} @(*) a = <span class="idiff left right">...</span>’</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> The arguments to ‘T’ must all be distinct type variables</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> • In the default type instance declaration for ‘T’</span>
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<pre style="margin: 0;"> <span id="LC7" 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/822f10575d207a2a47b21ac853dcf28c655041c4#ad0b4d579659de4effeafb89612694d8b6b98bf6"><strong>testsuite/tests/indexed-types/should_fail/T13971b.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">T13971b.hs:9:3: error:</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> • Illegal duplicate variable ‘k’ in:</span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> ‘type T @k @k a b = <span class="idiff left right">k</span>’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> ‘type T @k @k a b = <span class="idiff left right">...</span>’</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> The arguments to ‘T’ must all be distinct type variables</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> • In the default type instance declaration for ‘T’</span>
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<pre style="margin: 0;"> <span id="LC7" 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/822f10575d207a2a47b21ac853dcf28c655041c4#a605ff400901085182447c89828b2de1a5dbb0f6"><strong>testsuite/tests/indexed-types/should_fail/T16110_Fail2.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">T16110_Fail2.hs:9:3: error:</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> • Illegal duplicate variable ‘b’ in:</span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> ‘type T a b b = <span class="idiff left right">Int</span>’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> ‘type T a b b = <span class="idiff left right">...</span>’</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> The arguments to ‘T’ must all be distinct type variables</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> • In the default type instance declaration for ‘T’</span>
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<pre style="margin: 0;"> <span id="LC7" 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/822f10575d207a2a47b21ac853dcf28c655041c4#e88311a0cc719a5d07f737b9fa0a0b5bd6b4e938"><strong>testsuite/tests/indexed-types/should_fail/T16110_Fail3.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">T16110_Fail3.hs:11:3: error:</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> • Illegal argument ‘Int’ in:</span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> ‘type T a Int = <span class="idiff left right">Int</span>’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> ‘type T a Int = <span class="idiff left right">...</span>’</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> The arguments to ‘T’ must all be distinct type variables</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> • In the default type instance declaration for ‘T’</span>
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<pre style="margin: 0;"> <span id="LC7" 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/822f10575d207a2a47b21ac853dcf28c655041c4#0509b890ea835e45302350905e2fbc28d868c7d5"><strong>testsuite/tests/indexed-types/should_fail/T16356_Fail1.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">T16356_Fail1.hs:10:3: error:</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> • Illegal argument ‘*’ in:</span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> ‘type T @(*) a = <span class="idiff left right">Maybe a</span>’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> ‘type T @(*) a = <span class="idiff left right">...</span>’</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> The arguments to ‘T’ must all be distinct type variables</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> • In the default type instance declaration for ‘T’</span>
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<pre style="margin: 0;"> <span id="LC7" 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/822f10575d207a2a47b21ac853dcf28c655041c4#8029ad8879e2eade66ead20902b7f97ae4966d6d"><strong>testsuite/tests/indexed-types/should_fail/T16356_Fail2.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">T16356_Fail2.hs:8:3: error:</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> • Illegal duplicate variable ‘k’ in:</span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> ‘type T @k @k a b = <span class="idiff left right">k</span>’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> ‘type T @k @k a b = <span class="idiff left right">...</span>’</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> The arguments to ‘T’ must all be distinct type variables</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> • In the default type instance declaration for ‘T’</span>
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<pre style="margin: 0;"> <span id="LC7" 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/822f10575d207a2a47b21ac853dcf28c655041c4#5466b7f8753a781e231b5cafad858c193b9f8dfe"><strong>testsuite/tests/indexed-types/should_fail/T18648.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 TypeFamilies #-}</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;">T18648</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;">class</span> <span class="kt" style="color: #458; font-weight: 600;">Foo1</span> <span class="n" style="color: #333;">a</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">Bar1</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">Bar1</span> <span class="p">(</span><span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Bar1</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">Foo2</span> <span class="n" style="color: #333;">a</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">Bar2</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">Bar2</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Bar2</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">a</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/822f10575d207a2a47b21ac853dcf28c655041c4#c2fcda265b5450370758d78c30a59f775f1b1b26"><strong>testsuite/tests/indexed-types/should_fail/T18648.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T18648.hs:6:4: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Illegal argument ‘f a’ in:</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> ‘type Bar1 (f a) = ...’</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> The arguments to ‘Bar1’ must all be distinct type variables</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> • In the default type instance declaration for ‘Bar1’</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> In the class declaration for ‘Foo1’</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext">T18648.hs:10:4: error:</span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext"> • Illegal argument ‘Bar2 a’ in:</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext"> ‘type Bar2 (Bar2 a) = ...’</span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext"> The arguments to ‘Bar2’ must all be distinct type variables</span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext"> • In the default type instance declaration for ‘Bar2’</span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext"> In the class declaration for ‘Foo2’</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/822f10575d207a2a47b21ac853dcf28c655041c4#3e0457789f3266c805563b6a84cef1dfb08aed7e"><strong>testsuite/tests/indexed-types/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">@@ -162,3 +162,4 @@ test('T16356_Fail3', normal, compile_fail, [''])</td>
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162
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162
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<pre style="margin: 0;"> <span id="LC162" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17008a</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">-fprint-explicit-kinds</span><span class="p">'])</span></span>
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163
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163
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<pre style="margin: 0;"> <span id="LC163" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T13571</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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164
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164
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<pre style="margin: 0;"> <span id="LC164" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T13571a</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">+<span id="LC165" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18648</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/822f10575d207a2a47b21ac853dcf28c655041c4#dba733963d9a087722ebf0b37d43aa7dc7748c35"><strong>testsuite/tests/typecheck/should_fail/AssocTyDef02.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">AssocTyDef02.hs:6:5: error:</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> • Illegal argument ‘[b]’ in:</span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> ‘type Typ [b] = <span class="idiff left right">Int</span>’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> ‘type Typ [b] = <span class="idiff left right">...</span>’</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> The arguments to ‘Typ’ must all be distinct type variables</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> • In the default type instance declaration for ‘Typ’</span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext"> In the class declaration for ‘Cls’</span></pre>
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