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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/78a5c4ce6bae233b655097ada3901028104f0f27">78a5c4ce</a></strong>

<div>

<span>by Ryan Scott</span>

<i>at 2019-05-07T21:03:04Z</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Check for duplicate variables in associated default equations

A follow-up to !696's, which attempted to clean up the error messages

for ill formed associated type family default equations. The previous

attempt, !696, forgot to account for the possibility of duplicate

kind variable arguments, as in the following example:

```hs

class C (a :: j) where

  type T (a :: j) (b :: k)

  type T (a :: k) (b :: k) = k

```

This patch addresses this shortcoming by adding an additional check

for this. Fixes #13971 (hopefully for good this time).

</pre>

</li>

</ul>

<h4>6 changed files:</h4>

<ul>

<li class="file-stats">

<a href="#bdfa0cc139f61d1236abc1598c5d684b43c357f9">

compiler/typecheck/TcTyClsDecls.hs

</a>

</li>

<li class="file-stats">

<a href="#0942e35743c77f939f29199ed453d13b576a52e9">

testsuite/tests/indexed-types/should_compile/T11361a.stderr

</a>

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<li class="file-stats">

<a href="#69edc75f6597d0874498e964811e0c9ea4b7b1ef">

testsuite/tests/indexed-types/should_fail/T13971.stderr

</a>

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<li class="file-stats">

<a href="#a94def664ac811d2b4ab866516c8e7dc97cbfa9e">

<span class="new-file">

+

testsuite/tests/indexed-types/should_fail/T13971b.hs

</span>

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<li class="file-stats">

<a href="#ad0b4d579659de4effeafb89612694d8b6b98bf6">

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+

testsuite/tests/indexed-types/should_fail/T13971b.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>

</ul>

<h4>Changes:</h4>

<li id="bdfa0cc139f61d1236abc1598c5d684b43c357f9">

<a href="https://gitlab.haskell.org/ghc/ghc/commit/78a5c4ce6bae233b655097ada3901028104f0f27#bdfa0cc139f61d1236abc1598c5d684b43c357f9"><strong>compiler/typecheck/TcTyClsDecls.hs</strong></a>

<hr>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="73" style="width: 35px; color: rgba(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="73" style="width: 35px; color: rgba(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">@@ -73,7 +73,9 @@ import BasicTypes</td>

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73

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<pre style="margin: 0;"> <span id="LC73" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="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="LC74" class="line" lang="haskell"></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;">Control.Monad</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.Foldable</span></span>

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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>

</pre>

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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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<pre style="margin: 0;"> <span id="LC79" 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>

</pre>

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<pre style="margin: 0;"> <span id="LC80" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="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>

</pre>

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<pre style="margin: 0;"> <span id="LC81" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1544" style="width: 35px; color: rgba(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="1546" style="width: 35px; color: rgba(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">@@ -1544,13 +1546,15 @@ tcDefaultAssocDecl fam_tc [dL->L loc (FamEqn { feqn_tycon = L _ tc_name</td>

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<pre style="margin: 0;"> <span id="LC1546" 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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<td class="diff-line-num old_line" data-linenumber="1545" style="width: 35px; color: rgba(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="1547" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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

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<td class="diff-line-num old_line" data-linenumber="1546" style="width: 35px; color: rgba(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="1548" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

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<pre style="margin: 0;"> <span id="LC1548" 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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<td class="diff-line-num new new_line" data-linenumber="1549" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC1549" 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="LC1550" 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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1548

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

1551

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<pre style="margin: 0;"> <span id="LC1551" 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>

</pre>

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1549

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<td class="diff-line-num new_line" data-linenumber="1552" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1552

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<pre style="margin: 0;"> <span id="LC1552" 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>

</pre>

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

1550

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

1553

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<pre style="margin: 0;"> <span id="LC1553" class="line" lang="haskell">           <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"pats"</span>    <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">pats</span></span>

</pre>

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1551

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

1554

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<pre style="margin: 0;"> <span id="LC1554" class="line" lang="haskell">           <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"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;">rhs_ty</span></span>

</pre>

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1552

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

1555

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<pre style="margin: 0;"> <span id="LC1555" class="line" lang="haskell">           <span class="p">])</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1553" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

1553

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<td class="diff-line-num new_line old" data-linenumber="1556" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC1553" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">pat_tvs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">traverse</span> <span class="p">(</span><span class="n" style="color: #333;">extract_tv</span> <span class="n" style="color: #333;">pats</span> <span class="n" style="color: #333;">rhs_ty</span><span class="p">)</span> <span class="n" style="color: #333;">pats</span></span>

</pre>

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

1556

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<pre style="margin: 0;">+<span id="LC1556" class="line" lang="haskell">       <span class="p">;</span> <span class="n" style="color: #333;">pat_tvs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">traverse</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>

</pre>

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

</td>

<td class="diff-line-num new new_line" data-linenumber="1557" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1557

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<pre style="margin: 0;">+<span id="LC1557" 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="n" style="color: #333;">pat_tvs</span></span>

</pre>

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1554

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

1558

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<pre style="margin: 0;"> <span id="LC1558" 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;">pat_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>

</pre>

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

1555

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<td class="diff-line-num new_line" data-linenumber="1559" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1559

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<pre style="margin: 0;"> <span id="LC1559" 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>

</pre>

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1556

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<td class="diff-line-num new_line" data-linenumber="1560" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1560

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<pre style="margin: 0;"> <span id="LC1560" 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>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1561" style="width: 35px; color: rgba(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="1565" style="width: 35px; color: rgba(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">@@ -1561,14 +1565,12 @@ tcDefaultAssocDecl fam_tc [dL->L loc (FamEqn { feqn_tycon = L _ tc_name</td>

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<pre style="margin: 0;"> <span id="LC1565" 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>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1562" style="width: 35px; color: rgba(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="1566" style="width: 35px; color: rgba(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="LC1566" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- not, throw an error.</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1563" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1563

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<td class="diff-line-num new_line" data-linenumber="1567" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1567

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<pre style="margin: 0;"> <span id="LC1567" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- See Note [Type-checking default assoc decls]</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1564" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

1564

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<td class="diff-line-num new_line old" data-linenumber="1568" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC1564" class="line" lang="haskell">    <span class="n" style="color: #333;">extract_tv</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="c1" style="color: #998; font-style: italic;">-- All default instance type patterns</span></span>

</pre>

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1565

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<pre style="margin: 0;">-<span id="LC1565" class="line" lang="haskell">                         <span class="c1" style="color: #998; font-style: italic;">-- (only used for error message purposes)</span></span>

</pre>

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1566

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<pre style="margin: 0;">-<span id="LC1566" 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 default instance's right-hand side type</span></span>

</pre>

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</td>

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1568

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<pre style="margin: 0;">+<span id="LC1568" 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>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1567" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1567

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<td class="diff-line-num new_line" data-linenumber="1569" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1569

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<pre style="margin: 0;"> <span id="LC1569" class="line" lang="haskell">                         <span class="c1" style="color: #998; font-style: italic;">-- (only used for error message purposes)</span></span>

</pre>

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1568

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<td class="diff-line-num new_line" data-linenumber="1570" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1570

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<pre style="margin: 0;"> <span id="LC1570" 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>

</pre>

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1569

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<td class="diff-line-num new_line" data-linenumber="1571" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1571

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<pre style="margin: 0;"> <span id="LC1571" class="line" lang="haskell">                         <span class="c1" style="color: #998; font-style: italic;">-- its underlying type variable</span></span>

</pre>

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1570

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<td class="diff-line-num new_line" data-linenumber="1572" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1572

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<pre style="margin: 0;"> <span id="LC1572" 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>

</pre>

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1571

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<td class="diff-line-num new_line old" data-linenumber="1573" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC1571" class="line" lang="haskell">    <span class="n" style="color: #333;">extract_tv</span> <span class="n" style="color: #333;">p<span class="idiff left">ats</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">rhs_ty</span></span> <span class="n" style="color: #333;">pat</span> <span class="o" style="font-weight: 600;">=</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="1573" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1573

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<pre style="margin: 0;">+<span id="LC1573" class="line" lang="haskell">    <span class="n" style="color: #333;">extract_tv</span> <span class="n" style="color: #333;">p<span class="idiff left right">pr_eqn</span></span> <span class="n" style="color: #333;">pat</span> <span class="o" style="font-weight: 600;">=</span></span>

</pre>

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1572

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<td class="diff-line-num new_line" data-linenumber="1574" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1574

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<pre style="margin: 0;"> <span id="LC1574" 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>

</pre>

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1573

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<td class="diff-line-num new_line" data-linenumber="1575" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1575

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<pre style="margin: 0;"> <span id="LC1575" 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>

</pre>

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1574

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<td class="diff-line-num new_line" data-linenumber="1576" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1576

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<pre style="margin: 0;"> <span id="LC1576" class="line" lang="haskell">        <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1579" style="width: 35px; color: rgba(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="1581" style="width: 35px; color: rgba(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">@@ -1579,10 +1581,39 @@ tcDefaultAssocDecl fam_tc [dL->L loc (FamEqn { feqn_tycon = L _ tc_name</td>

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1579

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1581

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<pre style="margin: 0;"> <span id="LC1581" class="line" lang="haskell">          <span class="c1" style="color: #998; font-style: italic;">-- error message with -fprint-explicit-kinds enabled.</span></span>

</pre>

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1580

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<td class="diff-line-num new_line" data-linenumber="1582" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1582

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<pre style="margin: 0;"> <span id="LC1582" class="line" lang="haskell">          <span class="n" style="color: #333;">failWithTc</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">pprWithExplicitKindsWhen</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="o" style="font-weight: 600;">$</span></span>

</pre>

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1581

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<td class="diff-line-num new_line" data-linenumber="1583" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1583

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<pre style="margin: 0;"> <span id="LC1583" 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>

</pre>

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1582

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<td class="diff-line-num new_line old" data-linenumber="1584" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC1582" 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;">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>

</pre>

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1583

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<td class="diff-line-num new_line old" data-linenumber="1584" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC1583" 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>

</pre>

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1584

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<pre style="margin: 0;">-<span id="LC1584" class="line" lang="haskell">                     <span class="p">,</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>

</pre>

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1585

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<pre style="margin: 0;">-<span id="LC1585" 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 type variables"</span> <span class="p">])</span></span>

</pre>

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1584

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<pre style="margin: 0;">+<span id="LC1584" 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>

</pre>

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1585

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<pre style="margin: 0;">+<span id="LC1585" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="1586" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1586

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<pre style="margin: 0;">+<span id="LC1586" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1586" style="width: 35px; color: rgba(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="1587" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1587

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<pre style="margin: 0;">+<span id="LC1587" 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>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="1588" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1588

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<pre style="margin: 0;">+<span id="LC1588" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- duplicated. If that is the case, throw an error.</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="1589" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1589

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<pre style="margin: 0;">+<span id="LC1589" class="line" lang="haskell">    <span class="c1" style="color: #998; font-style: italic;">-- See Note [Type-checking default assoc decls]</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="1590" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1590

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<pre style="margin: 0;">+<span id="LC1590" class="line" lang="haskell">    <span class="n" style="color: #333;">check_all_distinct_tvs</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>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="1591" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1591

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<pre style="margin: 0;">+<span id="LC1591" class="line" lang="haskell">                                      <span class="c1" style="color: #998; font-style: italic;">-- (only used for error message purposes)</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="1592" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1592

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<pre style="margin: 0;">+<span id="LC1592" 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="c1" style="color: #998; font-style: italic;">-- The type variable arguments in the</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="1593" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1593

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<pre style="margin: 0;">+<span id="LC1593" class="line" lang="haskell">                                      <span class="c1" style="color: #998; font-style: italic;">-- associated default declaration</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="1594" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1594

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<pre style="margin: 0;">+<span id="LC1594" 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>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="1595" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1595

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<pre style="margin: 0;">+<span id="LC1595" 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;">tvs</span> <span class="o" style="font-weight: 600;">=</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="1596" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1596

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<pre style="margin: 0;">+<span id="LC1596" 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="n" style="color: #333;">tvs</span> <span class="kr" style="font-weight: 600;">in</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="1597" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1597

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<pre style="margin: 0;">+<span id="LC1597" class="line" lang="haskell">      <span class="n" style="color: #333;">traverse_</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="1598" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1598

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<pre style="margin: 0;">+<span id="LC1598" 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="c1" style="color: #998; font-style: italic;">-- Per Note [Type-checking default assoc decls], we already</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="1599" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1599

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<pre style="margin: 0;">+<span id="LC1599" class="line" lang="haskell">               <span class="c1" style="color: #998; font-style: italic;">-- know by this point that if any arguments in the default</span></span>

</pre>

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</td>

<td class="diff-line-num new new_line" data-linenumber="1600" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1600

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<pre style="margin: 0;">+<span id="LC1600" class="line" lang="haskell">               <span class="c1" style="color: #998; font-style: italic;">-- instance are duplicates, then they must be</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1586" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1601" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1601

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<pre style="margin: 0;">+<span id="LC1601" class="line" lang="haskell">               <span class="c1" style="color: #998; font-style: italic;">-- invisible kind arguments. Therefore, always display the</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1586" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1602" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1602

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<pre style="margin: 0;">+<span id="LC1602" class="line" lang="haskell">               <span class="c1" style="color: #998; font-style: italic;">-- error message with -fprint-explicit-kinds enabled.</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1586" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1603" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1603

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<pre style="margin: 0;">+<span id="LC1603" class="line" lang="haskell">               <span class="n" style="color: #333;">failWithTc</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">pprWithExplicitKindsWhen</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="o" style="font-weight: 600;">$</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1586" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1604" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1604

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<pre style="margin: 0;">+<span id="LC1604" 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>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1586" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1605" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1605

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<pre style="margin: 0;">+<span id="LC1605" 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="p">(</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="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>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1586" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1606" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1606

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<pre style="margin: 0;">+<span id="LC1606" 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>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1586" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1607" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1607

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<pre style="margin: 0;">+<span id="LC1607" class="line" lang="haskell">        <span class="n" style="color: #333;">dups</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1586" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1608" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1608

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<pre style="margin: 0;">+<span id="LC1608" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1586" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1609" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1609

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<pre style="margin: 0;">+<span id="LC1609" 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>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1586" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1610" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1610

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<pre style="margin: 0;">+<span id="LC1610" 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>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1586" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1611" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1611

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<pre style="margin: 0;">+<span id="LC1611" 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>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1586" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1612" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1612

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<pre style="margin: 0;">+<span id="LC1612" 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>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1586" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1613" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1613

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<pre style="margin: 0;">+<span id="LC1613" class="line" lang="haskell"></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1586" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1614" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1614

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<pre style="margin: 0;">+<span id="LC1614" 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>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1586" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1615" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1615

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<pre style="margin: 0;">+<span id="LC1615" 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>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1586" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1616" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1616

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<pre style="margin: 0;">+<span id="LC1616" 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>

</pre>

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1586

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1617

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<pre style="margin: 0;"> <span id="LC1617" class="line" lang="haskell"><span class="n" style="color: #333;">tcDefaultAssocDecl</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">[</span><span class="n" style="color: #333;">dL</span><span class="o" style="font-weight: 600;">-></span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XFamEqn</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)]</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"tcDefaultAssocDecl"</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1587" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1587

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<td class="diff-line-num new_line" data-linenumber="1618" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1618

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<pre style="margin: 0;"> <span id="LC1618" class="line" lang="haskell"><span class="n" style="color: #333;">tcDefaultAssocDecl</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">[</span><span class="n" style="color: #333;">dL</span><span class="o" style="font-weight: 600;">-></span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FamEqn</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XLHsQTyVars</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)]</span></span>

</pre>

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1588

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<td class="diff-line-num new_line" data-linenumber="1619" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1619

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<pre style="margin: 0;"> <span id="LC1619" class="line" lang="haskell">  <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"tcDefaultAssocDecl"</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1610" style="width: 35px; color: rgba(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="1641" style="width: 35px; color: rgba(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">@@ -1610,10 +1641,15 @@ We do this by creating a substitution [j |-> k, x |-> a, b |-> y] and</td>

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1610

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<td class="diff-line-num new_line" data-linenumber="1641" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1641

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<pre style="margin: 0;"> <span id="LC1641" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">applying this substitution to the RHS.</span></span>

</pre>

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1611

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1642

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<pre style="margin: 0;"> <span id="LC1642" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1612" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1612

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<td class="diff-line-num new_line" data-linenumber="1643" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1643

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<pre style="margin: 0;"> <span id="LC1643" 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>

</pre>

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1613

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<td class="diff-line-num new_line old" data-linenumber="1644" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC1613" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the arguments in the default instance consist of type variables. The parser</span></span>

</pre>

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1614

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<td class="diff-line-num new_line old" data-linenumber="1644" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC1614" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">already checks this to a certain degree (see RdrHsSyn.checkTyVars), but</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1615" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

1615

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<td class="diff-line-num new_line old" data-linenumber="1644" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC1615" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we must be wary of kind arguments being instantiated, which the parser cannot</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1616" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

1616

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<td class="diff-line-num new_line old" data-linenumber="1644" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC1616" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">catch so easily. Consider this erroneous program (inspired by #11361):</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="1644" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1644

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<pre style="margin: 0;">+<span id="LC1644" 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>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1617" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1645" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1645

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<pre style="margin: 0;">+<span id="LC1645" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This property has already been checked to some degree earlier in the compiler:</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="1646" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1646

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<pre style="margin: 0;">+<span id="LC1646" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">RdrHsSyn.checkTyVars ensures that all visible type arguments are type</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1617" style="width: 35px; color: rgba(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="1647" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1647

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<pre style="margin: 0;">+<span id="LC1647" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">variables, and RnTypes.bindLHsTyVarBndrs ensures that no visible type arguments</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1617" style="width: 35px; color: rgba(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="1648" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1648

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<pre style="margin: 0;">+<span id="LC1648" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">are duplicated. But these only check /visible/ arguments, however, so we still</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1617" style="width: 35px; color: rgba(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="1649" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1649

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<pre style="margin: 0;">+<span id="LC1649" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">must check the invisible kind arguments to see if these invariants are upheld.</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="1650" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1650

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<pre style="margin: 0;">+<span id="LC1650" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1617" style="width: 35px; color: rgba(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="1651" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1651

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<pre style="margin: 0;">+<span id="LC1651" 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>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1617" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1652" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1652

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<pre style="margin: 0;">+<span id="LC1652" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">example, consider this erroneous program (inspired by #11361):</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1617" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1617

</td>

<td class="diff-line-num new_line" data-linenumber="1653" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1653

</td>

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

<pre style="margin: 0;"> <span id="LC1653" class="line" lang="haskell"></span>

</pre>

</td>

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<td class="diff-line-num old_line" data-linenumber="1618" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1618

</td>

<td class="diff-line-num new_line" data-linenumber="1654" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1654

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

<pre style="margin: 0;"> <span id="LC1654" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   class C a where</span></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1619" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1619

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<td class="diff-line-num new_line" data-linenumber="1655" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1655

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

<pre style="margin: 0;"> <span id="LC1655" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">      type F (a :: k) b :: Type</span></span>

</pre>

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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1622" style="width: 35px; color: rgba(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="1658" style="width: 35px; color: rgba(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">@@ -1622,6 +1658,19 @@ catch so easily. Consider this erroneous program (inspired by #11361):</td>

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<td class="diff-line-num old_line" data-linenumber="1622" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1622

</td>

<td class="diff-line-num new_line" data-linenumber="1658" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1658

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<pre style="margin: 0;"> <span id="LC1658" 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>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1623" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1623

</td>

<td class="diff-line-num new_line" data-linenumber="1659" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1659

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

<pre style="margin: 0;"> <span id="LC1659" 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>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1624" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1624

</td>

<td class="diff-line-num new_line" data-linenumber="1660" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">

1660

</td>

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

<pre style="margin: 0;"> <span id="LC1660" class="line" lang="haskell"></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1625" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1661" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1661

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<pre style="margin: 0;">+<span id="LC1661" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Next, we must check that all arguments are distinct. Here is another offending</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1625" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1662" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1662

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<pre style="margin: 0;">+<span id="LC1662" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">example, this time taken from #13971:</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1625" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1663" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1663

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

<pre style="margin: 0;">+<span id="LC1663" class="line" lang="haskell"></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1625" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1664" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1664

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<pre style="margin: 0;">+<span id="LC1664" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   class C2 (a :: j) where</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1625" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1665" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1665

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<pre style="margin: 0;">+<span id="LC1665" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">      type F2 (a :: j) (b :: k)</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1625" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1666" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1666

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<pre style="margin: 0;">+<span id="LC1666" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">      type F2 (x :: z) (y :: z) = z</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1625" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1667" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1667

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<pre style="margin: 0;">+<span id="LC1667" class="line" lang="haskell"></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1625" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1668" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1668

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<pre style="margin: 0;">+<span id="LC1668" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">All of the arguments in the default equation for `F2` are type variables, so</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1625" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1669" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1669

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<pre style="margin: 0;">+<span id="LC1669" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that passes the first check. However, if we were to build this substitution,</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1625" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1670" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1670

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<pre style="margin: 0;">+<span id="LC1670" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">then both `j` and `k` map to `z`! In terms of visible kind application, it's as</span></span>

</pre>

</td>

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<td class="diff-line-num new old_line" data-linenumber="1625" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

</td>

<td class="diff-line-num new new_line" data-linenumber="1671" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1671

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<pre style="margin: 0;">+<span id="LC1671" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">if we had written `type F2 @z @z x y = z`, which makes it clear that we have</span></span>

</pre>

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1672

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<pre style="margin: 0;">+<span id="LC1672" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">duplicated a use of `z`. Therefore, `F2`'s default is also rejected.</span></span>

</pre>

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1673

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<pre style="margin: 0;">+<span id="LC1673" class="line" lang="haskell"></span>

</pre>

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1625

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<pre style="margin: 0;"> <span id="LC1674" 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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1626

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1675

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<pre style="margin: 0;"> <span id="LC1675" 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>

</pre>

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1627

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1676

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<pre style="margin: 0;"> <span id="LC1676" 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>

</pre>

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<br>

</li>

<li id="0942e35743c77f939f29199ed453d13b576a52e9">

<a href="https://gitlab.haskell.org/ghc/ghc/commit/78a5c4ce6bae233b655097ada3901028104f0f27#0942e35743c77f939f29199ed453d13b576a52e9"><strong>testsuite/tests/indexed-types/should_compile/T11361a.stderr</strong></a>

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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 = x’</span>

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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext">        The arguments to ‘F’ must all be type variables</span>

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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext">        The arguments to ‘F’ must all be <span class="idiff left right">distinct </span>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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<li id="69edc75f6597d0874498e964811e0c9ea4b7b1ef">

<a href="https://gitlab.haskell.org/ghc/ghc/commit/78a5c4ce6bae233b655097ada3901028104f0f27#69edc75f6597d0874498e964811e0c9ea4b7b1ef"><strong>testsuite/tests/indexed-types/should_fail/T13971.stderr</strong></a>

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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">T13971.hs:7:3: error:</span>

</pre>

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3

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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 = Int’</span>

</pre>

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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext">        The arguments to ‘T’ must all be type variables</span>

</pre>

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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext">        The arguments to ‘T’ must all be <span class="idiff left right">distinct </span>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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7

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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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<br>

</li>

<li id="a94def664ac811d2b4ab866516c8e7dc97cbfa9e">

<a href="https://gitlab.haskell.org/ghc/ghc/commit/78a5c4ce6bae233b655097ada3901028104f0f27#a94def664ac811d2b4ab866516c8e7dc97cbfa9e"><strong>testsuite/tests/indexed-types/should_fail/T13971b.hs</strong></a>

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

</pre>

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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE TypeFamilies #-}</span></span>

</pre>

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3

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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T13971b</span> <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

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

</pre>

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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Kind</span></span>

</pre>

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6

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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">j</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

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8

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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell">  <span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">j</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">k</span><span class="p">)</span></span>

</pre>

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9

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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;">T</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">k</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">k</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">k</span></span></pre>

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<br>

</li>

<li id="ad0b4d579659de4effeafb89612694d8b6b98bf6">

<a href="https://gitlab.haskell.org/ghc/ghc/commit/78a5c4ce6bae233b655097ada3901028104f0f27#ad0b4d579659de4effeafb89612694d8b6b98bf6"><strong>testsuite/tests/indexed-types/should_fail/T13971b.stderr</strong></a>

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1

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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext"></span>

</pre>

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2

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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T13971b.hs:9:3: error:</span>

</pre>

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3

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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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4

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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext">        ‘type T @k @k a b = k’</span>

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5

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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>

</pre>

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7

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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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</li>

<li id="3e0457789f3266c805563b6a84cef1dfb08aed7e">

<a href="https://gitlab.haskell.org/ghc/ghc/commit/78a5c4ce6bae233b655097ada3901028104f0f27#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">@@ -137,6 +137,7 @@ test('T13674', normal, compile_fail, [''])</td>

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<pre style="margin: 0;"> <span id="LC137" class="line" lang="perl"><span class="s" style="color: #d14;">test('</span><span class="nv" style="color: #008080;">T13784</span><span class="s" style="color: #d14;">', normal, compile_fail, [''])</span></span>

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<pre style="margin: 0;"> <span id="LC138" class="line" lang="perl"><span class="s" style="color: #d14;">test('</span><span class="nv" style="color: #008080;">T13877</span><span class="s" style="color: #d14;">', normal, compile_fail, [''])</span></span>

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

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<pre style="margin: 0;"> <span id="LC139" class="line" lang="perl"><span class="s" style="color: #d14;">test('</span><span class="nv" style="color: #008080;">T13971</span><span class="s" style="color: #d14;">', normal, compile_fail, [''])</span></span>

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<pre style="margin: 0;">+<span id="LC140" class="line" lang="perl"><span class="s" style="color: #d14;">test('</span><span class="nv" style="color: #008080;">T13971b</span><span class="s" style="color: #d14;">', normal, compile_fail, [''])</span></span>

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<pre style="margin: 0;"> <span id="LC141" class="line" lang="perl"><span class="s" style="color: #d14;">test('</span><span class="nv" style="color: #008080;">T13972</span><span class="s" style="color: #d14;">', normal, compile, [''])</span></span>

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<td class="diff-line-num new_line" data-linenumber="142" style="width: 35px; color: rgba(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="LC142" class="line" lang="perl"><span class="s" style="color: #d14;">test('</span><span class="nv" style="color: #008080;">T14033</span><span class="s" style="color: #d14;">', normal, compile_fail, [''])</span></span>

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<pre style="margin: 0;"> <span id="LC143" class="line" lang="perl"><span class="s" style="color: #d14;">test('</span><span class="nv" style="color: #008080;">T14045a</span><span class="s" style="color: #d14;">', normal, compile, [''])</span></span>

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