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<h3>
Ryan Scott pushed to branch wip/T18470
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/f69ad265cce76b85d31e81eb62dede6eb02bd96f">f69ad265</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-07-26T13:15:52-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't mark closed type family equations as occurrences
Previously, `rnFamInstEqn` would mark the name of the type/data
family used in an equation as an occurrence, regardless of what sort
of family it is. Most of the time, this is the correct thing to do.
The exception is closed type families, whose equations constitute its
definition and therefore should not be marked as occurrences.
Overzealously counting the equations of a closed type family as
occurrences can cause certain warnings to not be emitted, as observed
in #18470. See `Note [Type family equations and occurrences]` in
`GHC.Rename.Module` for the full story.
This fixes #18470 with a little bit of extra-casing in
`rnFamInstEqn`. To accomplish this, I added an extra
`ClosedTyFamInfo` field to the `NonAssocTyFamEqn` constructor of
`AssocTyFamInfo` and refactored the relevant call sites accordingly
so that this information is propagated to `rnFamInstEqn`.
</pre>
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<h4>4 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#7dd1cd0f6f2164a14c83d9aa564dd32bc30e447a">
compiler/GHC/Rename/Module.hs
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<a href="#93febbc079ea3983ae2cd6b4e38bd0100fe8cb6a">
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+
testsuite/tests/typecheck/should_compile/T18470.hs
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<a href="#623344f69e3f04970d640d4a311861403c18b94c">
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+
testsuite/tests/typecheck/should_compile/T18470.stderr
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<li class="file-stats">
<a href="#34fe7bf0e6fbf60effb28393399ba68666593909">
testsuite/tests/typecheck/should_compile/all.T
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<h4>Changes:</h4>
<li id="7dd1cd0f6f2164a14c83d9aa564dd32bc30e447a">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f69ad265cce76b85d31e81eb62dede6eb02bd96f#7dd1cd0f6f2164a14c83d9aa564dd32bc30e447a"><strong>compiler/GHC/Rename/Module.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -424,11 +424,11 @@ patchCCallTarget unit callTarget =</td>
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424
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<pre style="margin: 0;"> <span id="LC424" class="line" lang="haskell"></span>
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425
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425
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<pre style="margin: 0;"> <span id="LC425" class="line" lang="haskell"><span class="n" style="color: #333;">rnSrcInstDecl</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">InstDecl</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RnM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">InstDecl</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">FreeVars</span><span class="p">)</span></span>
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426
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<pre style="margin: 0;"> <span id="LC426" class="line" lang="haskell"><span class="n" style="color: #333;">rnSrcInstDecl</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyFamInstD</span> <span class="p">{</span> <span class="n" style="color: #333;">tfid_inst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tfi</span> <span class="p">})</span></span>
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427
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<pre style="margin: 0;">-<span id="LC427" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">tfi'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnTyFamInstDecl</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">NonAssocTyFamEqn</span></span> <span class="n" style="color: #333;">tfi</span></span>
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<pre style="margin: 0;">+<span id="LC427" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">tfi'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnTyFamInstDecl</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NonAssocTyFamEqn</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NotClosedTyFam</span></span><span class="p"><span class="idiff right">)</span></span> <span class="n" style="color: #333;">tfi</span></span>
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428
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<pre style="margin: 0;"> <span id="LC428" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyFamInstD</span> <span class="p">{</span> <span class="n" style="color: #333;">tfid_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">noExtField</span><span class="p">,</span> <span class="n" style="color: #333;">tfid_inst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tfi'</span> <span class="p">},</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC429" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC430" class="line" lang="haskell"><span class="n" style="color: #333;">rnSrcInstDecl</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DataFamInstD</span> <span class="p">{</span> <span class="n" style="color: #333;">dfid_inst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dfi</span> <span class="p">})</span></span>
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<pre style="margin: 0;">-<span id="LC431" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">dfi'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnDataFamInstDecl</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left right">NonAssocTyFamEqn</span></span> <span class="n" style="color: #333;">dfi</span></span>
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<pre style="margin: 0;">+<span id="LC431" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">dfi'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnDataFamInstDecl</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NonAssocTyFamEqn</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NotClosedTyFam</span></span><span class="p"><span class="idiff right">)</span></span> <span class="n" style="color: #333;">dfi</span></span>
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<pre style="margin: 0;"> <span id="LC432" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">DataFamInstD</span> <span class="p">{</span> <span class="n" style="color: #333;">dfid_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">noExtField</span><span class="p">,</span> <span class="n" style="color: #333;">dfid_inst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">dfi'</span> <span class="p">},</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC433" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC434" class="line" lang="haskell"><span class="n" style="color: #333;">rnSrcInstDecl</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ClsInstD</span> <span class="p">{</span> <span class="n" style="color: #333;">cid_inst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cid</span> <span class="p">})</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -760,8 +760,12 @@ rnFamInstEqn doc atfi rhs_kvars</td>
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<pre style="margin: 0;"> <span id="LC760" class="line" lang="haskell"> <span class="n" style="color: #333;">all_nms</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">all_imp_var_names</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">hsLTyVarNames</span> <span class="n" style="color: #333;">bndrs'</span></span>
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<pre style="margin: 0;"> <span id="LC761" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">warnUnusedTypePatterns</span> <span class="n" style="color: #333;">all_nms</span> <span class="n" style="color: #333;">nms_used</span></span>
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762
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<pre style="margin: 0;"> <span id="LC762" class="line" lang="haskell"></span>
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763
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<pre style="margin: 0;">-<span id="LC763" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">all_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">rhs_fvs</span> <span class="p">`</span><span class="n" style="color: #333;">plusFV</span><span class="p">`</span> <span class="n" style="color: #333;">pat_fvs</span><span class="p">)</span> <span class="p">`</span><span class="n" style="color: #333;">addOneFV</span><span class="p">`</span> <span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">tycon'</span></span>
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764
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<pre style="margin: 0;">-<span id="LC764" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- type instance => use, hence addOneFV</span></span>
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<pre style="margin: 0;">+<span id="LC763" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">eqn_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs_fvs</span> <span class="p">`</span><span class="n" style="color: #333;">plusFV</span><span class="p">`</span> <span class="n" style="color: #333;">pat_fvs</span></span>
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<pre style="margin: 0;">+<span id="LC764" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Type family equations and occurrences]</span></span>
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<pre style="margin: 0;">+<span id="LC765" class="line" lang="haskell"> <span class="n" style="color: #333;">all_fvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">atfi</span> <span class="kr" style="font-weight: 600;">of</span></span>
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766
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<pre style="margin: 0;">+<span id="LC766" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NonAssocTyFamEqn</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ClosedTyFam</span><span class="p">{})</span></span>
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<pre style="margin: 0;">+<span id="LC767" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">eqn_fvs</span></span>
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<pre style="margin: 0;">+<span id="LC768" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">eqn_fvs</span> <span class="p">`</span><span class="n" style="color: #333;">addOneFV</span><span class="p">`</span> <span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">tycon'</span></span>
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765
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769
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<pre style="margin: 0;"> <span id="LC769" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC770" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsIB</span> <span class="p">{</span> <span class="n" style="color: #333;">hsib_ext</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">all_imp_var_names</span> <span class="c1" style="color: #998; font-style: italic;">-- Note [Wildcards in family instances]</span></span>
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<pre style="margin: 0;"> <span id="LC771" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">hsib_body</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -776,14 +780,14 @@ rnFamInstEqn doc atfi rhs_kvars</td>
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<pre style="margin: 0;"> <span id="LC780" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The parent class, if we are dealing with an associated type family</span></span>
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<pre style="margin: 0;"> <span id="LC781" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- instance.</span></span>
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<pre style="margin: 0;"> <span id="LC782" class="line" lang="haskell"> <span class="n" style="color: #333;">mb_cls</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">atfi</span> <span class="kr" style="font-weight: 600;">of</span></span>
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779
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<pre style="margin: 0;">-<span id="LC779" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NonAssocTyFamEqn</span> <span class="idiff left right"> </span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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783
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<pre style="margin: 0;">+<span id="LC783" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NonAssocTyFamEqn</span> <span class="kr" style="font-weight: 600;"><span class="idiff left right">_</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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780
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784
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<pre style="margin: 0;"> <span id="LC784" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">AssocTyFamDeflt</span> <span class="n" style="color: #333;">cls</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">cls</span></span>
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781
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785
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<pre style="margin: 0;"> <span id="LC785" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">AssocTyFamInst</span> <span class="n" style="color: #333;">cls</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">cls</span></span>
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782
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786
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<pre style="margin: 0;"> <span id="LC786" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC787" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The type variables from the instance head, if we are dealing with an</span></span>
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<pre style="margin: 0;"> <span id="LC788" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- associated type family instance.</span></span>
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<pre style="margin: 0;"> <span id="LC789" class="line" lang="haskell"> <span class="n" style="color: #333;">inst_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">atfi</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC786" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NonAssocTyFamEqn</span> <span class="idiff left right"> </span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;">+<span id="LC790" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NonAssocTyFamEqn</span> <span class="kr" style="font-weight: 600;"><span class="idiff left right">_</span></span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;"> <span id="LC791" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">AssocTyFamDeflt</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">[]</span></span>
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<pre style="margin: 0;"> <span id="LC792" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">AssocTyFamInst</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">inst_tvs</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">inst_tvs</span></span>
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<pre style="margin: 0;"> <span id="LC793" class="line" lang="haskell"></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -806,22 +810,46 @@ rnTyFamInstDecl :: AssocTyFamInfo</td>
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<pre style="margin: 0;"> <span id="LC810" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyFamInstDecl</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
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<pre style="margin: 0;"> <span id="LC811" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RnM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyFamInstDecl</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">FreeVars</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC812" class="line" lang="haskell"><span class="n" style="color: #333;">rnTyFamInstDecl</span> <span class="n" style="color: #333;">atfi</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyFamInstDecl</span> <span class="p">{</span> <span class="n" style="color: #333;">tfid_eqn</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eqn</span> <span class="p">})</span></span>
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<pre style="margin: 0;">-<span id="LC809" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">eqn'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnTyFamInstEqn</span> <span class="n" style="color: #333;">atfi</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">NotClosedTyFam</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">eqn</span></span>
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<pre style="margin: 0;">+<span id="LC813" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">eqn'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnTyFamInstEqn</span> <span class="n" style="color: #333;">atfi</span> <span class="n" style="color: #333;">eqn</span></span>
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<pre style="margin: 0;"> <span id="LC814" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyFamInstDecl</span> <span class="p">{</span> <span class="n" style="color: #333;">tfid_eqn</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">eqn'</span> <span class="p">},</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC815" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC816" class="line" lang="haskell"><span class="cd">-- | Tracks whether we are renaming:</span></span>
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<pre style="margin: 0;"> <span id="LC817" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;"> <span id="LC818" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 1. A type family equation that is not associated</span></span>
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<pre style="margin: 0;">-<span id="LC815" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- with a parent type class ('NonAssocTyFamEqn')</span></span>
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<pre style="margin: 0;">+<span id="LC819" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- with a parent type class ('NonAssocTyFamEqn')<span class="idiff left right">. Examples:</span></span></span>
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<pre style="margin: 0;"> <span id="LC820" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">-<span id="LC817" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 2. An associated type family default declaration ('AssocTyFamDeflt')</span></span>
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821
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<pre style="margin: 0;">+<span id="LC821" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @</span></span>
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822
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<pre style="margin: 0;">+<span id="LC822" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- type family F a</span></span>
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823
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<pre style="margin: 0;">+<span id="LC823" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- type instance F Int = Bool -- NonAssocTyFamEqn NotClosed</span></span>
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818
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824
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<pre style="margin: 0;"> <span id="LC824" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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819
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<pre style="margin: 0;">-<span id="LC819" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 3. An associated type family instance declaration ('AssocTyFamInst')</span></span>
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825
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<pre style="margin: 0;">+<span id="LC825" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- type family G a where</span></span>
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826
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<pre style="margin: 0;">+<span id="LC826" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- G Int = Bool -- NonAssocTyFamEqn Closed</span></span>
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827
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<pre style="margin: 0;">+<span id="LC827" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @</span></span>
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828
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<pre style="margin: 0;">+<span id="LC828" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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829
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<pre style="margin: 0;">+<span id="LC829" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 2. An associated type family default declaration ('AssocTyFamDeflt').</span></span>
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830
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<pre style="margin: 0;">+<span id="LC830" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Example:</span></span>
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831
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<pre style="margin: 0;">+<span id="LC831" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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832
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<pre style="margin: 0;">+<span id="LC832" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @</span></span>
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833
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<pre style="margin: 0;">+<span id="LC833" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- class C a where</span></span>
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834
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<pre style="margin: 0;">+<span id="LC834" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- type A a</span></span>
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835
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<pre style="margin: 0;">+<span id="LC835" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- type instance A a = a -> a -- AssocTyFamDeflt C</span></span>
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836
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<pre style="margin: 0;">+<span id="LC836" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @</span></span>
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837
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<pre style="margin: 0;">+<span id="LC837" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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838
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<pre style="margin: 0;">+<span id="LC838" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 3. An associated type family instance declaration ('AssocTyFamInst').</span></span>
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839
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<pre style="margin: 0;">+<span id="LC839" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Example:</span></span>
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840
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<pre style="margin: 0;">+<span id="LC840" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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841
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<pre style="margin: 0;">+<span id="LC841" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @</span></span>
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842
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<pre style="margin: 0;">+<span id="LC842" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- instance C a => C [a] where</span></span>
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<pre style="margin: 0;">+<span id="LC843" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- type A [a] = Bool -- AssocTyFamInst C [a]</span></span>
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<pre style="margin: 0;">+<span id="LC844" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @</span></span>
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<pre style="margin: 0;"> <span id="LC845" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">AssocTyFamInfo</span></span>
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<pre style="margin: 0;"> <span id="LC846" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">NonAssocTyFamEqn</span></span>
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<pre style="margin: 0;">-<span id="LC822" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">AssocTyFamDeflt</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="c1" style="color: #998; font-style: italic;">-- Name of the parent class</span></span>
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<pre style="margin: 0;">-<span id="LC823" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">AssocTyFamInst</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="c1" style="color: #998; font-style: italic;">-- Name of the parent class</span></span>
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<pre style="margin: 0;">-<span id="LC824" class="line" lang="haskell"> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- Names of the tyvars of the parent instance decl</span></span>
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<pre style="margin: 0;">+<span id="LC847" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ClosedTyFamInfo</span> <span class="c1" style="color: #998; font-style: italic;">-- Is this a closed type family?</span></span>
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<pre style="margin: 0;">+<span id="LC848" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">AssocTyFamDeflt</span></span>
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<pre style="margin: 0;">+<span id="LC849" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="c1" style="color: #998; font-style: italic;">-- Name of the parent class</span></span>
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<pre style="margin: 0;">+<span id="LC850" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">AssocTyFamInst</span></span>
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<pre style="margin: 0;">+<span id="LC851" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Name</span> <span class="c1" style="color: #998; font-style: italic;">-- Name of the parent class</span></span>
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<pre style="margin: 0;">+<span id="LC852" class="line" lang="haskell"> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- Names of the tyvars of the parent instance decl</span></span>
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<pre style="margin: 0;"> <span id="LC853" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC854" class="line" lang="haskell"><span class="cd">-- | Tracks whether we are renaming an equation in a closed type family</span></span>
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<pre style="margin: 0;"> <span id="LC855" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- equation ('ClosedTyFam') or not ('NotClosedTyFam').</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -831,22 +859,25 @@ data ClosedTyFamInfo</td>
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<pre style="margin: 0;"> <span id="LC859" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The names (RdrName and Name) of the closed type family</span></span>
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<pre style="margin: 0;"> <span id="LC860" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC861" class="line" lang="haskell"><span class="n" style="color: #333;">rnTyFamInstEqn</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">AssocTyFamInfo</span></span>
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<pre style="margin: 0;">-<span id="LC834" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ClosedTyFamInfo</span></span>
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862
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<pre style="margin: 0;"> <span id="LC862" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyFamInstEqn</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span></span>
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<pre style="margin: 0;"> <span id="LC863" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RnM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyFamInstEqn</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">FreeVars</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC837" class="line" lang="haskell"><span class="n" style="color: #333;">rnTyFamInstEqn</span> <span class="n" style="color: #333;">atfi</span><span class="idiff left"> </span><span class="n" style="color: #333;"><span class="idiff right">ctf_info</span></span></span>
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<pre style="margin: 0;">+<span id="LC864" class="line" lang="haskell"><span class="n" style="color: #333;">rnTyFamInstEqn</span> <span class="n" style="color: #333;">atfi</span></span>
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<pre style="margin: 0;"> <span id="LC865" class="line" lang="haskell"> <span class="n" style="color: #333;">eqn</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsIB</span> <span class="p">{</span> <span class="n" style="color: #333;">hsib_body</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">FamEqn</span> <span class="p">{</span> <span class="n" style="color: #333;">feqn_tycon</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tycon</span></span>
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<pre style="margin: 0;"> <span id="LC866" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">feqn_rhs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rhs</span> <span class="p">}})</span></span>
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867
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<pre style="margin: 0;"> <span id="LC867" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">rhs_kvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extractHsTyRdrTyVarsKindVars</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;"> <span id="LC868" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">eqn'</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsIB</span> <span class="p">{</span> <span class="n" style="color: #333;">hsib_body</span> <span class="o" style="font-weight: 600;">=</span></span>
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869
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<pre style="margin: 0;"> <span id="LC869" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">FamEqn</span> <span class="p">{</span> <span class="n" style="color: #333;">feqn_tycon</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">tycon'</span> <span class="p">}}),</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC870" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnFamInstEqn</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TySynCtx</span> <span class="n" style="color: #333;">tycon</span><span class="p">)</span> <span class="n" style="color: #333;">atfi</span> <span class="n" style="color: #333;">rhs_kvs</span> <span class="n" style="color: #333;">eqn</span> <span class="n" style="color: #333;">rnTySyn</span></span>
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<pre style="margin: 0;">-<span id="LC844" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">ctf_info</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC845" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NotClosedTyFam</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">-<span id="LC846" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">ClosedTyFam</span> <span class="n" style="color: #333;">fam_rdr_name</span> <span class="n" style="color: #333;">fam_name</span> <span class="o" style="font-weight: 600;">-></span></span>
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<pre style="margin: 0;">+<span id="LC871" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC872" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- For closed type families, check that each equation is for the</span></span>
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<pre style="margin: 0;">+<span id="LC873" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- right type family. E.g. barf on</span></span>
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<pre style="margin: 0;">+<span id="LC874" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- type family F a where { G Int = Bool }</span></span>
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<pre style="margin: 0;">+<span id="LC875" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">atfi</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC876" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NonAssocTyFamEqn</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ClosedTyFam</span> <span class="n" style="color: #333;">fam_rdr_name</span> <span class="n" style="color: #333;">fam_name</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span></span>
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877
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<pre style="margin: 0;"> <span id="LC877" class="line" lang="haskell"> <span class="n" style="color: #333;">checkTc</span> <span class="p">(</span><span class="n" style="color: #333;">fam_name</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">tycon'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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878
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<pre style="margin: 0;"> <span id="LC878" class="line" lang="haskell"> <span class="n" style="color: #333;">withHsDocContext</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyFamilyCtx</span> <span class="n" style="color: #333;">fam_rdr_name</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC879" class="line" lang="haskell"> <span class="n" style="color: #333;">wrongTyFamName</span> <span class="n" style="color: #333;">fam_name</span> <span class="n" style="color: #333;">tycon'</span></span>
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<pre style="margin: 0;">+<span id="LC880" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pure</span> <span class="nb" style="color: #0086b3;">()</span></span>
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850
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881
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<pre style="margin: 0;"> <span id="LC881" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">pure</span> <span class="p">(</span><span class="n" style="color: #333;">eqn'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="p">}</span></span>
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851
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882
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<pre style="margin: 0;"> <span id="LC882" class="line" lang="haskell"></span>
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852
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883
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<pre style="margin: 0;"> <span id="LC883" class="line" lang="haskell"><span class="n" style="color: #333;">rnTyFamDefltDecl</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Name</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -995,6 +1026,51 @@ was previously bound by the `instance C (Maybe a)` part. (see #16116).</td>
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995
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1026
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<pre style="margin: 0;"> <span id="LC1026" class="line" lang="haskell"></span>
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996
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1027
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<pre style="margin: 0;"> <span id="LC1027" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In each case, the function which detects improperly bound variables on the RHS</span></span>
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997
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1028
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<pre style="margin: 0;"> <span id="LC1028" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is GHC.Tc.Validity.checkValidFamPats.</span></span>
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1029
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<pre style="margin: 0;">+<span id="LC1029" class="line" lang="haskell"></span>
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1030
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<pre style="margin: 0;">+<span id="LC1030" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Type family equations and occurrences]</span></span>
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1031
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<pre style="margin: 0;">+<span id="LC1031" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1032
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<pre style="margin: 0;">+<span id="LC1032" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In most data/type family equations, the type family name used in the equation</span></span>
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1033
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<pre style="margin: 0;">+<span id="LC1033" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is treated as an occurrence. For example:</span></span>
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1034
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<pre style="margin: 0;">+<span id="LC1034" class="line" lang="haskell"></span>
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1035
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<pre style="margin: 0;">+<span id="LC1035" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> module A where</span></span>
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1036
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<pre style="margin: 0;">+<span id="LC1036" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type family F a</span></span>
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1037
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<pre style="margin: 0;">+<span id="LC1037" class="line" lang="haskell"></span>
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1038
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<pre style="margin: 0;">+<span id="LC1038" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> module B () where</span></span>
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1039
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<pre style="margin: 0;">+<span id="LC1039" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> import B (F)</span></span>
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1040
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<pre style="margin: 0;">+<span id="LC1040" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type instance F Int = Bool</span></span>
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1041
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<pre style="margin: 0;">+<span id="LC1041" class="line" lang="haskell"></span>
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1042
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<pre style="margin: 0;">+<span id="LC1042" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We do not want to warn about `F` being unused in the module `B`, as the</span></span>
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1043
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<pre style="margin: 0;">+<span id="LC1043" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">instance constitutes a use site for `F`. The exception to this rule is closed</span></span>
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1044
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<pre style="margin: 0;">+<span id="LC1044" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">type families, whose equations constitute a definition, not occurrences. For</span></span>
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1045
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<pre style="margin: 0;">+<span id="LC1045" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">example:</span></span>
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1046
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<pre style="margin: 0;">+<span id="LC1046" class="line" lang="haskell"></span>
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1047
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<pre style="margin: 0;">+<span id="LC1047" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> module C () where</span></span>
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1048
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<pre style="margin: 0;">+<span id="LC1048" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type family CF a where</span></span>
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1049
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<pre style="margin: 0;">+<span id="LC1049" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> CF Char = Float</span></span>
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1050
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<pre style="margin: 0;">+<span id="LC1050" class="line" lang="haskell"></span>
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1051
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<pre style="margin: 0;">+<span id="LC1051" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here, we /do/ want to warn that `CF` is unused in the module `C`, as it is</span></span>
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1052
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<pre style="margin: 0;">+<span id="LC1052" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">defined but not used (#18470).</span></span>
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1053
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<pre style="margin: 0;">+<span id="LC1053" class="line" lang="haskell"></span>
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1054
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<pre style="margin: 0;">+<span id="LC1054" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC accomplishes this in rnFamInstEqn when determining the set of free</span></span>
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1055
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<pre style="margin: 0;">+<span id="LC1055" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">variables to return at the end. If renaming a data family or open type family</span></span>
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1056
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<pre style="margin: 0;">+<span id="LC1056" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">equation, we add the name of the type family constructor to the set of returned</span></span>
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1057
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<pre style="margin: 0;">+<span id="LC1057" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">free variables to ensure that the name is marked as an occurrence. If renaming</span></span>
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1058
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<pre style="margin: 0;">+<span id="LC1058" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">a closed type family equation, we avoid adding the type family constructor name</span></span>
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1059
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<pre style="margin: 0;">+<span id="LC1059" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to the free variables. This is quite simple, but it is not a perfect solution.</span></span>
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1060
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<pre style="margin: 0;">+<span id="LC1060" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider this example:</span></span>
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1061
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<pre style="margin: 0;">+<span id="LC1061" class="line" lang="haskell"></span>
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1062
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<pre style="margin: 0;">+<span id="LC1062" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> module X () where</span></span>
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1063
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<pre style="margin: 0;">+<span id="LC1063" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type family F a where</span></span>
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1064
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<pre style="margin: 0;">+<span id="LC1064" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> F Int = Bool</span></span>
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1065
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<pre style="margin: 0;">+<span id="LC1065" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> F Double = F Int</span></span>
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1066
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<pre style="margin: 0;">+<span id="LC1066" class="line" lang="haskell"></span>
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1067
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<pre style="margin: 0;">+<span id="LC1067" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">At present, GHC will treat any use of a type family constructor on the RHS of a</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1068" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1068
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<pre style="margin: 0;">+<span id="LC1068" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">type family equation as an occurrence. Since `F` is used on the RHS of the</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1069" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1069
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<pre style="margin: 0;">+<span id="LC1069" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">second equation of `F`, it is treated as an occurrence, causing `F` not to be</span></span>
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1070
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<pre style="margin: 0;">+<span id="LC1070" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">warned about. This is not ideal, since `F` isn't exported—it really /should/</span></span>
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<pre style="margin: 0;">+<span id="LC1071" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">cause a warning to be emitted. There is some discussion in #10089/#12920 about</span></span>
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1072
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<pre style="margin: 0;">+<span id="LC1072" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">how this limitation might be overcome, but until then, we stick to the</span></span>
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<pre style="margin: 0;">+<span id="LC1073" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">simplistic solution above, as it fixes the egregious bug in #18470.</span></span>
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1074
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<pre style="margin: 0;"> <span id="LC1074" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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1075
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<pre style="margin: 0;"> <span id="LC1075" class="line" lang="haskell"></span>
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1076
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<pre style="margin: 0;"> <span id="LC1076" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1963" style="width: 35px; color: rgba(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="2039" style="width: 35px; color: rgba(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">@@ -1963,7 +2039,7 @@ rnFamDecl mb_cls (FamilyDecl { fdLName = tycon, fdTyVars = tyvars</td>
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1963
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2039
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<pre style="margin: 0;"> <span id="LC2039" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">FamilyInfo</span> <span class="kt" style="color: #458; font-weight: 600;">GhcPs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RnM</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">FamilyInfo</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">FreeVars</span><span class="p">)</span></span>
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1964
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2040
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<pre style="margin: 0;"> <span id="LC2040" class="line" lang="haskell"> <span class="n" style="color: #333;">rn_info</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">fam_name</span><span class="p">)</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ClosedTypeFamily</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">eqns</span><span class="p">))</span></span>
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1965
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2041
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<pre style="margin: 0;"> <span id="LC2041" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">eqns'</span><span class="p">,</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span></span>
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1966
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<pre style="margin: 0;">-<span id="LC1966" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnList</span> <span class="p">(</span><span class="n" style="color: #333;">rnTyFamInstEqn</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">NonAssocTyFamEqn</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">ClosedTyFam</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tycon</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">fam_name</span></span><span class="p">))</span></span>
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2042
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<pre style="margin: 0;">+<span id="LC2042" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">rnList</span> <span class="p">(</span><span class="n" style="color: #333;">rnTyFamInstEqn</span> <span class="p"><span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">NonAssocTyFamEqn</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">ClosedTyFam</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">tycon</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">fam_name</span></span><span class="p"><span class="idiff right">)</span>))</span></span>
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1967
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2043
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<pre style="margin: 0;"> <span id="LC2043" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- no class context</span></span>
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1968
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2044
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<pre style="margin: 0;"> <span id="LC2044" class="line" lang="haskell"> <span class="n" style="color: #333;">eqns</span></span>
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1969
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2045
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<pre style="margin: 0;"> <span id="LC2045" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ClosedTypeFamily</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">eqns'</span><span class="p">),</span> <span class="n" style="color: #333;">fvs</span><span class="p">)</span> <span class="p">}</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f69ad265cce76b85d31e81eb62dede6eb02bd96f#93febbc079ea3983ae2cd6b4e38bd0100fe8cb6a"><strong>testsuite/tests/typecheck/should_compile/T18470.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE TypeFamilies #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# OPTIONS_GHC -Wunused-top-binds #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T18470</span> <span class="p">()</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">Closed</span> <span class="n" style="color: #333;">x</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Closed</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f69ad265cce76b85d31e81eb62dede6eb02bd96f#623344f69e3f04970d640d4a311861403c18b94c"><strong>testsuite/tests/typecheck/should_compile/T18470.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T18470.hs:6:1: warning: [-Wunused-top-binds (in -Wextra, -Wunused-binds)]</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> Defined but not used: type constructor or class ‘Closed’</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f69ad265cce76b85d31e81eb62dede6eb02bd96f#34fe7bf0e6fbf60effb28393399ba68666593909"><strong>testsuite/tests/typecheck/should_compile/all.T</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="717" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -717,3 +717,4 @@ test('T17775-viewpats-b', normal, compile_fail, [''])</td>
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717
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<pre style="margin: 0;"> <span id="LC717" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17775-viewpats-c</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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718
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<pre style="margin: 0;"> <span id="LC718" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17775-viewpats-d</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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719
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<pre style="margin: 0;"> <span id="LC719" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18412</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">+<span id="LC720" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18470</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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