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<h3>
Ryan Scott pushed to branch wip/T18021
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/96ad03e1e9a417ee9201f89968a760da0fb2d683">96ad03e1</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-12-07T06:21:10-05:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Reject dodgy scoping in associated family instance RHSes
Commit e63518f5d6a93be111f9108c0990a1162f88d615 tried to push all of the logic
of detecting out-of-scope type variables on the RHSes of associated type family
instances to `GHC.Tc.Validity` by deleting a similar check in the renamer.
Unfortunately, this commit went a little too far, as there are some corner
cases that `GHC.Tc.Validity` doesn't detect. Consider this example:
```hs
class C a where
data D a
instance forall a. C Int where
data instance D Int = MkD a
```
If this program isn't rejected by the time it reaches the typechecker, then
GHC will believe the `a` in `MkD a` is existentially quantified and accept it.
This is almost surely not what the user wants! The simplest way to reject
programs like this is to restore the old validity check in the renamer
(search for `improperly_scoped` in `rnFamEqn`).
Note that this is technically a breaking change, since the program in the
`polykinds/T9574` test case (which previously compiled) will now be rejected:
```hs
instance Funct ('KProxy :: KProxy o) where
type Codomain 'KProxy = NatTr (Proxy :: o -> *)
```
This is because the `o` on the RHS will now be rejected for being out of scope.
Luckily, this is simple to repair:
```hs
instance Funct ('KProxy :: KProxy o) where
type Codomain ('KProxy @o) = NatTr (Proxy :: o -> *)
```
All of the discussion is now a part of the revamped
`Note [Renaming associated types]` in `GHC.Rename.Module`.
A different design would be to make associated type family instances have
completely separate scoping from the parent instance declaration, much like
how associated type family default declarations work today. See the discussion
beginning at https://gitlab.haskell.org/ghc/ghc/-/issues/18021#note_265729 for
more on this point. This, however, would break even more programs that are
accepted today and likely warrants a GHC proposal before going forward. In the
meantime, this patch fixes the issue described in #18021 in the least invasive
way possible. There are programs that are accepted today that will no longer
be accepted after this patch, but they are arguably pathological programs, and
they are simple to repair.
Fixes #18021.
</pre>
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<h4>8 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#7dd1cd0f6f2164a14c83d9aa564dd32bc30e447a">
compiler/GHC/Rename/Module.hs
</a>
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<li class="file-stats">
<a href="#d87dfc77856eeaef6134e28336290ddcbcf18d7d">
docs/users_guide/9.2.1-notes.rst
</a>
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<li class="file-stats">
<a href="#905edd9556ba05c7a7d1f0669bfca9828807ed32">
testsuite/tests/indexed-types/should_fail/T5515.stderr
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<li class="file-stats">
<a href="#3c2d2e698cec41f8cd53fa12a38d89e5ec69edde">
<span class="new-file">
+
testsuite/tests/polykinds/T9574.stderr
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</a>
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<li class="file-stats">
<a href="#37bb83d0a916288b2296ba25cdbbef228eed6484">
testsuite/tests/polykinds/all.T
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<li class="file-stats">
<a href="#089da87ed5899aea05128c866a6ef5662ee6fcf7">
<span class="new-file">
+
testsuite/tests/rename/should_fail/T18021.hs
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<li class="file-stats">
<a href="#7b3cdc7054f66b8e815fa60bc2558cb503bf972d">
<span class="new-file">
+
testsuite/tests/rename/should_fail/T18021.stderr
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<li class="file-stats">
<a href="#c2554d4efde41e6e193f728122336449d2cb5fc5">
testsuite/tests/rename/should_fail/all.T
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</ul>
<h4>Changes:</h4>
<li id="7dd1cd0f6f2164a14c83d9aa564dd32bc30e447a">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/96ad03e1e9a417ee9201f89968a760da0fb2d683#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">@@ -725,10 +725,24 @@ rnFamEqn doc atfi rhs_kvars</td>
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725
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<pre style="margin: 0;"> <span id="LC725" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- of the instance decl. See</span></span>
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726
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<pre style="margin: 0;"> <span id="LC726" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Unused type variables in family instances]</span></span>
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<pre style="margin: 0;"> <span id="LC727" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">nms_used</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendNameSetList</span> <span class="n" style="color: #333;">rhs_fvs</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC728" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">inst_tvs</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">++</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">nms_dups</span></span></span>
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<pre style="margin: 0;">+<span id="LC728" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">nms_dups</span></span><span class="idiff"> </span><span class="cm" style="color: #998; font-style: italic;"><span class="idiff">{- (a) -}</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">++</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">inst_head_tvs</span></span><span class="idiff"> </span><span class="cm" style="color: #998; font-style: italic;"><span class="idiff right">{- (b) -}</span></span></span>
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<pre style="margin: 0;"> <span id="LC729" 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;">hsOuterTyVarNames</span> <span class="n" style="color: #333;">rn_outer_bndrs'</span></span>
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<pre style="margin: 0;"> <span id="LC730" 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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<pre style="margin: 0;"> <span id="LC731" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC732" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- For associated family instances, if a type variable from the</span></span>
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<pre style="margin: 0;">+<span id="LC733" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- parent instance declaration is mentioned on the RHS of the</span></span>
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<pre style="margin: 0;">+<span id="LC734" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- associated family instance but not bound on the LHS, then reject</span></span>
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<pre style="margin: 0;">+<span id="LC735" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- that type variable as being out of scope.</span></span>
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<pre style="margin: 0;">+<span id="LC736" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Renaming associated types]</span></span>
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<pre style="margin: 0;">+<span id="LC737" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">lhs_bound_vars</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendNameSetList</span> <span class="n" style="color: #333;">pat_fvs</span> <span class="n" style="color: #333;">all_nms</span></span>
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<pre style="margin: 0;">+<span id="LC738" class="line" lang="haskell"> <span class="n" style="color: #333;">improperly_scoped</span> <span class="n" style="color: #333;">cls_tkv</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC739" class="line" lang="haskell"> <span class="n" style="color: #333;">cls_tkv</span> <span class="p">`</span><span class="n" style="color: #333;">elemNameSet</span><span class="p">`</span> <span class="n" style="color: #333;">rhs_fvs</span></span>
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<pre style="margin: 0;">+<span id="LC740" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Mentioned on the RHS...</span></span>
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<pre style="margin: 0;">+<span id="LC741" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">&&</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">cls_tkv</span> <span class="p">`</span><span class="n" style="color: #333;">elemNameSet</span><span class="p">`</span> <span class="n" style="color: #333;">lhs_bound_vars</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC742" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ...but not bound on the LHS.</span></span>
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<pre style="margin: 0;">+<span id="LC743" class="line" lang="haskell"> <span class="n" style="color: #333;">bad_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filter</span> <span class="n" style="color: #333;">improperly_scoped</span> <span class="n" style="color: #333;">inst_head_tvs</span></span>
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<pre style="margin: 0;">+<span id="LC744" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">unless</span> <span class="p">(</span><span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">bad_tvs</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">badAssocRhs</span> <span class="n" style="color: #333;">bad_tvs</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC745" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC746" 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="LC747" 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="LC748" 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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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -754,10 +768,10 @@ rnFamEqn doc atfi rhs_kvars</td>
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<pre style="margin: 0;"> <span id="LC768" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC769" 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="LC770" 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="LC757" 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="LC758" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NonAssocTyFamEqn</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="LC759" 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="LC760" 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_<span class="idiff left">tvs</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">inst</span>_tvs</span></span>
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<pre style="margin: 0;">+<span id="LC771" class="line" lang="haskell"> <span class="n" style="color: #333;">inst_<span class="idiff left right">head_</span>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="LC772" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">NonAssocTyFamEqn</span> <span class="kr" style="font-weight: 600;">_</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="LC773" 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="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="LC774" 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_<span class="idiff left">head_tvs</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">inst_head</span>_tvs</span></span>
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<pre style="margin: 0;"> <span id="LC775" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC776" class="line" lang="haskell"> <span class="n" style="color: #333;">pat_kity_vars_with_dups</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extractHsTyArgRdrKiTyVars</span> <span class="n" style="color: #333;">pats</span></span>
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<pre style="margin: 0;"> <span id="LC777" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- It is crucial that extractHsTyArgRdrKiTyVars return</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">@@ -774,6 +788,13 @@ rnFamEqn doc atfi rhs_kvars</td>
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<pre style="margin: 0;"> <span id="LC788" class="line" lang="haskell"> <span class="p">[</span><span class="n" style="color: #333;">loc</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">loc</span></span>
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<pre style="margin: 0;"> <span id="LC789" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">loc</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">locs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">loc</span> <span class="p">`</span><span class="n" style="color: #333;">combineSrcSpans</span><span class="p">`</span> <span class="n" style="color: #333;">last</span> <span class="n" style="color: #333;">locs</span></span>
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<pre style="margin: 0;"> <span id="LC790" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC791" class="line" lang="haskell"> <span class="n" style="color: #333;">badAssocRhs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">RnM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC792" class="line" lang="haskell"> <span class="n" style="color: #333;">badAssocRhs</span> <span class="n" style="color: #333;">ns</span></span>
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<pre style="margin: 0;">+<span id="LC793" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addErr</span> <span class="p">(</span><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;">"The RHS of an associated type declaration mentions"</span></span>
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<pre style="margin: 0;">+<span id="LC794" 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;">"out-of-scope variable"</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">plural</span> <span class="n" style="color: #333;">ns</span></span>
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<pre style="margin: 0;">+<span id="LC795" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">pprWithCommas</span> <span class="p">(</span><span class="n" style="color: #333;">quotes</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;">ns</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC796" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"All such variables must be bound on the LHS"</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC797" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC798" class="line" lang="haskell"><span class="n" style="color: #333;">rnTyFamInstDecl</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="LC799" 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="LC800" 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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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -927,58 +948,155 @@ Relevant tickets: #3699, #10586, #10982 and #11451.</td>
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<pre style="margin: 0;"> <span id="LC948" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC949" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Renaming associated types]</span></span>
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950
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<pre style="margin: 0;"> <span id="LC950" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">-<span id="LC930" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Check that the RHS of the decl mentions only type variables that are explicitly</span></span>
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<pre style="margin: 0;">-<span id="LC931" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">bound on the LHS. For example, this is not ok</span></span>
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932
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<pre style="margin: 0;">-<span id="LC932" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> class C a b where</span></span>
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933
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<pre style="margin: 0;">-<span id="LC933" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type F a x :: *</span></span>
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951
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<pre style="margin: 0;">+<span id="LC951" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">When renaming an associated type/data family instance, we must check that the</span></span>
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952
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<pre style="margin: 0;">+<span id="LC952" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">RHS of the declaration mentions only type variables that are bound on the LHS.</span></span>
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953
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<pre style="margin: 0;">+<span id="LC953" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here is a simple example of something we should reject:</span></span>
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954
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<pre style="margin: 0;">+<span id="LC954" class="line" lang="haskell"></span>
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955
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<pre style="margin: 0;">+<span id="LC955" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> class C a b where</span></span>
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956
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<pre style="margin: 0;">+<span id="LC956" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type family F a x</span></span>
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957
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<pre style="margin: 0;">+<span id="LC957" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance C Int Bool where</span></span>
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958
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<pre style="margin: 0;">+<span id="LC958" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type instance F Int x = z</span></span>
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959
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<pre style="margin: 0;">+<span id="LC959" class="line" lang="haskell"></span>
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960
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<pre style="margin: 0;">+<span id="LC960" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here, `z` is mentioned on the RHS of the associated instance without being</span></span>
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961
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<pre style="margin: 0;">+<span id="LC961" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">bound anywhere on the LHS. GHC will reject `z` as being out of scope without</span></span>
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962
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<pre style="margin: 0;">+<span id="LC962" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">much fuss.</span></span>
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963
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<pre style="margin: 0;">+<span id="LC963" class="line" lang="haskell"></span>
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964
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<pre style="margin: 0;">+<span id="LC964" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Things get slightly trickier when the instance header itself binds type</span></span>
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965
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<pre style="margin: 0;">+<span id="LC965" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">variables. Consider this example (adapted from #5515):</span></span>
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966
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<pre style="margin: 0;">+<span id="LC966" class="line" lang="haskell"></span>
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934
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967
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<pre style="margin: 0;"> <span id="LC967" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance C (p,q) r where</span></span>
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935
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<pre style="margin: 0;">-<span id="LC935" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type F (p,q) x = (x, r) -- BAD: mentions 'r'</span></span>
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936
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<pre style="margin: 0;">-<span id="LC936" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">c.f. #5515</span></span>
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937
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<pre style="margin: 0;">-<span id="LC937" class="line" lang="haskell"></span>
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938
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<pre style="margin: 0;">-<span id="LC938" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Kind variables, on the other hand, are allowed to be implicitly or explicitly</span></span>
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939
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<pre style="margin: 0;">-<span id="LC939" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">bound. As examples, this (#9574) is acceptable:</span></span>
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940
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<pre style="margin: 0;">-<span id="LC940" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> class Funct f where</span></span>
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941
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<pre style="margin: 0;">-<span id="LC941" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type Codomain f :: *</span></span>
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942
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<pre style="margin: 0;">-<span id="LC942" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance Funct ('KProxy :: KProxy o) where</span></span>
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943
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<pre style="margin: 0;">-<span id="LC943" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- o is implicitly bound by the kind signature</span></span>
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944
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<pre style="margin: 0;">-<span id="LC944" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- of the LHS type pattern ('KProxy)</span></span>
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945
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<pre style="margin: 0;">-<span id="LC945" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type Codomain 'KProxy = NatTr (Proxy :: o -> *)</span></span>
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946
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<pre style="margin: 0;">-<span id="LC946" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">And this (#14131) is also acceptable:</span></span>
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947
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<pre style="margin: 0;">-<span id="LC947" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data family Nat :: k -> k -> *</span></span>
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948
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<pre style="margin: 0;">-<span id="LC948" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- k is implicitly bound by an invisible kind pattern</span></span>
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949
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<pre style="margin: 0;">-<span id="LC949" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> newtype instance Nat :: (k -> *) -> (k -> *) -> * where</span></span>
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950
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<pre style="margin: 0;">-<span id="LC950" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Nat :: (forall xx. f xx -> g xx) -> Nat f g</span></span>
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951
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<pre style="margin: 0;">-<span id="LC951" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We could choose to disallow this, but then associated type families would not</span></span>
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952
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<pre style="margin: 0;">-<span id="LC952" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">be able to be as expressive as top-level type synonyms. For example, this type</span></span>
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953
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<pre style="margin: 0;">-<span id="LC953" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">synonym definition is allowed:</span></span>
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954
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<pre style="margin: 0;">-<span id="LC954" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type T = (Nothing :: Maybe a)</span></span>
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955
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<pre style="margin: 0;">-<span id="LC955" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">So for parity with type synonyms, we also allow:</span></span>
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956
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<pre style="margin: 0;">-<span id="LC956" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type family T :: Maybe a</span></span>
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957
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<pre style="margin: 0;">-<span id="LC957" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type instance T = (Nothing :: Maybe a)</span></span>
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958
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<pre style="margin: 0;">-<span id="LC958" class="line" lang="haskell"></span>
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959
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<pre style="margin: 0;">-<span id="LC959" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">All this applies only for *instance* declarations. In *class*</span></span>
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960
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<pre style="margin: 0;">-<span id="LC960" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">declarations there is no RHS to worry about, and the class variables</span></span>
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961
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<pre style="margin: 0;">-<span id="LC961" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">can all be in scope (#5862):</span></span>
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968
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<pre style="margin: 0;">+<span id="LC968" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type instance F (p,q) x = (x, r)</span></span>
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969
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<pre style="margin: 0;">+<span id="LC969" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC970" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If we look at the instance in isolation:</span></span>
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971
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<pre style="margin: 0;">+<span id="LC971" class="line" lang="haskell"></span>
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972
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<pre style="margin: 0;">+<span id="LC972" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type instance F (p,q) x = (x, r)</span></span>
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973
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<pre style="margin: 0;">+<span id="LC973" class="line" lang="haskell"></span>
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974
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<pre style="margin: 0;">+<span id="LC974" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Then it is evident that this is malformed, as `r` has no binding site. In the</span></span>
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975
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<pre style="margin: 0;">+<span id="LC975" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">context of the original program, however, `r` is technically in scope, as the</span></span>
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976
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<pre style="margin: 0;">+<span id="LC976" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">type variables from an instance header always scope over the associated type</span></span>
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977
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<pre style="margin: 0;">+<span id="LC977" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">family instances. So while `r` is technically in scope, it is nevertheless</span></span>
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978
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<pre style="margin: 0;">+<span id="LC978" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">extremely dodgy. See #18021 for an example of some of the bizarre behaviour</span></span>
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979
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<pre style="margin: 0;">+<span id="LC979" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that results from this dodginess.</span></span>
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980
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<pre style="margin: 0;">+<span id="LC980" class="line" lang="haskell"></span>
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981
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<pre style="margin: 0;">+<span id="LC981" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">To prevent these sorts of shenanigans, we reject programs like the one above</span></span>
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982
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<pre style="margin: 0;">+<span id="LC982" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with an extra validity check in rnFamEqn. For each type variable bound in the</span></span>
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983
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<pre style="margin: 0;">+<span id="LC983" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">parent instance head, we check if it is mentioned on the RHS of the associated</span></span>
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984
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<pre style="margin: 0;">+<span id="LC984" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">family instance but not bound on the LHS. If any of the instance-head-bound</span></span>
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985
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<pre style="margin: 0;">+<span id="LC985" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">variables meet these criteria, we throw an error.</span></span>
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986
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<pre style="margin: 0;">+<span id="LC986" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(See rnFamEqn.improperly_scoped for how this is implemented.)</span></span>
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987
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<pre style="margin: 0;">+<span id="LC987" class="line" lang="haskell"></span>
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988
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<pre style="margin: 0;">+<span id="LC988" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Some additional wrinkles:</span></span>
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989
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<pre style="margin: 0;">+<span id="LC989" class="line" lang="haskell"></span>
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990
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<pre style="margin: 0;">+<span id="LC990" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Because of the "stop-gap" Note [Implicit quantification in type synonyms] in</span></span>
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991
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<pre style="margin: 0;">+<span id="LC991" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> GHC.Rename.HsType, a variable does not have to be mentioned by name in the</span></span>
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992
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<pre style="margin: 0;">+<span id="LC992" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> LHS in order for it to be bound on the LHS. For example, GHC currently</span></span>
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993
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<pre style="margin: 0;">+<span id="LC993" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> accepts this:</span></span>
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994
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<pre style="margin: 0;">+<span id="LC994" class="line" lang="haskell"></span>
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995
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<pre style="margin: 0;">+<span id="LC995" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> class C2 a where</span></span>
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<pre style="margin: 0;">+<span id="LC996" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type F2 :: Maybe a</span></span>
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997
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<pre style="margin: 0;">+<span id="LC997" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance C2 a where</span></span>
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998
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<pre style="margin: 0;">+<span id="LC998" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type F2 = (Nothing :: Maybe a)</span></span>
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999
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<pre style="margin: 0;">+<span id="LC999" class="line" lang="haskell"></span>
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1000
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<pre style="margin: 0;">+<span id="LC1000" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Here, the kind variable `a` in the RHS of the F2 instance is implicitly</span></span>
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1001
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<pre style="margin: 0;">+<span id="LC1001" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> quantified by virtue of being mentioned in an outermost kind signature.</span></span>
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1002
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<pre style="margin: 0;">+<span id="LC1002" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (See Note [Implicit quantification in type synonyms] for more on this point.)</span></span>
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1003
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<pre style="margin: 0;">+<span id="LC1003" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> One could equivalently write the instance like so:</span></span>
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1004
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<pre style="margin: 0;">+<span id="LC1004" class="line" lang="haskell"></span>
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1005
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<pre style="margin: 0;">+<span id="LC1005" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance C2 a where</span></span>
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1006
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<pre style="margin: 0;">+<span id="LC1006" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type F2 @a = (Nothing :: Maybe a)</span></span>
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1007
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<pre style="margin: 0;">+<span id="LC1007" class="line" lang="haskell"></span>
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1008
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<pre style="margin: 0;">+<span id="LC1008" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The explicit result kinds in data family instances, which are also considered</span></span>
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1009
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<pre style="margin: 0;">+<span id="LC1009" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> to be part of the RHS, provide another example. This program (adapted</span></span>
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1010
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<pre style="margin: 0;">+<span id="LC1010" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> from #14131) is also accepted:</span></span>
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1011
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<pre style="margin: 0;">+<span id="LC1011" class="line" lang="haskell"></span>
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1012
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<pre style="margin: 0;">+<span id="LC1012" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> class C3 k where</span></span>
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1013
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<pre style="margin: 0;">+<span id="LC1013" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data Nat :: k -> k -> Type</span></span>
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1014
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<pre style="margin: 0;">+<span id="LC1014" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance C3 k where</span></span>
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1015
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<pre style="margin: 0;">+<span id="LC1015" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> newtype Nat :: (k -> Type) -> (k -> Type) -> Type where</span></span>
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1016
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<pre style="margin: 0;">+<span id="LC1016" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Nat :: (forall xx. f xx -> g xx) -> Nat f g</span></span>
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1017
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<pre style="margin: 0;">+<span id="LC1017" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- Alternatively,</span></span>
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1018
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<pre style="margin: 0;">+<span id="LC1018" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- newtype Nat @k :: (k -> Type) -> (k -> Type) -> Type where ...</span></span>
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1019
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<pre style="margin: 0;">+<span id="LC1019" class="line" lang="haskell"></span>
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1020
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<pre style="margin: 0;">+<span id="LC1020" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* This Note only applies to *instance* declarations. In *class* declarations</span></span>
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1021
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<pre style="margin: 0;">+<span id="LC1021" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> there is no RHS to worry about, and the class variables can all be in scope</span></span>
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1022
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<pre style="margin: 0;">+<span id="LC1022" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (#5862):</span></span>
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1023
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<pre style="margin: 0;">+<span id="LC1023" class="line" lang="haskell"></span>
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962
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1024
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<pre style="margin: 0;"> <span id="LC1024" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> class Category (x :: k -> k -> *) where</span></span>
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963
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1025
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<pre style="margin: 0;"> <span id="LC1025" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type Ob x :: k -> Constraint</span></span>
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964
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1026
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<pre style="margin: 0;"> <span id="LC1026" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> id :: Ob x a => x a a</span></span>
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965
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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;"> (.) :: (Ob x a, Ob x b, Ob x c) => x b c -> x a b -> x a c</span></span>
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966
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<pre style="margin: 0;">-<span id="LC966" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here 'k' is in scope in the kind signature, just like 'x'.</span></span>
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967
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1028
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<pre style="margin: 0;"> <span id="LC1028" class="line" lang="haskell"></span>
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968
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<pre style="margin: 0;">-<span id="LC968" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Although type family equations can bind type variables with explicit foralls,</span></span>
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969
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<pre style="margin: 0;">-<span id="LC969" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">it need not be the case that all variables that appear on the RHS must be bound</span></span>
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970
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<pre style="margin: 0;">-<span id="LC970" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">by a forall. For instance, the following is acceptable:</span></span>
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1029
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<pre style="margin: 0;">+<span id="LC1029" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Here 'k' is in scope in the kind signature, just like 'x'.</span></span>
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1030
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<pre style="margin: 0;">+<span id="LC1030" class="line" lang="haskell"></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;">* Although type family equations can bind type variables with explicit foralls,</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;"> it need not be the case that all variables that appear on the RHS must be</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;"> bound by a forall. For instance, the following is acceptable:</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;"> class C4 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 T4 a b</span></span>
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1037
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<pre style="margin: 0;">+<span id="LC1037" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance C4 (Maybe a) where</span></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;"> type forall b. T4 (Maybe a) b = Either a b</span></span>
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1039
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<pre style="margin: 0;">+<span id="LC1039" class="line" lang="haskell"></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;"> Even though `a` is not bound by the forall, this is still accepted because `a`</span></span>
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1041
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<pre style="margin: 0;">+<span id="LC1041" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> was previously bound by the `instance C4 (Maybe a)` part. (see #16116).</span></span>
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1042
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<pre style="margin: 0;">+<span id="LC1042" class="line" lang="haskell"></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;">* In addition to the validity check in rnFamEqn.improperly_scoped, there is an</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;"> additional check in GHC.Tc.Validity.checkFamPatBinders that checks each family</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;"> instance equation for type variables used on the RHS but not bound on the</span></span>
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1046
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<pre style="margin: 0;">+<span id="LC1046" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> LHS. This is not made redundant by rmFamEqn.improperly_scoped, as there are</span></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;"> programs that each check will reject that the other check will not catch:</span></span>
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1048
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<pre style="margin: 0;">+<span id="LC1048" class="line" lang="haskell"></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;"> - checkValidFamPats is used on all forms of family instances, whereas</span></span>
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1050
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<pre style="margin: 0;">+<span id="LC1050" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> rmFamEqn.improperly_scoped only checks associated family instances. Since</span></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;"> checkFamPatBinders occurs after typechecking, it can catch programs that</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;"> introduce dodgy scoping by way of type synonyms (see #7536), which is</span></span>
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1053
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<pre style="margin: 0;">+<span id="LC1053" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> impractical to accomplish in the renamer.</span></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;"> - rnFamEqn.improperly_scoped catches some programs that, if allowed to escape</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;"> the renamer, would accidentally be accepted by the typechecker. Here is one</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;"> such program (#18021):</span></span>
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1057
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<pre style="margin: 0;">+<span id="LC1057" class="line" lang="haskell"></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;"> class C5 a where</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;"> data family D a</span></span>
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1060
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<pre style="margin: 0;">+<span id="LC1060" class="line" lang="haskell"></span>
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1061
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<pre style="margin: 0;">+<span id="LC1061" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance forall a. C5 Int where</span></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;"> data instance D Int = MkD a</span></span>
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1063
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<pre style="margin: 0;">+<span id="LC1063" class="line" lang="haskell"></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;"> If this is not rejected in the renamer, the typechecker would treat this</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;"> program as though the `a` were existentially quantified, like so:</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;"> data instance D Int = forall a. MkD a</span></span>
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1068
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<pre style="margin: 0;">+<span id="LC1068" class="line" lang="haskell"></span>
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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;"> This is likely not what the user intended!</span></span>
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1070
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<pre style="margin: 0;">+<span id="LC1070" class="line" lang="haskell"></span>
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1071
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<pre style="margin: 0;">+<span id="LC1071" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Here is another such program (#9574):</span></span>
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1072
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<pre style="margin: 0;">+<span id="LC1072" class="line" lang="haskell"></span>
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1073
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<pre style="margin: 0;">+<span id="LC1073" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> class Funct f where</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;"> type Codomain f</span></span>
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1075
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<pre style="margin: 0;">+<span id="LC1075" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance Funct ('KProxy :: KProxy o) where</span></span>
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1076
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<pre style="margin: 0;">+<span id="LC1076" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type Codomain 'KProxy = NatTr (Proxy :: o -> Type)</span></span>
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1077
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<pre style="margin: 0;">+<span id="LC1077" class="line" lang="haskell"></span>
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1078
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<pre style="margin: 0;">+<span id="LC1078" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Where:</span></span>
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1079
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<pre style="margin: 0;">+<span id="LC1079" class="line" lang="haskell"></span>
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1080
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<pre style="margin: 0;">+<span id="LC1080" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data Proxy (a :: k) = Proxy</span></span>
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1081
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<pre style="margin: 0;">+<span id="LC1081" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data KProxy (t :: Type) = KProxy</span></span>
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1082
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<pre style="margin: 0;">+<span id="LC1082" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data NatTr (c :: o -> Type)</span></span>
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971
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1083
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<pre style="margin: 0;"> <span id="LC1083" class="line" lang="haskell"></span>
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972
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<pre style="margin: 0;">-<span id="LC972" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> class C a where</span></span>
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973
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<pre style="margin: 0;">-<span id="LC973" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type T a b</span></span>
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974
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<pre style="margin: 0;">-<span id="LC974" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance C (Maybe a) where</span></span>
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975
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<pre style="margin: 0;">-<span id="LC975" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type forall b. T (Maybe a) b = Either a b</span></span>
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1084
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<pre style="margin: 0;">+<span id="LC1084" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Note that the `o` in the `Codomain 'KProxy` instance should be considered</span></span>
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1085
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<pre style="margin: 0;">+<span id="LC1085" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> improperly scoped. It does not meet the criteria for being explicitly</span></span>
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1086
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<pre style="margin: 0;">+<span id="LC1086" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> quantified, as it is not mentioned by name on the LHS, nor does it meet the</span></span>
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1087
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<pre style="margin: 0;">+<span id="LC1087" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> criteria for being implicitly quantified, as it is used in a RHS kind</span></span>
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1088
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<pre style="margin: 0;">+<span id="LC1088" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> signature that is not outermost (see Note [Implicit quantification in type</span></span>
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<pre style="margin: 0;">+<span id="LC1089" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> synonyms]). However, `o` /is/ bound by the instance header, so if this</span></span>
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1090
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<pre style="margin: 0;">+<span id="LC1090" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> program is not rejected by the renamer, the typechecker would treat it as</span></span>
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1091
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<pre style="margin: 0;">+<span id="LC1091" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> though you had written this:</span></span>
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976
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1092
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<pre style="margin: 0;"> <span id="LC1092" class="line" lang="haskell"></span>
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977
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<pre style="margin: 0;">-<span id="LC977" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">Even though `a` is not bound by the forall, this is still accepted because `a`</span></span></span>
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978
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<pre style="margin: 0;">-<span id="LC978" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">was previously bound by the `instance C (Maybe a)` part. (see #16116).</span></span></span>
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1093
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<pre style="margin: 0;">+<span id="LC1093" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right"> instance Funct ('KProxy :: KProxy o) where</span></span></span>
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<pre style="margin: 0;">+<span id="LC1094" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right"> type Codomain ('KProxy @o) = NatTr (Proxy :: o -> Type)</span></span></span>
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979
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1095
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<pre style="margin: 0;"> <span id="LC1095" class="line" lang="haskell"></span>
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980
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<pre style="margin: 0;">-<span id="LC980" 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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981
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<pre style="margin: 0;">-<span id="LC981" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is GHC.Tc.Validity.checkValidFamPats.</span></span>
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<pre style="margin: 0;">+<span id="LC1096" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Although this is a valid program, it's probably a stretch too far to turn</span></span>
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1097
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<pre style="margin: 0;">+<span id="LC1097" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> `type Codomain 'KProxy = ...` into `type Codomain ('KProxy @o) = ...` here.</span></span>
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1098
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<pre style="margin: 0;">+<span id="LC1098" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> If the user really wants the latter, it is simple enough to communicate</span></span>
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<pre style="margin: 0;">+<span id="LC1099" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> their intent by mentioning `o` on the LHS by name.</span></span>
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1100
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<pre style="margin: 0;"> <span id="LC1100" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1101" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Type family equations and occurrences]</span></span>
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<pre style="margin: 0;"> <span id="LC1102" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</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">@@ -14,6 +14,35 @@ Language</td>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="plaintext"> (Serrano et al, ICFP 2020). More information here: :ref:`impredicative-polymorphism`.</span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="plaintext"> This replaces the old (undefined, flaky) behaviour of the :extension:`ImpredicativeTypes` extension.</span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="plaintext">* GHC is stricter about checking for out-of-scope type variables on the</span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext"> right-hand sides of associated type family instances that are not bound on</span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="plaintext"> the left-hand side. As a result, some programs that were accidentally</span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="plaintext"> accepted in previous versions of GHC will now be rejected, such as this</span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="plaintext"> example: ::</span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="plaintext"> class Funct f where</span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="plaintext"> type Codomain f</span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="plaintext"> instance Funct ('KProxy :: KProxy o) where</span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="plaintext"> type Codomain 'KProxy = NatTr (Proxy :: o -> Type)</span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="plaintext"> Where: ::</span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="plaintext"> data Proxy (a :: k) = Proxy</span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="plaintext"> data KProxy (t :: Type) = KProxy</span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="plaintext"> data NatTr (c :: o -> Type)</span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="plaintext"> GHC will now reject the ``o`` on the right-hand side of the ``Codomain``</span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="plaintext"> instance as being out of scope, as it does not meet the requirements for</span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="plaintext"> being explicitly bound (as it is not mentioned on the left-hand side) nor</span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="plaintext"> implicitly bound (as it is not mentioned in an *outermost* kind signature,</span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="plaintext"> as required by :ref:`scoping-class-params`). This program can be repaired in</span>
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="plaintext"> a backwards-compatible way by mentioning ``o`` on the left-hand side: ::</span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC41" class="line" lang="plaintext"> instance Funct ('KProxy :: KProxy o) where</span>
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<pre style="margin: 0;">+<span id="LC42" class="line" lang="plaintext"> type Codomain ('KProxy @o) = NatTr (Proxy :: o -> Type)</span>
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<pre style="margin: 0;">+<span id="LC43" class="line" lang="plaintext"> -- Alternatively,</span>
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<pre style="margin: 0;">+<span id="LC44" class="line" lang="plaintext"> -- type Codomain ('KProxy :: KProxy o) = NatTr (Proxy :: o -> Type)</span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="plaintext">Compiler</span>
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18
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="plaintext">~~~~~~~~</span>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="plaintext"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/96ad03e1e9a417ee9201f89968a760da0fb2d683#905edd9556ba05c7a7d1f0669bfca9828807ed32"><strong>testsuite/tests/indexed-types/should_fail/T5515.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">T5515.hs:6:16: error:</span>
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3
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • Expecting one more argument to ‘ctx’</span>
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4
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> Expected a type, but ‘ctx’ has kind ‘* -> Constraint’</span>
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5
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> • In the first argument of ‘Arg’, namely ‘ctx’</span>
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext"> In the first argument of ‘ctx’, namely ‘(Arg ctx)’</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 ‘Bome’</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T5515.hs:9:3: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> The RHS of an associated type declaration mentions out-of-scope variable ‘a’</span>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> All such variables must be bound on the LHS</span>
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8
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5
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"></span>
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9
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<pre style="margin: 0;">-<span id="LC9" class="line" lang="plaintext">T5515.hs:14:1: error:</span>
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10
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<pre style="margin: 0;">-<span id="LC10" class="line" lang="plaintext"> • Type variable ‘a’ is mentioned in the RHS,</span>
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11
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<pre style="margin: 0;">-<span id="LC11" class="line" lang="plaintext"> but not bound on the LHS of the family instance</span>
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12
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<pre style="margin: 0;">-<span id="LC12" class="line" lang="plaintext"> • In the type instance declaration for ‘Arg’</span>
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13
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<pre style="margin: 0;">-<span id="LC13" class="line" lang="plaintext"> In the instance declaration for ‘Some f’</span>
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14
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<pre style="margin: 0;">-<span id="LC14" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC15" class="line" lang="plaintext">T5515.hs:14:10: error:</span>
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<pre style="margin: 0;">-<span id="LC16" class="line" lang="plaintext"> • Could not deduce (C f a0)</span>
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<pre style="margin: 0;">-<span id="LC17" class="line" lang="plaintext"> from the context: C f a</span>
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<pre style="margin: 0;">-<span id="LC18" class="line" lang="plaintext"> bound by an instance declaration:</span>
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<pre style="margin: 0;">-<span id="LC19" class="line" lang="plaintext"> forall f a. C f a => Some f</span>
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<pre style="margin: 0;">-<span id="LC20" class="line" lang="plaintext"> at T5515.hs:14:10-24</span>
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<pre style="margin: 0;">-<span id="LC21" class="line" lang="plaintext"> The type variable ‘a0’ is ambiguous</span>
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<pre style="margin: 0;">-<span id="LC22" class="line" lang="plaintext"> • In the ambiguity check for an instance declaration</span>
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<pre style="margin: 0;">-<span id="LC23" class="line" lang="plaintext"> To defer the ambiguity check to use sites, enable AllowAmbiguousTypes</span>
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<pre style="margin: 0;">-<span id="LC24" class="line" lang="plaintext"> In the instance declaration for ‘Some f’</span></pre>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext">T5515.hs:15:3: error:</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> The RHS of an associated type declaration mentions out-of-scope variable ‘a’</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext"> All such variables must be bound on the LHS</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/96ad03e1e9a417ee9201f89968a760da0fb2d683#3c2d2e698cec41f8cd53fa12a38d89e5ec69edde"><strong>testsuite/tests/polykinds/T9574.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">T9574.hs:13:5: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> The RHS of an associated type declaration mentions out-of-scope variable ‘o’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> All such variables must be bound on the LHS</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/96ad03e1e9a417ee9201f89968a760da0fb2d683#37bb83d0a916288b2296ba25cdbbef228eed6484"><strong>testsuite/tests/polykinds/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">@@ -107,7 +107,7 @@ test('T9725', normal, compile, [''])</td>
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107
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<pre style="margin: 0;"> <span id="LC107" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T9750</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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108
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108
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<pre style="margin: 0;"> <span id="LC108" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T9569</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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109
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<pre style="margin: 0;"> <span id="LC109" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T9838</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">multimod_compile</span><span class="p">,</span> <span class="p">['</span><span class="s1" style="color: #d14;">T9838.hs</span><span class="p">','</span><span class="s1" style="color: #d14;">-v0</span><span class="p">'])</span></span>
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110
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<pre style="margin: 0;">-<span id="LC110" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T9574</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="LC110" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T9574</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 class="idiff left right">_fail</span></span><span class="p">,</span> <span class="p">[''])</span></span>
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111
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111
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<pre style="margin: 0;"> <span id="LC111" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T9833</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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112
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112
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<pre style="margin: 0;"> <span id="LC112" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T7908</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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113
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113
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<pre style="margin: 0;"> <span id="LC113" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">PolyInstances</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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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/96ad03e1e9a417ee9201f89968a760da0fb2d683#089da87ed5899aea05128c866a6ef5662ee6fcf7"><strong>testsuite/tests/rename/should_fail/T18021.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 DeriveAnyClass #-}</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;">{-# LANGUAGE ExistentialQuantification #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE MultiParamTypeClasses #-}</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE ScopedTypeVariables #-}</span></span>
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5
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<pre style="margin: 0;">+<span id="LC5" 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="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T18021</span> <span class="kr" style="font-weight: 600;">where</span></span>
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7
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"></span>
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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;">class</span> <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="n" style="color: #333;">a</span> <span class="kr" style="font-weight: 600;">where</span></span>
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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;">data</span> <span class="kt" style="color: #458; font-weight: 600;">D</span> <span class="n" style="color: #333;">a</span></span>
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10
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="kr" style="font-weight: 600;">where</span></span>
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12
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">data</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">D</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;">MkD1</span> <span class="n" style="color: #333;">a</span></span>
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13
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"></span>
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14
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">X</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span></span>
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15
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"></span>
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16
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="kr" style="font-weight: 600;">where</span></span>
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17
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">data</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">D</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkD2</span></span>
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18
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">X</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span></pre>
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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">T18021.hs:12:3: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> The RHS of an associated type declaration mentions out-of-scope variable ‘a’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> All such variables must be bound on the LHS</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext">T18021.hs:17:3: error:</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> The RHS of an associated type declaration mentions out-of-scope variable ‘a’</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext"> All such variables must be bound on the LHS</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/96ad03e1e9a417ee9201f89968a760da0fb2d683#c2554d4efde41e6e193f728122336449d2cb5fc5"><strong>testsuite/tests/rename/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">@@ -156,6 +156,7 @@ test('T16504', normal, compile_fail, [''])</td>
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156
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156
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<pre style="margin: 0;"> <span id="LC156" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T14548</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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157
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157
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<pre style="margin: 0;"> <span id="LC157" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T16610</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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158
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158
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<pre style="margin: 0;"> <span id="LC158" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17593</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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159
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<pre style="margin: 0;">+<span id="LC159" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18021</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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159
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<td class="diff-line-num new_line" data-linenumber="160" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
160
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<pre style="margin: 0;"> <span id="LC160" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18145</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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160
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<td class="diff-line-num new_line" data-linenumber="161" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
161
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<pre style="margin: 0;"> <span id="LC161" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18240a</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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161
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<td class="diff-line-num new_line" data-linenumber="162" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
162
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<pre style="margin: 0;"> <span id="LC162" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18240b</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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