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<h3>
Marge Bot pushed to branch master
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5feb9b2dad0ce609e3cfb537a6ca758a09a6898e">5feb9b2d</a></strong>
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<span>by Ryan Scott</span>
<i>at 2020-12-11T22:39:29-05:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Delete outdated Note [Kind-checking tyvar binders for associated types]
This Note has severely bitrotted, as it has no references anywhere in the
codebase, and none of the functions that it mentions exist anymore. Let's just
delete this. While I was in town, I deleted some outdated comments from
`checkFamPatBinders` of a similar caliber.
Fixes #19008.
[ci skip]
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<h4>2 changed files:</h4>
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<a href="#9355bef855426caf5f526925edf351b20f9a86c4">
compiler/GHC/Tc/Gen/HsType.hs
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<a href="#1db07ed8cd9bab6b217a8f5a140176d3cb8672fd">
compiler/GHC/Tc/Validity.hs
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<h4>Changes:</h4>
<li id="9355bef855426caf5f526925edf351b20f9a86c4">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5feb9b2dad0ce609e3cfb537a6ca758a09a6898e#9355bef855426caf5f526925edf351b20f9a86c4"><strong>compiler/GHC/Tc/Gen/HsType.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">@@ -2819,24 +2819,6 @@ But notice that (#16322 comment:3)</td>
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<pre style="margin: 0;"> <span id="LC2819" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> although T3 is really polymorphic-recursive too.</span></span>
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<pre style="margin: 0;"> <span id="LC2820" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Perhaps we should somehow reject that.</span></span>
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<pre style="margin: 0;"> <span id="LC2821" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2822" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Kind-checking tyvar binders for associated types]</span></span>
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<pre style="margin: 0;">-<span id="LC2823" 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="LC2824" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">When kind-checking the type-variable binders for associated</span></span>
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<pre style="margin: 0;">-<span id="LC2825" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data/newtype decls</span></span>
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<pre style="margin: 0;">-<span id="LC2826" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> family decls</span></span>
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<pre style="margin: 0;">-<span id="LC2827" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we behave specially for type variables that are already in scope;</span></span>
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<pre style="margin: 0;">-<span id="LC2828" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that is, bound by the enclosing class decl. This is done in</span></span>
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<pre style="margin: 0;">-<span id="LC2829" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">kcLHsQTyVarBndrs:</span></span>
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<pre style="margin: 0;">-<span id="LC2830" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * The use of tcImplicitQTKBndrs</span></span>
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<pre style="margin: 0;">-<span id="LC2831" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * The tcLookupLocal_maybe code in kc_hs_tv</span></span>
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<pre style="margin: 0;">-<span id="LC2832" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2833" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See Note [Associated type tyvar names] in GHC.Core.Class and</span></span>
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<pre style="margin: 0;">-<span id="LC2834" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Note [TyVar binders for associated decls] in GHC.Hs.Decls</span></span>
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<pre style="margin: 0;">-<span id="LC2835" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2836" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We must do the same for family instance decls, where the in-scope</span></span>
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<pre style="margin: 0;">-<span id="LC2837" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">variables may be bound by the enclosing class instance decl.</span></span>
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<pre style="margin: 0;">-<span id="LC2838" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Hence the use of tcImplicitQTKBndrs in tcFamTyPatsAndGen.</span></span>
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<pre style="margin: 0;">-<span id="LC2839" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2822" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Kind variable ordering for associated types]</span></span>
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<pre style="margin: 0;"> <span id="LC2823" 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="LC2824" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">What should be the kind of `T` in the following example? (#15591)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5feb9b2dad0ce609e3cfb537a6ca758a09a6898e#1db07ed8cd9bab6b217a8f5a140176d3cb8672fd"><strong>compiler/GHC/Tc/Validity.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2263,12 +2263,6 @@ checkFamPatBinders :: TyCon</td>
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<pre style="margin: 0;"> <span id="LC2263" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">]</span> <span class="c1" style="color: #998; font-style: italic;">-- LHS patterns</span></span>
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<pre style="margin: 0;"> <span id="LC2264" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="c1" style="color: #998; font-style: italic;">-- RHS</span></span>
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<pre style="margin: 0;"> <span id="LC2265" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">-<span id="LC2266" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We do these binder checks now, in tcFamTyPatsAndGen, rather</span></span>
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2267
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<pre style="margin: 0;">-<span id="LC2267" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- than later, in checkValidFamEqn, for two reasons:</span></span>
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<pre style="margin: 0;">-<span id="LC2268" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- - We have the implicitly and explicitly</span></span>
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<pre style="margin: 0;">-<span id="LC2269" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- bound type variables conveniently to hand</span></span>
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<pre style="margin: 0;">-<span id="LC2270" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- - If implicit variables are out of scope it may</span></span>
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<pre style="margin: 0;">-<span id="LC2271" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- cause a crash; notably in tcConDecl in tcDataFamInstDecl</span></span>
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<pre style="margin: 0;"> <span id="LC2266" class="line" lang="haskell"><span class="n" style="color: #333;">checkFamPatBinders</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">qtvs</span> <span class="n" style="color: #333;">pats</span> <span class="n" style="color: #333;">rhs</span></span>
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<pre style="margin: 0;"> <span id="LC2267" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"checkFamPatBinders"</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;"> <span id="LC2268" class="line" lang="haskell"> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">debugPprType</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyConApp</span> <span class="n" style="color: #333;">fam_tc</span> <span class="n" style="color: #333;">pats</span><span class="p">)</span></span>
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