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<h3>
Simon Peyton Jones pushed to branch wip/T16728
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/35bea7827a5fa750c4d09887913a9da6a8572bf9">35bea782</a></strong>
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<span>by Simon Peyton Jones</span>
<i>at 2019-06-07T10:08:36Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix a lurking bug in typechecking ($)
My partial-sigs patch revealed that the code in `TcExpr`
that implements the special typing rule for `($)` was wrong.
It called `getRuntimeRep` in a situation where where was no
particular reason to suppose that the thing had kind `TYPE r`.
This caused a crash in typecheck/should_run/T10846.
The fix was easy, and actually simplifies the code in `TcExpr`
quite a bit. Hooray.
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<h4>1 changed file:</h4>
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<a href="#3668e5951898e1cee434d7e6fb5a139287ebe70d">
compiler/typecheck/TcExpr.hs
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<h4>Changes:</h4>
<li id="3668e5951898e1cee434d7e6fb5a139287ebe70d">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/35bea7827a5fa750c4d09887913a9da6a8572bf9#3668e5951898e1cee434d7e6fb5a139287ebe70d"><strong>compiler/typecheck/TcExpr.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">@@ -378,42 +378,35 @@ tcExpr expr@(OpApp fix arg1 op arg2) res_ty</td>
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<pre style="margin: 0;"> <span id="LC378" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- So: arg1_ty = arg2_ty -> op_res_ty</span></span>
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<pre style="margin: 0;"> <span id="LC379" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- where arg2_sigma maybe polymorphic; that's the point</span></span>
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<pre style="margin: 0;"> <span id="LC380" class="line" lang="haskell"></span>
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381
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<pre style="margin: 0;">-<span id="LC381" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">arg2'</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcArg</span> <span class="n" style="color: #333;">op</span> <span class="n" style="color: #333;">arg2</span> <span class="n" style="color: #333;">arg2_sigma</span> <span class="mi" style="color: #099;">2</span></span>
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<pre style="margin: 0;">+<span id="LC381" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">arg2'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcArg</span> <span class="n" style="color: #333;">op</span> <span class="n" style="color: #333;">arg2</span> <span class="n" style="color: #333;">arg2_sigma</span> <span class="mi" style="color: #099;">2</span></span>
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382
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<pre style="margin: 0;"> <span id="LC382" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC383" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Make sure that the argument type has kind '*'</span></span>
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<pre style="margin: 0;"> <span id="LC384" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ($) :: forall (r:RuntimeRep) (a:*) (b:TYPE r). (a->b) -> a -> b</span></span>
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<pre style="margin: 0;"> <span id="LC385" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Eg we do not want to allow (D# $ 4.0#) #5570</span></span>
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<pre style="margin: 0;"> <span id="LC386" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (which gives a seg fault)</span></span>
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<pre style="margin: 0;">-<span id="LC387" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">-<span id="LC388" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The *result* type can have any kind (#8739),</span></span>
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389
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<pre style="margin: 0;">-<span id="LC389" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- so we don't need to check anything for that</span></span>
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<pre style="margin: 0;"> <span id="LC387" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unifyKind</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XHsType</span> <span class="o" style="font-weight: 600;">$</span> <span class="kt" style="color: #458; font-weight: 600;">NHsCoreTy</span> <span class="n" style="color: #333;">arg2_sigma</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC388" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">tcTypeKind</span> <span class="n" style="color: #333;">arg2_sigma</span><span class="p">)</span> <span class="n" style="color: #333;">liftedTypeKind</span></span>
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392
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<pre style="margin: 0;">-<span id="LC392" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">i</span>gnore the evidence. arg2_sigma must have type * or #,</span></span>
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<pre style="margin: 0;">-<span id="LC393" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- because we know <span class="idiff left right">arg2_sigma -> or_res_ty</span> is well-kinded</span></span>
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<pre style="margin: 0;">+<span id="LC389" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">I</span>gnore the evidence. arg2_sigma must have type * or #,</span></span>
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<pre style="margin: 0;">+<span id="LC390" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- because we know <span class="idiff left right">(arg2_sigma -> op_res_ty)</span> is well-kinded</span></span>
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<pre style="margin: 0;"> <span id="LC391" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (because otherwise matchActualFunTys would fail)</span></span>
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<pre style="margin: 0;">-<span id="LC395" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- There's no possibility here of, say, a kind family reducing to *.</span></span>
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<pre style="margin: 0;">+<span id="LC392" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- So this 'unifyKind' will either succeed with Refl, or will</span></span>
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<pre style="margin: 0;">+<span id="LC393" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- produce an insoluble constraint * ~ #, which we'll report later.</span></span>
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<pre style="margin: 0;"> <span id="LC394" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC397" class="line" lang="haskell"> <span class="p"><span class="idiff left">;</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">wrap_res</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">tcSubTypeHR</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">orig1</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Just</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">expr</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">op_res_ty</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">res_ty</span></span></span>
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<pre style="margin: 0;">-<span id="LC398" class="line" lang="haskell"> <span class="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- op_res -> res</span></span></span>
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<pre style="margin: 0;">+<span id="LC395" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">-- NB: unlike the argument type, the *result* type, op_res_ty can</span></span></span>
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<pre style="margin: 0;">+<span id="LC396" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">-- have any kind (#8739), so we don't need to check anything for that</span></span></span>
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<pre style="margin: 0;"> <span id="LC397" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC398" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">op_id</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcLookupId</span> <span class="n" style="color: #333;">op_name</span></span>
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<pre style="margin: 0;">-<span id="LC401" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">res_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">readExpType</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;">-<span id="LC402" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">op'</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="n" style="color: #333;">mkHsWrap</span> <span class="p">(</span><span class="n" style="color: #333;">mkWpTyApps</span> <span class="p">[</span> <span class="n" style="color: #333;">getRuntimeRep</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;">+<span id="LC399" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">op'</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="n" style="color: #333;">mkHsWrap</span> <span class="p">(</span><span class="n" style="color: #333;">mkWpTyApps</span> <span class="p">[</span> <span class="n" style="color: #333;">getRuntimeRep</span> <span class="n" style="color: #333;">op_res_ty</span></span>
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<pre style="margin: 0;"> <span id="LC400" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">arg2_sigma</span></span>
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<pre style="margin: 0;">-<span id="LC404" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">])</span></span>
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<pre style="margin: 0;">+<span id="LC401" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;"><span class="idiff left right">op_</span>res_ty</span><span class="p">])</span></span>
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<pre style="margin: 0;"> <span id="LC402" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsVar</span> <span class="n" style="color: #333;">noExt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">lv</span> <span class="n" style="color: #333;">op_id</span><span class="p">)))</span></span>
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<pre style="margin: 0;"> <span id="LC403" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- arg1' :: arg1_ty</span></span>
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<pre style="margin: 0;"> <span id="LC404" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- wrap_arg1 :: arg1_ty "->" (arg2_sigma -> op_res_ty)</span></span>
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<pre style="margin: 0;">-<span id="LC408" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- wrap_res :: op_res_ty "->" res_ty</span></span>
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<pre style="margin: 0;">-<span id="LC409" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- op' :: (a2_ty -> res_ty) -> a2_ty -> res_ty</span></span>
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<pre style="margin: 0;">+<span id="LC405" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- op' :: (a2_ty -> op_res_ty) -> a2_ty -> op_res_ty</span></span>
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<pre style="margin: 0;"> <span id="LC406" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC411" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- wrap1 :: arg1_ty "->" (arg2_sigma -> res_ty)</span></span>
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<pre style="margin: 0;">-<span id="LC412" class="line" lang="haskell"> <span class="n" style="color: #333;">wrap1</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkWpFun</span> <span class="n" style="color: #333;">idHsWrapper</span> <span class="n" style="color: #333;">wrap_res</span> <span class="n" style="color: #333;">arg2_sigma</span> <span class="n" style="color: #333;">res_ty</span> <span class="n" style="color: #333;">doc</span></span>
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<pre style="margin: 0;">-<span id="LC413" class="line" lang="haskell"> <span class="o" style="font-weight: 600;"><.></span> <span class="n" style="color: #333;">wrap_arg1</span></span>
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<pre style="margin: 0;">-<span id="LC414" class="line" lang="haskell"> <span class="n" style="color: #333;">doc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"When looking at the argument to ($)"</span></span>
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<pre style="margin: 0;">+<span id="LC407" class="line" lang="haskell"> <span class="n" style="color: #333;">expr'</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">OpApp</span> <span class="n" style="color: #333;">fix</span> <span class="p">(</span><span class="n" style="color: #333;">mkLHsWrap</span> <span class="n" style="color: #333;">wrap_arg1</span> <span class="n" style="color: #333;">arg1'</span><span class="p">)</span> <span class="n" style="color: #333;">op'</span> <span class="n" style="color: #333;">arg2'</span></span>
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<pre style="margin: 0;"> <span id="LC408" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC416" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;"><span class="idiff left">return</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">OpApp</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">fix</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">mkLHsWrap</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">wrap1</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">arg1'</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">op'</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">arg2'</span></span><span class="p"><span class="idiff right">)</span></span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC409" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;"><span class="idiff left">tcWrapResult</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">expr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">expr'</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">op_res_ty</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">res_ty</span></span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC410" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC411" 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;">L</span> <span class="n" style="color: #333;">loc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsRecFld</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ambiguous</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">lbl</span><span class="p">)))</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">op</span></span>
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<pre style="margin: 0;"> <span id="LC412" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">sig_ty</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">obviousSig</span> <span class="p">(</span><span class="n" style="color: #333;">unLoc</span> <span class="n" style="color: #333;">arg1</span><span class="p">)</span></span>
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