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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/598efac59cde44706761048aeb47e624da1f5b22">598efac5</a></strong>
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<span>by Simon Peyton Jones</span>
<i>at 2019-06-06T20:03:38Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">wibbles
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<h4>4 changed files:</h4>
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<a href="#9f8e9eab0dc8b12ae9f92fbb76ddca15c817667a">
compiler/typecheck/TcCanonical.hs
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<a href="#350c4076427c611b8f14e875a4ca553041c2b847">
compiler/typecheck/TcHsType.hs
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<a href="#341aef35ac370771edf59ec6b9fbb31507fa6f18">
compiler/typecheck/TcSigs.hs
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<li class="file-stats">
<a href="#341fd962c5f2c9fcf8be3dbdaa9a14ee1538af07">
compiler/typecheck/TcType.hs
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<h4>Changes:</h4>
<li id="9f8e9eab0dc8b12ae9f92fbb76ddca15c817667a">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/598efac59cde44706761048aeb47e624da1f5b22#9f8e9eab0dc8b12ae9f92fbb76ddca15c817667a"><strong>compiler/typecheck/TcCanonical.hs</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1008" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1008" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -1008,6 +1008,8 @@ can_eq_nc_forall ev eq_rel s1 s2</td>
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1008
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1008
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<pre style="margin: 0;"> <span id="LC1008" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">substTy</span> <span class="n" style="color: #333;">subst</span> <span class="p">(</span><span class="n" style="color: #333;">tyVarKind</span> <span class="n" style="color: #333;">tv2</span><span class="p">))</span></span>
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1009
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1009
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<pre style="margin: 0;"> <span id="LC1009" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">subst'</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">extendTvSubstAndInScope</span> <span class="n" style="color: #333;">subst</span> <span class="n" style="color: #333;">tv2</span></span>
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<td class="diff-line-num old_line" data-linenumber="1010" 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">
1010
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1010
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<pre style="margin: 0;"> <span id="LC1010" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">mkCastTy</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyVarTy</span> <span class="n" style="color: #333;">skol_tv</span><span class="p">)</span> <span class="n" style="color: #333;">kind_co</span><span class="p">)</span></span>
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1011
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<pre style="margin: 0;">+<span id="LC1011" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- skol_tv is already in the in-scope set, but the</span></span>
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1012
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<pre style="margin: 0;">+<span id="LC1012" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- free vars of kind_co are not; hence "...AndInScope"</span></span>
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1011
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1013
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<pre style="margin: 0;"> <span id="LC1013" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">co</span><span class="p">,</span> <span class="n" style="color: #333;">wanteds2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">skol_tvs</span> <span class="n" style="color: #333;">subst'</span> <span class="n" style="color: #333;">bndrs2</span></span>
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1012
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1014
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<pre style="margin: 0;"> <span id="LC1014" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span> <span class="n" style="color: #333;">mkTcForAllCo</span> <span class="n" style="color: #333;">skol_tv</span> <span class="n" style="color: #333;">kind_co</span> <span class="n" style="color: #333;">co</span></span>
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1013
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1015
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<pre style="margin: 0;"> <span id="LC1015" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">wanteds1</span> <span class="p">`</span><span class="n" style="color: #333;">unionBags</span><span class="p">`</span> <span class="n" style="color: #333;">wanteds2</span> <span class="p">)</span> <span class="p">}</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/598efac59cde44706761048aeb47e624da1f5b22#350c4076427c611b8f14e875a4ca553041c2b847"><strong>compiler/typecheck/TcHsType.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">@@ -863,7 +863,7 @@ regardless of whether PartialTypeSignatures is enabled or not. But how would</td>
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863
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863
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<pre style="margin: 0;"> <span id="LC863" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the typechecker know which '_' is being used in VKA and which is not when it</span></span>
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864
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<pre style="margin: 0;"> <span id="LC864" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">calls emitNamedWildCardHoleConstraints in tcHsPartialSigType on all HsWildCardBndrs?</span></span>
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865
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865
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<pre style="margin: 0;"> <span id="LC865" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The solution then is to neither rename nor include unnamed wildcards in HsWildCardBndrs,</span></span>
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866
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<pre style="margin: 0;">-<span id="LC866" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">but instead give every anonymouswildcard a fresh wild tyvar in tcAnonWildCardOcc.</span></span>
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<pre style="margin: 0;">+<span id="LC866" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">but instead give every anonymous<span class="idiff left right"> </span>wildcard a fresh wild tyvar in tcAnonWildCardOcc.</span></span>
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867
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867
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<pre style="margin: 0;"> <span id="LC867" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">And whenever we see a '@', we automatically turn on PartialTypeSignatures and</span></span>
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868
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868
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<pre style="margin: 0;"> <span id="LC868" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">turn off hole constraint warnings, and do not call emitAnonWildCardHoleConstraint</span></span>
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869
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869
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<pre style="margin: 0;"> <span id="LC869" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">under these conditions.</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">@@ -1709,7 +1709,7 @@ To avoid the double-zonk, we do two things:</td>
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1709
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<pre style="margin: 0;"> <span id="LC1709" class="line" lang="haskell"><span class="n" style="color: #333;">tcNamedWildCardBinders</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>
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<pre style="margin: 0;"> <span id="LC1710" 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;">Name</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">)]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1711" 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="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">-<span id="LC1712" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Bring into scope the /named/ wildcard binders. Remember t<span class="idiff left right">ah</span>t</span></span>
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<pre style="margin: 0;">+<span id="LC1712" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Bring into scope the /named/ wildcard binders. Remember t<span class="idiff left right">ha</span>t</span></span>
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<pre style="margin: 0;"> <span id="LC1713" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- plain wildcards _ are anonymous and dealt with by HsWildCardTy</span></span>
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<pre style="margin: 0;"> <span id="LC1714" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Soe Note [The wildcard story for types] in HsTypes</span></span>
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<pre style="margin: 0;"> <span id="LC1715" class="line" lang="haskell"><span class="n" style="color: #333;">tcNamedWildCardBinders</span> <span class="n" style="color: #333;">wc_names</span> <span class="n" style="color: #333;">thing_inside</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">@@ -2477,8 +2477,8 @@ tcHsPartialSigType</td>
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<pre style="margin: 0;"> <span id="LC2477" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LHsSigWcType</span> <span class="kt" style="color: #458; font-weight: 600;">GhcRn</span> <span class="c1" style="color: #998; font-style: italic;">-- The type signature</span></span>
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<pre style="margin: 0;"> <span id="LC2478" 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="p">(</span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">)]</span> <span class="c1" style="color: #998; font-style: italic;">-- Wildcards</span></span>
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<pre style="margin: 0;"> <span id="LC2479" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="c1" style="color: #998; font-style: italic;">-- Extra-constraints wildcard</span></span>
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<pre style="margin: 0;">-<span id="LC2480" class="line" lang="haskell"> <span class="p">,</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Name</span></span><span class="p"><span class="idiff">]</span></span><span class="idiff"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- Original tyvar names, in correspondence with ...</span></span></span>
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<pre style="margin: 0;">-<span id="LC2481" class="line" lang="haskell"> <span class="p"><span class="idiff left">,</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">TcTyVar</span></span><span class="p"><span class="idiff">]</span></span><span class="idiff"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- ... I</span>mplicitly and explicitly bound type variables</span></span>
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<pre style="margin: 0;">+<span id="LC2480" class="line" lang="haskell"> <span class="p">,</span> <span class="p">[<span class="idiff left">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Name</span></span><span class="p"><span class="idiff">,</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">TcTyVar</span></span><span class="p"><span class="idiff">)]</span></span><span class="idiff"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- Original tyvar names, in correspondence with</span></span></span>
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<pre style="margin: 0;">+<span id="LC2481" class="line" lang="haskell"> <span class="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- the i</span>mplicitly and explicitly bound type variables</span></span>
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<pre style="margin: 0;"> <span id="LC2482" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcThetaType</span> <span class="c1" style="color: #998; font-style: italic;">-- Theta part</span></span>
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<pre style="margin: 0;"> <span id="LC2483" class="line" lang="haskell"> <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;">-- Tau part</span></span>
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<pre style="margin: 0;"> <span id="LC2484" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Checking partial type signatures]</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">@@ -2504,26 +2504,23 @@ tcHsPartialSigType ctxt sig_ty</td>
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<pre style="margin: 0;"> <span id="LC2504" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2505" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">wcs</span><span class="p">,</span> <span class="n" style="color: #333;">wcx</span><span class="p">,</span> <span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC2506" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2507" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We must return these separately, because all the zonking below</span></span>
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<pre style="margin: 0;">-<span id="LC2508" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- might change the name of a TyVarTv. This, in turn, causes trouble</span></span>
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<pre style="margin: 0;">-<span id="LC2509" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- in partial type signatures that bind scoped type variables, as</span></span>
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<pre style="margin: 0;">-<span id="LC2510" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we bring the wrong name into scope in the function body.</span></span>
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<pre style="margin: 0;">-<span id="LC2511" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Test case: partial-sigs/should_compile/LocalDefinitionBug</span></span>
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<pre style="margin: 0;">-<span id="LC2512" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">tv_names</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implicit_hs_tvs</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">hsLTyVarNames</span> <span class="n" style="color: #333;">explicit_hs_tvs</span></span>
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<pre style="margin: 0;">-<span id="LC2513" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2507" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Spit out the wildcards (including the extra-constraints one)</span></span>
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<pre style="margin: 0;"> <span id="LC2508" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- as "hole" constraints, so that they'll be reported if necessary</span></span>
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<pre style="margin: 0;"> <span id="LC2509" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Extra-constraint holes in partial type signatures]</span></span>
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<pre style="margin: 0;"> <span id="LC2510" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">emitNamedWildCardHoleConstraints</span> <span class="n" style="color: #333;">wcs</span></span>
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<pre style="margin: 0;"> <span id="LC2511" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2519" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">all_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">implicit_tvs</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">explicit_tvs</span></span>
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<pre style="margin: 0;">+<span id="LC2512" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We return a proper (Name,TyVar) environment, to be sure that</span></span>
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<pre style="margin: 0;">+<span id="LC2513" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we bring the right name into scope in the function body.</span></span>
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<pre style="margin: 0;">+<span id="LC2514" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Test case: partial-sigs/should_compile/LocalDefinitionBug</span></span>
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<pre style="margin: 0;">+<span id="LC2515" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">tv_prs</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="n" style="color: #333;">implicit_hs_tvs</span> <span class="p">`</span><span class="n" style="color: #333;">zip</span><span class="p">`</span> <span class="n" style="color: #333;">implicit_tvs</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2516" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">++</span> <span class="p">(</span><span class="n" style="color: #333;">hsLTyVarNames</span> <span class="n" style="color: #333;">explicit_hs_tvs</span> <span class="p">`</span><span class="n" style="color: #333;">zip</span><span class="p">`</span> <span class="n" style="color: #333;">explicit_tvs</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2517" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2518" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: checkValidType on the final inferred type will be</span></span>
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2522
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2519
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<pre style="margin: 0;"> <span id="LC2519" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- done later by checkInferredPolyId. We can't do it</span></span>
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2523
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2520
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<pre style="margin: 0;"> <span id="LC2520" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- here because we don't have a complete tuype to check</span></span>
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<pre style="margin: 0;"> <span id="LC2521" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2525" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tcHsPartialSigType"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;"><span class="idiff left right">all_tv</span>s</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC2526" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">wcs</span><span class="p">,</span> <span class="n" style="color: #333;">wcx</span><span class="p">,</span> <span class="n" style="color: #333;">tv_<span class="idiff left">names</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">all_tv</span>s</span><span class="p">,</span> <span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC2522" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"tcHsPartialSigType"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;"><span class="idiff left right">tv_pr</span>s</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC2523" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">wcs</span><span class="p">,</span> <span class="n" style="color: #333;">wcx</span><span class="p">,</span> <span class="n" style="color: #333;">tv_<span class="idiff left right">pr</span>s</span><span class="p">,</span> <span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span> <span class="p">}</span></span>
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2527
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<pre style="margin: 0;"> <span id="LC2524" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2525" class="line" lang="haskell"><span class="n" style="color: #333;">tcHsPartialSigType</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HsWC</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XHsImplicitBndrs</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"tcHsPartialSigType"</span></span>
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2529
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<pre style="margin: 0;"> <span id="LC2526" class="line" lang="haskell"><span class="n" style="color: #333;">tcHsPartialSigType</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">XHsWildCardBndrs</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"tcHsPartialSigType"</span></span>
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<li id="341aef35ac370771edf59ec6b9fbb31507fa6f18">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/598efac59cde44706761048aeb47e624da1f5b22#341aef35ac370771edf59ec6b9fbb31507fa6f18"><strong>compiler/typecheck/TcSigs.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">@@ -498,10 +498,9 @@ tcInstSig hs_sig@(PartialSig { psig_hs_ty = hs_ty</td>
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<pre style="margin: 0;"> <span id="LC498" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">sig_loc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">loc</span> <span class="p">})</span></span>
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<pre style="margin: 0;"> <span id="LC499" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">setSrcSpan</span> <span class="n" style="color: #333;">loc</span> <span class="o" style="font-weight: 600;">$</span> <span class="c1" style="color: #998; font-style: italic;">-- Set the binding site of the tyvars</span></span>
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<pre style="margin: 0;"> <span id="LC500" class="line" lang="haskell"> <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;">"Staring partial sig {"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">hs_sig</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC501" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">wcs</span><span class="p">,</span> <span class="n" style="color: #333;">wcx</span><span class="p">,</span> <span class="n" style="color: #333;">tv_<span class="idiff left">names</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">tv</span>s</span><span class="p">,</span> <span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcHsPartialSigType</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">hs_ty</span></span>
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<pre style="margin: 0;">+<span id="LC501" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">wcs</span><span class="p">,</span> <span class="n" style="color: #333;">wcx</span><span class="p">,</span> <span class="n" style="color: #333;">tv_<span class="idiff left right">pr</span>s</span><span class="p">,</span> <span class="n" style="color: #333;">theta</span><span class="p">,</span> <span class="n" style="color: #333;">tau</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcHsPartialSigType</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">hs_ty</span></span>
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<pre style="margin: 0;"> <span id="LC502" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Checking partial type signatures] in TcHsType</span></span>
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<pre style="margin: 0;">-<span id="LC503" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">tv_prs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tv_names</span> <span class="p">`</span><span class="n" style="color: #333;">zip</span><span class="p">`</span> <span class="n" style="color: #333;">tvs</span></span>
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<pre style="margin: 0;">-<span id="LC504" class="line" lang="haskell"> <span class="n" style="color: #333;">inst_sig</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TISI</span> <span class="p">{</span> <span class="n" style="color: #333;">sig_inst_sig</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_sig</span></span>
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<pre style="margin: 0;">+<span id="LC503" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">inst_sig</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">TISI</span> <span class="p">{</span> <span class="n" style="color: #333;">sig_inst_sig</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hs_sig</span></span>
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<pre style="margin: 0;"> <span id="LC504" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">sig_inst_skols</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tv_prs</span></span>
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<pre style="margin: 0;"> <span id="LC505" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">sig_inst_wcs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wcs</span></span>
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506
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<pre style="margin: 0;"> <span id="LC506" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">sig_inst_wcx</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wcx</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/598efac59cde44706761048aeb47e624da1f5b22#341fd962c5f2c9fcf8be3dbdaa9a14ee1538af07"><strong>compiler/typecheck/TcType.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">@@ -1794,8 +1794,8 @@ hasTyVarHead ty -- Haskell 98 allows predicates of form</td>
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<pre style="margin: 0;"> <span id="LC1794" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1795" class="line" lang="haskell"><span class="n" style="color: #333;">evVarPred</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">EvVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">PredType</span></span>
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<pre style="margin: 0;"> <span id="LC1796" class="line" lang="haskell"><span class="n" style="color: #333;">evVarPred</span> <span class="n" style="color: #333;">var</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">varType</span> <span class="n" style="color: #333;">var</span></span>
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<pre style="margin: 0;">-<span id="LC1797" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Historical note: I used to have an ASSER<span class="idiff left right">R</span>T here,</span></span>
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<pre style="margin: 0;">-<span id="LC1798" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- checking (isEvVarType (varType var). But with something like</span></span>
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<pre style="margin: 0;">+<span id="LC1797" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Historical note: I used to have an ASSERT here,</span></span>
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<pre style="margin: 0;">+<span id="LC1798" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- checking (isEvVarType (varType var)<span class="idiff left right">)</span>. But with something like</span></span>
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<pre style="margin: 0;"> <span id="LC1799" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- f :: c => _ -> _</span></span>
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<pre style="margin: 0;"> <span id="LC1800" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we end up with (c :: kappa), and (kappa ~ Constraint). Until</span></span>
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<pre style="margin: 0;"> <span id="LC1801" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we solve and zonk (which there is no particular reason to do for</span></span>
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