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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/84cc8394d075cea236faa0bcd9ef0a84de89ee8c">84cc8394</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-04-18T13:20:29-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add a missing zonk in tcHsPartialType
I omitted a vital zonk when refactoring tcHsPartialType in
commit 48fb3482f8cbc8a4b37161021e846105f980eed4
Author: Simon Peyton Jones <simonpj@microsoft.com>
Date: Wed Jun 5 08:55:17 2019 +0100
Fix typechecking of partial type signatures
This patch fixes it and adds commentary to explain why.
Fixes #18008
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<h4>4 changed files:</h4>
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<li class="file-stats">
<a href="#9355bef855426caf5f526925edf351b20f9a86c4">
compiler/GHC/Tc/Gen/HsType.hs
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<a href="#82f05d8af401750ee96408feb631581681a501eb">
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testsuite/tests/partial-sigs/should_compile/T18008.hs
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<li class="file-stats">
<a href="#8b2d3c7a8cc9e6429a7ecff50ba44d0dfa7ca844">
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testsuite/tests/partial-sigs/should_compile/T18008.stderr
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<li class="file-stats">
<a href="#638bf502d5c9ded68b185325d908464f7da3dcac">
testsuite/tests/partial-sigs/should_compile/all.T
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<h4>Changes:</h4>
<li id="9355bef855426caf5f526925edf351b20f9a86c4">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/84cc8394d075cea236faa0bcd9ef0a84de89ee8c#9355bef855426caf5f526925edf351b20f9a86c4"><strong>compiler/GHC/Tc/Gen/HsType.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="732" 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">@@ -732,6 +732,7 @@ tc_hs_type mode forall@(HsForAllTy { hst_fvf = fvf, hst_bndrs = hs_tvs</td>
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732
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732
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<pre style="margin: 0;"> <span id="LC732" class="line" lang="haskell"> <span class="n" style="color: #333;">m_telescope</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">sep</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">hs_tvs</span><span class="p">))</span></span>
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733
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733
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<pre style="margin: 0;"> <span id="LC733" class="line" lang="haskell"></span>
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734
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734
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<pre style="margin: 0;"> <span id="LC734" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">emitResidualTvConstraint</span> <span class="n" style="color: #333;">skol_info</span> <span class="n" style="color: #333;">m_telescope</span> <span class="n" style="color: #333;">tvs'</span> <span class="n" style="color: #333;">tclvl</span> <span class="n" style="color: #333;">wanted</span></span>
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735
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<pre style="margin: 0;">+<span id="LC735" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Skolem escape and forall-types]</span></span>
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735
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736
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<pre style="margin: 0;"> <span id="LC736" class="line" lang="haskell"></span>
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736
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737
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<pre style="margin: 0;"> <span id="LC737" 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;">mkForAllTys</span> <span class="n" style="color: #333;">bndrs</span> <span class="n" style="color: #333;">ty'</span><span class="p">)</span> <span class="p">}</span></span>
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737
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738
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<pre style="margin: 0;"> <span id="LC738" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="920" 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="921" 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">@@ -920,6 +921,26 @@ under these conditions.</td>
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920
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921
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<pre style="margin: 0;"> <span id="LC921" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See related Note [Wildcards in visible type application] here and</span></span>
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921
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922
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<pre style="margin: 0;"> <span id="LC922" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [The wildcard story for types] in GHC.Hs.Types</span></span>
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922
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923
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<pre style="margin: 0;"> <span id="LC923" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC924" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Skolem escape and forall-types]</span></span>
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<pre style="margin: 0;">+<span id="LC925" 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="LC926" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider</span></span>
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<pre style="margin: 0;">+<span id="LC927" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: forall a. (forall kb (b :: kb). Proxy '[a, b]) -> ()</span></span>
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<pre style="margin: 0;">+<span id="LC928" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC929" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The Proxy '[a,b] forces a and b to have the same kind. But a's</span></span>
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930
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<pre style="margin: 0;">+<span id="LC930" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">kind must be bound outside the 'forall a', and hence escapes.</span></span>
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931
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<pre style="margin: 0;">+<span id="LC931" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We discover this by building an implication constraint for</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;">each forall. So the inner implication constraint will look like</span></span>
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<pre style="margin: 0;">+<span id="LC933" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> forall kb (b::kb). kb ~ ka</span></span>
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<pre style="margin: 0;">+<span id="LC934" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">where ka is a's kind. We can't unify these two, /even/ if ka is</span></span>
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<pre style="margin: 0;">+<span id="LC935" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">unification variable, because it would be untouchable inside</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;">this inner implication.</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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<pre style="margin: 0;">+<span id="LC938" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">That's what the pushLevelAndCaptureConstraints, plus subsequent</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;">emitResidualTvConstraint is all about, when kind-checking</span></span>
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<pre style="margin: 0;">+<span id="LC940" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">HsForAllTy.</span></span>
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<pre style="margin: 0;">+<span id="LC941" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC942" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that we don't need to /simplify/ the constraints here</span></span>
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<pre style="margin: 0;">+<span id="LC943" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">because we aren't generalising. We just capture them.</span></span>
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<pre style="margin: 0;"> <span id="LC944" 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="LC945" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC946" 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">@@ -2819,10 +2840,13 @@ kindGeneralizeAll ty = do { traceTc "kindGeneralizeAll" empty</td>
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<pre style="margin: 0;"> <span id="LC2840" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">kindGeneralizeSome</span> <span class="p">(</span><span class="n" style="color: #333;">const</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">)</span> <span class="n" style="color: #333;">ty</span> <span class="p">}</span></span>
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2841
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<pre style="margin: 0;"> <span id="LC2841" class="line" lang="haskell"></span>
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2821
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<pre style="margin: 0;"> <span id="LC2842" class="line" lang="haskell"><span class="cd">-- | Specialized version of 'kindGeneralizeSome', but where no variables</span></span>
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2822
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<pre style="margin: 0;">-<span id="LC2822" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- can be generalized. Use this variant when it is unknowable whether metavariables</span></span>
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2823
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<pre style="margin: 0;">-<span id="LC2823" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- might later be constrained.</span></span>
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2824
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<pre style="margin: 0;">-<span id="LC2824" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Recipe for checking a signature] for why and where this</span></span>
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2825
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<pre style="margin: 0;">-<span id="LC2825" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- function is needed.</span></span>
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<pre style="margin: 0;">+<span id="LC2843" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- can be generalized, but perhaps some may neeed to be promoted.</span></span>
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<pre style="margin: 0;">+<span id="LC2844" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Use this variant when it is unknowable whether metavariables might</span></span>
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2845
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<pre style="margin: 0;">+<span id="LC2845" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- later be constrained.</span></span>
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2846
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<pre style="margin: 0;">+<span id="LC2846" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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2847
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<pre style="margin: 0;">+<span id="LC2847" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- To see why this promotion is needed, see</span></span>
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2848
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<pre style="margin: 0;">+<span id="LC2848" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note [Recipe for checking a signature], and especially</span></span>
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2849
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<pre style="margin: 0;">+<span id="LC2849" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note [Promotion in signatures].</span></span>
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2826
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2850
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<pre style="margin: 0;"> <span id="LC2850" class="line" lang="haskell"><span class="n" style="color: #333;">kindGeneralizeNone</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="c1" style="color: #998; font-style: italic;">-- needn't be zonked</span></span>
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2827
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2851
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<pre style="margin: 0;"> <span id="LC2851" 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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2828
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2852
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<pre style="margin: 0;"> <span id="LC2852" class="line" lang="haskell"><span class="n" style="color: #333;">kindGeneralizeNone</span> <span class="n" style="color: #333;">ty</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="3160" 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="3184" 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">@@ -3160,7 +3184,7 @@ tcHsPartialSigType ctxt sig_ty</td>
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3160
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3184
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<pre style="margin: 0;"> <span id="LC3184" class="line" lang="haskell"></span>
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3161
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3185
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<pre style="margin: 0;"> <span id="LC3185" 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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3162
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3186
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<pre style="margin: 0;"> <span id="LC3186" class="line" lang="haskell"></span>
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3163
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<pre style="margin: 0;">-<span id="LC3163" class="line" lang="haskell"> <span class="idiff left"> </span><span class="c1" style="color: #998; font-style: italic;"><span class="idiff right">-- No kind-generalization here:</span></span></span>
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3187
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<pre style="margin: 0;">+<span id="LC3187" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;"><span class="idiff left right">-- No kind-generalization here, but perhaps some promotion</span></span></span>
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3164
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3188
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<pre style="margin: 0;"> <span id="LC3188" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">kindGeneralizeNone</span> <span class="p">(</span><span class="n" style="color: #333;">mkSpecForAllTys</span> <span class="n" style="color: #333;">implicit_tvs</span> <span class="o" style="font-weight: 600;">$</span></span>
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3165
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3189
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<pre style="margin: 0;"> <span id="LC3189" class="line" lang="haskell"> <span class="n" style="color: #333;">mkSpecForAllTys</span> <span class="n" style="color: #333;">explicit_tvs</span> <span class="o" style="font-weight: 600;">$</span></span>
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3166
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3190
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<pre style="margin: 0;"> <span id="LC3190" class="line" lang="haskell"> <span class="n" style="color: #333;">mkPhiTy</span> <span class="n" style="color: #333;">theta</span> <span class="o" style="font-weight: 600;">$</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="3171" 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="3195" 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">@@ -3171,6 +3195,14 @@ tcHsPartialSigType ctxt sig_ty</td>
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3171
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3195
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<pre style="margin: 0;"> <span id="LC3195" 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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3172
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3196
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<pre style="margin: 0;"> <span id="LC3196" 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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3173
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3197
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<pre style="margin: 0;"> <span id="LC3197" class="line" lang="haskell"></span>
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3198
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<pre style="margin: 0;">+<span id="LC3198" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Zonk, so that any nested foralls can "see" their occurrences</span></span>
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3199
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<pre style="margin: 0;">+<span id="LC3199" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Checking partial type signatures], in</span></span>
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3200
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<pre style="margin: 0;">+<span id="LC3200" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the bullet on Nested foralls.</span></span>
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3201
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<pre style="margin: 0;">+<span id="LC3201" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">implicit_tvs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">zonkTcTyVarToTyVar</span> <span class="n" style="color: #333;">implicit_tvs</span></span>
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3202
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<pre style="margin: 0;">+<span id="LC3202" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">explicit_tvs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">zonkTcTyVarToTyVar</span> <span class="n" style="color: #333;">explicit_tvs</span></span>
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3203
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<pre style="margin: 0;">+<span id="LC3203" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">theta</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mapM</span> <span class="n" style="color: #333;">zonkTcType</span> <span class="n" style="color: #333;">theta</span></span>
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3204
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<pre style="margin: 0;">+<span id="LC3204" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tau</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">zonkTcType</span> <span class="n" style="color: #333;">tau</span></span>
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3205
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<pre style="margin: 0;">+<span id="LC3205" class="line" lang="haskell"></span>
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3174
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3206
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<pre style="margin: 0;"> <span id="LC3206" 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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3175
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3207
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<pre style="margin: 0;"> <span id="LC3207" 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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3176
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3208
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<pre style="margin: 0;"> <span id="LC3208" 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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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -3179,7 +3211,7 @@ tcHsPartialSigType ctxt sig_ty</td>
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3179
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3211
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<pre style="margin: 0;"> <span id="LC3211" class="line" lang="haskell"></span>
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3180
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<pre style="margin: 0;"> <span id="LC3212" 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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3181
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<pre style="margin: 0;"> <span id="LC3213" 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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3182
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<pre style="margin: 0;">-<span id="LC3182" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- here because we don't have a complete t<span class="idiff left right">u</span>ype to check</span></span>
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<pre style="margin: 0;">+<span id="LC3214" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- here because we don't have a complete type to check</span></span>
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3183
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3215
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<pre style="margin: 0;"> <span id="LC3215" class="line" lang="haskell"></span>
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3184
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<pre style="margin: 0;"> <span id="LC3216" 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;">tv_prs</span><span class="p">)</span></span>
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3185
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3217
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<pre style="margin: 0;"> <span id="LC3217" 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_prs</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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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="3230" 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">@@ -3198,12 +3230,31 @@ tcPartialContext hs_theta</td>
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3198
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3230
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<pre style="margin: 0;"> <span id="LC3230" class="line" lang="haskell"></span>
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3199
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3231
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<pre style="margin: 0;"> <span id="LC3231" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Checking partial type signatures]</span></span>
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3200
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3232
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<pre style="margin: 0;"> <span id="LC3232" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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3201
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<pre style="margin: 0;">-<span id="LC3201" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See also Note [Recipe for checking a signature]</span></span>
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<pre style="margin: 0;">+<span id="LC3233" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This Note is about tcHsPartialSigType. See also</span></span>
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<pre style="margin: 0;">+<span id="LC3234" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Recipe for checking a signature]</span></span>
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3235
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<pre style="margin: 0;"> <span id="LC3235" class="line" lang="haskell"></span>
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3203
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3236
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<pre style="margin: 0;"> <span id="LC3236" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">When we have a partial signature like</span></span>
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3204
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<pre style="margin: 0;">-<span id="LC3204" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f<span class="idiff left right">,g</span> :: forall a. a -> _</span></span>
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3237
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<pre style="margin: 0;">+<span id="LC3237" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: forall a. a -> _</span></span>
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3205
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3238
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<pre style="margin: 0;"> <span id="LC3238" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we do the following</span></span>
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3206
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3239
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<pre style="margin: 0;"> <span id="LC3239" class="line" lang="haskell"></span>
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3240
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<pre style="margin: 0;">+<span id="LC3240" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* tcHsPartialSigType does not make quantified type (forall a. blah)</span></span>
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3241
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<pre style="margin: 0;">+<span id="LC3241" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> and then instantiate it -- it makes no sense to instantiate a type</span></span>
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3242
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<pre style="margin: 0;">+<span id="LC3242" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> with wildcards in it. Rather, tcHsPartialSigType just returns the</span></span>
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3243
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<pre style="margin: 0;">+<span id="LC3243" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 'a' and the 'blah' separately.</span></span>
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3244
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<pre style="margin: 0;">+<span id="LC3244" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3245" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Nor, for the same reason, do we push a level in tcHsPartialSigType.</span></span>
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3246
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<pre style="margin: 0;">+<span id="LC3246" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3247" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* We instantiate 'a' to a unification variable, a TyVarTv, and /not/</span></span>
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<pre style="margin: 0;">+<span id="LC3248" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a skolem; hence the "_Tv" in bindExplicitTKBndrs_Tv. Consider</span></span>
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3249
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<pre style="margin: 0;">+<span id="LC3249" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: forall a. a -> _</span></span>
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3250
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<pre style="margin: 0;">+<span id="LC3250" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g :: forall b. _ -> b</span></span>
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3251
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<pre style="margin: 0;">+<span id="LC3251" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f = g</span></span>
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3252
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<pre style="margin: 0;">+<span id="LC3252" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g = f</span></span>
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3253
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<pre style="margin: 0;">+<span id="LC3253" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> They are typechecked as a recursive group, with monomorphic types,</span></span>
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3254
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<pre style="margin: 0;">+<span id="LC3254" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> so 'a' and 'b' will get unified together. Very like kind inference</span></span>
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3255
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<pre style="margin: 0;">+<span id="LC3255" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> for mutually recursive data types (sans CUSKs or SAKS); see</span></span>
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3256
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<pre style="margin: 0;">+<span id="LC3256" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Note [Cloning for tyvar binders] in GHC.Tc.Gen.HsType</span></span>
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3257
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<pre style="margin: 0;">+<span id="LC3257" class="line" lang="haskell"></span>
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3258
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<pre style="margin: 0;"> <span id="LC3258" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* In GHC.Tc.Gen.Sig.tcUserSigType we return a PartialSig, which (unlike</span></span>
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3208
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3259
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<pre style="margin: 0;"> <span id="LC3259" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the companion CompleteSig) contains the original, as-yet-unchecked</span></span>
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3209
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3260
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<pre style="margin: 0;"> <span id="LC3260" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> source-code LHsSigWcType</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">@@ -3218,12 +3269,28 @@ we do the following</td>
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3218
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3269
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<pre style="margin: 0;"> <span id="LC3269" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g x = True</span></span>
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3219
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3270
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<pre style="margin: 0;"> <span id="LC3270" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> It's really as if we'd written two distinct signatures.</span></span>
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3220
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3271
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<pre style="margin: 0;"> <span id="LC3271" class="line" lang="haskell"></span>
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3221
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<pre style="margin: 0;">-<span id="LC3221" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Note that we don't make quantified type (forall a. blah) and then</span></span>
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3222
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<pre style="margin: 0;">-<span id="LC3222" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instantiate it -- it makes no sense to instantiate a type with</span></span>
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3223
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<pre style="margin: 0;">-<span id="LC3223" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> wildcards in it. Rather, tcHsPartialSigType just returns the</span></span>
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3224
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<pre style="margin: 0;">-<span id="LC3224" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 'a' and the 'blah' separately.</span></span>
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3225
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<pre style="margin: 0;">-<span id="LC3225" class="line" lang="haskell"></span>
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3226
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<pre style="margin: 0;">-<span id="LC3226" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Nor, for the same reason, do we push a level in tcHsPartialSigType.</span></span>
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3272
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<pre style="margin: 0;">+<span id="LC3272" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Nested foralls. Consider</span></span>
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3273
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<pre style="margin: 0;">+<span id="LC3273" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f :: forall b. (forall a. a -> _) -> b</span></span>
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3274
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<pre style="margin: 0;">+<span id="LC3274" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We do /not/ allow the "_" to be instantiated to 'a'; but we do</span></span>
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3275
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<pre style="margin: 0;">+<span id="LC3275" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (as before) allow it to be instantiated to the (top level) 'b'.</span></span>
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3276
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<pre style="margin: 0;">+<span id="LC3276" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Why not? Because suppose</span></span>
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3277
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<pre style="margin: 0;">+<span id="LC3277" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f x = (x True, x 'c')</span></span>
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3278
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<pre style="margin: 0;">+<span id="LC3278" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We must instantiate that (forall a. a -> _) when typechecking</span></span>
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3279
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<pre style="margin: 0;">+<span id="LC3279" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> f's body, so we must know precisely where all the a's are; they</span></span>
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3280
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<pre style="margin: 0;">+<span id="LC3280" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> must not be hidden under (filled-in) unification variables!</span></span>
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3281
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<pre style="margin: 0;">+<span id="LC3281" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3282" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We achieve this in the usual way: we push a level at a forall,</span></span>
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<pre style="margin: 0;">+<span id="LC3283" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> so now the unification variable for the "_" can't unify with</span></span>
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3284
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<pre style="margin: 0;">+<span id="LC3284" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 'a'.</span></span>
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3285
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<pre style="margin: 0;">+<span id="LC3285" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3286" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Just as for ordinary signatures, we must zonk the type after</span></span>
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<pre style="margin: 0;">+<span id="LC3287" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> kind-checking it, to ensure that all the nested forall binders can</span></span>
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3288
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<pre style="margin: 0;">+<span id="LC3288" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> see their occurrenceds</span></span>
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<pre style="margin: 0;">+<span id="LC3289" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC3290" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Just as for ordinary signatures, this zonk also gets any Refl casts</span></span>
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<pre style="margin: 0;">+<span id="LC3291" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> out of the way of instantiation. Example: #18008 had</span></span>
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<pre style="margin: 0;">+<span id="LC3292" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> foo :: (forall a. (Show a => blah) |> Refl) -> _</span></span>
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<pre style="margin: 0;">+<span id="LC3293" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> and that Refl cast messed things up. See #18062.</span></span>
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<pre style="margin: 0;"> <span id="LC3294" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3295" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Extra-constraint holes in partial type signatures]</span></span>
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<pre style="margin: 0;"> <span id="LC3296" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/84cc8394d075cea236faa0bcd9ef0a84de89ee8c#82f05d8af401750ee96408feb631581681a501eb"><strong>testsuite/tests/partial-sigs/should_compile/T18008.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 RankNTypes #-}</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 PartialTypeSignatures #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">Bug</span> <span class="kr" style="font-weight: 600;">where</span></span>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>
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5
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</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;">Show</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=></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;">String</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">_</span></span>
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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">s</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">s</span> <span class="nb" style="color: #0086b3;">()</span></span>
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7
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/84cc8394d075cea236faa0bcd9ef0a84de89ee8c#8b2d3c7a8cc9e6429a7ecff50ba44d0dfa7ca844"><strong>testsuite/tests/partial-sigs/should_compile/T18008.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">T18008.hs:5:43: warning: [-Wpartial-type-signatures (in -Wdefault)]</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Found type wildcard ‘_’ standing for ‘String’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> • In the type ‘(forall a. Show a => a -> String) -> _’</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> In the type signature: f :: (forall a. Show a => a -> String) -> _</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/84cc8394d075cea236faa0bcd9ef0a84de89ee8c#638bf502d5c9ded68b185325d908464f7da3dcac"><strong>testsuite/tests/partial-sigs/should_compile/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">@@ -95,3 +95,4 @@ test('T16334', normal, compile, [''])</td>
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<pre style="margin: 0;"> <span id="LC95" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T16728</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="LC96" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T16728a</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="LC97" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T16728b</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="LC98" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18008</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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