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<h3>
Simon Peyton Jones pushed to branch wip/T18126
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7572a47e3c7cb3efc796799c4444abae53782ce2">7572a47e</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-09-14T15:30:36+01:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">wibbles ql
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9f5ec17529213e447e708622289f2c32bb6b0739">9f5ec175</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-09-14T15:31:00+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">wibbles generalisation patch
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<h4>5 changed files:</h4>
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<li class="file-stats">
<a href="#6a1f039ed7725eddef15dd5f4dc318a3434f26c9">
compiler/GHC/Tc/Gen/App.hs
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<li class="file-stats">
<a href="#54436e21ea530a66a8a71bcc01c836f4740b8f02">
compiler/GHC/Tc/Solver.hs
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<li class="file-stats">
<a href="#f018e77421f495c6f75733fee4a511cfe57bebe8">
compiler/GHC/Tc/Solver/Canonical.hs
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<li class="file-stats">
<a href="#74295edeac870ee7f2f3484ebaffab5c948b735a">
compiler/GHC/Tc/Utils/Unify.hs
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<li class="file-stats">
<a href="#b02c1c6109c60b8f685234b0dbaabf6c79fed2a2">
docs/users_guide/ghci.rst
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<h4>Changes:</h4>
<li id="6a1f039ed7725eddef15dd5f4dc318a3434f26c9">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/126c219a502d2565d4d381a70ee3f464bce73a94...9f5ec17529213e447e708622289f2c32bb6b0739#6a1f039ed7725eddef15dd5f4dc318a3434f26c9"><strong>compiler/GHC/Tc/Gen/App.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">@@ -33,6 +33,7 @@ import GHC.Core.TyCon</td>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCo.Rep</span></span>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCo.Ppr</span></span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCo.Subst</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">substTyWithInScope</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.TyCo.FVs</span><span class="p">(</span> <span class="n" style="color: #333;">shallowTyCoVarsOfType</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Core.Type</span></span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Tc.Types.Evidence</span></span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Var.Set</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="852" 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="853" 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">@@ -852,31 +853,69 @@ qlUnify delta ty1 ty2</td>
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<pre style="margin: 0;"> <span id="LC853" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">go_flexi</span> <span class="n" style="color: #333;">bvs</span> <span class="n" style="color: #333;">kappa</span> <span class="n" style="color: #333;">ty2</span> <span class="p">}</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC854" class="line" lang="haskell"></span>
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854
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<pre style="margin: 0;"> <span id="LC855" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">----------------</span></span>
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855
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<pre style="margin: 0;">-<span id="LC855" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ToDo: what about other magic in Unify.metaTyVarUpdateOK?</span></span>
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856
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<pre style="margin: 0;"> <span id="LC856" class="line" lang="haskell"> <span class="n" style="color: #333;">go_flexi</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span><span class="n" style="color: #333;">bvs2</span><span class="p">)</span> <span class="n" style="color: #333;">kappa</span> <span class="n" style="color: #333;">ty2</span> <span class="c1" style="color: #998; font-style: italic;">-- ty2 is zonked</span></span>
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<td class="diff-line-num old old_line" data-linenumber="857" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
857
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<pre style="margin: 0;">-<span id="LC857" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">ty2_tvs</span> <span class="p">`</span><span class="n" style="color: #333;">intersectsVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">bvs2</span> <span class="c1" style="color: #998; font-style: italic;">-- We really only need shallow here</span></span>
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<td class="diff-line-num old old_line" data-linenumber="858" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
858
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<pre style="margin: 0;">-<span id="LC858" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span> <span class="c1" style="color: #998; font-style: italic;">-- Can't instantiate a delta-var</span></span>
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859
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<pre style="margin: 0;">-<span id="LC859" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to a forall-bound variable</span></span>
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860
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<pre style="margin: 0;">-<span id="LC860" class="line" lang="haskell"></span>
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<td class="diff-line-num old old_line" data-linenumber="861" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
861
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<pre style="margin: 0;">-<span id="LC861" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">kappa</span> <span class="p">`</span><span class="n" style="color: #333;">elemVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">ty2_tvs</span></span>
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862
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<pre style="margin: 0;">-<span id="LC862" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span> <span class="c1" style="color: #998; font-style: italic;">-- Occurs-check</span></span>
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<pre style="margin: 0;">-<span id="LC863" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC864" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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865
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<pre style="margin: 0;">-<span id="LC865" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="c1" style="color: #998; font-style: italic;">-- Unify the kinds</span></span>
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866
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<pre style="margin: 0;">-<span id="LC866" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- c.f. Note [Equalities with incompatible kinds] in Solver.Canonical</span></span>
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867
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<pre style="margin: 0;">-<span id="LC867" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unifyKind</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty2</span><span class="p">))</span> <span class="n" style="color: #333;">ty2_kind</span> <span class="n" style="color: #333;">kappa_kind</span></span>
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857
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<pre style="margin: 0;">+<span id="LC857" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Actual unification in qlUnify]</span></span>
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858
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<pre style="margin: 0;">+<span id="LC858" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">ty2_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">shallowTyCoVarsOfType</span> <span class="n" style="color: #333;">ty2</span></span>
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859
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<pre style="margin: 0;">+<span id="LC859" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">ty2_tvs</span> <span class="p">`</span><span class="n" style="color: #333;">intersectsVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">bvs2</span><span class="p">)</span></span>
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860
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<pre style="margin: 0;">+<span id="LC860" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Can't instantiate a delta-varto a forall-bound variable</span></span>
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861
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<pre style="margin: 0;">+<span id="LC861" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">ty2'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">occCheckExpand</span> <span class="p">[</span><span class="n" style="color: #333;">kappa</span><span class="p">]</span> <span class="n" style="color: #333;">ty2</span></span>
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862
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<pre style="margin: 0;">+<span id="LC862" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Passes the occurs check</span></span>
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863
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<pre style="margin: 0;">+<span id="LC863" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unifyKind</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty2</span><span class="p">))</span> <span class="n" style="color: #333;">ty2_kind</span> <span class="n" style="color: #333;">kappa_kind</span></span>
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<pre style="margin: 0;">+<span id="LC864" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- unifyKind: see Note [Actual unification in qlUnify]</span></span>
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865
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<pre style="margin: 0;"> <span id="LC865" class="line" lang="haskell"></span>
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869
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866
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<pre style="margin: 0;"> <span id="LC866" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"qlUnify:update"</span> <span class="o" style="font-weight: 600;">$</span></span>
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870
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867
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<pre style="margin: 0;"> <span id="LC867" class="line" lang="haskell"> <span class="n" style="color: #333;">vcat</span> <span class="p">[</span> <span class="n" style="color: #333;">hang</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">kappa</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">kappa_kind</span><span class="p">)</span></span>
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871
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868
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<pre style="margin: 0;"> <span id="LC868" class="line" lang="haskell"> <span class="mi" style="color: #099;">2</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">":="</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty2</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">dcolon</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">ty2_kind</span><span class="p">)</span></span>
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872
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869
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<pre style="margin: 0;"> <span id="LC869" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"co:"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">co</span> <span class="p">]</span></span>
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873
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870
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<pre style="margin: 0;"> <span id="LC870" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">writeMetaTyVar</span> <span class="n" style="color: #333;">kappa</span> <span class="p">(</span><span class="n" style="color: #333;">mkCastTy</span> <span class="n" style="color: #333;">ty2</span> <span class="n" style="color: #333;">co</span><span class="p">)</span> <span class="p">}</span></span>
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871
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<pre style="margin: 0;">+<span id="LC871" class="line" lang="haskell"></span>
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872
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<pre style="margin: 0;">+<span id="LC872" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<pre style="margin: 0;">+<span id="LC873" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span> <span class="c1" style="color: #998; font-style: italic;">-- Occurs-check or forall-bound varialbe</span></span>
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<pre style="margin: 0;"> <span id="LC874" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC875" class="line" lang="haskell"> <span class="n" style="color: #333;">ty2_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyCoVarsOfType</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;"> <span id="LC875" class="line" lang="haskell"> <span class="n" style="color: #333;">ty2_kind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">typeKind</span> <span class="n" style="color: #333;">ty2</span></span>
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<pre style="margin: 0;"> <span id="LC876" class="line" lang="haskell"> <span class="n" style="color: #333;">kappa_kind</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyVarKind</span> <span class="n" style="color: #333;">kappa</span></span>
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<pre style="margin: 0;"> <span id="LC877" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC878" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC879" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [Actual unification in qlUnify]</span></span>
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<pre style="margin: 0;">+<span id="LC880" 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="LC881" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In qlUnify, if we find (kappa ~ ty), we are going to update kappa := ty.</span></span>
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<pre style="margin: 0;">+<span id="LC882" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">That is the entire point of qlUnify! Wrinkles</span></span>
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<pre style="margin: 0;">+<span id="LC883" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC884" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* We must not unify with anything bound by an enclosing forall; e.g.</span></span>
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<pre style="margin: 0;">+<span id="LC885" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (forall a. kappa -> Int) ~ forall a. a -> Int)</span></span>
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<pre style="margin: 0;">+<span id="LC886" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> That's tracked by the 'bvs' arg of 'go'.</span></span>
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<pre style="margin: 0;">+<span id="LC887" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC888" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* We must not make an occurs-check; we use occCheckExpand for that.</span></span>
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<pre style="margin: 0;">+<span id="LC889" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC890" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* metaTyVarUpdateOK also checks for various other things, including</span></span>
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<pre style="margin: 0;">+<span id="LC891" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - foralls, and predicate types, which we want to allow here</span></span>
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<pre style="margin: 0;">+<span id="LC892" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - blocking coercion holes</span></span>
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<pre style="margin: 0;">+<span id="LC893" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - type families</span></span>
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<pre style="margin: 0;">+<span id="LC894" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> But after some thought we believe that none of these are relevant</span></span>
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<pre style="margin: 0;">+<span id="LC895" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> here.</span></span>
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896
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<pre style="margin: 0;">+<span id="LC896" class="line" lang="haskell"></span>
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897
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<pre style="margin: 0;">+<span id="LC897" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* What if kappa and ty have different kinds? We solve that problem by</span></span>
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898
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<pre style="margin: 0;">+<span id="LC898" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> calling unifyKind, producing a coercion perhaps emitting some deferred</span></span>
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899
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<pre style="margin: 0;">+<span id="LC899" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> equality constraints. That is /different/ from the approach we use in</span></span>
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900
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<pre style="margin: 0;">+<span id="LC900" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the main constraint solver for herterogeneous equalities; see Note</span></span>
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901
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<pre style="margin: 0;">+<span id="LC901" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [Equalities with incompatible kinds] in Solver.Canonical</span></span>
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902
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<pre style="margin: 0;">+<span id="LC902" class="line" lang="haskell"></span>
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903
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<pre style="margin: 0;">+<span id="LC903" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Why different? Because:</span></span>
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904
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<pre style="margin: 0;">+<span id="LC904" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - We can't use qlUnify to solve the kind constraint because qlUnify</span></span>
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905
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<pre style="margin: 0;">+<span id="LC905" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> won't unify ordinary (non-instantiation) unification variables.</span></span>
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906
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<pre style="margin: 0;">+<span id="LC906" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (It would have to worry about lots of things like untouchability</span></span>
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907
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<pre style="margin: 0;">+<span id="LC907" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> if it did.)</span></span>
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908
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<pre style="margin: 0;">+<span id="LC908" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - qlUnify can't give up if the kinds look un-equal because that would</span></span>
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909
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<pre style="margin: 0;">+<span id="LC909" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> mean that it might succeed some times (when the eager unifier</span></span>
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910
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<pre style="margin: 0;">+<span id="LC910" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> has already unified those kinds) but not others -- order</span></span>
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911
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<pre style="margin: 0;">+<span id="LC911" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> dependence.</span></span>
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912
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<pre style="margin: 0;">+<span id="LC912" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> - We can't use the ordinary unifier/constraint solver instead,</span></span>
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913
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<pre style="margin: 0;">+<span id="LC913" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> because it doesn't unify polykinds, and has all kinds of other</span></span>
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914
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<pre style="margin: 0;">+<span id="LC914" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> magic. qlUnify is very focused.</span></span>
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915
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<pre style="margin: 0;">+<span id="LC915" class="line" lang="haskell"></span>
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916
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<pre style="margin: 0;">+<span id="LC916" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> TL;DR Calling unifyKind seems like the lesser evil.</span></span>
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917
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<pre style="margin: 0;">+<span id="LC917" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -}</span></span>
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918
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<pre style="margin: 0;">+<span id="LC918" class="line" lang="haskell"></span>
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880
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919
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<pre style="margin: 0;"> <span id="LC919" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *********************************************************************</span></span>
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881
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920
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<pre style="margin: 0;"> <span id="LC920" 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="LC921" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Guardedness</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/126c219a502d2565d4d381a70ee3f464bce73a94...9f5ec17529213e447e708622289f2c32bb6b0739#54436e21ea530a66a8a71bcc01c836f4740b8f02"><strong>compiler/GHC/Tc/Solver.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">@@ -161,6 +161,9 @@ pushLevelAndSolveEqualities :: SkolemInfo -> [TcTyVar] -> TcM a -> TcM a</td>
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<pre style="margin: 0;"> <span id="LC161" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Push level, and solve all resulting equalities</span></span>
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162
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162
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<pre style="margin: 0;"> <span id="LC162" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If there are any unsolved equalities, report them</span></span>
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163
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163
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<pre style="margin: 0;"> <span id="LC163" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- and fail (in the monad)</span></span>
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<pre style="margin: 0;">+<span id="LC164" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC165" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Panics if we solve any non-equality constraints. (In runTCSEqualities</span></span>
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<pre style="margin: 0;">+<span id="LC166" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- we use an error thunk for the evidence bindings.)</span></span>
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167
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<pre style="margin: 0;"> <span id="LC167" class="line" lang="haskell"><span class="n" style="color: #333;">pushLevelAndSolveEqualities</span> <span class="n" style="color: #333;">skol_info</span> <span class="n" style="color: #333;">skol_tvs</span> <span class="n" style="color: #333;">thing_inside</span></span>
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<pre style="margin: 0;"> <span id="LC168" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">tclvl</span><span class="p">,</span> <span class="n" style="color: #333;">wanted</span><span class="p">,</span> <span class="n" style="color: #333;">res</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pushLevelAndSolveEqualitiesX</span></span>
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169
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<pre style="margin: 0;"> <span id="LC169" class="line" lang="haskell"> <span class="s" style="color: #d14;">"pushLevelAndSolveEqualities"</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">@@ -172,6 +175,9 @@ pushLevelAndSolveEqualitiesX :: String -> TcM a</td>
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172
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<pre style="margin: 0;"> <span id="LC175" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Push the level, gather equality constraints, and then solve them.</span></span>
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173
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<pre style="margin: 0;"> <span id="LC176" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Returns any remaining unsolved equalities.</span></span>
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<pre style="margin: 0;"> <span id="LC177" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Does not report errors.</span></span>
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<pre style="margin: 0;">+<span id="LC178" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC179" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Panics if we solve any non-equality constraints. (In runTCSEqualities</span></span>
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<pre style="margin: 0;">+<span id="LC180" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- we use an error thunk for the evidence bindings.)</span></span>
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<pre style="margin: 0;"> <span id="LC181" class="line" lang="haskell"><span class="n" style="color: #333;">pushLevelAndSolveEqualitiesX</span> <span class="n" style="color: #333;">callsite</span> <span class="n" style="color: #333;">thing_inside</span></span>
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<pre style="margin: 0;"> <span id="LC182" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"pushLevelAndSolveEqualitiesX {"</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Called from"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="n" style="color: #333;">callsite</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC183" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">tclvl</span><span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">wanted</span><span class="p">,</span> <span class="n" style="color: #333;">res</span><span class="p">))</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -187,6 +193,9 @@ pushLevelAndSolveEqualitiesX callsite thing_inside</td>
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<pre style="margin: 0;"> <span id="LC193" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- constraints we can and re-emitting constraints that we can't.</span></span>
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<pre style="margin: 0;"> <span id="LC194" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Use this variant only when we'll get another crack at it later</span></span>
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<pre style="margin: 0;"> <span id="LC195" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Failure in local type signatures]</span></span>
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<pre style="margin: 0;">+<span id="LC196" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC197" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Panics if we solve any non-equality constraints. (In runTCSEqualities</span></span>
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<pre style="margin: 0;">+<span id="LC198" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- we use an error thunk for the evidence bindings.)</span></span>
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<pre style="margin: 0;"> <span id="LC199" class="line" lang="haskell"><span class="n" style="color: #333;">solveEqualities</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">String</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="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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191
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<pre style="margin: 0;"> <span id="LC200" class="line" lang="haskell"><span class="n" style="color: #333;">solveEqualities</span> <span class="n" style="color: #333;">callsite</span> <span class="n" style="color: #333;">thing_inside</span></span>
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192
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201
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<pre style="margin: 0;"> <span id="LC201" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">traceTc</span> <span class="s" style="color: #d14;">"solveEqualities {"</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Called from"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">text</span> <span class="n" style="color: #333;">callsite</span><span class="p">)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/126c219a502d2565d4d381a70ee3f464bce73a94...9f5ec17529213e447e708622289f2c32bb6b0739#f018e77421f495c6f75733fee4a511cfe57bebe8"><strong>compiler/GHC/Tc/Solver/Canonical.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">@@ -2144,7 +2144,7 @@ k2 and use this to cast. To wit, from</td>
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<pre style="margin: 0;"> <span id="LC2144" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2145" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [X] (tv :: k1) ~ (rhs :: k2)</span></span>
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<pre style="margin: 0;"> <span id="LC2146" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC2147" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we go to</span></span>
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<pre style="margin: 0;">+<span id="LC2147" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right">(where [X] is [G], [W], or [D]), </span>we go to</span></span>
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<pre style="margin: 0;"> <span id="LC2148" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2149" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [noDerived X] co :: k2 ~ k1</span></span>
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<pre style="margin: 0;"> <span id="LC2150" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [X] (tv :: k1) ~ ((rhs |> co) :: k1)</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">@@ -2154,6 +2154,9 @@ where</td>
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<pre style="margin: 0;"> <span id="LC2154" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> noDerived G = G</span></span>
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<pre style="margin: 0;"> <span id="LC2155" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> noDerived _ = W</span></span>
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<pre style="margin: 0;"> <span id="LC2156" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2157" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For Wanted/Derived, the [X] constraint is "blocked" (not CTyEqCan, is CIrred)</span></span>
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<pre style="margin: 0;">+<span id="LC2158" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">until the k1~k2 constraint solved: Wrinkle (2).</span></span>
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<pre style="margin: 0;">+<span id="LC2159" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2160" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Wrinkles:</span></span>
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<pre style="margin: 0;"> <span id="LC2161" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2162" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (1) The noDerived step is because Derived equalities have no evidence.</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">@@ -2166,7 +2169,7 @@ Wrinkles:</td>
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<pre style="margin: 0;"> <span id="LC2169" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] (tv :: k1) ~ ((rhs |> co) :: k1)</span></span>
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<pre style="margin: 0;"> <span id="LC2170" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> as canonical in the inert set. In particular, we must not unify tv.</span></span>
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<pre style="margin: 0;"> <span id="LC2171" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> If we did, the Wanted becomes a Given (effectively), and then can</span></span>
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<pre style="margin: 0;">-<span id="LC2169" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> rewrite other Wanteds. But that's bad: See Note [Wanteds <span class="idiff left right">t</span>o not rewrite Wanteds]</span></span>
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<pre style="margin: 0;">+<span id="LC2172" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> rewrite other Wanteds. But that's bad: See Note [Wanteds <span class="idiff left right">d</span>o not rewrite Wanteds]</span></span>
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<pre style="margin: 0;"> <span id="LC2173" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> in GHC.Tc.Types.Constraint. The problem is about poor error messages. See #11198 for</span></span>
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<pre style="margin: 0;"> <span id="LC2174" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> tales of destruction.</span></span>
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<pre style="margin: 0;"> <span id="LC2175" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/126c219a502d2565d4d381a70ee3f464bce73a94...9f5ec17529213e447e708622289f2c32bb6b0739#74295edeac870ee7f2f3484ebaffab5c948b735a"><strong>compiler/GHC/Tc/Utils/Unify.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">@@ -14,7 +14,7 @@</td>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.Tc.Utils.Unify</span> <span class="p">(</span></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Full-blown subsumption</span></span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcWrapResult</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcWrapResultO</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcWrapResultMono</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC17" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcSkolemise</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcSkolemiseScoped</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcSkolemise<span class="idiff left">Always</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">tcSkolemise</span>ET</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcSkolemise</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcSkolemiseScoped</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcSkolemiseET</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcSubType</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcSubTypeSigma</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcSubTypePat</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcSubMult</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">checkConstraints</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">checkTvConstraints</span><span class="p">,</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -93,6 +93,9 @@ matchActualFunTySigma</td>
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<pre style="margin: 0;"> <span id="LC93" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Both are used only for error messages)</span></span>
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<pre style="margin: 0;"> <span id="LC94" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcRhoType</span> <span class="c1" style="color: #998; font-style: italic;">-- Type to analyse: a TcRhoType</span></span>
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<pre style="margin: 0;"> <span id="LC95" 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="kt" style="color: #458; font-weight: 600;">HsWrapper</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Scaled</span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC96" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The /argument/ is a RhoType</span></span>
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<pre style="margin: 0;">+<span id="LC97" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The /result/ is an (uninstantiated) SigmaType</span></span>
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<pre style="margin: 0;">+<span id="LC98" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;"> <span id="LC99" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [matchActualFunTy error handling] for the first three arguments</span></span>
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<pre style="margin: 0;"> <span id="LC100" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC101" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- If (wrap, arg_ty, res_ty) = matchActualFunTySigma ... fun_ty</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">@@ -826,10 +829,11 @@ to checkConstraints.</td>
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<pre style="margin: 0;"> <span id="LC829" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC830" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">tcSkolemiseScoped is very similar, but differs in two ways:</span></span>
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<pre style="margin: 0;"> <span id="LC831" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC829" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* It deals specially with just the outer forall, bringing those</span></span>
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<pre style="margin: 0;">-<span id="LC830" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type variables into lexical scope. To my surprise, I found that</span></span>
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<pre style="margin: 0;">-<span id="LC831" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> doing this regardless (in tcSkolemise) caused a non-trivial (1%-ish)</span></span>
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<pre style="margin: 0;">-<span id="LC832" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> perf hit on the compiler.</span></span>
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<pre style="margin: 0;">+<span id="LC832" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* It deals specially with just the outer forall, bringing those type</span></span>
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<pre style="margin: 0;">+<span id="LC833" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> variables into lexical scope. To my surprise, I found that doing</span></span>
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<pre style="margin: 0;">+<span id="LC834" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> this unconditionally in tcSkolemise (i.e. doing it even if we don't</span></span>
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<pre style="margin: 0;">+<span id="LC835" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> need to bring the variables into lexical scope, which is harmless)</span></span>
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<pre style="margin: 0;">+<span id="LC836" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> caused a non-trivial (1%-ish) perf hit on the compiler.</span></span>
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<pre style="margin: 0;"> <span id="LC837" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC838" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* It always calls checkConstraints, even if there are no skolem</span></span>
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<pre style="margin: 0;"> <span id="LC839" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> variables at all. Reason: there might be nested deferred errors</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">@@ -837,11 +841,13 @@ tcSkolemiseScoped is very similar, but differs in two ways:</td>
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841
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<pre style="margin: 0;"> <span id="LC841" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> See Note [When to build an implication] below.</span></span>
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842
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<pre style="margin: 0;"> <span id="LC842" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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843
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<pre style="margin: 0;"> <span id="LC843" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC840" class="line" lang="haskell"><span class="n" style="color: #333;">tcSkolemise</span><span class="p">,</span> <span class="n" style="color: #333;">tcSkolemiseScoped</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">tcSkolemiseAlways</span></span></span>
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<pre style="margin: 0;">+<span id="LC844" class="line" lang="haskell"><span class="n" style="color: #333;">tcSkolemise</span><span class="p">,</span> <span class="n" style="color: #333;">tcSkolemiseScoped</span></span>
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845
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<pre style="margin: 0;"> <span id="LC845" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">UserTypeCtxt</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcSigmaType</span></span>
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<pre style="margin: 0;"> <span id="LC846" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="n" style="color: #333;">result</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC847" 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="kt" style="color: #458; font-weight: 600;">HsWrapper</span><span class="p">,</span> <span class="n" style="color: #333;">result</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC848" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ The wrapper has type: spec_ty ~> expected_ty</span></span>
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<pre style="margin: 0;">+<span id="LC849" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Skolemisation] for the differences between</span></span>
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<pre style="margin: 0;">+<span id="LC850" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- tcSkolemiseScoped and tcSkolemise</span></span>
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<pre style="margin: 0;"> <span id="LC851" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC852" class="line" lang="haskell"><span class="n" style="color: #333;">tcSkolemiseScoped</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">expected_ty</span> <span class="n" style="color: #333;">thing_inside</span></span>
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<pre style="margin: 0;"> <span id="LC853" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">wrap</span><span class="p">,</span> <span class="n" style="color: #333;">tv_prs</span><span class="p">,</span> <span class="n" style="color: #333;">given</span><span class="p">,</span> <span class="n" style="color: #333;">rho_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">topSkolemise</span> <span class="n" style="color: #333;">expected_ty</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">@@ -860,9 +866,6 @@ tcSkolemise ctxt expected_ty thing_inside</td>
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<pre style="margin: 0;"> <span id="LC866" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">res</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">thing_inside</span> <span class="n" style="color: #333;">expected_ty</span></span>
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<pre style="margin: 0;"> <span id="LC867" 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;">idHsWrapper</span><span class="p">,</span> <span class="n" style="color: #333;">res</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC868" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<pre style="margin: 0;">-<span id="LC863" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcSkolemiseAlways</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">expected_ty</span> <span class="n" style="color: #333;">thing_inside</span></span>
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<pre style="margin: 0;">-<span id="LC864" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC865" class="line" lang="haskell"><span class="n" style="color: #333;">tcSkolemiseAlways</span> <span class="n" style="color: #333;">ctxt</span> <span class="n" style="color: #333;">expected_ty</span> <span class="n" style="color: #333;">thing_inside</span></span>
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866
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869
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<pre style="margin: 0;"> <span id="LC869" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">wrap</span><span class="p">,</span> <span class="n" style="color: #333;">tv_prs</span><span class="p">,</span> <span class="n" style="color: #333;">given</span><span class="p">,</span> <span class="n" style="color: #333;">rho_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">topSkolemise</span> <span class="n" style="color: #333;">expected_ty</span></span>
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867
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870
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<pre style="margin: 0;"> <span id="LC870" class="line" lang="haskell"></span>
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868
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871
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<pre style="margin: 0;"> <span id="LC871" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">skol_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">snd</span> <span class="n" style="color: #333;">tv_prs</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1949" 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">@@ -1946,7 +1949,7 @@ occCheckForErrors :: DynFlags -> TcTyVar -> Type -> MetaTyVarUpdateResult ()</td>
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1946
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1949
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<pre style="margin: 0;"> <span id="LC1949" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- a) the given variable occurs in the given type.</span></span>
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1947
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1950
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<pre style="margin: 0;"> <span id="LC1950" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- b) there is a forall in the type (unless we have -XImpredicativeTypes)</span></span>
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1948
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1951
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<pre style="margin: 0;"> <span id="LC1951" class="line" lang="haskell"><span class="n" style="color: #333;">occCheckForErrors</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">ty</span></span>
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1949
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<pre style="margin: 0;">-<span id="LC1949" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;"><span class="idiff left right">preC</span>heck</span> <span class="n" style="color: #333;">dflags</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">ty</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1952
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<pre style="margin: 0;">+<span id="LC1952" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;"><span class="idiff left right">mtvu_c</span>heck</span> <span class="n" style="color: #333;">dflags</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">ty</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1950
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1953
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<pre style="margin: 0;"> <span id="LC1953" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MTVU_OK</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MTVU_OK</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1951
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1954
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<pre style="margin: 0;"> <span id="LC1954" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MTVU_Bad</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MTVU_Bad</span></span>
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1952
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1955
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<pre style="margin: 0;"> <span id="LC1955" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MTVU_HoleBlocker</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MTVU_HoleBlocker</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1960" 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="1963" 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">@@ -1960,13 +1963,20 @@ metaTyVarUpdateOK :: DynFlags</td>
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1960
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1963
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<pre style="margin: 0;"> <span id="LC1963" class="line" lang="haskell"> <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;">-- ty :: k2</span></span>
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1961
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1964
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<pre style="margin: 0;"> <span id="LC1964" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MetaTyVarUpdateResult</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="c1" style="color: #998; font-style: italic;">-- possibly-expanded ty</span></span>
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1962
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1965
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<pre style="margin: 0;"> <span id="LC1965" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (metaTyVarUpdateOK tv ty)</span></span>
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1963
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<pre style="margin: 0;">-<span id="LC1963" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We are about to update the meta-tyvar tv with ty</span></span>
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1964
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<pre style="margin: 0;">-<span id="LC1964" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Check (a) that tv doesn't occur in ty (occurs check)</span></span>
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1966
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<pre style="margin: 0;">+<span id="LC1966" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Checks that the equality tv~ty is OK to be used to rewrite</span></span>
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1967
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<pre style="margin: 0;">+<span id="LC1967" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- other equalities. Equivalently, checks the conditions for CTyEqCan</span></span>
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1968
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<pre style="margin: 0;">+<span id="LC1968" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (a) that tv doesn't occur in ty (occurs check)</span></span>
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1965
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1969
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<pre style="margin: 0;"> <span id="LC1969" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (b) that ty does not have any foralls</span></span>
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1966
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1970
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<pre style="margin: 0;"> <span id="LC1970" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (in the impredicative case), or type functions</span></span>
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1967
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1971
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<pre style="margin: 0;"> <span id="LC1971" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (c) that ty does not have any blocking coercion holes</span></span>
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1968
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1972
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<pre style="margin: 0;"> <span id="LC1972" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Equalities with incompatible kinds] in "GHC.Tc.Solver.Canonical"</span></span>
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1969
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1973
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<pre style="margin: 0;"> <span id="LC1973" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1974" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1974
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<pre style="margin: 0;">+<span id="LC1974" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Used in two places:</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1975" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1975
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<pre style="margin: 0;">+<span id="LC1975" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- - In the eager unifier: uUnfilledVar2</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1976" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1976
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<pre style="margin: 0;">+<span id="LC1976" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- - In the canonicaliser: GHC.Tc.Solver.Canonical.canEqTyVar2</span></span>
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<td class="diff-line-num new new_line" data-linenumber="1977" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1977
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<pre style="margin: 0;">+<span id="LC1977" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note that in the latter case tv is not necessarily a meta-tyvar,</span></span>
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1978
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<pre style="margin: 0;">+<span id="LC1978" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- despite the name of this function.</span></span>
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1979
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<pre style="margin: 0;">+<span id="LC1979" class="line" lang="haskell"></span>
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1970
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1980
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<pre style="margin: 0;"> <span id="LC1980" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We have two possible outcomes:</span></span>
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1971
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1981
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<pre style="margin: 0;"> <span id="LC1981" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (1) Return the type to update the type variable with,</span></span>
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1972
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<td class="diff-line-num new_line" data-linenumber="1982" 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">
1982
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<pre style="margin: 0;"> <span id="LC1982" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- [we know the update is ok]</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1985" 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="1995" 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">@@ -1985,7 +1995,7 @@ metaTyVarUpdateOK :: DynFlags</td>
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1985
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<td class="diff-line-num new_line" data-linenumber="1995" 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">
1995
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<pre style="margin: 0;"> <span id="LC1995" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [Refactoring hazard: checkTauTvUpdate]</span></span>
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<td class="diff-line-num old_line" data-linenumber="1986" 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">
1986
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<td class="diff-line-num new_line" data-linenumber="1996" 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">
1996
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<pre style="margin: 0;"> <span id="LC1996" class="line" lang="haskell"></span>
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<td class="diff-line-num old_line" data-linenumber="1987" 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">
1987
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1997
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<pre style="margin: 0;"> <span id="LC1997" class="line" lang="haskell"><span class="n" style="color: #333;">metaTyVarUpdateOK</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">ty</span></span>
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<td class="diff-line-num old old_line" data-linenumber="1988" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1988
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<pre style="margin: 0;">-<span id="LC1988" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;"><span class="idiff left right">preC</span>heck</span> <span class="n" style="color: #333;">dflags</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">ty</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<td class="diff-line-num new old_line" data-linenumber="1989" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="1998" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
1998
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<pre style="margin: 0;">+<span id="LC1998" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;"><span class="idiff left right">mtvu_c</span>heck</span> <span class="n" style="color: #333;">dflags</span> <span class="kt" style="color: #458; font-weight: 600;">False</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">ty</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<td class="diff-line-num old_line" data-linenumber="1989" 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">
1989
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<td class="diff-line-num new_line" data-linenumber="1999" 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">
1999
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<pre style="margin: 0;"> <span id="LC1999" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- False <=> type families not ok</span></span>
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<td class="diff-line-num old_line" data-linenumber="1990" 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">
1990
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2000
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<pre style="margin: 0;"> <span id="LC2000" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Prevent unification with type families]</span></span>
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<td class="diff-line-num old_line" data-linenumber="1991" 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">
1991
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<td class="diff-line-num new_line" data-linenumber="2001" 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">
2001
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<pre style="margin: 0;"> <span id="LC2001" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MTVU_OK</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MTVU_OK</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="1995" 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="2005" 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">@@ -1995,8 +2005,8 @@ metaTyVarUpdateOK dflags tv ty</td>
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1995
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2005
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<pre style="margin: 0;"> <span id="LC2005" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">expanded_ty</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MTVU_OK</span> <span class="n" style="color: #333;">expanded_ty</span></span>
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1996
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2006
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<pre style="margin: 0;"> <span id="LC2006" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MTVU_Occurs</span></span>
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1997
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2007
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<pre style="margin: 0;"> <span id="LC2007" class="line" lang="haskell"></span>
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<td class="diff-line-num old old_line" data-linenumber="1998" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
1998
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<pre style="margin: 0;">-<span id="LC1998" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left right">preC</span>heck</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MetaTyVarUpdateResult</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1999
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<pre style="margin: 0;">-<span id="LC1999" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">A quick check for</span></span></span>
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2008
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<pre style="margin: 0;">+<span id="LC2008" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left right">mtvu_c</span>heck</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MetaTyVarUpdateResult</span> <span class="nb" style="color: #0086b3;">()</span></span>
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2009
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<pre style="margin: 0;">+<span id="LC2009" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">Checks the invariants for CTyEqCan. In particular:</span></span></span>
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2000
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2010
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<pre style="margin: 0;"> <span id="LC2010" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (a) a forall type (forall a. blah)</span></span>
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2001
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2011
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<pre style="margin: 0;"> <span id="LC2011" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (b) a predicate type (c => ty)</span></span>
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2002
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2012
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<pre style="margin: 0;"> <span id="LC2012" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (c) a type family; see Note [Prevent unification with type families]</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2007" 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="2017" 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">@@ -2007,7 +2017,7 @@ preCheck :: DynFlags -> Bool -> TcTyVar -> TcType -> MetaTyVarUpdateResult ()</td>
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2007
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2017
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<pre style="margin: 0;"> <span id="LC2017" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- inside the kinds of variables it mentions. For (d) we look deeply</span></span>
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2008
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2018
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<pre style="margin: 0;"> <span id="LC2018" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- in coercions, and for (e) we do look in the kinds of course.</span></span>
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2009
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2019
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<pre style="margin: 0;"> <span id="LC2019" class="line" lang="haskell"></span>
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2010
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<pre style="margin: 0;">-<span id="LC2010" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left right">preC</span>heck</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">ty_fam_ok</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">ty</span></span>
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2020
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<pre style="margin: 0;">+<span id="LC2020" class="line" lang="haskell"><span class="n" style="color: #333;"><span class="idiff left right">mtvu_c</span>heck</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">ty_fam_ok</span> <span class="n" style="color: #333;">tv</span> <span class="n" style="color: #333;">ty</span></span>
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2011
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2021
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<pre style="margin: 0;"> <span id="LC2021" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fast_check</span> <span class="n" style="color: #333;">ty</span></span>
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2012
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2022
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<pre style="margin: 0;"> <span id="LC2022" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2013
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2023
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<pre style="margin: 0;"> <span id="LC2023" class="line" lang="haskell"> <span class="n" style="color: #333;">ok</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">MetaTyVarUpdateResult</span> <span class="nb" style="color: #0086b3;">()</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">@@ -2968,7 +2968,7 @@ commonly used commands.</td>
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2968
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2968
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<pre style="margin: 0;"> <span id="LC2968" class="line" lang="plaintext"></span>
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2969
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2969
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<pre style="margin: 0;"> <span id="LC2969" class="line" lang="plaintext"> Infers and prints the type of ⟨expression⟩. For polymorphic types</span>
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2970
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2970
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<pre style="margin: 0;"> <span id="LC2970" class="line" lang="plaintext"> it instantiates the 'inferred' forall quantifiers (but not the</span>
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2971
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<pre style="margin: 0;">-<span id="LC2971" class="line" lang="plaintext"> 'specified' ones), solves constraints, and re-generalises.</span>
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<pre style="margin: 0;">+<span id="LC2971" class="line" lang="plaintext"> 'specified' ones<span class="idiff left right">; see :ref:`inferred-vs-specified`</span>), solves constraints, and re-generalises.</span>
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<pre style="margin: 0;"> <span id="LC2972" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC2973" class="line" lang="plaintext"> .. code-block:: none</span>
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<pre style="margin: 0;"> <span id="LC2974" class="line" lang="plaintext"></span>
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