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<h3>
Richard Eisenberg pushed to branch wip/cfuneqcan-refactor
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c1caf60c9e2eff957f0ebf3136194da1c36361e8">c1caf60c</a></strong>
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<span>by Richard Eisenberg</span>
<i>at 2020-10-27T17:13:03-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add Detail (7) to the Note
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<h4>4 changed files:</h4>
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<a href="#f018e77421f495c6f75733fee4a511cfe57bebe8">
compiler/GHC/Tc/Solver/Canonical.hs
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<a href="#5461e7beeb7ae73d7c01f720cbaa3fa2c5333590">
compiler/GHC/Tc/Utils/TcType.hs
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<a href="#6ca209679471a502781714cc37f4036eca3380fd">
testsuite/tests/typecheck/should_fail/ContextStack2.hs
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testsuite/tests/typecheck/should_fail/GivenForallLoop.stderr
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<h4>Changes:</h4>
<li id="f018e77421f495c6f75733fee4a511cfe57bebe8">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c1caf60c9e2eff957f0ebf3136194da1c36361e8#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">@@ -2303,6 +2303,7 @@ canEqCanLHSFinish ev eq_rel swapped lhs rhs</td>
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<pre style="margin: 0;"> <span id="LC2303" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">OtherCIS</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">status</span></span>
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<pre style="margin: 0;"> <span id="LC2304" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Given</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ctEvFlavour</span> <span class="n" style="color: #333;">ev</span></span>
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<pre style="margin: 0;"> <span id="LC2305" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TyVarLHS</span> <span class="n" style="color: #333;">lhs_tv</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lhs</span></span>
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<pre style="margin: 0;">+<span id="LC2306" 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;">isCycleBreakerTyVar</span> <span class="n" style="color: #333;">lhs_tv</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- See Detail (7) of Note</span></span>
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<pre style="margin: 0;"> <span id="LC2307" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">NomEq</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">eq_rel</span></span>
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<pre style="margin: 0;"> <span id="LC2308" 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;">traceTcS</span> <span class="s" style="color: #d14;">"canEqCanLHSFinish breaking a cycle"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">lhs</span> <span class="o" style="font-weight: 600;">$$</span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">rhs</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC2309" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">new_rhs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">breakTyVarCycle</span> <span class="p">(</span><span class="n" style="color: #333;">ctEvLoc</span> <span class="n" style="color: #333;">ev</span><span class="p">)</span> <span class="n" style="color: #333;">rhs</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2712" 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">@@ -2711,6 +2712,41 @@ Details:</td>
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<pre style="margin: 0;"> <span id="LC2712" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> breaker variables are all zonked away by the time we examine the</span></span>
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<pre style="margin: 0;"> <span id="LC2713" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> evidence.</span></span>
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<pre style="margin: 0;"> <span id="LC2714" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2715" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (7) We don't wish to apply this magic to CycleBreakerTvs themselves.</span></span>
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<pre style="margin: 0;">+<span id="LC2716" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Consider this, from typecheck/should_compile/ContextStack2:</span></span>
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<pre style="margin: 0;">+<span id="LC2717" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2718" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type instance TF (a, b) = (TF a, TF b)</span></span>
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<pre style="margin: 0;">+<span id="LC2719" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> t :: (a ~ TF (a, Int)) => ...</span></span>
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<pre style="margin: 0;">+<span id="LC2720" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2721" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [G] a ~ TF (a, Int)</span></span>
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<pre style="margin: 0;">+<span id="LC2722" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC2723" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> The RHS reduces, so we get</span></span>
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2724
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<pre style="margin: 0;">+<span id="LC2724" class="line" lang="haskell"></span>
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<td class="diff-line-num new new_line" data-linenumber="2725" 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">
2725
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<pre style="margin: 0;">+<span id="LC2725" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [G] a ~ (TF a, TF Int)</span></span>
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2726
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<pre style="margin: 0;">+<span id="LC2726" class="line" lang="haskell"></span>
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2727
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<pre style="margin: 0;">+<span id="LC2727" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> We then break cycles, to get</span></span>
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2728
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<pre style="margin: 0;">+<span id="LC2728" class="line" lang="haskell"></span>
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<td class="diff-line-num new new_line" data-linenumber="2729" 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">
2729
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<pre style="margin: 0;">+<span id="LC2729" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [G] g1 :: a ~ (cbv1, cbv2)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2730" 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">
2730
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<pre style="margin: 0;">+<span id="LC2730" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [G] g2 :: TF a ~ cbv1</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2731" 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">
2731
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<pre style="margin: 0;">+<span id="LC2731" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [G] g3 :: TF Int ~ cbv2</span></span>
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2732
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<pre style="margin: 0;">+<span id="LC2732" class="line" lang="haskell"></span>
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2733
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<pre style="margin: 0;">+<span id="LC2733" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g1 gets added to the inert set, as written. But then g2 becomes</span></span>
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2734
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<pre style="margin: 0;">+<span id="LC2734" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> the work item. g1 rewrites g2 to become</span></span>
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2735
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<pre style="margin: 0;">+<span id="LC2735" class="line" lang="haskell"></span>
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2736
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<pre style="margin: 0;">+<span id="LC2736" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [G] TF (cbv1, cbv2) ~ cbv1</span></span>
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2737
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<pre style="margin: 0;">+<span id="LC2737" class="line" lang="haskell"></span>
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<td class="diff-line-num new new_line" data-linenumber="2738" 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">
2738
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<pre style="margin: 0;">+<span id="LC2738" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> which then uses the type instance to become</span></span>
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2739
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<pre style="margin: 0;">+<span id="LC2739" class="line" lang="haskell"></span>
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2740
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<pre style="margin: 0;">+<span id="LC2740" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [G] (TF cbv1, TF cbv2) ~ cbv1</span></span>
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2741
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<pre style="margin: 0;">+<span id="LC2741" class="line" lang="haskell"></span>
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2742
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<pre style="margin: 0;">+<span id="LC2742" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> which looks remarkably like the Given we started with. If left</span></span>
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2743
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<pre style="margin: 0;">+<span id="LC2743" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> unchecked, this will end up breaking cycles again, looping ad</span></span>
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2744
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<pre style="margin: 0;">+<span id="LC2744" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> infinitum (and resulting in a context-stack reduction error,</span></span>
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2745
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<pre style="margin: 0;">+<span id="LC2745" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> not an outright loop). The solution is easy: don't break cycles</span></span>
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2746
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<pre style="margin: 0;">+<span id="LC2746" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> if the var is already a CycleBreakerTv. This makes sense, because</span></span>
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<td class="diff-line-num new new_line" data-linenumber="2747" 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">
2747
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<pre style="margin: 0;">+<span id="LC2747" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> we only want to break cycles for user-written loopy Givens, and</span></span>
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<pre style="margin: 0;">+<span id="LC2748" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a CycleBreakerTv certainly isn't user-written.</span></span>
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2749
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<pre style="margin: 0;">+<span id="LC2749" class="line" lang="haskell"></span>
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2750
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<pre style="margin: 0;"> <span id="LC2750" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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2751
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<pre style="margin: 0;"> <span id="LC2751" class="line" lang="haskell"></span>
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2752
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<pre style="margin: 0;"> <span id="LC2752" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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<li id="5461e7beeb7ae73d7c01f720cbaa3fa2c5333590">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c1caf60c9e2eff957f0ebf3136194da1c36361e8#5461e7beeb7ae73d7c01f720cbaa3fa2c5333590"><strong>compiler/GHC/Tc/Utils/TcType.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -39,7 +39,7 @@ module GHC.Tc.Utils.TcType (</td>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MetaDetails</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Flexi</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Indirect</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">MetaInfo</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isImmutableTyVar</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isSkolemTyVar</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isMetaTyVar</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isMetaTyVarTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isTyVarTy</span><span class="p">,</span></span>
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41
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcIsTcTyVar</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isTyVarTyVar</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isOverlappableTyVar</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isTyConableTyVar</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC42" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isAmbiguousTyVar</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">metaTyVarRef</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">metaTyVarInfo</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC42" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isAmbiguousTyVar</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;"><span class="idiff left">isCycleBreakerTyVar</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff right"> </span><span class="nf" style="color: #900; font-weight: 600;">metaTyVarRef</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">metaTyVarInfo</span><span class="p">,</span></span>
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43
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isFlexi</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isIndirect</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">isRuntimeUnkSkol</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">metaTyVarTcLevel</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">setMetaTyVarTcLevel</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">metaTyVarTcLevel_maybe</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">isTouchableMetaTyVar</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">@@ -1019,7 +1019,7 @@ isImmutableTyVar :: TyVar -> Bool</td>
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1019
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<pre style="margin: 0;"> <span id="LC1019" class="line" lang="haskell"><span class="n" style="color: #333;">isImmutableTyVar</span> <span class="n" style="color: #333;">tv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isSkolemTyVar</span> <span class="n" style="color: #333;">tv</span></span>
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1020
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1020
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<pre style="margin: 0;"> <span id="LC1020" class="line" lang="haskell"></span>
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1021
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<pre style="margin: 0;"> <span id="LC1021" class="line" lang="haskell"><span class="n" style="color: #333;">isTyConableTyVar</span><span class="p">,</span> <span class="n" style="color: #333;">isSkolemTyVar</span><span class="p">,</span> <span class="n" style="color: #333;">isOverlappableTyVar</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC1022" class="line" lang="haskell"> <span class="n" style="color: #333;">isMetaTyVar</span><span class="p">,</span> <span class="n" style="color: #333;">isAmbiguousTyVar</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;">Bool</span></span>
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<pre style="margin: 0;">+<span id="LC1022" class="line" lang="haskell"> <span class="n" style="color: #333;">isMetaTyVar</span><span class="p">,</span> <span class="n" style="color: #333;">isAmbiguousTyVar</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">isCycleBreakerTyVar</span></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;">Bool</span></span>
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1023
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1023
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<pre style="margin: 0;"> <span id="LC1023" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1024" class="line" lang="haskell"><span class="n" style="color: #333;">isTyConableTyVar</span> <span class="n" style="color: #333;">tv</span></span>
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<pre style="margin: 0;"> <span id="LC1025" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- True of a meta-type variable that can be filled in</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">@@ -1064,6 +1064,14 @@ isAmbiguousTyVar tv</td>
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<pre style="margin: 0;"> <span id="LC1064" class="line" lang="haskell"> <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;">False</span></span>
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1065
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<pre style="margin: 0;"> <span id="LC1065" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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1066
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<pre style="margin: 0;"> <span id="LC1066" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1067" class="line" lang="haskell"><span class="n" style="color: #333;">isCycleBreakerTyVar</span> <span class="n" style="color: #333;">tv</span></span>
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<pre style="margin: 0;">+<span id="LC1068" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isTyVar</span> <span class="n" style="color: #333;">tv</span> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Coercion variables in free variable lists]</span></span>
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1069
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<pre style="margin: 0;">+<span id="LC1069" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">MetaTv</span> <span class="p">{</span> <span class="n" style="color: #333;">mtv_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">CycleBreakerTv</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcTyVarDetails</span> <span class="n" style="color: #333;">tv</span></span>
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<pre style="margin: 0;">+<span id="LC1070" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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1071
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<pre style="margin: 0;">+<span id="LC1071" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1072" 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="LC1073" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">+<span id="LC1074" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1075" class="line" lang="haskell"><span class="n" style="color: #333;">isMetaTyVarTy</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;">Bool</span></span>
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1076
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<pre style="margin: 0;"> <span id="LC1076" class="line" lang="haskell"><span class="n" style="color: #333;">isMetaTyVarTy</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">TyVarTy</span> <span class="n" style="color: #333;">tv</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isMetaTyVar</span> <span class="n" style="color: #333;">tv</span></span>
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1077
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<pre style="margin: 0;"> <span id="LC1077" class="line" lang="haskell"><span class="n" style="color: #333;">isMetaTyVarTy</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;">False</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c1caf60c9e2eff957f0ebf3136194da1c36361e8#6ca209679471a502781714cc37f4036eca3380fd"><strong>testsuite/tests/typecheck/should_fail/ContextStack2.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">@@ -12,11 +12,11 @@ type instance TF (a,b) = (TF a, TF b)</td>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="haskell"><span class="n" style="color: #333;">t</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</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;">TF</span> <span class="p">(</span><span class="n" style="color: #333;">a</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="haskell"><span class="n" style="color: #333;">t</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">undefined</span></span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC15" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- a ~ TF (a,Int)<span class="idiff left right"> </span></span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- a ~ TF (a,Int)</span></span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ~ (TF a, TF Int)</span></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ~ (TF (TF (a,Int)), TF Int)</span></span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ~ (TF (TF a, TF Int), TF Int)</span></span>
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<pre style="margin: 0;">-<span id="LC19" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ~ ((TF (TF a), TF (TF Int)), TF Int)<span class="idiff left right"> </span></span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ~ ((TF (TF a), TF (TF Int)), TF Int)</span></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> fsk ~ a</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">@@ -28,7 +28,7 @@ t = undefined</td>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a ~ (TF a, TF Int)</span></span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (flatten rhs)</span></span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a ~ (fsk1, TF Int)</span></span>
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<pre style="margin: 0;">-<span id="LC31" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(wk) TF a ~ fsk1<span class="idiff left right"> </span></span></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(wk) TF a ~ fsk1</span></span>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">--> (rewrite inert)</span></span>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="haskell"></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">@@ -43,7 +43,7 @@ t = undefined</td>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* TF (fsk1, fsk2) ~ fsk1</span></span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(wk) TF Tnt ~ fsk2</span></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC46" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">--><span class="idiff left right"> </span></span></span>
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<pre style="margin: 0;">+<span id="LC46" 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="LC47" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> fsk ~ (fsk1, TF Int)</span></span>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a ~ (fsk1, TF Int)</span></span>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="haskell"></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">@@ -51,7 +51,7 @@ t = undefined</td>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (flatten rhs)</span></span>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> fsk1 ~ (fsk3, TF fsk2)</span></span>
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<pre style="margin: 0;"> <span id="LC53" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC54" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"><span class="idiff left right"> </span></span></span>
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<pre style="margin: 0;">+<span id="LC54" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(wk) TF Int ~ fsk2</span></span>
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> TF fsk1 ~ fsk3</span></span>
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<pre style="margin: 0;"> <span id="LC57" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c1caf60c9e2eff957f0ebf3136194da1c36361e8#8380963627debcbf83f5704382dd2f10736de169"><strong>testsuite/tests/typecheck/should_fail/GivenForallLoop.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">GivenForallLoop.hs:8:11: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Could not deduce: a ~ b</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> from the context: a ~ (forall b1. F a b1)</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> bound by the type signature for:</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> loopy :: forall a b. (a ~ (forall b1. F a b1)) => a -> b</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> at GivenForallLoop.hs:7:1-42</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext"> ‘a’ is a rigid type variable bound by</span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext"> the type signature for:</span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext"> loopy :: forall a b. (a ~ (forall b1. F a b1)) => a -> b</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext"> at GivenForallLoop.hs:7:1-42</span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext"> ‘b’ is a rigid type variable bound by</span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext"> the type signature for:</span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext"> loopy :: forall a b. (a ~ (forall b1. F a b1)) => a -> b</span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="plaintext"> at GivenForallLoop.hs:7:1-42</span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="plaintext"> • In the expression: x</span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="plaintext"> In an equation for ‘loopy’: loopy x = x</span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext"> • Relevant bindings include</span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="plaintext"> x :: a (bound at GivenForallLoop.hs:8:7)</span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="plaintext"> loopy :: a -> b (bound at GivenForallLoop.hs:8:1)</span></pre>
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