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<h3>
Richard Eisenberg pushed to branch wip/T19044
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/a65abc31007f57cff07a942eead7684c9eb6b857">a65abc31</a></strong>
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<span>by Richard Eisenberg</span>
<i>at 2020-12-16T14:47:39-05:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #19044 by tweaking unification in inst lookup
See Note [Infinitary substitution in lookup] in GHC.Core.InstEnv
and Note [Unification result] in GHC.Core.Unify.
Test case: typecheck/should_compile/T190{44,52}
Close #19044
Close #19052
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<h4>5 changed files:</h4>
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<a href="#5596bb0f228bd2a308c4391df97375ae879430a8">
compiler/GHC/Core/InstEnv.hs
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<a href="#89a2e0e1a3095c7a42b10f2819049908908080e8">
compiler/GHC/Core/Unify.hs
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testsuite/tests/typecheck/should_compile/T19044.hs
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testsuite/tests/typecheck/should_compile/T19052.hs
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<a href="#34fe7bf0e6fbf60effb28393399ba68666593909">
testsuite/tests/typecheck/should_compile/all.T
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<h4>Changes:</h4>
<li id="5596bb0f228bd2a308c4391df97375ae879430a8">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a65abc31007f57cff07a942eead7684c9eb6b857#5596bb0f228bd2a308c4391df97375ae879430a8"><strong>compiler/GHC/Core/InstEnv.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">@@ -760,6 +760,49 @@ When we match this against D [ty], we return the instantiating types</td>
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<pre style="margin: 0;"> <span id="LC760" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">where the 'Nothing' indicates that 'b' can be freely instantiated.</span></span>
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<pre style="margin: 0;"> <span id="LC761" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(The caller instantiates it to a flexi type variable, which will</span></span>
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<pre style="margin: 0;"> <span id="LC762" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> presumably later become fixed via functional dependencies.)</span></span>
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<pre style="margin: 0;">+<span id="LC763" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC764" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Infinitary substitution in lookup]</span></span>
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<pre style="margin: 0;">+<span id="LC765" 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="LC766" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Consider</span></span>
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<pre style="margin: 0;">+<span id="LC767" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC768" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> class C a b</span></span>
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<pre style="margin: 0;">+<span id="LC769" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance C c c</span></span>
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<pre style="margin: 0;">+<span id="LC770" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance C d (Maybe d)</span></span>
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<pre style="margin: 0;">+<span id="LC771" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] C e (Maybe e)</span></span>
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<pre style="margin: 0;">+<span id="LC772" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC773" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">You would think we could just use the second instance, because the first doesn't</span></span>
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<pre style="margin: 0;">+<span id="LC774" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">unify. But that's just ever so slightly wrong. The reason we check for unifiers</span></span>
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<pre style="margin: 0;">+<span id="LC775" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">along with matchers is that we don't want the possibility that a type variable</span></span>
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<pre style="margin: 0;">+<span id="LC776" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">instantiation could cause an instance choice to change. Yet if we have</span></span>
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<pre style="margin: 0;">+<span id="LC777" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type family M = Maybe M</span></span>
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<pre style="margin: 0;">+<span id="LC778" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and choose (e |-> M), then both instances match. This is absurd, but we cannot</span></span>
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<pre style="margin: 0;">+<span id="LC779" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">rule it out. Yet, worrying about this case is awfully inconvenient to users,</span></span>
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<pre style="margin: 0;">+<span id="LC780" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and so we pretend the problem doesn't exist, by considering a lookup that runs into</span></span>
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781
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<pre style="margin: 0;">+<span id="LC781" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">this occurs-check issue to indicate that an instance surely does not apply (i.e.</span></span>
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782
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<pre style="margin: 0;">+<span id="LC782" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is like the SurelyApart case). In the brief time that we didn't treat infinitary</span></span>
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783
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<pre style="margin: 0;">+<span id="LC783" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">substitutions specially, two tickets were filed: #19044 and #19052, both trying</span></span>
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784
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<pre style="margin: 0;">+<span id="LC784" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to do Real Work.</span></span>
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785
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<pre style="margin: 0;">+<span id="LC785" class="line" lang="haskell"></span>
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786
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<pre style="margin: 0;">+<span id="LC786" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Why don't we just exclude any instances that are MaybeApart? Because we might</span></span>
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787
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<pre style="margin: 0;">+<span id="LC787" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">have a [W] C e (F e), where F is a type family. The second instance above does</span></span>
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788
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<pre style="margin: 0;">+<span id="LC788" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">not match, but it should be included as a future possibility. Unification will</span></span>
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789
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<pre style="margin: 0;">+<span id="LC789" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">return MaybeApart MARTypeFamily in this case.</span></span>
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790
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<pre style="margin: 0;">+<span id="LC790" class="line" lang="haskell"></span>
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791
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<pre style="margin: 0;">+<span id="LC791" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">What can go wrong with this design choice? We might get incoherence -- but not</span></span>
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792
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<pre style="margin: 0;">+<span id="LC792" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">loss of type safety. In particular, if we have [W] C M M (for the M type family</span></span>
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793
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<pre style="margin: 0;">+<span id="LC793" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">above), then GHC might arbitrarily choose either instance, depending on how</span></span>
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794
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<pre style="margin: 0;">+<span id="LC794" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">M reduces (or doesn't).</span></span>
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795
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<pre style="margin: 0;">+<span id="LC795" class="line" lang="haskell"></span>
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796
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<pre style="margin: 0;">+<span id="LC796" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For type families, we can't just ignore the problem (as we essentially do here),</span></span>
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797
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<pre style="margin: 0;">+<span id="LC797" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">because doing so would give us a hole in the type safety proof (as explored in</span></span>
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798
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<pre style="margin: 0;">+<span id="LC798" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Section 6 of "Closed Type Families with Overlapping Equations", POPL'14). This</span></span>
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799
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<pre style="margin: 0;">+<span id="LC799" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">possibility of an infinitary substitution manifests as closed type families that</span></span>
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800
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<pre style="margin: 0;">+<span id="LC800" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">look like they should reduce, but don't. Users complain: #9082 and #17311. For</span></span>
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801
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<pre style="margin: 0;">+<span id="LC801" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">open type families, we actually can have unsoundness if we don't take infinitary</span></span>
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802
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<pre style="margin: 0;">+<span id="LC802" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">substitutions into account: #8162. But, luckily, for class instances, we just</span></span>
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803
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<pre style="margin: 0;">+<span id="LC803" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">risk coherence -- not great, but it seems better to give users what they likely</span></span>
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804
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<pre style="margin: 0;">+<span id="LC804" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">want. (Also, note that this problem existed for the entire decade of 201x without</span></span>
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<pre style="margin: 0;">+<span id="LC805" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">anyone noticing, so it's manifestly not ruining anyone's day.)</span></span>
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<pre style="margin: 0;"> <span id="LC806" 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="LC807" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC808" class="line" lang="haskell"><span class="cd">-- |Look up an instance in the given instance environment. The given class application must match exactly</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">@@ -839,8 +882,10 @@ lookupInstEnv' ie vis_mods cls tys</td>
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<pre style="margin: 0;"> <span id="LC882" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We consider MaybeApart to be a case where the instance might</span></span>
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<pre style="margin: 0;"> <span id="LC883" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- apply in the future. This covers an instance like C Int and</span></span>
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<pre style="margin: 0;"> <span id="LC884" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- a target like [W] C (F a), where F is a type family.</span></span>
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<pre style="margin: 0;">-<span id="LC842" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SurelyApart</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">find</span> <span class="n" style="color: #333;">ms</span> <span class="n" style="color: #333;">us</span> <span class="n" style="color: #333;">rest</span></span>
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<pre style="margin: 0;">-<span id="LC843" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">find</span> <span class="n" style="color: #333;">ms</span> <span class="p">(</span><span class="n" style="color: #333;">item</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">us</span><span class="p">)</span> <span class="n" style="color: #333;">rest</span></span>
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<pre style="margin: 0;">+<span id="LC885" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SurelyApart</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">find</span> <span class="n" style="color: #333;">ms</span> <span class="n" style="color: #333;">us</span> <span class="n" style="color: #333;">rest</span></span>
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<pre style="margin: 0;">+<span id="LC886" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Note [Infinitary substitution in lookup]</span></span>
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<pre style="margin: 0;">+<span id="LC887" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MaybeApart</span> <span class="kt" style="color: #458; font-weight: 600;">MARInfinite</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">find</span> <span class="n" style="color: #333;">ms</span> <span class="n" style="color: #333;">us</span> <span class="n" style="color: #333;">rest</span></span>
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<pre style="margin: 0;">+<span id="LC888" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">find</span> <span class="n" style="color: #333;">ms</span> <span class="p">(</span><span class="n" style="color: #333;">item</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">us</span><span class="p">)</span> <span class="n" style="color: #333;">rest</span></span>
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<pre style="margin: 0;"> <span id="LC889" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC890" class="line" lang="haskell"> <span class="n" style="color: #333;">tpl_tv_set</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkVarSet</span> <span class="n" style="color: #333;">tpl_tvs</span></span>
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<pre style="margin: 0;"> <span id="LC891" class="line" lang="haskell"> <span class="n" style="color: #333;">tys_tv_set</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tyCoVarsOfTypes</span> <span class="n" style="color: #333;">tys</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a65abc31007f57cff07a942eead7684c9eb6b857#89a2e0e1a3095c7a42b10f2819049908908080e8"><strong>compiler/GHC/Core/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">@@ -18,7 +18,7 @@ module GHC.Core.Unify (</td>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">tcUnifyTy</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcUnifyTyKi</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcUnifyTys</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcUnifyTyKis</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;">tcUnifyTysFG</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">tcUnifyTyWithTFs</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">BindFlag</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="LC21" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">UnifyResult</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">UnifyResultM</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="LC21" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">UnifyResult</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">UnifyResultM</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span><span class="idiff left"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">MaybeApartReason</span></span><span class="p"><span class="idiff">(</span></span><span class="o" style="font-weight: 600;"><span class="idiff">..</span></span><span class="p"><span class="idiff right">),</span></span></span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Matching a type against a lifted type (coercion)</span></span>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">liftCoMatch</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">@@ -55,8 +55,7 @@ import GHC.Data.FastString</td>
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.List</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">mapAccumL</span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC57" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Monad</span></span>
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<pre style="margin: 0;">-<span id="LC58" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Applicative</span> <span class="k" style="font-weight: 600;">hiding</span> <span class="p">(</span> <span class="nf" style="color: #900; font-weight: 600;">empty</span> <span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC59" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="k" style="font-weight: 600;">qualified</span> <span class="nn" style="color: #555;">Control.Applicative</span></span>
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<pre style="margin: 0;">+<span id="LC58" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="k" style="font-weight: 600;">qualified</span> <span class="nn" style="color: #555;">Data.Semigroup</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">S</span></span>
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<pre style="margin: 0;"> <span id="LC59" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC60" 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="LC61" 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">@@ -347,6 +346,46 @@ complete. This means that, sometimes, a closed type family does not reduce</td>
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<pre style="margin: 0;"> <span id="LC346" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">when it should. See test case indexed-types/should_fail/Overlap15 for an</span></span>
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<pre style="margin: 0;"> <span id="LC347" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">example.</span></span>
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<pre style="margin: 0;"> <span id="LC348" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC349" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Unificiation result]</span></span>
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<pre style="margin: 0;">+<span id="LC350" 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="LC351" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">When unifying t1 ~ t2, we return</span></span>
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<pre style="margin: 0;">+<span id="LC352" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Unifiable s, if s is a substitution such that s(t1) is syntactically the</span></span>
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<pre style="margin: 0;">+<span id="LC353" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> same as s(t2), modulo type-synonym expansion.</span></span>
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<pre style="margin: 0;">+<span id="LC354" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* SurelyApart, if there is no substitution s such that s(t1) = s(t2),</span></span>
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<pre style="margin: 0;">+<span id="LC355" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> where "=" includes type-family reductions.</span></span>
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<pre style="margin: 0;">+<span id="LC356" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* MaybeApart mar s, when we aren't sure. `mar` is a MaybeApartReason.</span></span>
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<pre style="margin: 0;">+<span id="LC357" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC358" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Examples</span></span>
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<pre style="margin: 0;">+<span id="LC359" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* [a] ~ Maybe b: SurelyApart, because [] and Maybe can't unify</span></span>
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<pre style="margin: 0;">+<span id="LC360" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* [(a,Int)] ~ [(Bool,b)]: Unifiable</span></span>
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<pre style="margin: 0;">+<span id="LC361" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* [F Int] ~ [Bool]: MaybeApart MARTypeFamily, because F Int might reduce to Bool (the unifier</span></span>
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<pre style="margin: 0;">+<span id="LC362" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> does not try this)</span></span>
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<pre style="margin: 0;">+<span id="LC363" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* a ~ Maybe a: MaybeApart MARInfinite. Not Unifiable clearly, but not SurelyApart either; consider</span></span>
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<pre style="margin: 0;">+<span id="LC364" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a := Loop</span></span>
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<pre style="margin: 0;">+<span id="LC365" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> where type family Loop where Loop = Maybe Loop</span></span>
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<pre style="margin: 0;">+<span id="LC366" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC367" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">There is the possibility that two types are MaybeApart for *both* reasons:</span></span>
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368
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<pre style="margin: 0;">+<span id="LC368" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC369" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* (a, F Int) ~ (Maybe a, Bool)</span></span>
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370
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<pre style="margin: 0;">+<span id="LC370" class="line" lang="haskell"></span>
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371
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<pre style="margin: 0;">+<span id="LC371" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">What reason should we use? The *only* consumer of the reason is described</span></span>
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372
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<pre style="margin: 0;">+<span id="LC372" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in Note [Infinitary substitution in lookup] in GHC.Core.InstEnv. The goal</span></span>
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373
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<pre style="margin: 0;">+<span id="LC373" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">there is identify which instances might match a target later (but don't</span></span>
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374
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<pre style="margin: 0;">+<span id="LC374" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">match now) -- except that we want to ignore the possibility of infinitary</span></span>
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375
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<pre style="margin: 0;">+<span id="LC375" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">substitutions. So let's examine a concrete scenario:</span></span>
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376
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<pre style="margin: 0;">+<span id="LC376" class="line" lang="haskell"></span>
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377
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<pre style="margin: 0;">+<span id="LC377" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> class C a b c</span></span>
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<pre style="margin: 0;">+<span id="LC378" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> instance C a (Maybe a) Bool</span></span>
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379
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<pre style="margin: 0;">+<span id="LC379" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- other instances, including one that will actually match</span></span>
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<pre style="margin: 0;">+<span id="LC380" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] C b b (F Int)</span></span>
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<pre style="margin: 0;">+<span id="LC381" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC382" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Do we want the instance as a future possibility? No. The only way that</span></span>
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383
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<pre style="margin: 0;">+<span id="LC383" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">instance can match is in the presence of an infinite type (infinitely</span></span>
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384
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<pre style="margin: 0;">+<span id="LC384" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">nested Maybes). We thus say that MARInfinite takes precedence, so that</span></span>
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<pre style="margin: 0;">+<span id="LC385" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">InstEnv treats this case as an infinitary substitution case; the fact</span></span>
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<pre style="margin: 0;">+<span id="LC386" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that a type family is involved is only incidental. We thus define</span></span>
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<pre style="margin: 0;">+<span id="LC387" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the Semigroup instance for MaybeApartReason to prefer MARInfinite.</span></span>
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<pre style="margin: 0;">+<span id="LC388" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC389" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [The substitution in MaybeApart]</span></span>
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<pre style="margin: 0;"> <span id="LC390" 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="LC391" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The constructor MaybeApart carries data with it, typically a TvSubstEnv. Why?</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">@@ -391,8 +430,8 @@ tcUnifyTyWithTFs twoWay t1 t2</td>
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<pre style="margin: 0;"> <span id="LC430" 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;">tc_unify_tys</span> <span class="p">(</span><span class="n" style="color: #333;">const</span> <span class="kt" style="color: #458; font-weight: 600;">BindMe</span><span class="p">)</span> <span class="n" style="color: #333;">twoWay</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;"> <span id="LC431" class="line" lang="haskell"> <span class="n" style="color: #333;">rn_env</span> <span class="n" style="color: #333;">emptyTvSubstEnv</span> <span class="n" style="color: #333;">emptyCvSubstEnv</span></span>
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<pre style="margin: 0;"> <span id="LC432" class="line" lang="haskell"> <span class="p">[</span><span class="n" style="color: #333;">t1</span><span class="p">]</span> <span class="p">[</span><span class="n" style="color: #333;">t2</span><span class="p">]</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC394" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Unifiable</span> <span class="p">(</span><span class="n" style="color: #333;">subst</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">maybe_fix</span> <span class="n" style="color: #333;">subst</span></span>
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395
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<pre style="margin: 0;">-<span id="LC395" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MaybeApart</span> <span class="p">(</span><span class="n" style="color: #333;">subst</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">maybe_fix</span> <span class="n" style="color: #333;">subst</span></span>
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<pre style="margin: 0;">+<span id="LC433" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Unifiable</span> <span class="idiff left right"> </span><span class="p">(</span><span class="n" style="color: #333;">subst</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">maybe_fix</span> <span class="n" style="color: #333;">subst</span></span>
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<pre style="margin: 0;">+<span id="LC434" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MaybeApart</span> <span class="n" style="color: #333;"><span class="idiff left">_reason</span></span><span class="idiff right"> </span><span class="p">(</span><span class="n" style="color: #333;">subst</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">maybe_fix</span> <span class="n" style="color: #333;">subst</span></span>
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<pre style="margin: 0;"> <span id="LC435" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we want to *succeed* in questionable cases. This is a</span></span>
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<pre style="margin: 0;"> <span id="LC436" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- pre-unification algorithm.</span></span>
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<pre style="margin: 0;"> <span id="LC437" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SurelyApart</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</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">@@ -431,36 +470,42 @@ tcUnifyTyKis bind_fn tys1 tys2</td>
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<pre style="margin: 0;"> <span id="LC470" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This type does double-duty. It is used in the UM (unifier monad) and to</span></span>
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<pre style="margin: 0;"> <span id="LC471" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- return the final result. See Note [Fine-grained unification]</span></span>
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<pre style="margin: 0;"> <span id="LC472" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">UnifyResult</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">UnifyResultM</span> <span class="kt" style="color: #458; font-weight: 600;">TCvSubst</span></span>
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<pre style="margin: 0;">+<span id="LC473" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC474" class="line" lang="haskell"><span class="cd">-- | See Note [Unificiation result]</span></span>
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<pre style="margin: 0;"> <span id="LC475" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">UnifyResultM</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;">Unifiable</span> <span class="n" style="color: #333;">a</span> <span class="c1" style="color: #998; font-style: italic;">-- the subst that unifies the types</span></span>
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<pre style="margin: 0;">-<span id="LC435" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeApart</span> <span class="n" style="color: #333;">a</span> <span class="c1" style="color: #998; font-style: italic;">-- the subst has as much as we know</span></span>
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<pre style="margin: 0;">+<span id="LC476" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeApart</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeApartReason</span></span>
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<pre style="margin: 0;">+<span id="LC477" class="line" lang="haskell"> <span class="n" style="color: #333;">a</span> <span class="c1" style="color: #998; font-style: italic;">-- the subst has as much as we know</span></span>
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<pre style="margin: 0;"> <span id="LC478" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- it must be part of a most general unifier</span></span>
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<pre style="margin: 0;"> <span id="LC479" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [The substitution in MaybeApart]</span></span>
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<pre style="margin: 0;"> <span id="LC480" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">SurelyApart</span></span>
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<pre style="margin: 0;"> <span id="LC481" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Functor</span></span>
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<pre style="margin: 0;"> <span id="LC482" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC483" class="line" lang="haskell"><span class="cd">-- | Why are two types 'MaybeApart'? 'MARTypeFamily' takes precedence:</span></span>
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<pre style="margin: 0;">+<span id="LC484" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This is used (only) in Note [Infinitary substitution in lookup] in GHC.Core.InstEnv</span></span>
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<pre style="margin: 0;">+<span id="LC485" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeApartReason</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MARTypeFamily</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ matching e.g. F Int ~? Bool</span></span>
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<pre style="margin: 0;">+<span id="LC486" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">MARInfinite</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ matching e.g. a ~? Maybe a</span></span>
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<pre style="margin: 0;">+<span id="LC487" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC488" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeApartReason</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC489" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">MARTypeFamily</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"MARTypeFamily"</span></span>
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<pre style="margin: 0;">+<span id="LC490" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">MARInfinite</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"MARInfinite"</span></span>
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<pre style="margin: 0;">+<span id="LC491" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC492" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Semigroup</span> <span class="kt" style="color: #458; font-weight: 600;">MaybeApartReason</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC493" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- see end of Note [Unification result] for why</span></span>
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<pre style="margin: 0;">+<span id="LC494" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MARTypeFamily</span> <span class="o" style="font-weight: 600;"><></span> <span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">r</span></span>
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<pre style="margin: 0;">+<span id="LC495" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MARInfinite</span> <span class="o" style="font-weight: 600;"><></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;">MARInfinite</span></span>
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<pre style="margin: 0;">+<span id="LC496" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC497" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Applicative</span> <span class="kt" style="color: #458; font-weight: 600;">UnifyResultM</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC498" class="line" lang="haskell"> <span class="n" style="color: #333;">pure</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Unifiable</span></span>
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<pre style="margin: 0;"> <span id="LC499" class="line" lang="haskell"> <span class="p">(</span><span class="o" style="font-weight: 600;"><*></span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">ap</span></span>
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<pre style="margin: 0;"> <span id="LC500" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC501" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Monad</span> <span class="kt" style="color: #458; font-weight: 600;">UnifyResultM</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC446" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC502" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SurelyApart</span> <span class="o" style="font-weight: 600;">>>=</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;">SurelyApart</span></span>
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<pre style="margin: 0;">-<span id="LC448" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MaybeApart</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">x</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC449" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Unifiable</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeApart</span> <span class="n" style="color: #333;">y</span></span>
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<pre style="margin: 0;">-<span id="LC450" class="line" lang="haskell"> <span class="n" style="color: #333;">other</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">other</span></span>
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<pre style="margin: 0;">+<span id="LC503" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MaybeApart</span> <span class="n" style="color: #333;">r1</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">x</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">+<span id="LC504" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Unifiable</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeApart</span> <span class="n" style="color: #333;">r1</span> <span class="n" style="color: #333;">y</span></span>
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<pre style="margin: 0;">+<span id="LC505" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MaybeApart</span> <span class="n" style="color: #333;">r2</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeApart</span> <span class="p">(</span><span class="n" style="color: #333;">r1</span> <span class="kt" style="color: #458; font-weight: 600;">S</span><span class="o" style="font-weight: 600;">.<></span> <span class="n" style="color: #333;">r2</span><span class="p">)</span> <span class="n" style="color: #333;">y</span></span>
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<pre style="margin: 0;">+<span id="LC506" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SurelyApart</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SurelyApart</span></span>
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<pre style="margin: 0;"> <span id="LC507" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Unifiable</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">>>=</span> <span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">f</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;"> <span id="LC508" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC453" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Alternative</span> <span class="kt" style="color: #458; font-weight: 600;">UnifyResultM</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC454" class="line" lang="haskell"> <span class="n" style="color: #333;">empty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SurelyApart</span></span>
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<pre style="margin: 0;">-<span id="LC455" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC456" class="line" lang="haskell"> <span class="n" style="color: #333;">a</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Unifiable</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;"><|></span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">-<span id="LC457" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><|></span> <span class="n" style="color: #333;">b</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Unifiable</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">b</span></span>
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<pre style="margin: 0;">-<span id="LC458" class="line" lang="haskell"> <span class="n" style="color: #333;">a</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MaybeApart</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;"><|></span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">-<span id="LC459" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><|></span> <span class="n" style="color: #333;">b</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MaybeApart</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">b</span></span>
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<pre style="margin: 0;">-<span id="LC460" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SurelyApart</span> <span class="o" style="font-weight: 600;"><|></span> <span class="kt" style="color: #458; font-weight: 600;">SurelyApart</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">SurelyApart</span></span>
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<pre style="margin: 0;">-<span id="LC461" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC462" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">MonadPlus</span> <span class="kt" style="color: #458; font-weight: 600;">UnifyResultM</span></span>
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<pre style="margin: 0;">-<span id="LC463" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC509" class="line" lang="haskell"><span class="cd">-- | @tcUnifyTysFG bind_tv tys1 tys2@ attepts to find a substitution @s@ (whose</span></span>
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<pre style="margin: 0;"> <span id="LC510" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- domain elements all respond 'BindMe' to @bind_tv@) such that</span></span>
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<pre style="margin: 0;"> <span id="LC511" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- @s(tys1)@ and that of @s(tys2)@ are equal, as witnessed by the returned</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">@@ -530,9 +575,9 @@ tc_unify_tys bind_fn unif inj_check match_kis rn_env tv_env cv_env tys1 tys2</td>
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<pre style="margin: 0;"> <span id="LC575" class="line" lang="haskell"> <span class="n" style="color: #333;">kis2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">typeKind</span> <span class="n" style="color: #333;">tys2</span></span>
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<pre style="margin: 0;"> <span id="LC576" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC577" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</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;">Outputable</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">UnifyResultM</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC533" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">SurelyApart</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"SurelyApart"</span></span>
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<pre style="margin: 0;">-<span id="LC534" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Unifiable</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Unifiable"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">-<span id="LC535" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MaybeApart</span> <span class="n" style="color: #333;"><span class="idiff left">x</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">text</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff right">"MaybeApart"</span></span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">+<span id="LC578" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="kt" style="color: #458; font-weight: 600;">SurelyApart</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"SurelyApart"</span></span>
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579
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<pre style="margin: 0;">+<span id="LC579" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Unifiable</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Unifiable"</span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">+<span id="LC580" class="line" lang="haskell"> <span class="n" style="color: #333;">ppr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MaybeApart</span> <span class="n" style="color: #333;"><span class="idiff left">r</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">text</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"MaybeApart"</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff"><+></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">ppr</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">r</span></span> <span class="o" style="font-weight: 600;"><+></span> <span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;"> <span id="LC581" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC582" 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="LC583" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -773,7 +818,7 @@ this, but we mustn't map a to anything else!)</td>
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<pre style="margin: 0;"> <span id="LC818" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We thus must parameterize the algorithm over whether it's being used</span></span>
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<pre style="margin: 0;"> <span id="LC819" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">for an injectivity check (refrain from looking at non-injective arguments</span></span>
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<pre style="margin: 0;"> <span id="LC820" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to type families) or not (do indeed look at those arguments). This is</span></span>
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<pre style="margin: 0;">-<span id="LC776" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">implemented by the u<span class="idiff left right">f_inj_tf field of Um</span>Env.</span></span>
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<pre style="margin: 0;">+<span id="LC821" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">implemented by the u<span class="idiff left right">m_inj_tf field of UM</span>Env.</span></span>
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<pre style="margin: 0;"> <span id="LC822" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC823" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(It's all a question of whether or not to include equation (7) from Fig. 2</span></span>
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<pre style="margin: 0;"> <span id="LC824" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of [ITF].)</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">@@ -994,7 +1039,7 @@ unify_ty env ty1 ty2 _kco</td>
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<pre style="margin: 0;"> <span id="LC1039" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1040" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">unify_tys</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">inj_tys1</span> <span class="n" style="color: #333;">inj_tys2</span></span>
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1041
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<pre style="margin: 0;"> <span id="LC1041" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">unless</span> <span class="p">(</span><span class="n" style="color: #333;">um_inj_tf</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span> <span class="c1" style="color: #998; font-style: italic;">-- See (end of) Note [Specification of unification]</span></span>
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<pre style="margin: 0;">-<span id="LC997" class="line" lang="haskell"> <span class="n" style="color: #333;">don'tBeSoSure</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">unify_tys</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">noninj_tys1</span> <span class="n" style="color: #333;">noninj_tys2</span> <span class="p">}</span></span>
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1042
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<pre style="margin: 0;">+<span id="LC1042" class="line" lang="haskell"> <span class="n" style="color: #333;">don'tBeSoSure</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">MARTypeFamily</span></span><span class="idiff right"> </span><span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">unify_tys</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">noninj_tys1</span> <span class="n" style="color: #333;">noninj_tys2</span> <span class="p">}</span></span>
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998
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1043
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<pre style="margin: 0;"> <span id="LC1043" class="line" lang="haskell"></span>
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999
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1044
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<pre style="margin: 0;"> <span id="LC1044" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">tc1</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mb_tc_app1</span></span>
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1000
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1045
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<pre style="margin: 0;"> <span id="LC1045" 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;">isGenerativeTyCon</span> <span class="n" style="color: #333;">tc1</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span><span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1047" 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">@@ -1002,7 +1047,7 @@ unify_ty env ty1 ty2 _kco</td>
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1002
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1047
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<pre style="margin: 0;"> <span id="LC1047" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- because the (F ty1) behaves like a variable</span></span>
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1003
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1048
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<pre style="margin: 0;"> <span id="LC1048" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: if unifying, we have already dealt</span></span>
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1004
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1049
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<pre style="margin: 0;"> <span id="LC1049" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- with the 'ty2 = variable' case</span></span>
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1005
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<pre style="margin: 0;">-<span id="LC1005" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">maybeApart</span></span>
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1050
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<pre style="margin: 0;">+<span id="LC1050" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">maybeApart</span><span class="idiff left"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">MARTypeFamily</span></span></span>
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1006
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1051
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<pre style="margin: 0;"> <span id="LC1051" class="line" lang="haskell"></span>
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1007
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1052
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<pre style="margin: 0;"> <span id="LC1052" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">tc2</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mb_tc_app2</span></span>
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1008
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1053
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<pre style="margin: 0;"> <span id="LC1053" 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;">isGenerativeTyCon</span> <span class="n" style="color: #333;">tc2</span> <span class="kt" style="color: #458; font-weight: 600;">Nominal</span><span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1055" 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">@@ -1010,7 +1055,7 @@ unify_ty env ty1 ty2 _kco</td>
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1010
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1055
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<pre style="margin: 0;"> <span id="LC1055" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- E.g. unify_ty [a] (F ty2) = MaybeApart, when unifying (only)</span></span>
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1011
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1056
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<pre style="margin: 0;"> <span id="LC1056" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- because the (F ty2) behaves like a variable</span></span>
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1012
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1057
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<pre style="margin: 0;"> <span id="LC1057" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: we have already dealt with the 'ty1 = variable' case</span></span>
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1013
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<pre style="margin: 0;">-<span id="LC1013" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">maybeApart</span></span>
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1058
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<pre style="margin: 0;">+<span id="LC1058" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">maybeApart</span><span class="idiff left"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">MARTypeFamily</span></span></span>
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1014
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1059
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<pre style="margin: 0;"> <span id="LC1059" class="line" lang="haskell"></span>
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1015
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1060
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<pre style="margin: 0;"> <span id="LC1060" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1016
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1061
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<pre style="margin: 0;"> <span id="LC1061" class="line" lang="haskell"> <span class="n" style="color: #333;">mb_tc_app1</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcSplitTyConApp_maybe</span> <span class="n" style="color: #333;">ty1</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">@@ -1120,7 +1165,8 @@ uVar env tv1 ty kco</td>
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1120
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1165
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<pre style="margin: 0;"> <span id="LC1165" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- this is because the range of the subst is the target</span></span>
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1121
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1166
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<pre style="margin: 0;"> <span id="LC1166" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- type, not the template type. So, just check for</span></span>
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1122
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1167
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<pre style="margin: 0;"> <span id="LC1167" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- normal type equality.</span></span>
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1123
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<pre style="margin: 0;">-<span id="LC1123" class="line" lang="haskell"> <span class="n" style="color: #333;">guard</span> <span class="p">((</span><span class="n" style="color: #333;">ty'</span> <span class="p">`</span><span class="n" style="color: #333;">mkCastTy</span><span class="p">`</span> <span class="n" style="color: #333;">kco</span><span class="p">)</span> <span class="p">`</span><span class="n" style="color: #333;">eqType</span><span class="p">`</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span></span>
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1168
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<pre style="margin: 0;">+<span id="LC1168" class="line" lang="haskell"> <span class="n" style="color: #333;">unless</span> <span class="p">((</span><span class="n" style="color: #333;">ty'</span> <span class="p">`</span><span class="n" style="color: #333;">mkCastTy</span><span class="p">`</span> <span class="n" style="color: #333;">kco</span><span class="p">)</span> <span class="p">`</span><span class="n" style="color: #333;">eqType</span><span class="p">`</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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1169
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<pre style="margin: 0;">+<span id="LC1169" class="line" lang="haskell"> <span class="n" style="color: #333;">surelyApart</span></span>
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1124
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1170
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<pre style="margin: 0;"> <span id="LC1170" 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="n" style="color: #333;">uUnrefined</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">tv1'</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">ty</span> <span class="n" style="color: #333;">kco</span> <span class="p">}</span> <span class="c1" style="color: #998; font-style: italic;">-- No, continue</span></span>
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1125
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1171
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<pre style="margin: 0;"> <span id="LC1171" class="line" lang="haskell"></span>
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1126
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1172
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<pre style="margin: 0;"> <span id="LC1172" class="line" lang="haskell"><span class="n" style="color: #333;">uUnrefined</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">UMEnv</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1236" 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">@@ -1190,7 +1236,7 @@ bindTv env tv1 ty2</td>
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1190
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1236
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<pre style="margin: 0;"> <span id="LC1236" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Make sure you include 'kco' (which ty2 does) #14846</span></span>
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1191
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1237
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<pre style="margin: 0;"> <span id="LC1237" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">occurs</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">occursCheck</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">tv1</span> <span class="n" style="color: #333;">free_tvs2</span></span>
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1192
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1238
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<pre style="margin: 0;"> <span id="LC1238" class="line" lang="haskell"></span>
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1193
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<pre style="margin: 0;">-<span id="LC1193" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">occurs</span> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">maybeApart</span></span>
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1239
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<pre style="margin: 0;">+<span id="LC1239" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">occurs</span> <span class="kr" style="font-weight: 600;">then</span> <span class="n" style="color: #333;">maybeApart</span><span class="idiff left"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">MARInfinite</span></span></span>
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1194
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1240
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<pre style="margin: 0;"> <span id="LC1240" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">extendTvEnv</span> <span class="n" style="color: #333;">tv1</span> <span class="n" style="color: #333;">ty2</span> <span class="p">}</span></span>
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1195
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1241
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<pre style="margin: 0;"> <span id="LC1241" class="line" lang="haskell"></span>
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1196
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1242
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<pre style="margin: 0;"> <span id="LC1242" class="line" lang="haskell"><span class="n" style="color: #333;">occursCheck</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">UMEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">VarSet</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">UM</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1320" 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">@@ -1274,15 +1320,6 @@ instance Monad UM where</td>
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1274
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1320
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<pre style="margin: 0;"> <span id="LC1320" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">state'</span><span class="p">,</span> <span class="n" style="color: #333;">v</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">unUM</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">state</span></span>
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1275
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1321
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<pre style="margin: 0;"> <span id="LC1321" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">unUM</span> <span class="p">(</span><span class="n" style="color: #333;">k</span> <span class="n" style="color: #333;">v</span><span class="p">)</span> <span class="n" style="color: #333;">state'</span> <span class="p">})</span></span>
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1322
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<pre style="margin: 0;"> <span id="LC1322" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1277" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- need this instance because of a use of 'guard' above</span></span>
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1278
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<pre style="margin: 0;">-<span id="LC1278" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Alternative</span> <span class="kt" style="color: #458; font-weight: 600;">UM</span> <span class="kr" style="font-weight: 600;">where</span></span>
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1279
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<pre style="margin: 0;">-<span id="LC1279" class="line" lang="haskell"> <span class="n" style="color: #333;">empty</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">UM</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</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;">Control</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">Applicative</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">empty</span><span class="p">)</span></span>
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1280
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<pre style="margin: 0;">-<span id="LC1280" class="line" lang="haskell"> <span class="n" style="color: #333;">m1</span> <span class="o" style="font-weight: 600;"><|></span> <span class="n" style="color: #333;">m2</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">UM</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">state</span> <span class="o" style="font-weight: 600;">-></span></span>
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1281
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<pre style="margin: 0;">-<span id="LC1281" class="line" lang="haskell"> <span class="n" style="color: #333;">unUM</span> <span class="n" style="color: #333;">m1</span> <span class="n" style="color: #333;">state</span> <span class="o" style="font-weight: 600;"><|></span></span>
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1282
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<pre style="margin: 0;">-<span id="LC1282" class="line" lang="haskell"> <span class="n" style="color: #333;">unUM</span> <span class="n" style="color: #333;">m2</span> <span class="n" style="color: #333;">state</span><span class="p">)</span></span>
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1283
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<pre style="margin: 0;">-<span id="LC1283" class="line" lang="haskell"></span>
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1284
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<pre style="margin: 0;">-<span id="LC1284" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">MonadPlus</span> <span class="kt" style="color: #458; font-weight: 600;">UM</span></span>
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1285
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<pre style="margin: 0;">-<span id="LC1285" class="line" lang="haskell"></span>
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1286
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1323
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<pre style="margin: 0;"> <span id="LC1323" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">MonadFail</span> <span class="kt" style="color: #458; font-weight: 600;">UM</span> <span class="kr" style="font-weight: 600;">where</span></span>
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1287
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1324
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<pre style="margin: 0;"> <span id="LC1324" class="line" lang="haskell"> <span class="n" style="color: #333;">fail</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;">UM</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</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;">SurelyApart</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- failed pattern match</span></span>
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1325
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<pre style="margin: 0;"> <span id="LC1325" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1291" 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="1328" 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">@@ -1291,9 +1328,9 @@ initUM :: TvSubstEnv -- subst to extend</td>
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<pre style="margin: 0;"> <span id="LC1328" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">UM</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;">UnifyResultM</span> <span class="n" style="color: #333;">a</span></span>
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1292
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<pre style="margin: 0;"> <span id="LC1329" class="line" lang="haskell"><span class="n" style="color: #333;">initUM</span> <span class="n" style="color: #333;">subst_env</span> <span class="n" style="color: #333;">cv_subst_env</span> <span class="n" style="color: #333;">um</span></span>
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1293
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1330
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<pre style="margin: 0;"> <span id="LC1330" 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;">unUM</span> <span class="n" style="color: #333;">um</span> <span class="n" style="color: #333;">state</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1294
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<pre style="margin: 0;">-<span id="LC1294" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Unifiable</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">subst</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Unifiable</span> <span class="n" style="color: #333;">subst</span></span>
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1295
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<pre style="margin: 0;">-<span id="LC1295" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MaybeApart</span> <span class="p"><span class="idiff left">(</span></span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">subst</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">MaybeApart</span></span> <span class="n" style="color: #333;">subst</span></span>
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1296
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<pre style="margin: 0;">-<span id="LC1296" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SurelyApart</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SurelyApart</span></span>
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<pre style="margin: 0;">+<span id="LC1331" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Unifiable</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">subst</span><span class="p">)</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Unifiable</span> <span class="n" style="color: #333;">subst</span></span>
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1332
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<pre style="margin: 0;">+<span id="LC1332" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MaybeApart</span> <span class="n" style="color: #333;"><span class="idiff left">r</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">subst</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">MaybeApart</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">r</span></span> <span class="n" style="color: #333;">subst</span></span>
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<pre style="margin: 0;">+<span id="LC1333" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SurelyApart</span> <span class="idiff left right"> </span><span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">SurelyApart</span></span>
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1297
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1334
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<pre style="margin: 0;"> <span id="LC1334" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1298
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1335
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<pre style="margin: 0;"> <span id="LC1335" class="line" lang="haskell"> <span class="n" style="color: #333;">state</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">UMState</span> <span class="p">{</span> <span class="n" style="color: #333;">um_tv_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">subst_env</span></span>
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1299
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1336
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<pre style="margin: 0;"> <span id="LC1336" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">um_cv_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cv_subst_env</span> <span class="p">}</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1370" 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">@@ -1333,9 +1370,7 @@ checkRnEnv :: UMEnv -> VarSet -> UM ()</td>
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1333
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1370
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<pre style="margin: 0;"> <span id="LC1370" class="line" lang="haskell"><span class="n" style="color: #333;">checkRnEnv</span> <span class="n" style="color: #333;">env</span> <span class="n" style="color: #333;">varset</span></span>
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1371
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<pre style="margin: 0;"> <span id="LC1371" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isEmptyVarSet</span> <span class="n" style="color: #333;">skol_vars</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1372
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<pre style="margin: 0;"> <span id="LC1372" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">varset</span> <span class="p">`</span><span class="n" style="color: #333;">disjointVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">skol_vars</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1336
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<pre style="margin: 0;">-<span id="LC1336" 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="n" style="color: #333;">maybeApart</span></span>
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<pre style="margin: 0;">-<span id="LC1337" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ToDo: why MaybeApart?</span></span>
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1338
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<pre style="margin: 0;">-<span id="LC1338" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- I think SurelyApart would be right</span></span>
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<pre style="margin: 0;">+<span id="LC1373" 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="n" style="color: #333;">surelyApart</span></span>
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1339
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<pre style="margin: 0;"> <span id="LC1374" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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1340
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<pre style="margin: 0;"> <span id="LC1375" class="line" lang="haskell"> <span class="n" style="color: #333;">skol_vars</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">um_skols</span> <span class="n" style="color: #333;">env</span></span>
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1341
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1376
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<pre style="margin: 0;"> <span id="LC1376" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB: That isEmptyVarSet guard is a critical optimization;</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">@@ -1343,10 +1378,10 @@ checkRnEnv env varset</td>
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1343
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1378
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<pre style="margin: 0;"> <span id="LC1378" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the type, often saving quite a bit of allocation.</span></span>
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1379
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<pre style="margin: 0;"> <span id="LC1379" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1380" class="line" lang="haskell"><span class="cd">-- | Converts any SurelyApart to a MaybeApart</span></span>
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1346
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<pre style="margin: 0;">-<span id="LC1346" class="line" lang="haskell"><span class="n" style="color: #333;">don'tBeSoSure</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">UM</span> <span class="nb" style="color: #0086b3;">()</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">UM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1347
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<pre style="margin: 0;">-<span id="LC1347" class="line" lang="haskell"><span class="n" style="color: #333;">don'tBeSoSure</span> <span class="n" style="color: #333;">um</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">UM</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">state</span> <span class="o" style="font-weight: 600;">-></span></span>
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1381
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<pre style="margin: 0;">+<span id="LC1381" class="line" lang="haskell"><span class="n" style="color: #333;">don'tBeSoSure</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">MaybeApartReason</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff right"> </span><span class="kt" style="color: #458; font-weight: 600;">UM</span> <span class="nb" style="color: #0086b3;">()</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">UM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1382
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<pre style="margin: 0;">+<span id="LC1382" class="line" lang="haskell"><span class="n" style="color: #333;">don'tBeSoSure</span> <span class="n" style="color: #333;"><span class="idiff left">r</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">um</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">UM</span> <span class="o" style="font-weight: 600;">$</span> <span class="nf" style="color: #900; font-weight: 600;">\</span> <span class="n" style="color: #333;">state</span> <span class="o" style="font-weight: 600;">-></span></span>
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1348
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1383
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<pre style="margin: 0;"> <span id="LC1383" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">unUM</span> <span class="n" style="color: #333;">um</span> <span class="n" style="color: #333;">state</span> <span class="kr" style="font-weight: 600;">of</span></span>
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1349
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<pre style="margin: 0;">-<span id="LC1349" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SurelyApart</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeApart</span> <span class="p">(</span><span class="n" style="color: #333;">state</span><span class="p">,</span> <span class="nb" style="color: #0086b3;">()</span><span class="p">)</span></span>
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1384
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<pre style="margin: 0;">+<span id="LC1384" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">SurelyApart</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">MaybeApart</span> <span class="n" style="color: #333;"><span class="idiff left">r</span></span><span class="idiff right"> </span><span class="p">(</span><span class="n" style="color: #333;">state</span><span class="p">,</span> <span class="nb" style="color: #0086b3;">()</span><span class="p">)</span></span>
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1350
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1385
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<pre style="margin: 0;"> <span id="LC1385" class="line" lang="haskell"> <span class="n" style="color: #333;">other</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">other</span></span>
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1351
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1386
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<pre style="margin: 0;"> <span id="LC1386" class="line" lang="haskell"></span>
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1352
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1387
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<pre style="margin: 0;"> <span id="LC1387" class="line" lang="haskell"><span class="n" style="color: #333;">umRnOccL</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">UMEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyVar</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TyVar</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1358" 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="1393" 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">@@ -1358,8 +1393,8 @@ umRnOccR env v = rnOccR (um_rn_env env) v</td>
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1393
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<pre style="margin: 0;"> <span id="LC1393" class="line" lang="haskell"><span class="n" style="color: #333;">umSwapRn</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">UMEnv</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">UMEnv</span></span>
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1359
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1394
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<pre style="margin: 0;"> <span id="LC1394" class="line" lang="haskell"><span class="n" style="color: #333;">umSwapRn</span> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">env</span> <span class="p">{</span> <span class="n" style="color: #333;">um_rn_env</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">rnSwap</span> <span class="p">(</span><span class="n" style="color: #333;">um_rn_env</span> <span class="n" style="color: #333;">env</span><span class="p">)</span> <span class="p">}</span></span>
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1360
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1395
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<pre style="margin: 0;"> <span id="LC1395" class="line" lang="haskell"></span>
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1361
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<pre style="margin: 0;">-<span id="LC1361" class="line" lang="haskell"><span class="n" style="color: #333;">maybeApart</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">UM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1362
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<pre style="margin: 0;">-<span id="LC1362" class="line" lang="haskell"><span class="n" style="color: #333;">maybeApart</span> <span class="o" style="font-weight: 600;"><span class="idiff left">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">UM</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">\</span></span><span class="n" style="color: #333;"><span class="idiff">state</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">MaybeApart</span></span> <span class="p">(</span><span class="n" style="color: #333;">state</span><span class="p">,</span> <span class="nb" style="color: #0086b3;">()</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC1396" class="line" lang="haskell"><span class="n" style="color: #333;">maybeApart</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">MaybeApartReason</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff right"> </span><span class="kt" style="color: #458; font-weight: 600;">UM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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1397
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<pre style="margin: 0;">+<span id="LC1397" class="line" lang="haskell"><span class="n" style="color: #333;">maybeApart</span> <span class="n" style="color: #333;"><span class="idiff left">r</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">UM</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">\</span></span><span class="n" style="color: #333;"><span class="idiff">state</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">MaybeApart</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">r</span></span> <span class="p">(</span><span class="n" style="color: #333;">state</span><span class="p">,</span> <span class="nb" style="color: #0086b3;">()</span><span class="p">))</span></span>
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1398
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<pre style="margin: 0;"> <span id="LC1398" class="line" lang="haskell"></span>
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1399
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<pre style="margin: 0;"> <span id="LC1399" class="line" lang="haskell"><span class="n" style="color: #333;">surelyApart</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">UM</span> <span class="n" style="color: #333;">a</span></span>
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1365
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<pre style="margin: 0;"> <span id="LC1400" class="line" lang="haskell"><span class="n" style="color: #333;">surelyApart</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">UM</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</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;">SurelyApart</span><span class="p">)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a65abc31007f57cff07a942eead7684c9eb6b857#3b4a5529eef512d0a34907f104e2514734720f9a"><strong>testsuite/tests/typecheck/should_compile/T19044.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE FlexibleInstances #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE MultiParamTypeClasses #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T19044</span> <span class="kr" style="font-weight: 600;">where</span></span>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span> <span class="kr" style="font-weight: 600;">where</span></span>
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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span></span>
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7
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"></span>
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8
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">a</span> <span class="kr" style="font-weight: 600;">where</span></span>
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9
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"> <span class="n" style="color: #333;">m</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">id</span></span>
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10
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="n" style="color: #333;">a</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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12
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"> <span class="n" style="color: #333;">m</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;">Nothing</span></span>
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13
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"></span>
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14
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">a</span></span>
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15
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><span class="n" style="color: #333;">f</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">g</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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17
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"> <span class="n" style="color: #333;">g</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">h</span> <span class="p">(</span><span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="n" style="color: #333;">x</span></span>
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18
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"><span class="n" style="color: #333;">h</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">a</span></span>
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20
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"><span class="n" style="color: #333;">h</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">const</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a65abc31007f57cff07a942eead7684c9eb6b857#6ec63384cb80f7a07ea81472ce31bc3d4a6969e7"><strong>testsuite/tests/typecheck/should_compile/T19052.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE AllowAmbiguousTypes, DataKinds, FlexibleInstances, KindSignatures, MultiParamTypeClasses, ScopedTypeVariables, TypeApplications, TypeFamilies, TypeOperators, UndecidableInstances #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">Overlap</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Kind</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">Sub</span> <span class="p">(</span><span class="n" style="color: #333;">xs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">])</span> <span class="p">(</span><span class="n" style="color: #333;">ys</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">])</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"> <span class="n" style="color: #333;">subIndex</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="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="cp" style="color: #999; font-weight: 600;">{-# OVERLAPPING #-}</span> <span class="kt" style="color: #458; font-weight: 600;">Sub</span> <span class="n" style="color: #333;">xs</span> <span class="n" style="color: #333;">xs</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"> <span class="n" style="color: #333;">subIndex</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">0</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="p">(</span><span class="n" style="color: #333;">ys</span> <span class="o" style="font-weight: 600;">~</span> <span class="p">(</span><span class="n" style="color: #333;">y</span> <span class="n" style="color: #333;">'</span><span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">ys'</span><span class="p">),</span> <span class="kt" style="color: #458; font-weight: 600;">Sub</span> <span class="n" style="color: #333;">xs</span> <span class="n" style="color: #333;">ys'</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Sub</span> <span class="n" style="color: #333;">xs</span> <span class="n" style="color: #333;">ys</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"> <span class="n" style="color: #333;">subIndex</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">subIndex</span> <span class="o" style="font-weight: 600;">@</span><span class="n" style="color: #333;">xs</span> <span class="o" style="font-weight: 600;">@</span><span class="n" style="color: #333;">ys'</span> <span class="o" style="font-weight: 600;">+</span> <span class="mi" style="color: #099;">1</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="n" style="color: #333;">subIndex1</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="p">(</span><span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">xs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</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="LC14" class="line" lang="haskell"><span class="n" style="color: #333;">subIndex1</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">subIndex</span> <span class="o" style="font-weight: 600;">@</span><span class="n" style="color: #333;">xs</span> <span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">'</span><span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">xs</span><span class="p">)</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a65abc31007f57cff07a942eead7684c9eb6b857#34fe7bf0e6fbf60effb28393399ba68666593909"><strong>testsuite/tests/typecheck/should_compile/all.T</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -734,6 +734,8 @@ test('T17186', normal, compile, [''])</td>
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<pre style="margin: 0;"> <span id="LC734" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">CbvOverlap</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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735
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735
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<pre style="margin: 0;"> <span id="LC735" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">InstanceGivenOverlap</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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736
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736
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<pre style="margin: 0;"> <span id="LC736" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">InstanceGivenOverlap2</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">+<span id="LC737" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T19044</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">+<span id="LC738" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T19052</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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737
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739
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<pre style="margin: 0;"> <span id="LC739" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">LocalGivenEqs</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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738
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740
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<pre style="margin: 0;"> <span id="LC740" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">LocalGivenEqs2</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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739
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741
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<pre style="margin: 0;"> <span id="LC741" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18891</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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