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<h3>

Richard Eisenberg pushed to branch wip/cfuneqcan-refactor

at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>

</h3>

<h4>

Commits:

</h4>

<ul>

<li>

<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/05b06a8d3b847f99a2073a78c046ae54f21f2bae">05b06a8d</a></strong>

<div>

<span>by Richard Eisenberg</span>

<i>at 2020-11-04T14:41:37-05:00</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update Note [TyVar/TyVar orientation]

</pre>

</li>

<li>

<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9d122639ed288a794ffa20dae3ba9721f319c004">9d122639</a></strong>

<div>

<span>by Richard Eisenberg</span>

<i>at 2020-11-04T14:51:54-05:00</i>

</div>

<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Actually add tests

</pre>

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<h4>4 changed files:</h4>

<ul>

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<a href="#74295edeac870ee7f2f3484ebaffab5c948b735a">

compiler/GHC/Tc/Utils/Unify.hs

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<a href="#784c3f9a7063f3e55d1546b829a6d6a9649a04c1">

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+

testsuite/tests/typecheck/should_compile/CbvOverlap.hs

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<a href="#40a39ec3a9aed510de86fb1681984728ca7e17b9">

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+

testsuite/tests/typecheck/should_compile/InstanceGivenOverlap.hs

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<a href="#eff47a2f183e7defeb83bf3ea4c8af95d6c7f1d0">

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testsuite/tests/typecheck/should_compile/InstanceGivenOverlap2.hs

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<h4>Changes:</h4>

<li id="74295edeac870ee7f2f3484ebaffab5c948b735a">

<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/ebfebd6fd6e6407bc0c8ad81d31616b76fc8ce3d...9d122639ed288a794ffa20dae3ba9721f319c004#74295edeac870ee7f2f3484ebaffab5c948b735a"><strong>compiler/GHC/Tc/Utils/Unify.hs</strong></a>

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<pre style="margin: 0;"> <span id="LC1502" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC1503" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- Note [TyVar/TyVar orientation]</span></span>

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<td class="diff-line-num old_line" data-linenumber="1504" 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">

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<pre style="margin: 0;"> <span id="LC1504" 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="LC1505" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">"RAE": Update</span></span>

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<pre style="margin: 0;">-<span id="LC1506" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC1505" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Given (a ~ b), should we orient the CEqCan as (a~b) or (b~a)?</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC1506" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This is a surprisingly tricky question! This is invariant (TyEq:TV).</span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC1507" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">-<span id="LC1510" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The question is answered by swapOverTyVars, which is use</span></span>

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<pre style="margin: 0;">+<span id="LC1508" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The question is answered by swapOverTyVars, which is use<span class="idiff left right">d</span></span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC1509" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  - in the eager unifier, in GHC.Tc.Utils.Unify.uUnfilledVar1</span></span>

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<pre style="margin: 0;">-<span id="LC1512" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  - in the constraint solver, in GHC.Tc.Solver.Canonical.canEq<span class="idiff left right">TyVarHomo</span></span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1513" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC1510" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  - in the constraint solver, in GHC.Tc.Solver.Canonical.canEq<span class="idiff left right">CanLHS2</span></span></span>

</pre>

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<pre style="margin: 0;"> <span id="LC1511" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC1512" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">First note: only swap if you have to!</span></span>

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<pre style="margin: 0;"> <span id="LC1513" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   See Note [Avoid unnecessary swaps]</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">@@ -1529,15 +1527,23 @@ So we look for a positive reason to swap, using a three-step test:</td>

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<pre style="margin: 0;"> <span id="LC1527" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">        looks for meta tyvars on the left</span></span>

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<pre style="margin: 0;"> <span id="LC1528" class="line" lang="haskell"></span>

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<pre style="margin: 0;"> <span id="LC1529" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  Tie-breaking rules for MetaTvs:</span></span>

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<pre style="margin: 0;">-<span id="LC1532" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  - TauTv = 3: if we have  tyv_tv ~ tau_tv,</span></span>

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<pre style="margin: 0;">-<span id="LC1533" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">       put tau_tv on the left because there are fewer</span></span>

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<pre style="margin: 0;">-<span id="LC1534" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">       restrictions on updating TauTvs.  Or to say it another</span></span>

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<pre style="margin: 0;">-<span id="LC1535" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">       way, then we won't lose the TyVarTv flag</span></span>

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<pre style="margin: 0;">+<span id="LC1530" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  - CycleBreakerTv: This is essentially a stand-in for another type;</span></span>

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<pre style="margin: 0;">+<span id="LC1531" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">       it's untouchable and should have the same priority as a skolem: 0.</span></span>

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<pre style="margin: 0;">+<span id="LC1532" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC1533" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  - TyVarTv: These can unify only with another tyvar, but we can't unify</span></span>

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<pre style="margin: 0;">+<span id="LC1534" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">       a TyVarTv with a TauTv, because then the TyVarTv could (transitively)</span></span>

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<pre style="margin: 0;">+<span id="LC1535" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">       get a non-tyvar type. So give these a low priority: 1.</span></span>

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<pre style="margin: 0;">+<span id="LC1536" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC1537" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  - TauTv: This is the common case; we want these on the left so that they</span></span>

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<pre style="margin: 0;">+<span id="LC1538" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">       can be written to: 2.</span></span>

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<pre style="margin: 0;"> <span id="LC1539" class="line" lang="haskell"></span>

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<pre style="margin: 0;">-<span id="LC1537" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  - TyVarTv = 2: TyVarTvs come next</span></span>

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<pre style="margin: 0;">+<span id="LC1540" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  - RuntimeUnkTv: These aren't really meta-variables used in type inference,</span></span>

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<td class="diff-line-num new new_line" data-linenumber="1541" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1541

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<pre style="margin: 0;">+<span id="LC1541" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">       but just a convenience in the implementation of the GHCi debugger.</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="1542" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1542

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<pre style="margin: 0;">+<span id="LC1542" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">       Eagerly write to these: 3. See Note [RuntimeUnkTv] in</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="1538" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<td class="diff-line-num new new_line" data-linenumber="1543" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

1543

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<pre style="margin: 0;">+<span id="LC1543" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">       GHC.Runtime.Heap.Inspect.</span></span>

</pre>

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1538

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1544

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<pre style="margin: 0;"> <span id="LC1544" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num old_line" data-linenumber="1539" 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">

1539

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<td class="diff-line-num new_line" data-linenumber="1545" 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">

1545

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<pre style="margin: 0;"> <span id="LC1545" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Names. If the level and priority comparisons are all</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="1540" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

1540

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<td class="diff-line-num new_line old" data-linenumber="1546" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC1540" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  equal, try to eliminate a TyVar<span class="idiff left right">s</span> with a System Name in</span></span>

</pre>

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1546

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<pre style="margin: 0;">+<span id="LC1546" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  equal, try to eliminate a TyVar with a System Name in</span></span>

</pre>

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1541

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<td class="diff-line-num new_line" data-linenumber="1547" 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">

1547

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<pre style="margin: 0;"> <span id="LC1547" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  favour of ones with a Name derived from a user type signature</span></span>

</pre>

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1542

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1548

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<pre style="margin: 0;"> <span id="LC1548" class="line" lang="haskell"></span>

</pre>

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1543

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1549

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<pre style="margin: 0;"> <span id="LC1549" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">* Age.  At one point in the past we tried to break any remaining</span></span>

</pre>

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<br>

</li>

<li id="784c3f9a7063f3e55d1546b829a6d6a9649a04c1">

<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/ebfebd6fd6e6407bc0c8ad81d31616b76fc8ce3d...9d122639ed288a794ffa20dae3ba9721f319c004#784c3f9a7063f3e55d1546b829a6d6a9649a04c1"><strong>testsuite/tests/typecheck/should_compile/CbvOverlap.hs</strong></a>

<hr>

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1

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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 TypeFamilies, FlexibleInstances, FlexibleContexts #-}</span></span>

</pre>

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2

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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"></span>

</pre>

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3

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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;">CbvOverlap</span> <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

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4

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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"></span>

</pre>

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5

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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This is concerned with Note [Type variable cycles in Givens] and class lookup</span></span>

</pre>

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6

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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"></span>

</pre>

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7

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<pre style="margin: 0;">+<span id="LC7" 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="kr" style="font-weight: 600;">where</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="0" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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8

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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell">  <span class="n" style="color: #333;">meth</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="nb" style="color: #0086b3;">()</span></span>

</pre>

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<td class="diff-line-num new old_line" data-linenumber="0" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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9

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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"></span>

</pre>

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10

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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="kt" style="color: #458; font-weight: 600;">C</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="kr" style="font-weight: 600;">where</span></span>

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11

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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell">  <span class="n" style="color: #333;">meth</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">()</span></span>

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12

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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"></span>

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13

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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">F</span> <span class="n" style="color: #333;">a</span></span>

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14

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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"></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;">foo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">C</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">F</span> <span class="n" style="color: #333;">a</span><span class="p">)</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;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span></span>

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16

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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"><span class="n" style="color: #333;">foo</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">meth</span> <span class="n" style="color: #333;">n</span></span></pre>

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<br>

</li>

<li id="40a39ec3a9aed510de86fb1681984728ca7e17b9">

<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/ebfebd6fd6e6407bc0c8ad81d31616b76fc8ce3d...9d122639ed288a794ffa20dae3ba9721f319c004#40a39ec3a9aed510de86fb1681984728ca7e17b9"><strong>testsuite/tests/typecheck/should_compile/InstanceGivenOverlap.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 ScopedTypeVariables, FlexibleInstances, MultiParamTypeClasses,</span></span>

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2

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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">             TypeFamilies, FlexibleContexts, AllowAmbiguousTypes #-}</span></span>

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3

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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;">module</span> <span class="nn" style="color: #555;">InstanceGivenOverlap</span> <span class="kr" style="font-weight: 600;">where</span></span>

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5

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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="c1" style="color: #998; font-style: italic;">-- See Note [Instance and Given overlap] in GHC.Tc.Solver.Interact.</span></span>

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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This tests the Note when the Wanted contains a type family.</span></span>

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8

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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"></span>

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9

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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">P</span> <span class="n" style="color: #333;">a</span></span>

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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">Q</span> <span class="n" style="color: #333;">a</span></span>

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11

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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">R</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span></span>

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12

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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"></span>

</pre>

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13

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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">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;">Q</span> <span class="p">[</span><span class="n" style="color: #333;">x</span><span class="p">]</span></span>

</pre>

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14

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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="p">(</span><span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">~</span> <span class="n" style="color: #333;">y</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">R</span> <span class="n" style="color: #333;">y</span> <span class="p">[</span><span class="n" style="color: #333;">x</span><span class="p">]</span></span>

</pre>

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15

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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"></span>

</pre>

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16

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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">F</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>

</pre>

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17

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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell">  <span class="kt" style="color: #458; font-weight: 600;">F</span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</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>

</pre>

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18

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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"></span>

</pre>

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19

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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"><span class="n" style="color: #333;">wob</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</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;">Q</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">F</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">R</span> <span class="n" style="color: #333;">b</span> <span class="n" style="color: #333;">a</span><span class="p">)</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;">Int</span></span>

</pre>

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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;">wob</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">undefined</span></span>

</pre>

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21

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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"></span>

</pre>

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22

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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"><span class="n" style="color: #333;">g</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">Q</span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span> <span class="o" style="font-weight: 600;">=></span> <span class="p">[</span><span class="n" style="color: #333;">a</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>

</pre>

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23

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<pre style="margin: 0;">+<span id="LC23" 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;">wob</span> <span class="n" style="color: #333;">x</span></span></pre>

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<br>

</li>

<li id="eff47a2f183e7defeb83bf3ea4c8af95d6c7f1d0">

<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/ebfebd6fd6e6407bc0c8ad81d31616b76fc8ce3d...9d122639ed288a794ffa20dae3ba9721f319c004#eff47a2f183e7defeb83bf3ea4c8af95d6c7f1d0"><strong>testsuite/tests/typecheck/should_compile/InstanceGivenOverlap2.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 ScopedTypeVariables, AllowAmbiguousTypes, TypeApplications,</span></span>

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2

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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">             TypeFamilies, PolyKinds, DataKinds, FlexibleInstances,</span></span>

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3

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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">             MultiParamTypeClasses, FlexibleContexts, PartialTypeSignatures #-}</span></span>

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4

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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# OPTIONS_GHC -Wno-partial-type-signatures #-}</span></span>

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5

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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"></span>

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6

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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">InstanceGivenOverlap2</span> <span class="kr" style="font-weight: 600;">where</span></span>

</pre>

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7

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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"></span>

</pre>

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8

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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Proxy</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="9" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

9

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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"></span>

</pre>

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10

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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">P</span> <span class="n" style="color: #333;">a</span></span>

</pre>

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11

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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">Q</span> <span class="n" style="color: #333;">a</span></span>

</pre>

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12

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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">R</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span></span>

</pre>

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13

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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"></span>

</pre>

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14

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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">Tagged</span> <span class="p">(</span><span class="n" style="color: #333;">t</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">k</span><span class="p">)</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Tagged</span> <span class="n" style="color: #333;">a</span></span>

</pre>

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15

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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">F</span> <span class="n" style="color: #333;">a</span></span>

</pre>

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17

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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">F</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Tagged</span> <span class="o" style="font-weight: 600;">@</span><span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="n" style="color: #333;">t</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="18" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

18

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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">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;">Q</span> <span class="p">[</span><span class="n" style="color: #333;">x</span><span class="p">]</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="p">(</span><span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">~</span> <span class="n" style="color: #333;">y</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">R</span> <span class="n" style="color: #333;">y</span> <span class="p">[</span><span class="n" style="color: #333;">x</span><span class="p">]</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="21" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"><span class="n" style="color: #333;">wob</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</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;">Q</span> <span class="p">[</span><span class="n" style="color: #333;">b</span><span class="p">],</span> <span class="kt" style="color: #458; font-weight: 600;">R</span> <span class="n" style="color: #333;">b</span> <span class="n" style="color: #333;">a</span><span class="p">)</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;">Int</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"><span class="n" style="color: #333;">wob</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">undefined</span></span>

</pre>

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24

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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"><span class="n" style="color: #333;">it'sABoolNow</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;">t</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</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>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="26" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

26

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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"><span class="n" style="color: #333;">it'sABoolNow</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">undefined</span></span>

</pre>

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27

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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="kt" style="color: #458; font-weight: 600;">HasBoolKind</span> <span class="n" style="color: #333;">t</span></span>

</pre>

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29

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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="n" style="color: #333;">k</span> <span class="o" style="font-weight: 600;">~</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">HasBoolKind</span> <span class="p">(</span><span class="n" style="color: #333;">t</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">k</span><span class="p">)</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"><span class="n" style="color: #333;">it'sABoolLater</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">t</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">HasBoolKind</span> <span class="n" style="color: #333;">t</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="32" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"><span class="n" style="color: #333;">it'sABoolLater</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">undefined</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="33" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC33" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC34" class="line" lang="haskell"><span class="n" style="color: #333;">g</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">t</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;">Q</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">F</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Tagged</span> <span class="n" style="color: #333;">t</span> <span class="n" style="color: #333;">a</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Proxy</span> <span class="n" style="color: #333;">t</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">_</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="35" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC35" class="line" lang="haskell"><span class="n" style="color: #333;">g</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">it'sABoolNow</span> <span class="o" style="font-weight: 600;">@</span><span class="n" style="color: #333;">t</span> <span class="o" style="font-weight: 600;">+</span> <span class="n" style="color: #333;">wob</span> <span class="n" style="color: #333;">x</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="36" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC36" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC37" class="line" lang="haskell"><span class="n" style="color: #333;">g2</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">t</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;">Q</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">F</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Tagged</span> <span class="n" style="color: #333;">t</span> <span class="n" style="color: #333;">a</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Proxy</span> <span class="n" style="color: #333;">t</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">_</span></span>

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<td class="diff-line-num new new_line" data-linenumber="38" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC38" class="line" lang="haskell"><span class="n" style="color: #333;">g2</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wob</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">+</span> <span class="n" style="color: #333;">it'sABoolNow</span> <span class="o" style="font-weight: 600;">@</span><span class="n" style="color: #333;">t</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="39" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC39" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC40" class="line" lang="haskell"><span class="n" style="color: #333;">g3</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">t</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;">Q</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">F</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Tagged</span> <span class="n" style="color: #333;">t</span> <span class="n" style="color: #333;">a</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Proxy</span> <span class="n" style="color: #333;">t</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">_</span></span>

</pre>

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41

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<pre style="margin: 0;">+<span id="LC41" class="line" lang="haskell"><span class="n" style="color: #333;">g3</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">it'sABoolLater</span> <span class="o" style="font-weight: 600;">@</span><span class="n" style="color: #333;">t</span> <span class="o" style="font-weight: 600;">+</span> <span class="n" style="color: #333;">wob</span> <span class="n" style="color: #333;">x</span></span>

</pre>

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42

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<pre style="margin: 0;">+<span id="LC42" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC43" class="line" lang="haskell"><span class="n" style="color: #333;">g4</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">t</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;">Q</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">F</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Tagged</span> <span class="n" style="color: #333;">t</span> <span class="n" style="color: #333;">a</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Proxy</span> <span class="n" style="color: #333;">t</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">_</span></span>

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44

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<pre style="margin: 0;">+<span id="LC44" class="line" lang="haskell"><span class="n" style="color: #333;">g4</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">wob</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">+</span> <span class="n" style="color: #333;">it'sABoolLater</span> <span class="o" style="font-weight: 600;">@</span><span class="n" style="color: #333;">t</span></span></pre>

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